From shuker at bgu.ac.il Sun Jan 1 11:55:13 2006 From: shuker at bgu.ac.il (shuker@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-17 Lasers Seminar Message-ID: <200601010955.LAA74775418@tzin.bgu.ac.il> Lasers Seminar DATE: 17-01-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: The Role Of Electrooptics In The New Battlefield SPEAKER: Dr. Gabby Sarusi, Chief Scientist and V.P. Business/Technology Development Elop - Electrooptic Systems, Rehovot Israel ABSTRACT/COMMENTS: It is evident that the battlefield is changing toward a more low intensity and asymmetric conflicts, counter terrorism and urban terrain warfare. Such changes should have a major influence related to the way we counter the threats. Effective intelligence gathering is becoming one of the most significant advantages that countries with access to high technology should rely on. Among all kinds of intelligence gathering, the imaging intelligence (IMINT) is one of the most important since it can provide with the most accurate information of the threats. The electrooptics play a crucial role in the IMINT, technologies such as 2D and 3D urban terrain mapping, targets geolocation, building interior mapping are only part of the technologies that will be discussed. From dcohen at bgu.ac.il Mon Jan 2 09:23:51 2006 From: dcohen at bgu.ac.il (Doron Cohen) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-02 Condensed Matter Seminar Message-ID: Condensed Matter Seminar DATE: 02-01-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Emergence of biological codes as phase transitions induced by error-load topology SPEAKER: Dr. Tsvi Tlusty, Physics of Complex Systems, The Weizmann Institute ABSTRACT/COMMENTS: Any information in the cell is written and read on a microscopic scale, where the typical recognition energy of the molecules is not much larger than their thermal energy. Such information channel is inherently noisy and must adapt through evolution to cope with the potential errors. Can such optimization explain the origins of biological codes? - We examine a scenario in which evolution drives the emergence of a genetic code by selecting for a map that minimizes the impact of errors. The emergence of the code is actually a phase transition that is governed by the topology of noise. Similar phase transitions may suggest a mechanism for the formation of other error-prone biological codes, such as the transcription network. From dcohen at bgu.ac.il Mon Jan 2 09:24:49 2006 From: dcohen at bgu.ac.il (Doron Cohen) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-03 Lasers Seminar Message-ID: Lasers Seminar DATE: 03-01-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Three-Level Laser Models with Incoherent Pumping SPEAKER: Avi Ben-Arie, Physics Department Ben Gurion University. ABSTRACT/COMMENTS: The dynamics and photon quantum statistics of three-level laser systems with incoherent pumping will be reviewed in a comparative approach using three theoretical models: Lambda, V and ladder. From dcohen at bgu.ac.il Mon Jan 2 09:25:59 2006 From: dcohen at bgu.ac.il (Doron Cohen) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-04 nanotechnology workshop Message-ID: Please note the change in room of seminar Nanotechnology workshop, Wednesday January 04, 12:00 Chemical Engineering Department seminar room (building 59, room 235) Title: Boundary lubrication under water Speaker: Prof. Jacob Klein Dept. of Materials and Interfaces, Weizmann Institute of Science From dcohen at bgu.ac.il Mon Jan 2 09:26:56 2006 From: dcohen at bgu.ac.il (Doron Cohen) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-10 Lasers Seminar Message-ID: Lasers Seminar DATE: 10-01-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: The chemical oxygen-iodine laser (COIL): Exploitation of the magic O2(1D) molecule SPEAKER: Prof. S. Rosenwaks, Department of Physics Ben-Gurion University of the Negev P.O. Box 653, Beer-Sheva 84105, Israel From dcohen at bgu.ac.il Mon Jan 2 09:28:11 2006 From: dcohen at bgu.ac.il (Doron Cohen) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-03-21 Lasers Seminar Message-ID: Lasers Seminar DATE: 21-03-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Planar Optics Head-up Display SPEAKER: Dr. Ioseph Gurwich, ELOP Israel ABSTRACT/COMMENTS: A planar head-up display based on utilizing of total internal reflection propagation is described. Such a device is exploited for a virtual image projection display in see-through or not see-through viewing applications. The principles and methods are described which allow for providing a necessary observation distance, a field of view and brightness uniformity for the output image. From hbaruch at bgu.ac.il Mon Jan 2 14:51:56 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-09 Condensed Matter Seminar Message-ID: <200601021251.OAA76972818@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 09-01-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Mechanics of chemoreceptor signaling in bacteria SPEAKER: Dr. Ady Vaknin, Department of Molecular and Cellular Biology, and the Rowland Institute, Harvard university, U.S.A. ABSTRACT/COMMENTS: Bacterial cells can sense and respond to many chemical and physical stimuli in their environment. How are these signals detected and communicated across the cell membrane? By measuring the polarization of light emitted from fluorescently tagged receptors in living cells, we are gaining insight into the mechanical events that mediate transmembrane signaling in the chemotaxis system. Detection of osmotic pressure and ligand-binding will be discussed. From hbaruch at bgu.ac.il Mon Jan 2 15:07:23 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-12 Condensed Matter Seminar Message-ID: <200601021307.PAA76918147@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 12-01-2006 TIME: 11:30am Thursday -- note special date PLACE: Physics club (Building 29, room 002) TITLE: Schwinger boson approach with phase coherence for an Andeson impurity SPEAKER: Dr. Eran Lebanon, Dept. of Physics and Astronomy, Rutgers University, U.S.A. ABSTRACT/COMMENTS: I will present a Luttinger-Ward approach for a general Anderson impurity problem in the Schwinger boson spin representation. The approach is devised to allow fluctuation of all the particle species and to recover the exact large-N limit when taking N to infinity. As a Luttinger-Ward functional approach it is thermodynamically conserving and recovers all the coresponding sum-rules. The approach describes the crossover from high to low energy physics, and recovers the low-temperature Fermi liquid for the exactly screened cases, with the correct thermodynamics phase shifts and Ward identities. A major advantage of the approach is the possibility to extend it to the important problems of non-equilibrium conditions as manifested in mesoscopic samples, and of quantum criticality in the Anderson/Kondo lattices which model heavy-fermions and metallic antiferromagnets. From ramyb at bgu.ac.il Tue Jan 3 11:42:33 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-05 Physics Colloquium Message-ID: <200601030942.LAA77843975@tzin.bgu.ac.il> Physics Colloquium DATE: 05-01-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: How does a protein find its site on DNA SPEAKER: , Prof. Leonid Mirny MIT, Division of Health Sciences and Technology, and Department of Physics ABSTRACT/COMMENTS: Refreshments are served at 3:20pm From hbaruch at bgu.ac.il Tue Jan 3 17:38:17 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-10 Condensed Matter Seminar-special Message-ID: <200601031538.RAA78484813@tzin.bgu.ac.il> Condensed Matter Seminar-special DATE: 10-01-2006 TIME: 11:30am Tuesday -- note special day PLACE: Physics club (Building 29, room 002) TITLE: Orbitally-driven superstructures in correlated electron systems SPEAKER: Prof. D.I. Khomskii, University of Köln, Germany ABSTRACT/COMMENTS: Orbital degrees of freedom in strongly correlated systems often lead to specific types of orbital and spin ordering. For example, unusual complicated superstructures are observed in many transition metal oxides. In this talk I will discuss several examples of such oxides paying main attention to an interplay of charge, spin and orbital degrees of freedom. Among these examples is the famous magnetite for which I propose the model of charge and orbital ordering using the idea of an interplay between site- and bond-centered ordering. This model seems to explain both the structural data and the presence of ferroelectricity in Fe3O4 below Verwey transition. From kletter at bgu.ac.il Wed Jan 4 11:10:57 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-12 NLD seminar Message-ID: <20060104090321.CC1E833E7A@smtp2.bgu.ac.il> A Nonlinear Dynamics seminar on: Coding of stimulus frequency by latency in thalamic networks Speaker: Dr. David Golomb, Department of Physiology, Faculty of Health Sciences, BGU Thursday, January 12 2006 at 11:00, the Physics club (room 002, building 29). ABSTRACT attached. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html -------------- next part -------------- A non-text attachment was scrubbed... Name: golomb.pdf Type: application/pdf Size: 2951 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060104/bf03948d/golomb.pdf From kletter at bgu.ac.il Wed Jan 4 11:13:55 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-05 NO NLD seminar - reminder Message-ID: <20060104090619.D351733E76@smtp2.bgu.ac.il> I would like to remind you that we will NOT have a seminar tomorrow. We will meet again next week as posted. For abstracts, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From nano at bgu.ac.il Wed Jan 4 00:05:53 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-11 nanotechnology workshop Message-ID: <005a01c610b1$dd811d40$1b0e4884@estinano> Please note the change in room of seminar Nanotechnology workshop, Wednesday January 11, 12:00 Chemical Engineering Department seminar room (building 59, room 235) Title : DNA in a Nanopore Speaker: Prof. Yitzhak Rabin Dept. of Physics Bar-Ilan University -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060104/82d10696/attachment.htm From ramyb at bgu.ac.il Thu Jan 5 10:56:27 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-05 Physics Colloquium Message-ID: <200601050856.KAA79556727@tzin.bgu.ac.il> Physics Colloquium DATE: 05-01-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: How does a protein find its site on DNA SPEAKER: , Prof. Leonid Mirny MIT, Division of Health Sciences and Technology, and Department of Physics ABSTRACT/COMMENTS: Today!! Refreshments are served at 3:20pm From ramyb at bgu.ac.il Wed Jan 11 10:18:05 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2005-01-12 Physics Colloquium Message-ID: <200601110818.KAA86775584@tzin.bgu.ac.il> Physics Colloquium DATE: 12-01-2005 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Coherent Control and Manipulation of Two-Electron Spin States SPEAKER: , Prof. Amir Yacobi The Weizmann institute ABSTRACT/COMMENTS: Refreshments are served at 3:20pm From kletter at bgu.ac.il Wed Jan 11 10:52:50 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-19 NLD seminar Message-ID: <20060111084449.3A12D33E76@smtp2.bgu.ac.il> A Nonlinear Dynamics seminar on: 3D long-wave oscillatory patterns in Marangoni convection with Soret effect Speaker: Dr. Sergey Shklyaev, Technion Thursday, January 19 2006 at 11:00, the Physics club (room 002, building 29). ABSTRACT attached. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html -------------- next part -------------- A non-text attachment was scrubbed... Name: shklyaev.pdf Type: application/pdf Size: 10164 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060111/12c4f2f6/shklyaev.pdf From kletter at bgu.ac.il Wed Jan 11 10:55:13 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-12 NLD seminar - reminder Message-ID: <20060111084711.CD1FE33E77@smtp2.bgu.ac.il> A Nonlinear Dynamics seminar on: Coding of stimulus frequency by latency in thalamic networks Speaker: Dr. David Golomb, Department of Physiology, Faculty of Health Sciences, BGU Tomorrow, January 12 2006 at 11:00, the Physics club (room 002, building 29). For abstracts, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From nano at bgu.ac.il Wed Jan 11 00:11:01 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-18 nanotechnology workshop Message-ID: <004901c61632$bda96910$1b0e4884@estinano> Please note the change in room of seminar Nanotechnology workshop, Wednesday January 18, 12:00 Chemical Engineering Department seminar room (building 59, room 235) Title : Nanobiotechnology : From Sensors and Circuitry to Smart Machines. Speaker: Prof. Itamar Willner The Institute of Chemistry The Hebrew University of Jerusalem -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060111/8770cf55/attachment.htm From hbaruch at bgu.ac.il Thu Jan 12 17:13:43 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-15 Condensed Matter Seminar - special Message-ID: <200601121513.RAA87247618@tzin.bgu.ac.il> Condensed Matter Seminar - special DATE: 15-01-2006 TIME: 11:30am Sunday -- note special day PLACE: Physics club (Building 29, room 002) TITLE: On a possible solution to the dynamic scaling of hysteresis problem SPEAKER: Dr. Eshel Faraggi , Dept. of Physics, Florida International University, U.S.A. ABSTRACT/COMMENTS: Hysteresis lays at the foundation of many fundamental and applicative problems. The dynamic scaling of hysteresis refers to the dependence of the area of the hysteresis loop on the system parameters. As can easily be shown the area of a hysteresis loop is intimately related to the energy dissipated in an hysteresis cycle. In the talk, the problem of the dynamic scaling of hysteresis will be presented. Emphasis will be put on seemingly contradicting experimental results regarding this problem, and a solution to this apparent contradiction will be presented. From hbaruch at bgu.ac.il Thu Jan 12 17:23:33 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-17 Condensed Matter Seminar - special Message-ID: <200601121523.RAA87192654@tzin.bgu.ac.il> Condensed Matter Seminar - special DATE: 17-01-2006 TIME: 11:30am Tuesday -- note special day PLACE: Physics club (Building 29, room 002) TITLE: Dynamic process of molecules on the surface investigated by scanning tunneling microscopy SPEAKER: Prof. Tadahiro Komeda, Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Japan ABSTRACT/COMMENTS: The capability of scanning tunneling microscopy (STM) to provide real space imaging of surface with an atomic scale resolution has revealed magnificent diversity of physical, chemical and electronic phenomena on the surface. The unique character of STM, however, is not limited to the real space imaging; a lot of attentions have been paid for the unique character of tunneling current as an electron source. In this talk, I describe recent researches which utilize STM as an electron source for the investigation of molecules adsorbed on surfaces. Inelastic tunneling spectroscopy (IETS) with STM set-up is described. The technique can detect vibration modes of molecules through inelastic tunneling (IET) processes. Excitation mechanism of STM-IETS is discussed in comparison with the one for electron energy loss spectroscopy (EELS) and its application to molecules is examined. Next I describe the manipulation of adsorbates by the injection of tunneling electrons; the phenomena in clude desorption, hopping, and chemical reactions. They are caused either by electronic excitation and vibrational heating. Intriguing multiple excitation of vibrational ladder for site specific chemical reaction is discussed. From hbaruch at bgu.ac.il Thu Jan 12 23:10:11 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-16 Condensed Matter Seminar Message-ID: <200601122110.XAA88689882@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 16-01-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: The Spin-Hall effect SPEAKER: Prof. David Schmeltzer, Department of Physics City College of the City University of New York, U.S.A. ABSTRACT/COMMENTS: The Spin Hall current for a 2DEG is investigated. The Spin Current is only Covariantly conserved. I find that the current is composed of a regular and a topological contribution. The topological part is determined by the non-commuting cartesian coordinates and is similar to the Quantum Hall case. Due to the fact that the system has no gap the topological part is renormalized from the value of |e|/4\\pi to the value of |e|/8\\pi ! In the presence of large Zeeman field the Spin Hall conductivity is given by the topological part only, |e|/4\\pi. The effect of a single impurity scattering causes the Spin Hall conductivity to vanishes with the length of the two dimensional electron gas system. From nano at bgu.ac.il Mon Jan 16 00:16:24 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-18 nanotechnology workshop Message-ID: <007401c61a21$52400c90$1b0e4884@estinano> Please note the change in room of seminar Nanotechnology workshop, Wednesday January 18, 12:00 Chemical Engineering Department seminar room (building 59, room 235) Title : Nanobiotechnology : From Sensors and Circuitry to Smart Machines. Speaker: Prof. Itamar Willner The Institute of Chemistry The Hebrew University of Jerusalem -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060116/d805b41b/attachment.htm From ramyb at bgu.ac.il Wed Jan 18 09:31:21 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2005-01-19 Physics Colloquium Message-ID: <200601180731.JAA94776362@tzin.bgu.ac.il> Physics Colloquium DATE: 19-01-2005 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Gone with a Bang - Identifying the Progenitors of Supernovae SPEAKER: Dr. Avishay Gal-Yam, CALTECH, Pasadena ABSTRACT/COMMENTS: Come and learn about the state of the art in hunting cosmic explosions! Dr. Gal-Ya, is a member of one of the leading teams in the world. Abstract: Supernovae (SNe) have been observationally studied for decades, with significant progress in our understanding of these explosions, however, the underlying physics is still far from being well known. I will describe an ongoing program using high-resolution adaptive-optics Keck observations to identify the progenitors of nearby core-collapse SNe, or constrain their properties. We attempt to achieve a complete progenitor-SN map, providing a critical test for core-collapse models, required to explain the observed SN properties given the progenitor constraints. Refreshments are served at 3:20pm From nano at bgu.ac.il Tue Jan 17 22:08:46 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-18 nanotechnology workshop- canceeled Message-ID: <002001c61ba1$d2d755d0$1b0e4884@estinano> The seminar today 18/01/06 is cancelled!!!! -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060117/7bc24ee7/attachment.htm From ramyb at bgu.ac.il Wed Jan 18 10:14:17 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-19 Physics Colloquium Message-ID: <200601180814.KAA94852246@tzin.bgu.ac.il> Physics Colloquium DATE: 19-01-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Gone with a Bang - Identifying the Progenitors of Supernovae SPEAKER: , Dr. Avishay Gal-Yam CALTECH, Pasadena ABSTRACT/COMMENTS: Tomorrow! Refreshments are served at 3:20pm From nano at bgu.ac.il Wed Jan 18 00:51:36 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-25 nanotechnology workshop Message-ID: <00ad01c61bb8$91e600a0$1b0e4884@estinano> Nanotechnology workshop, Wednesday January 25, 12:00 Chemical Engineering Department seminar room (building 59, room 235) Title : Weak Ergodicity Breaking: From Blinking Quantum Dots to Sub-Diffusion in Polymer Networks Speaker: Dr. Eli Barkai Dept. of Physics, Bar-Ilan University -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060118/08931173/attachment.htm From kletter at bgu.ac.il Wed Jan 18 14:17:44 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-19 NLD seminar - reminder Message-ID: <20060118120918.3F16333E78@smtp2.bgu.ac.il> A Nonlinear Dynamics seminar on: 3D long-wave oscillatory patterns in Marangoni convection with Soret effect Speaker: Dr. Sergey Shklyaev, Technion Tomorrow, January 19 2006 at 11:00, the Physics club (room 002, building 29). For abstracts, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From kletter at bgu.ac.il Wed Jan 18 14:19:12 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-26 NO NLD seminar Message-ID: <20060118121045.CF97433E78@smtp2.bgu.ac.il> We will not have a NLD seminar next week. For abstracts, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From hbaruch at bgu.ac.il Wed Jan 18 15:41:24 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-23 Condensed Matter Seminar Message-ID: <200601181341.PAA94742434@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 23-01-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Interference and transport in the \\nu=5/2 non-abelian quantum Hall state SPEAKER: Prof. Ady Stern, Condensed Matter Physics, Weizmann Institute ABSTRACT/COMMENTS: From ramyb at bgu.ac.il Thu Jan 19 10:02:13 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-19 Physics Colloquium Message-ID: <200601190802.KAA95728769@tzin.bgu.ac.il> Physics Colloquium DATE: 19-01-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Gone with a Bang - Identifying the Progenitors of Supernovae SPEAKER: , Dr. Avishay Gal-Yam CALTECH, Pasadena ABSTRACT/COMMENTS: NOTE: EARLY START, EARLY END, TODAY Dr. Gal-Yam has to leave immediately after the colloquium, so we will start at 15:30 sharp and end at 16:25. Please make an effort to come 5 minutes early for today\'s colloquium Refreshments are served at 3:20pm From ramyb at bgu.ac.il Tue Jan 24 23:20:10 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-26 Physics Colloquium Message-ID: <200601242120.XAA101101997@tzin.bgu.ac.il> Physics Colloquium DATE: 26-01-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Dark matter or new gravitation physics? SPEAKER: , Prof. Yacov Bekenstein Racah Institute, Hebrew University of Jerusalem ABSTRACT/COMMENTS: Refreshments are served at 3:20pm The last colloquium of this semester! Based on the following articles astro-ph/0403694 , astro-ph/0412652 , astro-ph/0509519 From kletter at bgu.ac.il Wed Jan 25 10:13:49 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-26 No NLD seminar - reminder Message-ID: <20060125080500.93A7633E78@smtp2.bgu.ac.il> NO Nonlinear Dynamics seminar tomorrow, January 26 2006. For abstracts, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From hbaruch at bgu.ac.il Fri Jan 27 11:03:10 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-01-30 Condensed Matter Seminar Message-ID: <200601270903.LAA105072248@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 30-01-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Superconductivity probes superconductivity SPEAKER: Dr. Amir Kohen, Institut des Nanosciences de Paris, France ABSTRACT/COMMENTS: The use of superconducting (SC) tips in Scanning Tunneling Spectroscopy has been the goal of several groups in recent years. Such tips enhance the measured spectroscopic features and allow the measurements of pair tunneling (Josephson) currents. So far results were limited to a single point without scanning. We advance one step forward by measuring conductance maps. With a Nb tip we map the vortex lattice in NbSe2 revealing in a single image both the vortex cores and the screening currents around them. Using an MgB2 tip on an MgB2 sample under applied field we produce the first images of a Josephson STM (JSTM). From hbaruch at bgu.ac.il Wed Feb 15 10:22:36 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-02-19 Condensed Matter Seminar -- Special Message-ID: <200602150822.KAA125463099@tzin.bgu.ac.il> Condensed Matter Seminar -- Special DATE: 19-02-2006 TIME: 11:30am Sunday -- note special day PLACE: Physics club (Building 29, room 002) TITLE: Energy relaxation due to magnetic impurities in mesoscopic wires SPEAKER: Prof. Alfréd Zawadowski, Institute of Physics, Budapest University of Technology and Economics, Hungary ABSTRACT/COMMENTS: From physics at bgu.ac.il Sun Feb 19 09:57:51 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-02-22 Astrophysics and Cosmology Seminar Message-ID: <200602190757.JAA130025408@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 22-02-2006 TIME: 12:00 noon (Wed) PLACE: Physics club (Building 29, room 002) TITLE: Forced oscillations in (M)HD accretion disks and kHz-QPOs SPEAKER: Dr. Jerom Petri, MPI fur Kernphysik, Heidelberg ABSTRACT/COMMENTS: From hbaruch at bgu.ac.il Mon Feb 20 16:23:49 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-02-23 Condensed Matter Seminar Message-ID: <200602201423.QAA132618212@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 23-02-2006 TIME: 11:30am Thursday -- note special day PLACE: Physics club (Building 29, room 002) TITLE: מדידת קבועים אלסטיים בסקאלה ננומטרית בעזרת מיקרוסקופ מנהור סורק SPEAKER: אלדד פרץ, Dept. of Physics, Ben-Gurion University ABSTRACT/COMMENTS: Candidacy seminar for \"meshulav\" track. From hbaruch at bgu.ac.il Mon Feb 20 18:27:35 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-02-23 Condensed Matter Seminar - special Message-ID: <200602201627.SAA132149235@tzin.bgu.ac.il> Condensed Matter Seminar - special DATE: 23-02-2006 TIME: 11:30am Thursday -- note special day PLACE: Physics club (Building 29, room 002) TITLE: Measuring elastic constants on nanometric scale using STM SPEAKER: Eldad Peretz, Department of Physics, Ben-Gurion Univesrity ABSTRACT/COMMENTS: Candidacy seminar for \"meshulav\" track. From hbaruch at bgu.ac.il Thu Feb 23 17:33:37 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-02-28 Condensed Matter Seminar - Special Message-ID: <200602231533.RAA136098692@tzin.bgu.ac.il> Condensed Matter Seminar - Special DATE: 28-02-2006 TIME: 11:30am - Tuesday -- note special day PLACE: Physics club (Building 29, room 002) TITLE: Piezoelectric effects in Self Assembled Quantum Dots of InAs/GaAs SPEAKER: Moshe Ofer, Department of Physics, Ben-Gurion University ABSTRACT/COMMENTS: Candidate for \"meshulav\" track From nano at bgu.ac.il Sun Feb 26 23:56:33 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-03-08 nanotechnology workshop Message-ID: <00a701c63b1f$81ec2680$1b0e4884@estinano> Please note the change in room of seminar( back to Chemistry Department seminar room) Nanotechnology workshop, Wednesday March 8, 12:00 Chemical Engineering Department seminar room (building 29, room 306,Chemistry Department seminar room) Title : Dielectrophoresis as a tool to deposit individual single-wall carbon nanotubes Speaker: Matti Oron, Institute for Physical Chemistry, Karlsruhe University -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060226/1b7671ca/attachment.htm From SHUKER at bgu.ac.il Tue Feb 28 17:16:13 2006 From: SHUKER at bgu.ac.il (SHUKER@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-03-08 Lasers Seminar WITH CHEM. PHYS. Message-ID: <200602281516.RAA141489134@tzin.bgu.ac.il> Lasers Seminar WITH CHEM. PHYS. DATE: 08-03-2006 TIME: 16:00 NOTE CHANGE PLACE: CHEMISTRY SEMINAR ROOM (NOTE CHANGE) TITLE: Feshbach resonance and atomic waveguides. I. Two-body aspects SPEAKER: Dr. V. A. Yurovsky, Tel-Aviv University ABSTRACT/COMMENTS: Tight cylindrical confinements, or atomic waveguides, can be realized in optical lattices, elongated atomic traps, and atomic integrated optics devices. The interaction of two atoms in an atomic waveguide can be considered as a one-dimensional zero-range interaction whenever the collision or binding energies remain small compared to the transverse waveguide frequency. Due to coupling to excited transverse states, the interaction strength demonstrates a resonant behavior. The use of Feshbach resonance due to coupling of open and closed channels for tuning the elastic scattering length leads to additional energy dependence. A combined effect of confinement and Feshbach resonance can be taken into account in a one-dimensional two-channel model. Quasi-one-dimensional diatomic molecules are superpositions of the closed channel state and the ground and excited waveguide modes of the open channel. The closed-channel contribution becomes substantial for weak resonances. A confinemen t can lead also to suppression of inelastic collisions. From SHUKER at bgu.ac.il Tue Feb 28 17:22:48 2006 From: SHUKER at bgu.ac.il (SHUKER@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-03-08 Lasers Seminar WITH CHEM. PHYS. Message-ID: <200602281522.RAA141600452@tzin.bgu.ac.il> Lasers Seminar WITH CHEM. PHYS. DATE: 08-03-2006 TIME: 16:00 NOTE CHANGE OF DAY PLACE: Bldg. 29, Room 306 (Seminar Room) NOTE CHANGE TITLE: Feshbach resonance and atomic waveguides. I. Two-body aspects SPEAKER: Dr. V. A. Yurovsky, Tel-Aviv University ABSTRACT/COMMENTS: Tight cylindrical confinements, or atomic waveguides, can be realized in optical lattices, elongated atomic traps, and atomic integrated optics devices. The interaction of two atoms in an atomic waveguide can be considered as a one-dimensional zero-range interaction whenever the collision or binding energies remain small compared to the transverse waveguide frequency. Due to coupling to excited transverse states, the interaction strength demonstrates a resonant behavior. The use of Feshbach resonance due to coupling of open and closed channels for tuning the elastic scattering length leads to additional energy dependence. A combined effect of confinement and Feshbach resonance can be taken into account in a one-dimensional two-channel model. Quasi-one-dimensional diatomic molecules are superpositions of the closed channel state and the ground and excited waveguide modes of the open channel. The closed-channel contribution becomes substantial for weak resonances. A confinemen t can lead also to suppression of inelastic collisions. From SHUKER at bgu.ac.il Tue Feb 28 17:24:43 2006 From: SHUKER at bgu.ac.il (SHUKER@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-03-15 Lasers Seminar WITH CHEM. PHYS. Message-ID: <200602281524.RAA140733348@tzin.bgu.ac.il> Lasers Seminar WITH CHEM. PHYS. DATE: 15-03-2006 TIME: 16:00 NOTE CHANGE OF DAY PLACE: Bldg. 29, Room 306 (Seminar Room) NOTE CHANGE TITLE: Feshbach resonance and atomic waveguides. II. Many-body aspects SPEAKER: Dr. V. A. Yurovsky, Tel-Aviv University ABSTRACT/COMMENTS: A many-body one-dimensional problem with an energy independent strength (the Lieb-Liniger-McGuire model) has an exact solution and forbids all chemical processes, such as three-atom association and diatom dissociation, as well as reflection in atom-diatom collisions. The related problem with resonant interaction becomes non-integrable. A three-body case is analyzed by a numerical solution of the Faddeev-Lovelace equations. The results demonstrate that the reflection and chemical reactions become allowed and may be observed in experiments. A many-body one-dimensional problem with an energy independent strength (the Lieb-Liniger-McGuire model) has an exact solution and forbids all chemical processes, such as three-atom association and diatom dissociation, as well as reflection in atom-diatom collisions. The related problem with resonant interaction becomes non-integrable. A three-body case is analyzed by a numerical solution of the Faddeev-Lovelace equations. The results demon strate that the reflection and chemical reactions become allowed and may be observed in experiments. From SHUKER at bgu.ac.il Tue Feb 28 17:31:44 2006 From: SHUKER at bgu.ac.il (SHUKER@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-04-05 Lasers Seminar WITH CHEM. PHYS. Message-ID: <200602281531.RAA141328386@tzin.bgu.ac.il> Lasers Seminar WITH CHEM. PHYS. DATE: 05-04-2006 TIME: 16: 00 (Wed) NOTE CHANGE DAY AND TIME PLACE: Bldg. 29, Room 306 (Seminar Room) NOTE CHANGE TITLE: One-mirror Fabry-Perot interferometer SPEAKER: Dr. Daniel Rohrlich, Ben-Gurion University ABSTRACT/COMMENTS: We describe a new and distinctive interferometry in which a probe particle scatters off a superposition of locations of a single free target particle. In one dimension, probe particles incident on superposed locations of a single \"mirror\" can interfere as if in a Fabry-Perot interferometer; in two dimensions, probe particles scattering off superposed locations of a single \"slit\" can interfere as if in a two-slit Young interferometer. The condition for interference is loss of orthogonality of the target states and reduces, in simple examples, to transfer of orthogonality from target to probe states. We analyze experimental parameters and conditions necessary for interference to be observed. From shuker at bgu.ac.il Tue Feb 28 17:37:19 2006 From: shuker at bgu.ac.il (shuker@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-05-17 Lasers Seminar WITH CHEM. PHYS. Message-ID: <200602281537.RAA141300277@tzin.bgu.ac.il> Lasers Seminar WITH CHEM. PHYS. DATE: 17-05-2006 TIME: 12: 00 (Wed) NOTE CHANGE DAY AND TIME PLACE: Bldg. 29, Room 306 (Seminar Room) NOTE CHANGE TITLE: Nonlinear Microscopy with Femtosecond pulses. SPEAKER: Prof. Yaron Silberberg , Physics Department Weizmann Institute ABSTRACT/COMMENTS: From SHUKER at bgu.ac.il Tue Feb 28 17:42:19 2006 From: SHUKER at bgu.ac.il (SHUKER@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-03-07 Lasers Seminar Message-ID: <200602281542.RAA141520598@tzin.bgu.ac.il> Lasers Seminar DATE: 07-03-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: HAPPY PURIM!!! SPEAKER: , ABSTRACT/COMMENTS: From band at bgu.ac.il Wed Mar 1 11:05:10 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-03-08 Physical Chemistry Seminar Message-ID: <200603010905.LAA142097408@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 08-03-2006 TIME: 4:00 pm (Wed) PLACE: Building 29, room 306 TITLE: Feshbach resonance and atomic waveguides I. Two-body aspects SPEAKER: Dr. V. A. Yurovsky, Tel-Aviv University ABSTRACT/COMMENTS: Tight cylindrical confinements, or atomic waveguides, can be realized in optical lattices, elongated atomic traps, and atomic integrated optics devices. The interaction of two atoms in an atomic waveguide can be considered as a one-dimensional zero-range interaction whenever the collision or binding energies remain small compared to the transverse waveguide frequency. Due to coupling to excited transverse states, the interaction strength demonstrates a resonant behavior. The use of Feshbach resonance due to coupling of open and closed channels for tuning the elastic scattering length leads to additional energy dependence. A combined effect of confinement and Feshbach resonance can be taken into account in a one-dimensional two-channel model. Quasi-one-dimensional diatomic molecules are superpositions of the closed channel state and the ground and excited waveguide modes of the open channel. The closed-channel contribution becomes substantial for weak resonances. A confinement can lead also to suppression of inelastic collisions. From jung at bgu.ac.il Wed Mar 1 12:02:00 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-03-06 Condensed Matter Seminar Message-ID: <200603011002.MAA142841678@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 06-03-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Deterministic teleportation of electrons in a quantum dot nanostructure SPEAKER: Prof. Miriam Blaauboer, Kavli Institute of NanoScience Delft University of Technology The Netherlands ABSTRACT/COMMENTS: In recent years the creation, manipulation and detection of entanglement between individual electrons in solid-state nanostructures has become a topic of active research. Entanglement between electrons has so far not been observed, and is interesting in view of the prospect of using entangled electrons for quantum communication and quantum computation purposes. In this talk, I will focus on how entanglement can be used as a source for quantum information transfer in solid-state systems. As an illustration, I will then discuss a recent idea for how electrons an be teleported in a nanostructure consisting of quantum dots. From kletter at bgu.ac.il Wed Mar 1 17:11:04 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-03-09 NLD seminar Message-ID: <20060301150010.7769D33E78@smtp2.bgu.ac.il> A Nonlinear Dynamics seminar on: On the nature of (nearly) collisionless plasma under pulsed magnetic fields Speaker: Rami Doron Faculty of Physics, Weizmann Inst. Thursday, March 09 2006 at 11:00, the Physics club (room 002, building 29). ABSTRACT attached. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html -------------- next part -------------- A non-text attachment was scrubbed... Name: doron.pdf Type: application/pdf Size: 3919 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060301/ddcab6b9/doron.pdf From nano at bgu.ac.il Sun Mar 5 23:00:41 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-03-08 nanotechnology workshop Message-ID: <003a01c64097$dcd69e90$1b0e4884@estinano> ----- Original Message ----- From: Nano To: nano center Sent: Sunday, February 26, 2006 11:56 PM Subject: 2006-03-08 nanotechnology workshop Please note the change in room of seminar( back to Chemistry Department seminar room) Nanotechnology workshop, Wednesday March 8, 12:00 Chemical Engineering Department seminar room (building 29, room 306,Chemistry Department seminar room) Title : Dielectrophoresis as a tool to deposit individual single-wall carbon nanotubes Speaker: Matti Oron, Institute for Physical Chemistry, Karlsruhe University -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060305/fba54df6/attachment.htm From nano at bgu.ac.il Sun Mar 5 23:02:13 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-03-08 nanotechnology workshop Message-ID: <004201c64098$1485af70$1b0e4884@estinano> ----- Original Message ----- From: Nano To: nano center Sent: Sunday, February 26, 2006 11:56 PM Subject: 2006-03-08 nanotechnology workshop Please note the change in room of seminar( back to Chemistry Department seminar room) Nanotechnology workshop, Wednesday March 8, 12:00 Chemical Engineering Department seminar room (building 29, room 306,Chemistry Department seminar room) Title : Dielectrophoresis as a tool to deposit individual single-wall carbon nanotubes Speaker: Matti Oron, Institute for Physical Chemistry, Karlsruhe University -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060305/617b59cb/attachment.htm From ramyb at bgu.ac.il Tue Mar 7 11:36:58 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-03-09 Physics Colloquium Message-ID: <200603070936.LAA149105680@tzin.bgu.ac.il> Physics Colloquium DATE: 09-03-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Fractional Charge and Fractional Statistics SPEAKER: , Prof. Y. Gefen Faculty of Physics, the Weizmann Institute ABSTRACT/COMMENTS: Refreshments are served at 3:20pm Abstract: An electron gas confined to two-dimensions in the presence of a strong magnetic field is a fascinating laboratory to test our understanding of topological concepts, at the very core of quantum solid state. Laughlin\'s theory of the fractional quantum Hall effect predicts the existence of quasi-particles whose charge is a fraction of the electron charge, and whose statistics is intermediate between bosons and fermions. Fractional charge and fractional statistics are thus intimately related to each other. I will review some of the recent activity on these topics, and will address the question of how to design experiments that test either the former or the latter. From SHUKER at bgu.ac.il Tue Mar 7 16:49:54 2006 From: SHUKER at bgu.ac.il (SHUKER@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-05-17 Lasers Seminar WITH NANO WORKSHOP Message-ID: <200603071449.QAA149576074@tzin.bgu.ac.il> Lasers Seminar WITH NANO WORKSHOP DATE: 17-05-2006 TIME: 12: 00 (Wed) NOTE CHANGE DAY AND TIME PLACE: Bldg. 29, Room 306 (Seminar Room) NOTE CHANGE TITLE: Nonlinear Microscopy with Femtosecond pulses. SPEAKER: Prof. Yaron Silberberg , Physics Department Weizmann Institute ABSTRACT/COMMENTS: Lasers Seminar WITH NANO WORKSHOP From kletter at bgu.ac.il Wed Mar 8 12:07:07 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:20 2009 Subject: [Phys-seminars] 2006-03-09 NLD seminar - reminder Message-ID: <20060308095550.8ADA933E62@smtp2.bgu.ac.il> A Nonlinear Dynamics seminar on: On the nature of (nearly) collisionless plasma under pulsed magnetic fields Speaker: Rami Doron Faculty of Physics, Weizmann Inst. Tomorrow, March 09 2006 at 11:00, the Physics club (room 002, building 29). For abstracts, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From nano at bgu.ac.il Wed Mar 8 00:10:45 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-15 nanotechnology workshop Message-ID: <007901c64233$fbc058d0$1b0e4884@estinano> Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: Abstract- Nir Gov.doc Type: application/msword Size: 24576 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060308/953faad1/Abstract-NirGov.doc From kletter at bgu.ac.il Wed Mar 8 14:13:13 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-16 NLD seminar Message-ID: <20060308120155.EB86433E77@smtp2.bgu.ac.il> A Nonlinear Dynamics seminar on: Dam breaking by catastrophic erosional incision Speaker: Dr. Jost von Hardenberg CIMA, Universita; degli Studi di Genova, Italy Thursday, March 16 2006 at 11:00, the Physics club (room 002, building 29). ABSTRACT attached. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html -------------- next part -------------- A non-text attachment was scrubbed... Name: vonHardenberg.pdf Type: application/pdf Size: 4025 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060308/0516b7c9/vonHardenberg.pdf From band at bgu.ac.il Wed Mar 8 15:27:21 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-15 Physical Chemistry Seminar Message-ID: <200603081327.PAA150206174@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 15-03-2006 TIME: 4:00pm (Wed) PLACE: Building 28, room 104 TITLE: Feshbach resonance and atomic waveguides. II. Many-body aspects SPEAKER: Dr. V. A. Yurovsky, Tel-Aviv University ABSTRACT/COMMENTS: A many-body one-dimensional problem with an energy independent strength (the Lieb-Liniger-McGuire model) has an exact solution and forbids all chemical processes, such as three-atom association and diatom dissociation, as well as reflection in atom-diatom collisions. The related problem with resonant interaction becomes non-integrable. A three-body case is analyzed by a numerical solution of the Faddeev-Lovelace equations. The results demonstrate that the reflection and chemical reactions become allowed and may be observed in experiments. A many-body one-dimensional problem with an energy independent strength (the Lieb-Liniger-McGuire model) has an exact solution and forbids all chemical processes, such as three-atom association and diatom dissociation, as well as reflection in atom-diatom collisions. The related problem with resonant interaction becomes non-integrable. A three-body case is analyzed by a numerical solution of the Faddeev-Lovelace equations. The results demons trate that the reflection and chemical reactions become allowed and may be observed in experiments. From ramyb at bgu.ac.il Thu Mar 9 08:33:50 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-09 Physics Colloquium Message-ID: <200603090633.IAA151639262@tzin.bgu.ac.il> Physics Colloquium DATE: 09-03-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Fractional Charge and Fractional Statistics SPEAKER: , Prof. Y. Gefen Faculty of Physics, the Weizmann Institute ABSTRACT/COMMENTS: Today! the first colloquium of the semester. A leading expert apeaking on an interesting subject + a high probability for upgraded refreshments ==> come early ... Refreshments are served at 3:20pm From jung at bgu.ac.il Thu Mar 9 13:42:06 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-20 Condensed Matter Seminar Message-ID: <200603091142.NAA151678749@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 20-03-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Enhanced self-attraction of proteins and its evolutionary implications SPEAKER: Dima Lukatsky, Computational Biophysics Laboratory, Department of Chemistry and Chemical Biology, ‎Harvard University, Cambridge MA ABSTRACT/COMMENTS: Recent findings demonstrate that maintaining low sequence identity is a key ‎evolutionary mechanism that inhibits protein aggregation. We investigate statistical ‎properties of interacting protein-like surfaces and predict the effect of universal, ‎enhanced self-attraction of proteins. The effect originates in the fact that a pattern ‎self-match between two identical, even randomly organized interacting protein ‎surfaces is always stronger compared to the pattern match between two different, ‎promiscuous protein surfaces. This finding implies possible single-shot selection of ‎homodimers (i.e. permanently bound, functional pairs of identical proteins) in the ‎course of early evolution. Our simple model of early evolutionary selection of ‎interacting proteins accurately reproduces the experimental data on homodimer ‎interface aminoacid compositions. In addition, we predict that heterodimers (i.e. ‎functional pai rs of different proteins) evolved from homodimers with the negative ‎design evolutionary pressure applied against promiscuous homodimer formation. We ‎predict that the anti-homodimer negative design evolutionary signal is conveyed ‎through the enrichment of heterodimeric interfaces in polar residues, and most ‎profoundly in glutamic acid and lysine, which is consistent with experimental ‎findings. We predict therefore that the negative design against homodimers is the ‎origin of the observed, highly conserved polar “hot spots” on heterodimeric ‎interfaces.‎ From ramyb at bgu.ac.il Wed Mar 15 10:00:48 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-16 Physics Colloquium Message-ID: <200603150800.KAA158416235@tzin.bgu.ac.il> Physics Colloquium DATE: 16-03-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Wells nano-dots and nano-crystals SPEAKER: Dr. Y. Paltiel, Solid state physics group, Soreq Nuclear Research Center ABSTRACT/COMMENTS: UPGRADED REFRESHMENTS! are served at 3:20pm, thanks to Ilan Barboy and to the dpeartment chair, Prof. Y. Horowitz Abstract: Nano technology is in the center of attention in the last decade. In our work we are using nano and quantum physics to study and fabricate infrared devices. The relations between the quantum and the macroscopic world are not trivial and many quantum phenomenons could influence macroscopic measurements. In this talk I will show some of the infrared devices we are studying, and try to present the rich physics and relations that combine between the two worlds. From kletter at bgu.ac.il Wed Mar 15 12:28:26 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-16 NLD seminar - reminder Message-ID: A Nonlinear Dynamics seminar on: Dam breaking by catastrophic erosional incision Speaker: Dr. Jost von Hardenberg CIMA, Universita; degli Studi di Genova, Italy Tomorrow, March 16 2006 at 11:00, the Physics club (room 002, building 29). For abstract, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html ================================== Assaf Kletter, PhD student Department of Physics Ben-Gurion University Beer Sheva 84105, Israel. Phone: +972-8-6472132 http://physics.bgu.ac.il/~kletter -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060315/9263a168/attachment.htm From band at bgu.ac.il Wed Mar 15 12:29:22 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-22 Physical Chemistry Seminar Message-ID: <200603151029.MAA158933552@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 22-03-2006 TIME: 4:00pm (Wed) PLACE: Building 28, room 104 TITLE: Neutron Scattering, Quantum Entanglement and the Chemical Formula of Water SPEAKER: Raymond Moreh, Ben-Gurion University ABSTRACT/COMMENTS: We performed new measurements to test allegations in a long series of papers claiming that the n-p scattering cross section from H-containing compounds (e.g. H2O) drops by 40% for neutron energies 10 eV - 200 eV. This anomaly was interpreted in terms of quantum entanglement of the two protons in H2O and a change in the chemical formula of H2O at time scales of 10{^-15} sec. The results of our experiments revealed no anomalies. References: Moreh, Danon, Block, Neuman, PRL 94 (2005) 185301. Moreh, Danon, Block, Neuman, PRL 96 (2006) 055302. From kletter at bgu.ac.il Wed Mar 15 14:38:01 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-23 No NLD seminar Message-ID: There will not be a NLD seminar next week (23/3) due to the MABR workshop. http://www.bgu.ac.il/mabr06 For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html ================================== Assaf Kletter, PhD student Department of Physics Ben-Gurion University Beer Sheva 84105, Israel. Phone: +972-8-6472132 http://physics.bgu.ac.il/~kletter -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060315/0a8c1680/attachment.htm From nano at bgu.ac.il Sun Mar 19 21:53:30 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-22 nanotechnology workshop Message-ID: <004501c64b8e$cc205cb0$1b0e4884@estinano> There will not be a seminar this Wednesday 22/03/06 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060319/1cfdc13e/attachment.htm From nano at bgu.ac.il Sun Mar 19 22:11:27 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-26 nanotechnology SPECIAL SEMINAR Message-ID: <006201c64b91$4e164020$1b0e4884@estinano> *Please note the date! Nanotechnology workshop, Sunday March 26, 12:00 Chemical Engineering Department seminar room (building 29, room 306,Chemistry Department seminar room) Title : DNA and RNA unzipping using nanopore force spectroscopy Speaker: Amit Meller Rowland Institute at Harward -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060319/a1f466d1/attachment.htm From nano at bgu.ac.il Sun Mar 19 23:28:51 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-26 nanotechnology SPECIAL SEMINAR- correction Message-ID: <000e01c64b9c$1dc10c10$1b0e4884@estinano> *Please note the date! Nanotechnology workshop, Sunday March 26, 12:00 Chemistry Department seminar room-building 29, room 306 Title : DNA and RNA unzipping using nanopore force spectroscopy Speaker: Amit Meller Rowland Institute at Harward -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060319/a8cc1b7f/attachment.htm From Shuker at bgu.ac.il Tue Mar 21 13:54:34 2006 From: Shuker at bgu.ac.il (Shuker@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-29 Joint Lasers and Chem. Phys. Seminar Message-ID: <200603211154.NAA165708679@tzin.bgu.ac.il> Joint Lasers and Chem. Phys. Seminar DATE: 29-03-2006 TIME: 16: 00 (Wed) NOTE CHANGE DAY AND TIME PLACE: Bldg. 29, Room 306 (Seminar Room) NOTE CHANGE TITLE: Interference between fluctuating condensates SPEAKER: Dr Ehud Altman, Weizmann Institute ABSTRACT/COMMENTS: Two independent Bose condensates that are released from their traps and let to overlap produce a sharp interference pattern. How does this picture change if each condensate lacks true long range order? From kletter at bgu.ac.il Tue Mar 21 23:30:49 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-30 NLD seminar Message-ID: An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060321/356d5add/attachment.htm -------------- next part -------------- A non-text attachment was scrubbed... Name: Provenzale.pdf Type: application/pdf Size: 7119 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060321/356d5add/Provenzale.pdf From band at bgu.ac.il Wed Mar 22 07:41:09 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-29 Physical Chemistry Seminar Message-ID: <200603220541.HAA166407422@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 29-03-2006 TIME: 4:00pm (Wed) PLACE: Building 28, room 104 TITLE: Interference between fluctuating condensates SPEAKER: Ehud Altman, Weizmann Institute ABSTRACT/COMMENTS: Two independent Bose condensates that are released from their traps and let to overlap produce a sharp interference pattern. How does this picture change if each condensate lacks true long range order? I will show that the interference pattern then contains non-trivial information about the correlations within each condensate. As an example I will analyze the interference of one and two dimensional interacting Bose liquids. The average fringe contrast scales as a universal power of the length, that in 1d (at sufficiently low temperature) depends only on the Luttinger parameter, and in 2d on the renormalized phase stiffness. This prediction has recently been used to identify the Kosterlitz-Thouless transition in a set of beautiful experiments at ENS. Finally I will show that the full distribution function of fringe amplitudes is related to the partition function for a quantum impurity in a one-dimensional Luttinger liquid and can be calculated explicitly using methods of conformal field theory. From ramyb at bgu.ac.il Wed Mar 22 08:38:40 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-23 Physics Colloquium Message-ID: <200603220638.IAA165724519@tzin.bgu.ac.il> Physics Colloquium DATE: 23-03-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Chemotaxis Or How Organisms Decide Where To Go SPEAKER: , Prof. Y. Meir Department of Physics, Ben-Gurion University ABSTRACT/COMMENTS: Upgraded Refreshments ! are served at 3:20pm come early so you can enjoy them. Our very own Prof. Yigal Meir will be the speaker on a subject that has become one of the new frontiers in science in general and physics in particular: quantitative biology. Abstract: Organisms are faced all the time by multiple signals, which they have to process in order to decide in which direction to move, if at all. The biological network responsible for assembling the data, processing them and then making the actual movement is called the chemotaxis network. This network has been very well characterized in simple organisms, such as bacteria, and is remarkable for its sensitivity to small relative changes in the concentrations of multiple chemical signals, and its level of adaptation. This talk introduces this sophisticated biological network, and its basic elements. A model is then introduced for the signal integration which has some similarity to the Ising model, describing spins on a lattice. Our model results compare favorably to the experimental results obtained by Sourjik and Berg. From jung at bgu.ac.il Wed Mar 22 09:09:32 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-27 Condensed Matter Seminar Message-ID: <200603220709.JAA165255901@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 27-03-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: MEMORY IN NANO MAGNETIC PARTICLES. SPEAKER: Sushanta Dattagupta , S N Bose National Centre for Basic Sciences Salt Lake City Kolkata 700 098, INDIA ABSTRACT/COMMENTS: From kletter at bgu.ac.il Thu Mar 23 00:26:07 2006 From: kletter at bgu.ac.il (kletter@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-23 NO NLD seminar - reminder Message-ID: We would like to remind you that tomorrow there will not be a NLD seminar, due to the workshop on MABR, http://www.bgu.ac.il/mabr06. We will meet again next week, as posted. For abstracts, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060322/c9c7339d/attachment.htm From band at bgu.ac.il Thu Mar 23 14:22:21 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-29 Physical Chemistry Seminar -correction Message-ID: <200603231222.OAA168039464@tzin.bgu.ac.il> Physical Chemistry Seminar -correction DATE: 29-03-2006 TIME: 4:00pm (Wed) PLACE: Building 29, room 306 - note correction TITLE: Interference between fluctuating condensates SPEAKER: Ehud Altman, Weizmann Institute ABSTRACT/COMMENTS: Two independent Bose condensates that are released from their traps and let to overlap produce a sharp interference pattern. How does this picture change if each condensate lacks true long range order? I will show that the interference pattern then contains non-trivial information about the correlations within each condensate. As an example I will analyze the interference of one and two dimensional interacting Bose liquids. The average fringe contrast scales as a universal power of the length, that in 1d (at sufficiently low temperature) depends only on the Luttinger parameter, and in 2d on the renormalized phase stiffness. This prediction has recently been used to identify the Kosterlitz-Thouless transition in a set of beautiful experiments at ENS. Finally I will show that the full distribution function of fringe amplitudes is related to the partition function for a quantum impurity in a one-dimensional Luttinger liquid and can be calculated explicitly using methods of conformal field theory. From nano at bgu.ac.il Sun Mar 26 22:10:14 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-29 nanotechnology workshop Message-ID: <003801c65111$4c76b620$1b0e4884@estinano> Nanotechnology workshop, Wednesday March 29, 12:00 building 29, room 306,Chemistry Department seminar room Title : Temporal Fluctuations of Gene Activity in the Lambda Phage Induction Cascade A Systems Biology View Speaker: Yoel Stavans Weizmann Institute of Science -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060326/5f30b35e/attachment.htm From band at bgu.ac.il Mon Mar 27 19:46:34 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-04 Joint Physical Chemistry Laser Seminar Message-ID: <200603271746.TAA172335066@tzin.bgu.ac.il> Joint Physical Chemistry Laser Seminar DATE: 04-04-2006 TIME: 3:30 pm (Tuesday) - Note change PLACE: Physics club (Building 29, room 002) TITLE: Intermolecular Coulombic Deacy SPEAKER: Professor Lorenz Cederbaum , Heidelberg University ABSTRACT/COMMENTS: In contrast to core levels which decay by the Auger process, inner- valence levels of atoms and molecules are stable against emission of electrons. The situation changes drastically once the atom or molecule are embedded in an environment, for instance, are a member of a cluster. The process I will discuss is an ultrafast energy transfer with many consequences. In the meantime, the theoretical prediction of the Intermolecular Coulombic Deacy has been verified experimentally. Several illuminating experiments will be discussed as well. References L. S. Cederbaum, J. Zobeley and F. Tarantelli, Phys. Rev. Lett. 79 (1997), 4778 R. Santra, J. Zobeley, L. S. Cederbaum and N. Moiseyev, Phys. Rev. Lett. 85 (2000), 4490 R. Santra and L. S. Cederbaum, Phys. Rev. Lett. 90 (2003), 153401 V. Averbukh, I. B. Müller and L. S. Cederbaum, Phys. Rev. Lett. 93 (2004), 263002 V. Averbukh and L. S. Cederbaum, Phys. Rev. Lett. 96 (2006), 053401 From shuker at bgu.ac.il Mon Mar 27 23:12:07 2006 From: shuker at bgu.ac.il (shuker@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-04 Lasers Seminar Message-ID: <200603272112.XAA171934113@tzin.bgu.ac.il> Lasers Seminar DATE: 04-04-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Intermolecular Coulombic Deacy SPEAKER: Professor Lorenz Cederbaum, Heidelberg University ABSTRACT/COMMENTS: In contrast to core levels which decay by the Auger process, inner- valence levels of atoms and molecules are stable against emission of electrons. The situation changes drastically once the atom or molecule are embedded in an environment, for instance, are a member of a cluster. The process I will discuss is an ultrafast energy transfer with many consequences. In the meantime, the theoretical prediction of the Intermolecular Coulombic Deacy has been verified experimentally. Several illuminating experiments will be discussed as well. References L. S. Cederbaum, J. Zobeley and F. Tarantelli, Phys. Rev. Lett. 79 (1997), 4778 R. Santra, J. Zobeley, L. S. Cederbaum and N. Moiseyev, Phys. Rev. Lett. 85 (2000), 4490 R. Santra and L. S. Cederbaum, Phys. Rev. Lett. 90 (2003), 153401 V. Averbukh, I. B. M?ller and L. S. Cederbaum, Phys. Rev. Lett. 93 (2004), 263002 V. Averbukh and L. S. Cederbaum, Phys. Rev. Lett. 96 (2006), 053401 From nano at bgu.ac.il Tue Mar 28 21:17:55 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-29 nanotechnology workshop- REMINDER Message-ID: <001a01c6529c$511208b0$1b0e4884@estinano> Nanotechnology workshop, Wednesday March 29, 12:00 building 29, room 306,Chemistry Department seminar room Title : Temporal Fluctuations of Gene Activity in the Lambda Phage Induction Cascade A Systems Biology View Speaker: Yoel Stavans Weizmann Institute of Science -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060328/73634ca3/attachment.htm From ramyb at bgu.ac.il Wed Mar 29 09:51:28 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-30 Physics Colloquium Message-ID: <200603290751.JAA173394539@tzin.bgu.ac.il> Physics Colloquium DATE: 30-03-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Smuggling the border between nanoelectronics and molecular biology SPEAKER: Prof. U. Sivan, Department of Physics and the Russell Berrie Nanotechnology Institute, Technion ABSTRACT/COMMENTS: (Upgraded!) Refreshments are served at 3:20pm Abstract: Seamless integration of biology with nanoelectronics at the single molecule level may dramatically affect both fields. An electronic control over bio-reactions, for instance, may supplement biochemistry with the flexibility and computing power of silicon technology. A natural meeting point between these fields is at the most fundamental level of biochemistry; the molecular recognition process. In the talk I will present our efforts to develop antibodies that recognize the electrostatic potential presented to them by electronic materials, and control the binding between an antibody and its antigen by an electronic signal. Some questions concerning the interaction between the soft bio-molecules and the hard flat electronic surfaces will be discussed. From jung at bgu.ac.il Wed Mar 29 10:29:11 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-03 Condensed Matter Seminar Message-ID: <200603290829.KAA172801609@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 03-04-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Collective Spin Dynamics in Clusters SPEAKER: Gregory Furman, Physics Department Ben Gurion University ABSTRACT/COMMENTS: Multiple-quantum spin dynamics is used to creating the highest-order multiple-quantum coherence and to prepare a pseudopure state of the spin system. Important applications of collective spin dynamics for quantum amplification and for spin state transferring are consider. A number of simple examples are analyzed. From band at bgu.ac.il Wed Mar 29 10:34:21 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-05 Physical Chemistry Seminar Message-ID: <200603290834.KAA174118782@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 05-04-2006 TIME: 4:00 PM (Wed) PLACE: Chemistry club (Building 29, room 306) TITLE: One-mirror Fabry-Perot interferometer SPEAKER: Dr. Daniel Rohrlich, Ben-Gurion University ABSTRACT/COMMENTS: We describe a new and distinctive interferometry in which a probe particle scatters off a superposition of locations of a single free target particle. In one dimension, probe particles incident on superposed locations of a single \"mirror\" can interfere as if in a Fabry-Perot interferometer; in two dimensions, probe particles scattering off superposed locations of a single \"slit\" can interfere as if in a two-slit Young interferometer. The condition for interference is loss of orthogonality of the target states and reduces, in simple examples, to transfer of orthogonality from target to probe states. We analyze experimental parameters and conditions necessary for interference to be observed. From kletter at bgu.ac.il Wed Mar 29 11:40:06 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-06 NLD seminar Message-ID: A Nonlinear Dynamics seminar on: Visco-plastic Deformation in Dynamic Fracture of Amorphous Materials Speaker: Mr. Eran Bouchbinder Chemical Physics Department, Weizmann Inst. Thursday, April 06 2006 at 11:00, the Physics club (room 002, building 29). ABSTRACT attached. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From kletter at bgu.ac.il Wed Mar 29 11:42:26 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-06 NLD seminar Message-ID: A Nonlinear Dynamics seminar on: Visco-plastic Deformation in Dynamic Fracture of Amorphous Materials Speaker: Mr. Eran Bouchbinder Chemical Physics Department, Weizmann Inst. Thursday, April 06 2006 at 11:00, the Physics club (room 002, building 29). ABSTRACT attached. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html -------------- next part -------------- A non-text attachment was scrubbed... Name: Bouchbinder.pdf Type: application/pdf Size: 7794 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060329/de1d8169/Bouchbinder.pdf From nano at bgu.ac.il Wed Mar 29 00:08:20 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-05 nanotechnology workshop Message-ID: <000101c652b6$fd27b040$1b0e4884@estinano> Nanotechnology workshop, Wednesday April 05, 12:00 building 29, room 306,Chemistry Department seminar room Title : Agglomeration strength of nanoparticles Speaker: Yoed Tsur Technion -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060329/d49eb2a1/attachment.htm From kletter at bgu.ac.il Wed Mar 29 13:11:47 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-03-30 NLD seminar - reminder Message-ID: A Nonlinear Dynamics seminar on: Nonlinear dynamics of turbulent convective plumes Speaker: Dr. Antonello Provenzale ISAC-CNR, Turin, Italy Tomorrow, March 30 2006 at 11:00, the Physics club (room 002, building 29). For abstract, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From shuker at bgu.ac.il Wed Mar 29 14:52:36 2006 From: shuker at bgu.ac.il (shuker@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-25 Lasers Seminar Message-ID: <200603291252.OAA174909959@tzin.bgu.ac.il> Lasers Seminar DATE: 25-04-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: A Computational Fluid Dynamics simulation of a supersonic COIL laser SPEAKER: Dr Karol Waichman, Physics Department, BGU ABSTRACT/COMMENTS: A high-efficiency Chemical Oxygen-Iodine Laser (COIL) was developed in our laboratory. The processes underlying the COIL gasdynamics and chemistry are not fully understood and thus a theoretical model was required. A 3D simulation model was developed based on the Fluent CFD solver. The model solves the full Navier-Stokes conservation equations coupled with the species transport which is the result of chemical reactions and multicomponent diffusion. The simulation results were compared to the experimental I2 concentration and laser gain measurements. The good fit between the experiment and the simulation enabled reliable estimation of O2 concentration which was experimentally unaccesible. From shuker at bgu.ac.il Sat Apr 1 23:53:24 2006 From: shuker at bgu.ac.il (shuker@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-05-09 Lasers Seminar Message-ID: <200604012053.XAA3649078@tzin.bgu.ac.il> Lasers Seminar DATE: 09-05-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: HIGH POWER RADIATION SOURCES FROM MICROWAVES TO X-RAYS. SPEAKER: Professor Avi Gover, School of Engineering Tel Aviv University ABSTRACT/COMMENTS: From hbaruch at bgu.ac.il Sun Apr 2 19:38:31 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-05 Condensed Matter Seminar -Special Message-ID: <200604021638.TAA4612706@tzin.bgu.ac.il> Condensed Matter Seminar -Special DATE: 05-04-2006 TIME: 11:00am Wednesday -- note special time PLACE: Physics club (Building 29, room 002) TITLE: Interacting electrons in disordered quantum wires: Localization and dephasing SPEAKER: Prof. Alexander Mirlin , Forschungszentrum and University of Karlsruhe, Germany ABSTRACT/COMMENTS: From nano at bgu.ac.il Sun Apr 2 21:04:55 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-05 nanotechnology workshop- Abstract Message-ID: <001601c6567f$f2468120$1b0e4884@estinano> Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: Yoed_abstract_BGU06.doc Type: application/msword Size: 25088 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060402/ccd6b19a/Yoed_abstract_BGU06.doc From ramyb at bgu.ac.il Tue Apr 4 14:06:11 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-06 Physics Colloquium Message-ID: <200604041106.OAA6669534@tzin.bgu.ac.il> Physics Colloquium DATE: 06-04-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: SPEAKER: Prof. S. Dattagupta, S N Bose National Centre for Basic Sciences Salt Lake City Kolkata, INDIA ABSTRACT/COMMENTS: (Upgraded) Refreshments are served at 3:20pm Abstract: A quantum system, which is otherwise coherent, starts behaving like a classical system when it is put in contact with a large environment. This quantal to classical crossover is an interesting topical issue in many areas, including condensed matter physics. In the latter subject, an old problem is that of Landau Diamagnetism (LD), exhibited by a statistical collection of electrons moving in a magnetic field. LD is a purely quantum phenomenon. What happens when the electrons additionally interact with a dissipative bath? We will examine this question within both Einstein and Gibbs approaches to statistical physics. The result is that LD goes over to Bohr-Van Leeuwen (BV)like expression when the environmental coupling is strong. The role of the confining boundary within which the electrons move will be examined, interalia, in this LD to BV transition. From jung at bgu.ac.il Wed Apr 5 08:57:28 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-24 Condensed Matter Seminar Message-ID: <200604050557.IAA7592437@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 24-04-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Thermodynamic first-order melting and second-order glass ‎transitions of vortices in high-temperature superconductors SPEAKER: Haim Beidenkopf, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel ABSTRACT/COMMENTS: Vortex matter in high temperature superconductors enables the study of systems of ‎interacting particles at finite temperatures in the presence of quenched disorder. At low ‎temperatures, however, where the disordering potential becomes dominant, the magnetic response ‎falls out of equilibrium and the measured local magnetization M(H,T) becomes hysteretic. We ‎thus studied the B-T phase diagram of the vortex matter in Bi2Sr2CaCu2O8+y while employing a ‎vortex shaking method to suppress irreversibility and relax the vortices toward their equilibrium ‎configuration even at low temperatures. As a result, we detect both a first-order inverse-melting ‎transition and a novel thermodynamic glass transition of second-order [1]. The emerging phase ‎diagram consists of liquid, glassy, quasi-ordered and (presumably) ordered vortex phases. Within ‎the talk I will discuss the competing energy scales that give rise to such a rich phase diagram. I ‎will further describe the scaling of the transition lines with varying sample anisotropy, and what ‎does this scaling tell us about the physics involved.‎ ‎1. H. Beidenkopf et al., Phys. Rev. Lett. 95, 257004 (2005).‎ From ramyb at bgu.ac.il Thu Apr 6 10:03:17 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-06 Physics Colloquium Message-ID: <200604060703.KAA8843377@tzin.bgu.ac.il> Physics Colloquium DATE: 06-04-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Dissipative Diamagnetism SPEAKER: Prof. S. Dattagupta, S N Bose National Centre for Basic Sciences Salt Lake City Kolkata, INDIA ABSTRACT/COMMENTS: Today! (Upgraded) Refreshments are served at 3:20pm Don\'t miss the last colloquium before the PESACH holiday! From SHUKER at bgu.ac.il Thu Apr 6 10:26:21 2006 From: SHUKER at bgu.ac.il (SHUKER@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-25 Lasers Seminar Message-ID: <200604060726.KAA8906758@tzin.bgu.ac.il> Lasers Seminar DATE: 25-04-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: NOTE CHANGE OF THE SEMINAR TITLE AND SPEAKER \"Coherence and interferometry with low dimensional Bose gases\". SPEAKER: Dr Peter Kruger, Ecole Normal Superior Paris, FRANCE ABSTRACT/COMMENTS: From SHUKER at bgu.ac.il Thu Apr 6 10:38:26 2006 From: SHUKER at bgu.ac.il (SHUKER@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-06-06 Lasers Seminar Message-ID: <200604060738.KAA7975966@tzin.bgu.ac.il> Lasers Seminar DATE: 06-06-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: A Computational Fluid Dynamics simulation of a supersonic COIL laser SPEAKER: Dr Karol Waichman, Physics Department BGU ABSTRACT/COMMENTS: A high-efficiency Chemical Oxygen-Iodine Laser (COIL) was developed in our laboratory. The processes underlying the COIL gasdynamics and chemistry are not fully understood and thus a theoretical model was required. A 3D simulation model was developed based on the Fluent CFD solver.The model solves the full Navier-Stokes conservation equations coupled with the species transport which is the result of chemical reactions and multicomponent diffusion. The simulation results were compared to the experimental I2 concentration and laser gain measurements. The good fit between the experiment and the simulation enabled reliable estimation of O2 concentration which was experimentally unaccesible. From kletter at bgu.ac.il Sun Apr 9 13:06:39 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-20 No NLD seminar Message-ID: We will not have a seminar on April 20, 2006. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From kletter at bgu.ac.il Thu Apr 20 10:29:33 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-27 NLD seminar Message-ID: A Nonlinear Dynamics seminar on: Feedback control of subcritical oscillatory instabilities Speaker: Dr. Alexander Nepomnyashchy Department of Mathematics, Technion Thursday, April 27 2006 at 11:00, the Physics club (room 002, building 29). ABSTRACT attached. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html -------------- next part -------------- A non-text attachment was scrubbed... Name: Nepomnyashchy.pdf Type: application/pdf Size: 3932 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060420/108a1c79/Nepomnyashchy.pdf From band at bgu.ac.il Thu Apr 20 12:04:59 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-25 Joint Physical Chemistry-LasersSeminar Message-ID: <200604200904.MAA24519603@tzin.bgu.ac.il> Joint Physical Chemistry-LasersSeminar DATE: 25-04-2006 TIME: 3:30 PM (Tuesday) - note special time PLACE: Chemistry club (Building 29, room 306) TITLE: \"Coherence and interferometry with low dimensional Bose gases\" SPEAKER: Dr. Peter Kruger, Ecole Normal Superior Paris, FRANCE ABSTRACT/COMMENTS: From band at bgu.ac.il Thu Apr 20 12:55:03 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-05-10 Physical Chemistry Seminar Message-ID: <200604200955.MAA24506855@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 10-05-2006 TIME: 4:00 PM (Wed) PLACE: Chemistry club (Building 29, room 306) TITLE: Quantum excitations of matter-wave solitons SPEAKER: Ami Vardi, Ben-Gurion University ABSTRACT/COMMENTS: Thermal excitations and BEC depletion affect the dynamics of matter-wave solitons. Using a time-dependent Hartree-Fock-Bogoliubov formalism we show that a matter-wave bright soliton collapses via a pairing instability into two correlated solitonic structures, consisting mutually trapped condensed- and thermal atoms. The origin of this phenomenon and its relation to exchange symmetry will be discussed. From SHUKER at bgu.ac.il Thu Apr 20 15:37:39 2006 From: SHUKER at bgu.ac.il (SHUKER@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-05-10 Lasers and Chem. Phys. Seminar Message-ID: <200604201237.PAA24678583@tzin.bgu.ac.il> Lasers and Chem. Phys. Seminar DATE: 10-05-2006 TIME: 16: 00 (Wed) NOTE CHANGE DAY AND TIME PLACE: Bldg. 29, Room 306 (Seminar Room) NOTE CHANGE TITLE: Quantum excitations of matter-wave solitons SPEAKER: Dr. Ami Vardi, Ben-Gurion University, ABSTRACT/COMMENTS: Thermal excitations and BEC depletion affect the dynamics of matter-wave solitons. Using a time-dependent Hartree-Fock-Bogoliubov formalism we show that a matter-wave bright soliton collapses via a pairing instability into two correlated solitonic structures, consisting mutually trapped condensed- and thermal atoms. The origin of this phenomenon and its relation to exchange symmetry will be discussed. From band at bgu.ac.il Thu Apr 20 16:27:25 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-25 Joint Physical Chemistry-Laser Seminar Message-ID: <200604201327.QAA24805711@tzin.bgu.ac.il> Joint Physical Chemistry-Laser Seminar DATE: 25-04-2006 TIME: 3:30 PM (Tuesday) - note special time PLACE: Physics club (Building 29, room 002) TITLE: Coherence and interferometry with low dimensional Bose gases SPEAKER: Dr Peter Kruger, Ecole Normal Superior, Paris, FRANCE ABSTRACT/COMMENTS: From jung at bgu.ac.il Fri Apr 21 12:46:31 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-24 Condensed Matter Seminar Message-ID: <200604210946.MAA25641284@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 24-04-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Thermodynamic first-order melting and second-order glass transitions of vortices in high-temperature superconductors SPEAKER: Haim Beidenkopf, Department of Condensed Matter Physics, Weizmann Institute of Science ABSTRACT/COMMENTS: The vortex matter in high temperature superconductors enables the study of systems of interacting particles at finite temperatures in the presence of quenched disorder. At low temperatures, however, where the disordering potential becomes dominant, the magnetic response falls out of equilibrium and the measured local magnetization M(H,T) becomes hysteretic. We thus studied the B-T phase diagram of the vortex matter in Bi2Sr2CaCu2O8+, while employing a vortex shaking method to suppress irreversibility and relax the vortices toward their equilibrium configuration even at low temperatures. As a result, we detect both a first-order inverse-melting transition and a novel thermodynamic glass transition of second-order [1]. The emerging phase diagram consists of liquid, glassy, quasi-ordered and (presumably) ordered vortex phases. Within the talk I will discuss the competing energy scales that give rise to such a rich phase diagram. I will further describe the scaling of the transition lines with varying sample anisotropy, and what does this scaling tell us about the physics involved. 1. H. Beidenkopf et al., Phys. Rev. Lett. 95, 257004 (2005). From physics at bgu.ac.il Tue Apr 25 12:47:02 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-27 Physics Colloquium Message-ID: <200604250947.MAA30295158@tzin.bgu.ac.il> Physics Colloquium DATE: 27-04-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Cosmology with vacuum energy and child universes SPEAKER: Prof. E. Guendelman, Department of Physics, Ben-Gurion University ABSTRACT/COMMENTS: General Notions of Cosmology are reviewed. The role of Vacuum Energy in the Early Universe Accelerated Expansion (Inflation) and for the present universe, also known to be accelerated, will be discussed. The notion of \"local inflation\" of a vacuum bubble leads naturally to the \"child universe\" solutions, where a new universe is created which eventually disconnects from the \'parent\' one. The role of solitons, like magnetic monopoles and others for the creation of a universe in the \'laboratory\', both at the classical and quantum level, will be discussed. The basic \'engine\' that makes possible and governs all these processes is the vacuum energy. We end with some comment regarding some new approaches to the so called \'cosmological constant problem\' which consists of the problem of how to explain the tremendous difference between the vacuum energy now and in the early universe. From physics at bgu.ac.il Tue Apr 25 12:49:48 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-27 Physics Colloquium Message-ID: <200604250949.MAA30324689@tzin.bgu.ac.il> Physics Colloquium DATE: 27-04-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Cosmology with vacuum energy and child universes SPEAKER: Prof. E. Guendelman, Department of Physics, Ben-Gurion University ABSTRACT/COMMENTS: General Notions of Cosmology are reviewed. The role of Vacuum Energy in the Early Universe Accelerated Expansion (Inflation) and for the present universe, also known to be accelerated, will be discussed. The notion of \"local inflation\" of a vacuum bubble leads naturally to the \"child universe\" solutions, where a new universe is created which eventually disconnects from the \'parent\' one. The role of solitons, like magnetic monopoles and others for the creation of a universe in the \'laboratory\', both at the classical and quantum level, will be discussed. The basic \'engine\' that makes possible and governs all these processes is the vacuum energy. We end with some comment regarding some new approaches to the so called \'cosmological constant problem\' which consists of the problem of how to explain the tremendous difference between the vacuum energy now and in the early universe. From hbaruch at bgu.ac.il Wed Apr 26 13:09:24 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-30 Condensed Matter Seminar - Special Message-ID: <200604261009.NAA31534030@tzin.bgu.ac.il> Condensed Matter Seminar - Special DATE: 30-04-2006 TIME: 11:30am Sunday -- note special time PLACE: Physics club (Building 29, room 002) TITLE: Dynamics of the intracellular fluid in rapidly moving cells SPEAKER: Dr. Kinneret Keren, Biochemistry Department, Stanford University, U.S.A. ABSTRACT/COMMENTS: Molecular mechanisms and biophysical processes are intimately intertwined to generate the robust large-scale self-organization manifested by a moving cell. While much research has been devoted to the molecular mechanisms underlying cell motility, less is known about its biophysical aspects such as the intracellular fluid dynamics. To study fluid dynamics in moving cells we introduce polyethylene glycol-coated quantum dots and GFP as inert fluorescent tracers into cells and follow their motion by both spatio temporal image correlation spectroscopy and single particle tracking. We find that moving cells exhibit a directed fluid flow (in the cell frame of reference) in the lamellipodium away from the cell\'s leading edge and back towards the cell body at a speed of ~40% of the cell movement speed. We present a theoretical model for fluid flow in moving cells that accurately describes our experimental results. We show that fluid flow plays an important role in the protrusion proc ess by generating hydrodynamic forces that oppose the membrane load and thus increase the rate of actin polymerization at a protruding edge. The observed flow actually lowers concentrations of soluble proteins such as actin monomers at the leading edge. However, we find that the availability of proteins is not rate limiting for cell motility and simple diffusion is sufficient for transport of components to the leading edge even in rapidly moving cells. From hbaruch at bgu.ac.il Wed Apr 26 13:16:57 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-30 Condensed Matter Seminar -Special Message-ID: <200604261016.NAA30483317@tzin.bgu.ac.il> Condensed Matter Seminar -Special DATE: 30-04-2006 TIME: 14:00pm Sunday - note special time PLACE: Physics club (Building 29, room 002) TITLE: The Vortex Lattice in High Temperature Superconductors: Thermal Depinning, Melting, and Nonlocal Elasticity SPEAKER: Prof. E. Helmut Brandt, Max-Planck Institut fuer Metallforschung, Stuttgart, Germany ABSTRACT/COMMENTS: Type-II superconductors like Nobium and many alloys allow magnetic flux to penetrate in form of magnetic flux lines, i.e., vortices of the supercurrent, each vortex carrying one quantum of magnetic flux. This effect was predicted in 1957 by Alexei Abrikosov, who got for this the Nobel Prize in Physics 2003. Abrikosov flux lines arrange to a more or less perfect triangular vortex lattice that exhibits interesting non-local elasticity and structural defects. It may be plastically deformed or amorphous, and it may even melt into a \"vortex liquid\". The vortex lattice can be observed by decoration, magneto-optics, neutron scattering, and globally by measuring the magnetization curves and electromagnetic response. Under the action of an applied electric current, the vortices can move and dissipate energy. This undesired vortex drift is suppressed by introducing material inhomogeneities that pin the vortices. Vortex pinning is crucial for the application of superconductors as loss-free conductors or in magnet coils. In High-Temperature Superconductors (oxides) the vortices may depin by thermal activation, which causes a non-zero and typically nonlinear resistivity, even at low current densities. These oxides have layered structure: Each vortex line is thus composed of vortex disks sitting in the superconducting CuO layers and being connected by vortex segments which have their core between the layers (\"pancakes\" and \"Josephson strings\"). In typical measurements of the magnetic response, the super- conductor is a thin platelet or film exposed to a PERPENDICULAR magnetic field. Up to quite recently, appropriate theories for the evaluation of such experiments were not available but one resorted to theories which were derived for long slabs or cylinders in PARALLEL field. For real specimen shapes one used corrections by a demagnetization factor, but this works only for homogeneous specimens with elliptical shape and linear response. Recent exact analytical results describe the STATICS of thin disks and strips in a perpendicular magnetic field. Analytical and numerical methods yield the DYNAMICS of the magnetic flux in superconducting thin and thick strips, disks, rings, and rectangular platelets, treated as conductors with non-linear resistivity. From kletter at bgu.ac.il Wed Apr 26 15:06:30 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-27 NLD seminar - reminder Message-ID: A Nonlinear Dynamics seminar on: Feedback control of subcritical oscillatory instabilities Speaker: Dr. Alexander Nepomnyashchy Department of Mathematics, Technion Tomorrow, April 27 2006 at 11:00, the Physics club (room 002, building 29). For abstracts, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From ramyb at bgu.ac.il Wed Apr 26 15:57:39 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-27 Physics Colloquium Message-ID: <200604261257.PAA31867283@tzin.bgu.ac.il> Physics Colloquium DATE: 27-04-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Cosmology with vacuum energy and child universes SPEAKER: Prof. E. Guendelman, Department of Physics, Ben-Gurion University ABSTRACT/COMMENTS: Tomorrow! a local speaker and upgraded refreshments! Prof. Guendelman will discuss the cosmological constant, one of the biggest mysteries in science. Refreshments are served at 3:20pm Abstract: The role of Vacuum Energy in the Early Universe Accelerated Expansion (Inflation) and for the present universe, also known to be accelerated, will be discussed. The notion of \"local inflation\" of a vacuum bubble leads naturally to the \"child universe\" solutions, where a new universe is created which eventually disconnects from the \'parent\' one. The role of solitons, like magnetic monopoles and others for the creation of a universe in the \'laboratory\', both at the classical and quantum level, will be discussed. The basic \'engine\' that makes possible and governs all these processes is the vacuum energy. We end with some comment regarding some new approaches to the so called \'cosmological constant problem\' which consists of the problem of how to explain the tremendous difference between the vacuum energy now and in the early universe. From kletter at bgu.ac.il Wed Apr 26 17:31:30 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-05-04 NLD seminar Message-ID: A Nonlinear Dynamics seminar on: Phase compactons Speaker: Dr. Arkady Pikovsky Department of Physics, Universit?t Potsdam, Germany Thursday, May 04 2006 at 11:00, the Physics club (room 002, building 29). ABSTRACT attached. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html -------------- next part -------------- A non-text attachment was scrubbed... Name: Pikovsky.pdf Type: application/pdf Size: 3538 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060426/5ecde136/Pikovsky.pdf From jung at bgu.ac.il Thu Apr 27 10:09:28 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-05-01 Condensed Matter Seminar Message-ID: <200604270709.KAA32609713@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 01-05-2006 TIME: 12:00 (Mon) - note the time change PLACE: Physics club (Building 29, room 002) TITLE: Unknown quantum Hall effect (after 25 years of discovery) SPEAKER: Prof. Issai Shlimak, Department of Physics Bar-Ilan University ABSTRACT/COMMENTS: Discovery of the quantum Hall effect (QHE) in 1980 in Si-MOSFET is recognized as one of the most remarkable achievements in the solid state physics in the previous century. Since that time, plenty of works were devoted to investigations of QHE in different two-dimensional (2D) systems. Nevertheless, new features have been observed recently in the classical 2D system - Si-MOSFET. In the first part of the talk, the classical and quantum approach to the motion of 2D electrons in perpendicular electrical and strong magnetic fields is considered. We will discuss also the origin of the localized and delocalized states in a Landau band, as well as physical reasons for appearance of extended plateaus in the Hall resistance in disordered 2D systems. New effects - \"overshoot\" and \"dip\" - will be discussed at the end of the talk. From band at bgu.ac.il Thu Apr 27 11:55:15 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-05-17 Physical Chemistry Seminar Message-ID: <200604270855.LAA31585772@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 17-05-2006 TIME: 12:00 PM (Wed) PLACE: Chemistry club (Building 29, room 306) TITLE: Nonlinear Microscopy with Femtosecond pulses SPEAKER: Professor Yaron Silberberg, Weizmann Institute ABSTRACT/COMMENTS: Special Joint Physical Chemistry, Lasers and Nano Seminar From ramyb at bgu.ac.il Thu Apr 27 14:46:58 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-04-27 Physics Colloquium Message-ID: <200604271146.OAA32769539@tzin.bgu.ac.il> Physics Colloquium DATE: 27-04-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Cosmology with vacuum energy and child universes SPEAKER: Prof. E. Guendelman, Department of Physics, Ben-Gurion University ABSTRACT/COMMENTS: In a few minutes! + upgraded Refreshments are served at 3:20pm From shuker at bgu.ac.il Sun Apr 30 17:22:12 2006 From: shuker at bgu.ac.il (shuker@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-05-23 Lasers Seminar Message-ID: <200604301422.RAA35947358@tzin.bgu.ac.il> Lasers Seminar DATE: 23-05-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Fiber-Optics Sensors SPEAKER: Dr Haim Lotem, NRCN ABSTRACT/COMMENTS: Fiber-optics sensors are an important technology that continues to grow hand in hand with the mature photonics technology. The sensors are divided into two classes: Intrinsic sensors that use fiber as the sensing element, and Extrinsic sensors that use optical fiber to transmit signal from the sensing point to a remote controller. Both classes are being used in a wide variety of applications. For example, Sagnac interferometers, which can determine movement by measuring the shift in interference fringes from two counterpropagating coherent beams in a multi-turn fiber ring , support fiber gyros on aircraft, missiles, rockets, and robots. Mach-Zehnder interferometers, in which interference fringes indicate the length relationship between two arms of an interferometer, support strain and acoustics measurements. In my talk I will review both classes of fiber-optics sensors. In addition, recently developed THz Electric-field sensors based on Electro-Optical Polymer and a Multimode point pressure sensor based on Two-Mode Coupling will be discussed in a greater detail. From jung at bgu.ac.il Mon May 1 10:56:49 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-05-01 Condensed Matter Seminar Message-ID: <200605010756.KAA36824609@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 01-05-2006 TIME: 12:00(Mon) note the changed hour PLACE: Physics club (Building 29, room 002) TITLE: Unknown quantum Hall effect (after 25 years of discovery SPEAKER: Prof. Issai Shlimak, Department of Physics Bar-Ilan University ABSTRACT/COMMENTS: Discovery of the quantum Hall effect (QHE) in 1980 in Si-MOSFET is recognized as one of the most remarkable achievements in the solid state physics in the previous century. Since that time, plenty of works were devoted to investigations of QHE in different two-dimensional (2D) systems. Nevertheless, new features have been observed recently in the classical 2D system - Si-MOSFET. In the first part of the talk, the classical and quantum approach to the motion of 2D electrons in perpendicular electrical and strong magnetic fields is considered. We will discuss also the origin of the localized and delocalized states in a Landau band, as well as physical reasons for appearance of extended plateaus in the Hall resistance in disordered 2D systems. New effects - \"overshoot\" and \"dip\" - will be discussed at the end of the talk. From kletter at bgu.ac.il Wed May 3 22:13:18 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:21 2009 Subject: [Phys-seminars] 2006-05-04 NLD seminar - reminder Message-ID: A Nonlinear Dynamics seminar on: Phase compactons Speaker: Dr. Arkady Pikovsky Department of Physics, Universit?t Potsdam, Germany Tomorrow, May 04 2006 at 11:00, the Physics club (room 002, building 29). For abstract, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From kletter at bgu.ac.il Wed May 3 22:32:36 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-11 NLD seminar Message-ID: A Nonlinear Dynamics seminar on: Dynamics of nonlinear coupled nanomechanical resonators Speaker: Prof. Ron Lifshitz School of Physics & Astronomy , Tel Aviv University Thursday, May 11 2006 at 11:00, the Physics club (room 002, building 29). ABSTRACT attached. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html -------------- next part -------------- A non-text attachment was scrubbed... Name: Lifshitz.pdf Type: application/pdf Size: 7939 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060503/d4788b7b/Lifshitz.pdf From physics at bgu.ac.il Thu May 4 11:29:04 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-10 Astrophysics and Cosmology Seminar Message-ID: <200605040829.LAA40487448@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 10-05-2006 TIME: May 8-14 PLACE: Caesar Premier Hotel, Ein Boqek, Dead Sea TITLE: Dynamical processes in space plasmas SPEAKER: , ABSTRACT/COMMENTS: Students who are registered to the Astrophysics and Cosmology Seminar may get their credit if they attend at least 14 hours of the meeting (approximately two full days). If transportation needed please contact Prof. David Eichler. From jung at bgu.ac.il Thu May 4 12:38:51 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-08 Condensed Matter Seminar Message-ID: <200605040938.MAA40340895@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 08-05-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Effects of doping and magnetic fields up to 32.4T on the tunneling conductance in high Tc superconductor YBCO SPEAKER: Roy Beck-Barkai, School of Physics and Astronomy Tel Aviv University ABSTRACT/COMMENTS: Tunneling into a superconductor is been used for half a centenary as a superb probe for the superconducting electronic state. We measured the tunneling conductance of YBCO high Tc superconductor at the presence of high magnetic fields at various doping levels. Typical planar tunneling conductance into the CuO planes exhibit two main characteristics: zero-bias conductance peak and a gap-like feature. The first is a distinct mark for the d-wave order-parameter symmetry, while the later mark the maximum superconducting gap. In this work we studied the evolution of both the zero-bias peak and gap like feature in the presence of high magnetic fields. Our experimental finding support evidences for a modification in the order-parameter symmetry at high magnetic fields and at different oxygen doping levels. From jung at bgu.ac.il Mon May 8 17:00:26 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-15 Condensed Matter Seminar Message-ID: <200605081400.RAA45318531@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 15-05-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: The conductance of a multi-mode ballistic ring: beyond Landauer and Kubo SPEAKER: Dr. Swarnali Bandopadhyay, Department of Physics Ben Gurion University ABSTRACT/COMMENTS: The Landauer conductance of a two terminal device equals to the number of open modes in the weak scattering limit. What is the corresponding result if we close the system into a ring? Is it still bounded by the number of open modes? Or is it unbounded as in the semi-classical (Drude) analysis? It turns out that the calculation of the mesoscopic conductance is similar to solving a percolation problem. The \"percolation\" is in energy space rather than in real space. The non-universal structures and the sparsity of the perturbation matrix cannot be ignored. [cond-mat/0603484] From nano at bgu.ac.il Wed May 10 23:25:46 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-17 nanotechnology workshop Message-ID: <002201c6746f$ebef2cb0$1b0e4884@estinano> Nanotechnology workshop, Wednesday May 17, 12:00 joined with Physical Chemistry and Lasers seminars building 29, room 306,Chemistry Department seminar room Title : Nonlinear Microscopy with Femtosecond pulses Speaker: Yaron Silberberg Weizmann Institute of Science -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060510/90236c89/attachment.htm From kletter at bgu.ac.il Wed May 10 13:18:05 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-11 NLD seminar - reminder Message-ID: A Nonlinear Dynamics seminar on: Dynamics of nonlinear coupled nanomechanical resonators Speaker: Prof. Ron Lifshitz School of Physics & Astronomy , Tel Aviv University Tomorrow, May 11 2006 at 11:00, the Physics club (room 002, building 29). For abstract, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From kletter at bgu.ac.il Wed May 10 13:19:38 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-18 NO NLD seminar Message-ID: We will not have a seminar next week. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From ramyb at bgu.ac.il Wed May 10 14:46:22 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-11 Physics Colloquium Message-ID: <200605101146.OAA47555617@tzin.bgu.ac.il> Physics Colloquium DATE: 11-05-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Neutron Scattering from Water and Quantum Entanglement SPEAKER: Prof. Raymond Moreh, Department of Physics, BGU ABSTRACT/COMMENTS: CHANGE: Local speaker Prof. Moreh will explain his recent intersting discovery concerning the interactions of neutrons and water. The discovery received world wide exposure because it refutes previous claims that the interactions are anomalous due to quantum effects Prof. Arons, the previously scheduled speaker was hospitalized in California and could not come to Israel. Refreshments are served at 3:20pm Abstract:We performed new measurements to test allegations in a long series of papers claiming that the neutron-proton scattering cross section from H-containing compounds (e.g. H2O) drops by ~ 40% for neutron energies 10 eV – 200 eV. This anomaly was interpreted in terms of quantum entanglement of the two protons in H2O. The results of our experiments revealed no anomalies. From SHUKER at bgu.ac.il Sun May 14 16:04:31 2006 From: SHUKER at bgu.ac.il (SHUKER@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-30 Lasers Seminar Message-ID: <200605141304.QAA2545242@tzin.bgu.ac.il> Lasers Seminar DATE: 30-05-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: UltraCold and UltraFast Physics SPEAKER: Prof Ronnie Kosloff, Department of Physical Chemistry, Hebrew University, Israel ABSTRACT/COMMENTS: From band at bgu.ac.il Tue May 16 10:17:22 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-24 Physical Chemistry Seminar Message-ID: <200605160717.KAA4384841@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 24-05-2006 TIME: 4:00 P.M. (Wed) PLACE: Chemistry club (Building 29, room 306) TITLE: Selective Advantage for Sexual Replication SPEAKER: Dr. Emmanuel Tannenbaum, Ben-Gurion University ABSTRACT/COMMENTS: This talk develops a simplified model for sexual reproduction within the quasi-species formalism. The model assumes a diploid genome consisting of two chromosomes, where the fitness is determined by the number of chromosomes that are identical to a given master sequence. We also assume that there is a cost to sexual reproduction, given by a characteristic time t_{seek} during which haploid cells seek out a mate with which to recombine. If the mating strategy is such that only viable haploids can mate, then when t_{seek} = 0, it is possible to show that sexual reproduction will always out-compete asexual reproduction. However, as t_{seek} increases, sexual reproduction only becomes advantageous at progressively higher mutation rates. Once the time cost for sex reaches a critical threshold, the selective advantage for sexual reproduction disappears entirely. The results of this paper suggest that sexual reproduction is not advantageous in small populations per se, but rather in populations with low replication rates. In this regime, the cost for sex is sufficiently low that the selective advantage obtained through recombination leads to the dominance of the strategy. In fact, at a given replication rate and for a fixed environment volume, sexual reproduction is selected for in high populations because of the reduced time spent finding a reproductive partner. From ramyb at bgu.ac.il Tue May 16 23:41:21 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-18 Physics Colloquium Message-ID: <200605162041.XAA4924221@tzin.bgu.ac.il> Physics Colloquium DATE: 18-05-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Anomalies of the standard cosmological model and a possible remedy by modification of the physics in the dark sector SPEAKER: Prof. A. Nusser, Department of Physics, Technion ABSTRACT/COMMENTS: Refreshments are served at 3:20pm Abstract: The currently viable standard cosmological model is based on the Lambda Cold Dark Matter scenario. The model has been extremely successful at matching many key observations such as the large structure in the Universe and the anisotropy of the cosmic microwave background. But there are few anomalies among which are a. the difficulty in forming galaxies at sufficiently early times and b. the difficult in matching the properties of large galaxies at late times. A possible remedy of these anomalies in terms of adding long range scalar interactions in the dark sector will be discussed. References: Nusser, Gubser & Peebles, 2005, PRD 713505 From physics at bgu.ac.il Wed May 17 10:05:50 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-24 Special Seminar Message-ID: <200605170705.KAA5311819@tzin.bgu.ac.il> Special Seminar DATE: 24-05-2006 TIME: 16:00 PLACE: Physics club (Building 29\' room 2) TITLE: FULLY SELF-CONSISTENT DESCRIPTION COLLECTIVE MODES IN NUCLEI SPEAKER: , Professor S. Shlomo Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA ABSTRACT/COMMENTS: The study of collective modes in nuclei provide very important information on properties of nuclear matter (NM), such as the incompressibility coefficient, K, and the symmetry energy, J. Accurate values of K and J are needed to extend our knowledge of the NM equation of state (EOS) in the vicinity of the the symmetric NM. The EOS is an important ingredient in the study of various properties of nuclei, heavy ion collisions, supernovae and neutron stars. We will review the current status of determining the value of K from data on isoscalar giant monopole resonances (ISGMR) and isocalar giant dipole resonances (ISGDR) within the microscopic theory of mean-field based random phase approximation (RPA). We consider in particular the issues of self-consistency and accuracy of the calculations vis the current accuracy in the experimental data and provide simple explanations to long existing discrepancies in the values deduced for K. From jung at bgu.ac.il Wed May 17 10:11:00 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-22 Condensed Matter Seminar Message-ID: <200605170711.KAA5324470@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 22-05-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Chaos-enchanced Echos in time-reversal experiments with Bose systems. SPEAKER: Prof. Tsampikos Kottos, Department of Physics, Wesleyan University, Middletown, USA, and MPI for Dynamics and Self-Organization, Goettingen, Germany ABSTRACT/COMMENTS: From kletter at bgu.ac.il Wed May 17 12:11:57 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-18 NO NLD seminar - reminder Message-ID: Reminder : we will not have a seminar tomorrow. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From kletter at bgu.ac.il Wed May 17 12:15:05 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-25 NLD seminar Message-ID: A Nonlinear Dynamics seminar on: Dynamical failure of Turing patterns Speaker: Dr. Nadav Shnerb Department of Physics, Bar-Ilan University Thursday, May 25 2006 at 11:00, the Physics club (room 002, building 29). Abstract attached. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html -------------- next part -------------- A non-text attachment was scrubbed... Name: Shnerb.pdf Type: application/pdf Size: 3187 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060517/5eac013e/Shnerb.pdf From nano at bgu.ac.il Thu May 18 01:28:36 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-24 nanotechnology workshop Message-ID: <006c01c67a01$3cf89d80$1b0e4884@estinano> Nanotechnology workshop, Wednesday May 24, 12:00 building 29, room 306,Chemistry Department seminar room Title : Semiconducting polymer self-assembled host/guest nanocomposites for optoelectronic applications Speaker: Gitti Frey Department of Materials Engineering Technion -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060518/346ccc02/attachment.htm From ramyb at bgu.ac.il Thu May 18 14:59:59 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-18 Physics Colloquium Message-ID: <200605181159.OAA6710963@tzin.bgu.ac.il> Physics Colloquium DATE: 18-05-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Anomalies of the standard cosmological model and a possible remedy by modification of the physics in the dark sector SPEAKER: Prof. A. Nusser, Department of Physics, Technion ABSTRACT/COMMENTS: Today! come early if you wish to enjoy the upgraded Refreshments that are served at 3:20pm From physics at bgu.ac.il Sun May 21 10:57:24 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-26 SPECIAL SEMINAR Message-ID: <200605210757.KAA9467667@tzin.bgu.ac.il> SPECIAL SEMINAR DATE: 26-05-2006 TIME: 11:00 PLACE: Physics club (Building 29, room 002) TITLE: Characterization of cold lesion detectability using SPECT on a Kidneys phantom SPEAKER: Ran Ben-Hur, ABSTRACT/COMMENTS: From jung at bgu.ac.il Mon May 22 16:25:54 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-29 Condensed Matter Seminar Message-ID: <200605221325.QAA10905370@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 29-05-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Electron Magnetic Resonance (EMR) technique in ‎study of doped perovskite manganites: recent ‎findings and unsettled questions SPEAKER: Dr. Alexander I. Shames, Physics Department Ben Gurion University ABSTRACT/COMMENTS: Last decade studies of doped perovskite manganites L1-xAxMnO3 (L = ‎rare-earth ion; A = divalent alkaline metal) clearly evidence the presence of ‎rich variety of magnetic and electronic phases, depending on the doping level ‎x and the averaged A-site cation radius . It is widely accepted now that ‎charge carriers in L1-xAxMnO3, at least for moderate x, are mobile holes, ‎which appear due to charge compensation and move from Mn4+ to Mn3+ ions. ‎These holes simultaneously dominate the transport and mediate the ‎ferromagnetic (FM) double exchange (DE) interaction in the FM metallic ‎phase. At the same time, certain electron-orbital configurations energetically ‎favor superexchange (SE) interactions between localized electrons, yielding a ‎formation of FM and/or antiferromagnetic (AFM) insulating phases. ‎ Electron Magnetic resonance (EMR) technique, which comprises ‎Electron Paramagnetic Resonance (EPR) for T > TC and Ferromagnetic ‎Resonance (FMR) for T < TC, is known to be highly sensitive to both minute ‎magnetic phases and short-range interactions and probes time scale of the ‎order of 100 ps.‎ From ramyb at bgu.ac.il Wed May 24 07:53:44 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-25 Physics Colloquium Message-ID: <200605240453.HAA12470475@tzin.bgu.ac.il> Physics Colloquium DATE: 25-05-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Mesoscopic physics: quantum dots and the Aharonov-Bohm interferometer SPEAKER: Prof. Amnon Aharony, Department of Physics, BGU and School of Physics and Astronomy, TAU ABSTRACT/COMMENTS: (Upgraded!) Refreshments are served at 3:20pm From nano at bgu.ac.il Thu May 25 01:02:02 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-31 nanotechnology workshop Message-ID: <005901c67f7d$aff84200$1b0e4884@estinano> Nanotechnology workshop, Wednesday May 31, 12:00 building 29, room 306,Chemistry Department seminar room Title : some DNA condensation Speaker Prof. David Andelman School of Physics and Astronomy Tel Aviv University -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060525/ba1f2988/attachment.htm From band at bgu.ac.il Wed May 24 12:52:02 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-31 Physical Chemistry Seminar Message-ID: <200605240952.MAA12783492@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 31-05-2006 TIME: 4:00 PM (Wed) PLACE: Chemistry club (Building 29, room 306) TITLE: A chip-scale matter-wave Sagnac interferometer – can we beat the limit? SPEAKER: Yonathan Japha, Ben-Gurion University ABSTRACT/COMMENTS: Sagnac interferometers are the best sensors of rotation and acceleration. In principle, the sensitivity of an atomic matter wave interferometer is expected to be 10 orders of magnitude better than that of an optical interferometer with the same geometric parameters and particle number. Can this sensitivity limit be reached? We present a scheme for a chip-scale atomic matter-wave Sagnac interferometer in which atoms circulate many times around a waveguide ring. Practical limitations such as collisions, decoherence, single-mode operation and manufacturability will be discussed. From kletter at bgu.ac.il Wed May 24 13:10:21 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-25 NLD seminar - reminder Message-ID: A Nonlinear Dynamics seminar on: Dynamical failure of Turing patterns Speaker: Dr. Nadav Shnerb Department of Physics, Bar-Ilan University Tomorrow, May 25 2006 at 11:00, the Physics club (room 002, building 29). For abstract, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From band at bgu.ac.il Mon May 29 15:08:01 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-30 Physical Chemistry Seminar Message-ID: <200605291208.PAA18672360@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 30-05-2006 TIME: 3:30 P.M. (Tuesday) PLACE: Physics club (Building 29, room 006) TITLE: UltraCold and UltraFast Physics SPEAKER: Prof Ronnie Kosloff, Hebrew University ABSTRACT/COMMENTS: From avivaf at bgu.ac.il Mon May 29 15:29:38 2006 From: avivaf at bgu.ac.il (avivaf@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-05-30 Lasers Seminar Message-ID: <200605291229.PAA18642582@tzin.bgu.ac.il> Lasers Seminar DATE: 30-05-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: UltraCold and UltraFast Physics SPEAKER: , Prof Ronnie Kosloff, Department of Physical Chemistry, Hebrew University, Israel ABSTRACT/COMMENTS: From jung at bgu.ac.il Tue May 30 16:15:53 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-05 Condensed Matter Seminar Message-ID: <200605301315.QAA19688035@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 05-06-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Propagation of Avalanches in a Molecular Magnet: Magnetic Deflagration SPEAKER: Myriam P. Sarachik, Physics Department City College of CUNY, New York ABSTRACT/COMMENTS: Recent local time-resolved measurements of fast reversal of the magnetization ‎‎(avalanches) in single crystals of Mn12-acetate indicate that the magnetization ‎avalanche spreads as a narrow interface that propagates through the crystal at a ‎constant velocity that is roughly 2 orders of magnitude smaller than the speed of ‎sound. This process is closely analogous to the propagation of a flame front ‎‎(deflagration) through a flammable chemical substance, offering a potentially ‎important new way to investigate the phenomenon of deflagration in molecular ‎magnets, where it is reversible and more easily controlled than in chemical systems.‎ From nano at bgu.ac.il Thu Jun 1 00:58:45 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-07 nanotechnology workshop Message-ID: <006001c684fd$6377dd70$1b0e4884@estinano> Nanotechnology workshop, Wednesday June 7, 12:00 building 29, room 306,Chemistry Department seminar room Title : Self-Assembled Inorganic-Organic Solids: Interfacial Nanostructures and Development of Order in Zero-, One-, Two-, or Three-Dimensions Speaker Professor Brad Chmelka Department of Chemical Engineering UC Santa Barbara -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060531/960634a3/attachment.htm From kletter at bgu.ac.il Wed May 31 16:19:59 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-08 NLD seminar Message-ID: A Nonlinear Dynamics seminar on: Dynamics of septum formation in E. coli Speaker: Prof. M. Feingold Dept. of Physics and Ilse Katz Center for Nanotechnology, Ben-Gurion University Thursday, June 08 2006 at 11:00, the Physics club (room 002, building 29). Abstract attached. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html -------------- next part -------------- A non-text attachment was scrubbed... Name: Mario.pdf Type: application/pdf Size: 5215 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060531/55585b3b/Mario.pdf From shuker at bgu.ac.il Wed May 31 23:10:35 2006 From: shuker at bgu.ac.il (shuker@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-20 Lasers Seminar Message-ID: <200605312010.XAA20888551@tzin.bgu.ac.il> Lasers Seminar DATE: 20-06-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Decoherence mechanisms in EIT medium SPEAKER: Mr M. Shuker, Physics Department, Technion ABSTRACT/COMMENTS: Electromagnetically induced transparency (EIT) is a unique light-matter interaction that exhibits extremely narrow-band spectroscopic features along with low absorption. Recent interest in this phenomenon is driven by its possible applications in quantum information (slow light, storage of light), atomic clocks and precise magnetometers. The EIT phenomenon takes place when an atomic ensemble is driven to a coherent superposition of its ground state sub-levels by two phase-coherent radiation fields. A key parameter of the EIT medium, that limits its applicability, is the coherence lifetime of this superposition (decoherence rate). We have developed a simple technique to measure decay rates within the ground state of an atomic ensemble, and specifically the decoherence rate of the EIT coherent superposition. Detailed measurements were performed in a Rubidium vapor cell at 60-80°C with 30Torr of Neon buffer gas. We have found that the EIT decoherence is dominated by spin-exchange collisions between Rubidium atoms. Other mechanisms of decoherence (or effective decoherence) such as atomic diffusion and pressure broadening will also be discussed (especially their effect on the \"storage of light\" experiment). Finally we discuss the sensitivity of various quantum states of the atomic ensemble to spin-exchange decoherence, and find a set of quantum states that minimize this effect. An experimental demonstration of reduced spin-exchange rate will be presented. From band at bgu.ac.il Sun Jun 4 14:46:50 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-14 Physical Chemistry Seminar Message-ID: <200606041146.OAA25191321@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 14-06-2006 TIME: 4:00 P.M. (Wed) PLACE: Chemistry club (Building 29, room 306) TITLE: Adiabatic theorem for systems without intrinsic time scales SPEAKER: Dr. Alex Elgart, Ben-Gurion University ABSTRACT/COMMENTS: In some situations a physical system may not possess a clear-cut time-scale to measure its \"slowness\". A typical example would be a finite system coupled to external reservoirs, with slowly altered coupling potential. Specifically, we will consider examples of a spin boson system and a quantum dot with attached wires. We discuss the adiabatic theorem for such a setup, and estimate the corresponding non-adiabaticity parameter in the adiabatic theorem in these particular examples. From dcohen at bgu.ac.il Sun Jun 4 17:40:38 2006 From: dcohen at bgu.ac.il (dcohen@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-06 Math seminar Message-ID: <200606041440.RAA25256897@tzin.bgu.ac.il> Math seminar DATE: 06-06-2006 TIME: 12 noon PLACE: building 58, room -101 TITLE: Causal sets and their applications SPEAKER: Eitan Bachmat, Department of computer science, BGU ABSTRACT/COMMENTS: We show that several discrete random processes, which arise in diverse disciplines can be asymptotically analyzed via the notion of a causal set which is a discrete analogue of a spacetime (Lorentzian) geometry. We then consider applicatiions to airplane boarding and some problems in pattern recognition. Some of this work is joint with D.Berend, L.Sapir, S.Skiena and M.Elkin. From ramyb at bgu.ac.il Tue Jun 6 11:24:47 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-08 Physics Colloquium Message-ID: <200606060824.LAA27500145@tzin.bgu.ac.il> Physics Colloquium DATE: 08-06-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: The black hole information paradox SPEAKER: Prof. M. Einhorn, The black hole information paradox Department of Physics and KITP, UC Santa-Barbara, California ABSTRACT/COMMENTS: Interested in finding out what was the bet that Prof. Steven Hawking lost last year? Prof. Einhorn will explain why quantum Black holes are so fundamental to our understanding of quantum mechanics. Prof. M. Einhorn is a Dozor visitor. Refreshments are served at 3:20pm From kletter at bgu.ac.il Wed Jun 7 11:23:10 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-08 NLD seminar - reminder Message-ID: A Nonlinear Dynamics seminar on: Dynamics of septum formation in E. coli Speaker: Prof. M. Feingold Dept. of Physics and Ilse Katz Center for Nanotechnology, Ben-Gurion University Tomorrow, June 08 2006 at 11:00, the Physics club (room 002, building 29). For abstracts, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From kletter at bgu.ac.il Wed Jun 7 11:25:37 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-15 NLD seminar Message-ID: A Nonlinear Dynamics seminar on: Reciprocal oscillons and nonmonotonic fronts in forced nonequilibrium systems Speaker: Dr. Arik Yochelis Department of Physics, University of California at Berkeley Thursday, June 15 2006 at 11:00, the Physics club (room 002, building 29). Abstract attached. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html -------------- next part -------------- A non-text attachment was scrubbed... Name: Yochelis.pdf Type: application/pdf Size: 4115 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060607/ed185b69/Yochelis.pdf From nano at bgu.ac.il Thu Jun 8 01:04:30 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-14 nanotechnology workshop Message-ID: <004301c68a7e$5a3a7250$1b0e4884@estinano> Nanotechnology workshop, Wednesday June 14, 12:00 building 29, room 306,Chemistry Department seminar room Title : Sound Waves and Instabilities in a 1D Microfluidic Crystal of Droplets Speaker Roy Bar-Ziv Dept. of Materials & Interfaces The Weizmann Institute of Science -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060608/e6ecf39c/attachment.htm From jung at bgu.ac.il Wed Jun 7 13:04:48 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-12 Condensed Matter Seminar Message-ID: <200606071004.NAA28765988@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 12-06-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Statistics of Real Eigenvalues in Ginibre\'s Ensemble of Random Real Matrices SPEAKER: Eugene Kanzieper, Department of Applied Mathematics, Holon Academic Institute of Technology, Holon 58102 ABSTRACT/COMMENTS: The integrable structure of Ginibre’s orthogonal ensemble of random matrices is looked at through the prism of the probability p_n;k to find exactly k real eigenvalues in the spectrum of an n X n real asymmetric Gaussian random matrix. The exact solution for the probability function pn;k is presented, and its remarkable connection to the theory of symmetric functions is revealed. An extension of the Dyson integration theorem is a key ingredient of the theory presented. From ramyb at bgu.ac.il Thu Jun 8 08:18:45 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-08 Physics Colloquium Message-ID: <200606080518.IAA29638061@tzin.bgu.ac.il> Physics Colloquium DATE: 08-06-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: The black hole information paradox SPEAKER: Prof. M. Einhorn, Department of Physics and KITP, UC Santa-Barbara, California ABSTRACT/COMMENTS: Prof. Einhorn will explain in simple terms the basic facts about quantum black holes, and why are there so many puzzles and paradoxes about them. (Upgradede) Refreshments are served at 3:20pm From band at bgu.ac.il Mon Jun 12 16:18:09 2006 From: band at bgu.ac.il (band@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-20 Physical Chemistry Seminar Message-ID: <200606121318.QAA34559354@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 20-06-2006 TIME: 3:30 PM (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Decoherence mechanisms in Electromagnetically Induced Transparency media SPEAKER: Mr. M. Shuker, Physics Department, Technion ABSTRACT/COMMENTS: Electromagnetically induced transparency (EIT) is a unique light-matter interaction that exhibits extremely narrow-band spectroscopic features along with low absorption. Recent interest in this phenomenon is driven by its possible applications in quantum information (slow light, storage of light), atomic clocks and precise magnetometers. The EIT phenomenon takes place when an atomic ensemble is driven to a coherent superposition of its ground state sub-levels by two phase-coherent radiation fields. A key parameter of the EIT medium, that limits its applicability, is the coherence lifetime of this superposition (decoherence rate). We have developed a simple technique to measure decay rates within the ground state of an atomic ensemble, and specifically the decoherence rate of the EIT coherent superposition. Detailed measurements were performed in a Rubidium vapor cell at 60-80°C with 30Torr of Neon buffer gas. We have found that the EIT decoherence is dominated by spin-exchange collisions between Rubidium atoms. Other mechanisms of decoherence (or effective decoherence) such as atomic diffusion and pressure broadening will also be discussed (especially their effect on the \"storage of light\" experiment). Finally we discuss the sensitivity of various quantum states of the atomic ensemble to spin-exchange decoherence, and find a set of quantum states that minimize this effect. An experimental demonstration of reduced spin-exchange rate will be presented. From ramyb at bgu.ac.il Tue Jun 13 09:19:18 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-15 Physics Colloquium Message-ID: <200606130619.JAA35333837@tzin.bgu.ac.il> Physics Colloquium DATE: 15-06-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Solitons, breathers, chaos and equipartition SPEAKER: Prof. Norman J. Zabusky , Weizmann Institute of Science , Deptartment of Complex Systems, and Rutgers University, Mecanical and Aerospace Engineering, Piscataway, New Jersey ABSTRACT/COMMENTS: Prof. Zabusky is one of the world pioneers of soliton research. If you do not know what a soliton is and why are they interesting and important in physics and other fields, come an learn. Refreshments are served at 3:20pm From jung at bgu.ac.il Wed Jun 14 10:18:59 2006 From: jung at bgu.ac.il (jung@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-19 Condensed Matter Seminar Message-ID: <200606140718.KAA36500598@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 19-06-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Dynamic Voltage–Current Characteristics of High Temperature Superconductors SPEAKER: David Rozman, Department of Physics, ben Gurion University ABSTRACT/COMMENTS: Dynamic Voltage–Current Characteristics (VCC) are important measurements in the ‎investigation of the vortex matter in type-II High Temperature Superconductors. ‎Usually for mono-crystal superconducting samples, such measurements show clockwise ‎and counterclockwise hysteresis loops in the dynamic VCCs. In a number of ‎publications it was suggested that these loops may result from order-disorder transition ‎in vortex lattice, inhomogeneity of the flux pinning strength, history effect, etc. ‎ The main goal of this research is the investigation of the dynamic VCCs of the ‎mono-filamentary Bi-2223/Ag tapes. At the experimental part of the investigation, the ‎dynamic VCCs of the samples were obtained using DC and pulsed currents. The first ‎stage of theoretical investigations was the development of the theoretical model of the ‎diffusion of the magnetic flux into the sample. In the second stage numerical simulation ‎of the dynamic VCC were carried out. ‎ The experimental and theoretical investigations have shown that the dynamic VCCs ‎deviate substantially from DC VCC. The clockwise and counterclockwise hysteresis ‎loops in dynamic VCCs can be observed for the same sample depending on the location ‎of the potential taps: either at the center or at the edge of the tape. The measured critical ‎current also depends on the location of the potential taps and on the VCC branch chosen ‎for the critical current determination. It was shown that observed features of dynamic ‎characteristics of mono-filamentary superconducting tapes can be explained in the ‎framework of the magnetic diffusion model. ‎ From kletter at bgu.ac.il Wed Jun 14 12:10:50 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-15 NLD seminar - reminder Message-ID: A Nonlinear Dynamics seminar on: Reciprocal oscillons and nonmonotonic fronts in forced nonequilibrium systems Speaker: Dr. Arik Yochelis Department of Physics, University of California at Berkeley Tomorrow, June 15 2006 at 11:00, the Physics club (room 002, building 29). For abstract, updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From nano at bgu.ac.il Thu Jun 15 01:05:25 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-21 nanotechnology workshop Message-ID: <001d01c68ffe$a4310920$1b0e4884@estinano> Nanotechnology workshop, Wednesday June 21, 12:00 building 29, room 306,Chemistry Department seminar room Title : >From protein and peptide tubular structures to nanotechnology Speaker Dr. Nurit Ashkenasy Department of Materials Engineering BGU -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060615/3ecc6665/attachment.htm From kletter at bgu.ac.il Sun Jun 18 13:07:34 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-22 NLD seminar Message-ID: A Nonlinear Dynamics seminar on: Selective advantage for sexual reproduction Speaker: Dr. Emanuel Tannenbaum Department of Chemistry, BGU Thursday, June 22 2006 at 11:00, the Physics club (room 002, building 29). ABSTRACT attached. For updates and future seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html -------------- next part -------------- A non-text attachment was scrubbed... Name: Tannenbaum.pdf Type: application/pdf Size: 10558 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060618/08cec57a/Tannenbaum.pdf From ramyb at bgu.ac.il Tue Jun 20 09:36:03 2006 From: ramyb at bgu.ac.il (ramyb@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-22 Physics Colloquium Message-ID: <200606200636.JAA43211902@tzin.bgu.ac.il> Physics Colloquium DATE: 22-06-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: The role of elastic stress in the statistical and scaling properties of elastic turbulence SPEAKER: Prof. Victor Steinberg, June 22, 2006 Weizmann Institute of Science, Department of Complex Systems ABSTRACT/COMMENTS: The last colloquium of the semester! Refreshments are served at 3:20pm Abstract: The role of elastic stress in the statistical and scaling properties of elastic turbulence in a flow of a polymer solution between two disks is discussed. Analogy with a small scale fast dynamo in magnetohydrodynamics and with a passive scalar turbulent advection in the Batchelor regime is used to explain the experimentally observed statistical properties, flow structure, and scaling of elastic turbulence. The emergence of a new length scale, namely the boundary layer thickness, is observed and studied. From kletter at bgu.ac.il Wed Jun 21 14:13:40 2006 From: kletter at bgu.ac.il (Assaf Kletter) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-22 NLD seminar - reminder Message-ID: A Nonlinear Dynamics seminar on: Selective advantage for sexual reproduction Speaker: Dr. Emanuel Tannenbaum Department of Chemistry, BGU Tomorrow, June 22 2006 at 11:00, the Physics club (room 002, building 29). For abstract, updates and past seminars, please visit our web-site: http://physweb.bgu.ac.il/EVENTS/seminars_NLD.html From nano at bgu.ac.il Mon Jun 26 22:32:48 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-28 nanotechnology workshop Message-ID: <001701c69957$4eb902b0$1b0e4884@estinano> Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: Abstract.doc Type: application/msword Size: 24576 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060626/ce45da8b/Abstract.doc From hbaruch at bgu.ac.il Mon Jun 26 11:31:17 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-26 Condensed Matter Seminar -Special Message-ID: <200606260831.LAA50576443@tzin.bgu.ac.il> Condensed Matter Seminar -Special DATE: 26-06-2006 TIME: 14:00 Monday -- note special time PLACE: Physics club (Building 29, room 002) TITLE: Optical Studies of Metallo-dielectric Photonic Crystals SPEAKER: Prof. Valy Vardeny, Department of Physics, University of Utah, U.S.A. ABSTRACT/COMMENTS: TODAY! From nano at bgu.ac.il Wed Jun 28 22:47:18 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-06-28 nanotechnology workshop-cancelled Message-ID: <000e01c69aeb$a9f11920$1b0e4884@estinano> Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: Abstract.doc Type: application/msword Size: 24576 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060628/071dcd49/Abstract.doc From hbaruch at bgu.ac.il Wed Jul 12 11:11:07 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-07-18 Condensed Matter Seminar - Special Message-ID: <200607120811.LAA69614064@tzin.bgu.ac.il> Condensed Matter Seminar - Special DATE: 18-07-2006 TIME: 10:30am - Tuesday - note special timing PLACE: Physics club (Building 29, room 002) TITLE: Quantum Noise in Nanostructures and Higher Moments SPEAKER: Prof. Daniel Prober, Depts. of Applied Physics and Physics, Yale University, U.S.A. ABSTRACT/COMMENTS: We present some new methods to measure the third moment of the quantum noise of a mesoscopic sample. We show that the correlations between different frequency components reveal information about the sample\'s internal physics which is absent in the second moment, the noise which is usually measured. We show that the second moment noise, under conditions of an external ac drive, reveals similar information about the dwell time and internal dynamics of a nanosystem, such as the diffusion time of a wire, the dwell time of a cavity, or the electron-phonon time. We discuss the potentially large effect of the sample\'s environment on these results. From nano at bgu.ac.il Mon Jul 17 22:30:27 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-07-19 nanotechnology workshop- special seminar Message-ID: <001701c6a9d7$75397380$1b0e4884@estinano> Nanotechnology workshop, Wednesday July 19, 14:00 building 29, room 002,Physics Department seminar room Title : Targeting DNA with PNA Speaker Maxim Frank-Kamenetskii Biomedical Engineering Boston University -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060717/3c6905bf/attachment.htm From nano at bgu.ac.il Wed Jul 19 22:54:49 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-07-19 nanotechnology workshop- special seminar- REMINDER Message-ID: <000e01c6ab6d$33ca2ab0$1b0e4884@estinano> Nanotechnology workshop, Wednesday July 19, 14:00 building 29, room 002,Physics Department seminar room Title : Targeting DNA with PNA Speaker Maxim Frank-Kamenetskii Biomedical Engineering Boston University -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060719/b027e443/attachment.htm From physics at bgu.ac.il Thu Jul 27 09:56:34 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-08-01 Special Seminar Message-ID: <200607270656.JAA85755483@tzin.bgu.ac.il> Special Seminar DATE: 01-08-2006 TIME: 11:00 PLACE: Physics Club, Building 29, Room 002 TITLE: Neutron & X-Ray Production via Pyroelectric Accelerators SPEAKER: , Professor Yaron Danon Rensselaer Polytechnic Institute, Troy, NY, 12180 ABSTRACT/COMMENTS: Pyroelectric accelerators are new exacting simple devices that can accelerate electrons and charge particles. An acceleration potential of over 200 kV was achieved by simple heating and cooling of small pyroelectriccrystals. This potential is used to accelerate electrons and ions in vacuum and into air. Pyroelectric accelerators can also be used to create useful battery operated x-ray and neutron sources. Recent experimental results of electron, x-rays, ion and neutron production will be reviewed. From nano at bgu.ac.il Tue Aug 29 12:53:17 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-08-30 nanotechnology workshop- SPECIAL SEMINAR Message-ID: <003701c6cb50$f3fdda40$1b0e4884@estinano> Nanotechnology workshop, Wednesday August 30, 14:00 building 29, room 002,Physics Department seminar room Title : Response of Bacterial Culture to a Temperature Gradient Speaker Hanna Salman Rockefeller University -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060829/77510c44/attachment.htm From nano at bgu.ac.il Tue Aug 29 12:57:52 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-08-30 nanotechnology workshop- SPECIAL SEMINAR-change of hour Message-ID: <005701c6cb51$978d09b0$1b0e4884@estinano> Nanotechnology workshop, Wednesday August 30, 12:00 building 29, room 002,Physics Department seminar room Title : Response of Bacterial Culture to a Temperature Gradient Speaker Hanna Salman Rockefeller University -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20060829/a85cc95a/attachment.htm From physics at bgu.ac.il Tue Oct 17 09:35:02 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-10-24 Lasers Seminar Message-ID: <200610170735.JAA33170719@tzin.bgu.ac.il> Lasers Seminar DATE: 24-10-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Energy transfer mechanisms in Nd:YVO4 crystals with and without laser action SPEAKER: Mr. Sharone Goldring, Electro-Optics Division, Soreq NRC, Yavne ABSTRACT/COMMENTS: An overview of the various channels of energy transfer from the upper lasing level of Nd:YVO4 following direct pumping at 880 nm will be presented. In order to understand and quantify those mechanisms a set of calorimetric and spectroscopic measurements were preformed with and in absence of laser action. The experimental results along with their consequences will be discussed From nano at bgu.ac.il Thu Oct 19 21:14:48 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-10-25 nanotechnology workshop Message-ID: <005701c6f3b2$d8c930f0$1b0e4884@estinano> Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: Abstract-Mastai BGU 2006.doc Type: application/msword Size: 26624 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061019/b41d31b0/Abstract-MastaiBGU2006.doc From hbaruch at bgu.ac.il Wed Oct 18 17:33:08 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-10-23 Condensed Matter Seminar Message-ID: <200610181533.RAA34142278@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 23-10-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: The conductance of a multi-mode ballistic ring SPEAKER: Yoav Etzioni , Department of Physics, Ben-Gurion University ABSTRACT/COMMENTS: The calculation of the conductance of ballistic rings requires a theory that goes well beyond the Kubo-Drude formula. Assuming \"mesoscopic\" circumstance of very weak environmental relaxation, the conductance is much smaller compared with the naive expectation. Namely, the electro-motive-force induces an energy absorption with a rate that depends crucially on the possibility of making connected sequences of transitions. Thus the calculation of the mesoscopic conductance is similar to solving a percolation problem. The \"percolation\" is in energy space rather than in real space. Non-universal structures and sparsity of the perturbation matrix cannot be ignored. The latter are implied by lack of quantum-chaos ergodicity in ring shaped ballistic devices. From physics at bgu.ac.il Sun Oct 22 13:42:29 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:22 2009 Subject: [Phys-seminars] 2006-10-25 Astrophysics and Cosmology Seminar Message-ID: <200610221142.NAA36985469@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 25-10-2006 TIME: 12:00 noon (Wed) PLACE: Physics club (Building 29, room 002) TITLE: פגישה ראשונה עם פרופ\' דוד אייכלר תתקיים ביום רביעי ה- 25/10/06 בשעה 12:00 בחדר הסמינרים SPEAKER: , ABSTRACT/COMMENTS: From physics at bgu.ac.il Sun Oct 22 13:48:32 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-10-25 Astrophysics and Cosmology Seminar Message-ID: <200610221148.NAA37034117@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 25-10-2006 TIME: 12:00 noon (Wed) PLACE: Physics club (Building 29, room 002) TITLE: antrophysics and cosmology seminar SPEAKER: , ABSTRACT/COMMENTS: first meeting with prophesor Aichler David will take place on wedensday 25\\10\\06 in 12 pm in the seminar room . From hbaruch at bgu.ac.il Tue Oct 24 14:40:47 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-10-30 Condensed Matter Seminar Message-ID: <200610241240.OAA38518252@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 30-10-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Vortex instabilities and flux waves in superconductors SPEAKER: Prof. Yosef Yeshurun, Institute of Superconductivity & Department of Physics, Bar-Ilan University ABSTRACT/COMMENTS: We have discovered a new class of vortex instabilities in Bi2Sr2CaCu2O8+x crystals, namely a spontaneous generation of oscillations in the magnetic induction, in the absence of ac field. This new \'flux waves\' phenomenon may be classified as belonging to the general category of spatio-temporal pattern formation in non-equilibrium systems, encountered in hydrodynamics, nonlinear optics, chemistry and biology. Flux waves present a rare example of instability that is periodic in both space and time. In this talk I will show magneto-optical imaging demonstrating flux waves and propose an explanation based on the assumption that flux waves have their origin in diffusion processes in the vortex matter. From nano at bgu.ac.il Thu Oct 26 21:20:39 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-10-25 nanotechnology workshop-REMINDER Message-ID: <002f01c6f933$d299f030$1b0e4884@estinano> Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: Abstract-Mastai BGU 2006.doc Type: application/msword Size: 26624 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061026/5725c241/Abstract-MastaiBGU2006.doc From physics at bgu.ac.il Wed Oct 25 09:45:56 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-01 Astrophysics and Cosmology Seminar Message-ID: <200610250745.JAA39253966@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 01-11-2006 TIME: 12:00 noon (Wed) PLACE: Physics club (Building 29, room 002) TITLE: first meeting with prophesor Aichler David will take place on wedensday 1\\11\\\\06 in 12 pm in the seminar room SPEAKER: , ABSTRACT/COMMENTS: From physics at bgu.ac.il Wed Oct 25 09:49:08 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-10-25 Astrophysics and Cosmology- Cancelled! Message-ID: <200610250749.JAA39269063@tzin.bgu.ac.il> Astrophysics and Cosmology- Cancelled! DATE: 25-10-2006 TIME: 12:00 noon (Wed) PLACE: Physics club (Building 29, room 002) TITLE: first meeting with prophesor Aichler David will take place on wedensday 25/10/06 in 12 pm in the seminar room SPEAKER: , ABSTRACT/COMMENTS: From nano at bgu.ac.il Fri Oct 27 00:03:47 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-01 nanotechnology workshop Message-ID: <00a301c6f94a$9c8b9f90$1b0e4884@estinano> Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: Veksler abs 1.11.06.doc Type: application/msword Size: 25088 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061027/3e57a4b1/Vekslerabs1.11.06.doc From nano at bgu.ac.il Wed Oct 25 12:13:02 2006 From: nano at bgu.ac.il (nano@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-01 Nanotechnology Workshop Message-ID: <200610251013.MAA39240726@tzin.bgu.ac.il> Nanotechnology Workshop DATE: 01-11-2006 TIME: 12:00 (noon) PLACE: Chemistry club (Building 29, room 306) TITLE: Phase Separation and Membrane Protrusions Driven by Actin Polymerization and Adhesion SPEAKER: Alexander Veksler, Chemical Physics department Weizmann Institute of Science ABSTRACT/COMMENTS: Phase Separation and Membrane Protrusions Driven by Actin Polymerization and Adhesion Alex Veksler and Nir S. Gov Department of Chemical Physics, The Weizmann Institute of Science, P.O.B. 26, Rehovot, Israel 76100 Formation of protrusions and protein segregation on the membrane is of a great importance for the functioning of the living cell. This is most evident in recent experiments that show the effects of the mechanical properties of the surrounding substrate on cell morphology. We model the cell membrane as having a mobile but constant population of protein with a convex spontaneous curvature. Our basic assumption is that these membrane proteins represent small clusters that may include both adhesion proteins (integrins) and proteins that activate actin polymerization (WASP). We propose a continuum model based on the Helfrich\'s Hamiltonian for the membrane elastic energy, including the adhesion, with the actin force added to the equations of motion. Linear stability analysis shows that sufficiently strong adhesion energy and actin polymerization force, can bring about phase separation of the membrane protein and the appearance of protrusions. Specifically this occurs when the spo ntaneous curvature alone does not. Different instability characteristics are calculated for the various regimes, and are compared to various types of observed protrusions. From physics at bgu.ac.il Wed Oct 25 12:19:41 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-10-26 Physics Colloquium Message-ID: <200610251019.MAA39194250@tzin.bgu.ac.il> Physics Colloquium DATE: 26-10-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Percolation and propagation in living neural networks: Exploring the limits of neural cultures . SPEAKER: Prof. Elisha Moses, Physics of Complex Systems, Weizmann Institute of Science ABSTRACT/COMMENTS: The simplest model system in neurobiology is that of cultured neurons, extracted from the brain and grown in a supporting fluid on a glass plate. In the brain these neurons carry out complex computations, but in culture they are limited to a burst-like behavior. While neurobiologists may worry about such cultures? relevance for the brain, for the physicist this system offers an ideal chance to investigate the features that differentiate the network in the brain from that in vitro, and how it loses its extraordinary computational capability. We present recent results in which simple experimental systems in vitro reveal the underlying connectivity of the network, previously inaccessible. The experimental systems include linear, 1D patterned neural networks and a percolating 2D one. Their experimental and conceptual simplicity enables precise comparison to several physical theoretical models. Excellent agreement is obtained for propagation velocities of the activity, the decay o f information with distance, burst initiation zones and the behavior of the giant component in percolation. We show that the random, unguided manner in which connections are created in vitro is what ultimately limits the network. We discuss devices in which guidance and structuring can recuperate some of the computational capabilities. Refreshments are served at 3:20pm From mario at bgu.ac.il Wed Oct 25 15:57:34 2006 From: mario at bgu.ac.il (mario@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-10-26 Physics Colloquium Message-ID: <200610251357.PAA39410442@tzin.bgu.ac.il> Physics Colloquium DATE: 26-10-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Percolation and propagation in living neural networks: Exploring the limits of neural cultures SPEAKER: Prof. Elisha Moses, Physics of Complex Systems, Weizmann Institute of Science ABSTRACT/COMMENTS: The simplest model system in neurobiology is that of cultured neurons, extracted from the brain and grown in a supporting fluid on a glass plate. In the brain these neurons carry out complex computations, but in culture they are limited to a burst-like behavior. While neurobiologists may worry about such cultures’ relevance for the brain, for the physicist this system offers an ideal chance to investigate the features that differentiate the network in the brain from that in vitro, and how it loses its extraordinary computational capability. We present recent results in which simple experimental systems in vitro reveal the underlying connectivity of the network, previously inaccessible. The experimental systems include linear, 1D patterned neural networks and a percolating 2D one. Their experimental and conceptual simplicity enables precise comparison to several physical theoretical models. Excellent agreement is obtained for propagation velocities of the activity, the decay of information with distance, burst initiation zones and the behavior of the giant component in percolation. We show that the random, unguided manner in which connections are created in vitro is what ultimately limits the network. We discuss devices in which guidance and structuring can recuperate some of the computational capabilities. From physics at bgu.ac.il Thu Oct 26 09:17:43 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-10-31 Lasers Seminar Message-ID: <200610260717.JAA40050160@tzin.bgu.ac.il> Lasers Seminar DATE: 31-10-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Blinking membrane protein clusters SPEAKER: Levi A. Gheber, Department of Biotechnology Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel ABSTRACT/COMMENTS: Cell membranes have been originally considered to serve merely as a shell, a bag containing the organelles of the cell. However, research showed that in fact cell membranes of many cell types appear to be patchy, strewn with heterogeneities whose composition and function differ from the average for an entire membrane. In particular, the Major Histocompatibility Complex class I (MHC-I), a protein complex involved in immune system signaling, has been shown to form sub-micrometer clusters on the plasma membrane. The model suggested for the mechanism leading to this clustering, involving barriers to free diffusion, was shown to be insufficient, unless it takes into account a dynamic behavior. Using a green fluorescent protein (GFP) tagged MHC-I construct, in combination with live imaging under laser-excited total internal reflection fluorescence microscopy (TIRFM), we revealed for the first time the dynamics of these clusters. From mario at bgu.ac.il Sun Oct 29 15:46:36 2006 From: mario at bgu.ac.il (mario@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-02 Physics Colloquium Message-ID: <200610291346.PAA42744438@tzin.bgu.ac.il> Physics Colloquium DATE: 02-11-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Light at the beginning of the tunnel: the implications of photophysics in biological membranes to photodynamic therapy SPEAKER: Prof. Benjamin Ehrenberg , Department of Physics, Bar Ilan University ABSTRACT/COMMENTS: Several types of sensitizer molecules are being tested and used for photodynamic therapy of malignancies and other diseases. These molecules are taken up by cellular membranes and upon illumination the absorbed photon\'s energy is transmitted to excite molecular oxygen to its electronically excited state, singlet oxygen. Singlet oxygen is extremely active and it causes cellular damage and death. The effect of physical attributes of the membrane, such as its composition, temperature, phase, fluidity, electric potential etc., on the uptake of sensitizers was studied. The vertical depth of insertion of the sensitizer in the membrane, even when the depth changes by merely a few Angstroms, turns out to be a critical parameter because of the rapid diffusion of singlet oxygen in the membrane, as well as out of it. Refreshments are served at 3:20pm From Ibar at bgu.ac.il Wed Nov 1 09:35:28 2006 From: Ibar at bgu.ac.il (Ilana Bar) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-07 Lasers Seminar Message-ID: <008c01c6fd88$4f9dd080$d10f4884@ilap> ANNOUNCEMENT==> Lasers Seminar DATE: 07-11-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Nonlinear photonic crystals SPEAKER: Professor Ady Arie, Department of Physical Electronics School of Electrical Engineering Tel-Aviv University Tel-Aviv Israel 69978 ABSTRACT/COMMENTS: Nonlinear photonic crystals are artificial materials in which the nonlinear susceptibility is periodically modulated in either one or two dimensions. I will discuss how these materials are produced and analyzed, and review some applications - nonlinear frequency conversion, all-optical processing and generation of entangled photons. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061101/4d6a30d6/attachment.htm From nano at bgu.ac.il Fri Nov 3 00:07:10 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-08 nanotechnology workshop Message-ID: <007c01c6fecb$3e46c780$1b0e4884@estinano> Nanotechnology workshop, Wednesday November 8, 12:00 building 29, room 306,Chemistry Department seminar room Title : Controlled Oxidative Processes in the Field of Functional Conducting Polymers. Diversity of Applications of Corresponding Polymers in Nano(bio)technology Speaker Jean-Paul Lellouche Dept. of Chemistry Bar Ilan University -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061103/65813ead/attachment.htm From hbaruch at bgu.ac.il Thu Nov 2 14:43:00 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-06 Condensed Matter Seminar Message-ID: <200611021243.OAA900632@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 06-11-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Bell\'s Inequality Vioalton with Non - Negative Wigner Funcions SPEAKER: Prof. Micha Revzen, Department of Physics, Technion ABSTRACT/COMMENTS: The local hidden variables underpinning of the EPR (Einstein Podolsky and Rosen) state, the Mother of all entangled states, is attained via its representation in terms of its Wigner representative function. We discuss the possibility of violating Bell\'s Inequality for this state. The problem was raised by Bell in his whimsy article on EPR - EPW (Eugene Paul Wigner) dilemma. From physics at bgu.ac.il Thu Nov 2 15:02:23 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-06 Condensed Matter Seminar Message-ID: <200611021302.PAA893000@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 06-11-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Bell\\\'s Inequality Vioalton with Non - Negative Wigner Funcions SPEAKER: Prof. Micha Revzen, Department of Physics, Technion, ABSTRACT/COMMENTS: The local hidden variables underpinning of the EPR (Einstein Podolsky and Rosen) state, the Mother of all entangled states, is attained via its representation in terms of its Wigner representative function. We discuss the possibility of violating Bell\\\'s Inequality for this state. The problem was raised by Bell in his whimsy article on EPR - EPW (Eugene Paul Wigner) dilemma. From physics at bgu.ac.il Sun Nov 5 08:18:09 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-08 Physical Chemistry Seminar Message-ID: <200611050618.IAA2998328@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 08-11-2006 TIME: 4:00pm (Wed) PLACE: Chemistry club (Building 29, room 306) TITLE: \"Controlling atoms in the nanometer scale: trapping and detecting single atoms near a microdisk resonator\" SPEAKER: Dr. Yonathan Japha, Ben-Gurion University of the Negev ABSTRACT/COMMENTS: From hbaruch at bgu.ac.il Sun Nov 5 10:19:06 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-07 Condensed Matter Seminar Message-ID: <200611050819.KAA3017571@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 07-11-2006 TIME: 11:00am Tuesday -- note special time! PLACE: Physics club (Building 29, room 002) TITLE: Structural similarity enhances interaction propensity of proteins SPEAKER: Dr. Dima Lukatsky, Department of Chemistry and Chemical Biology, Harvard University ABSTRACT/COMMENTS: Several independent analyses of accumulating high-throughput and specific data on protein-protein interactions revealed a general statistical bias for homodimeric complexes. It was also shown experimentally that the sequence similarity is a major factor in enhancing the propensity of proteins to aggregate. The physical or evolutionary reasons for these striking observations remain unexplained. We study statistical properties of interacting protein-like surfaces and predict two strong, related effects: (i) Statistically enhanced self-attraction of proteins; (ii) Statistically enhanced attraction of proteins with similar structures. The effects originate in the fact that the probability to find a pattern self-match between two identical, even randomly organized interacting protein surfaces is always higher compared with the probability for a pattern match between two different, promiscuous protein surfaces. This theoretical finding explains statistical prevalence of homodimers in protein-protein interaction networks reported earlier. Further, our findings are confirmed by the analysis of curated database of protein complexes that showed highly statistically significant overrepresentation of dimers formed by structurally similar proteins with highly divergent sequences (“superfamily heterodimers”). We predict that significant fraction of heterodimers evolved from hom odimers with the negative design evolutionary pressure applied against promiscuous homodimer formation. This is achieved through the formation of highly specific contacts formed by charged residues as demonstrated both in model and real superfamily heterodimers. From mario at bgu.ac.il Mon Nov 6 14:33:08 2006 From: mario at bgu.ac.il (mario@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-09 Physics Colloquium Message-ID: <200611061233.OAA3933153@tzin.bgu.ac.il> Physics Colloquium DATE: 09-11-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Electrons in one dimension SPEAKER: Dr. Rafi de Picciotto , One-dimensional conductors, or quantum wires, are both very simple and highly intricate electronic systems. When viewed as merely a confinement scheme for otherwise free Fermions they present a particularly straightforward picture because the dynamics is very restricted; an electron moving down the wire can either maintain course or reverse its propagation direction. In clean wires this backscattering can be suppressed to facilitate ballistic electronic transport down long wires - a simple electronic behavior indeed. Yet charged Fermions are never completely free but rather interact via Columbic forces. One-dimensional wires are unique in that even weak interactions have far reaching consequences; completely dismissing the aforementioned simple picture. These so called Luttinger liquids do not support single particles excitations at all. Instead, new Bosonic collective degrees of freedom emerge as charge and spin density waves. This talk will describe transport measurements of one-dimensional wires, conducted in the highly controlled geometry afforded by MBE growth onto the cleaved edge of a high-quality GaAs/AlGaAs heterostructure. These ultra clean wires allow controlled experimentation and a peek into the rich physics of one dimensional conductors. ABSTRACT/COMMENTS: Refreshments are served at 3:20pm From mario at bgu.ac.il Mon Nov 6 15:40:15 2006 From: mario at bgu.ac.il (Mario) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-09 Physics Colloquium Message-ID: <03a001c701a9$191f4910$430d4884@mariooffice> Physics Colloquium DATE: 09-11-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Electrons in one dimension SPEAKER: Dr. Rafi de Picciotto Bell-Labs, Lucent Technologies, Murray Hill, NJ Abstract One-dimensional conductors, or quantum wires, are both very simple and highly intricate electronic systems. When viewed as merely a confinement scheme for otherwise free Fermions they present a particularly straightforward picture because the dynamics is very restricted; an electron moving down the wire can either maintain course or reverse its propagation direction. In clean wires this backscattering can be suppressed to facilitate ballistic electronic transport down long wires - a simple electronic behavior indeed. Yet charged Fermions are never completely free but rather interact via Columbic forces. One-dimensional wires are unique in that even weak interactions have far reaching consequences; completely dismissing the aforementioned simple picture. These so called Luttinger liquids do not support single particles excitations at all. Instead, new Bosonic collective degrees of freedom emerge as charge and spin density waves. This talk will describe transport measurements of one-dimensional wires, conducted in the highly controlled geometry afforded by MBE growth onto the cleaved edge of a high-quality GaAs/AlGaAs heterostructure. These ultra clean wires allow controlled experimentation and a peek into the rich physics of one dimensional conductors. COMMENTS: Refreshments are served at 3:20pm *********************************** Mario Feingold Dept. of Physics, Ben Gurion Univ., Beer Sheva 84105,Israel tl. 972 8 6472459 (office) 972 8 6477542/2155 /61587(lab) 972 8 6466169 (h) 054-4571232 (mobile) Fax. 972 8 6472903/4 e-mail: mario@bgumail.bgu.ac.il http://www.bgu.ac.il/~mario/ *********************************** -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061106/6449ff6b/attachment.htm From physics at bgu.ac.il Tue Nov 7 08:57:09 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-16 Physics Colloquium Message-ID: <200611070657.IAA4537000@tzin.bgu.ac.il> Physics Colloquium DATE: 16-11-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Tsunami, how it happens. The physics. SPEAKER: Giora Shaviv , Dept. of Physics, Technion ABSTRACT/COMMENTS: We derive in a simple way the fundamental equations of Tsunami waves and use them to explain the fantastic properties of Tsunami waves, (speed, power, frequency etc) Next we discuss the excitation mechanisms. How such wave are excited. We then discuss what happened during the big Tsunami on dec 26th 2004. We end with analyzing the question: Could a Tsunami occur in Israel? (One happened in the history) Refreshments are served at 3:20pm From physics at bgu.ac.il Tue Nov 7 12:27:05 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-08 Astrophysics Seminar Message-ID: <200611071027.MAA4651849@tzin.bgu.ac.il> Astrophysics Seminar DATE: 08-11-2006 TIME: 12:00 noon (Wed) PLACE: Physics club (Building 29, room 002) TITLE: Force-Free Magnetosphere SPEAKER: Andrey timokhin, ABSTRACT/COMMENTS: From Ibar at bgu.ac.il Wed Nov 8 12:04:55 2006 From: Ibar at bgu.ac.il (Ilana Bar) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-14 Lasers Seminar Message-ID: <001601c7031d$58a769d0$d10f4884@ilap> ANNOUNCEMENT==> Lasers Seminar DATE: 14-11-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Opto-excited mechanical vibrations of an optical cavity by centrifugal radiation-pressure nonlinearity SPEAKER: Dr. Tal Carmon, Department of Applied Physics, California Institute of Technology, Pasadena, California, USA ABSTRACT/COMMENTS: The long-lasting trend of miniaturizing optical cavities and reducing their optical losses results in enhancement of the optical buildup intensity and generally facilitates experiments in non-linear optics. It was only recently that the resonance in an on-chip silica cavity with nano-scale accuracy was enhanced to such an extent that optical excitation of the mechanical vibrational mode was observed. Just like the force we feel when our car hits a sharp curve; conservation of linear momentum implies that the light circulating in a ring cavity pushes its walls centrifugally. As no cavity is infinitely stiff, the circulating light inflates the ring to change its optical pathlength. Opto-mechanical vibration will be reviewed in different geometries of the cavity structure, as well as in various frequency bands spanning from MHz to radio-frequencies rates (>GHz). Prof. I. Bar Department of Physics Ben Gurion University of the Negev Beer Sheva 84105 ISRAEL Tel: 972-8-6461571 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061108/4e325aa8/attachment.htm From nano at bgu.ac.il Fri Nov 10 00:04:33 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-15 nanotechnology workshop Message-ID: <008901c7044b$0aeb9ca0$1b0e4884@estinano> Nanotechnology workshop, Wednesday November 15, 12:00 building 29, room 306,Chemistry Department seminar room Title : Supramolecular assembly of cytoskeleton proteins Speaker Uri Raviv The Department of Physical Chemistry The Hebrew University of Jerusalem ABSTRACT: At present there is a surge in interest in biophysical research in elucidating collective interactions between cellular proteins and associated biomolecules leading to supramolecular structures, with the ultimate goal of relating structure to function. The nerve cell cytoskeleton, provides a rich example of highly ordered bundles and networks of interacting neurofilaments, microtubules (MT) and filamentous actin, where the nature of the interactions, structures and structure-function correlations remain poorly understood. We present synchrotron x-ray diffraction, electron microscopy, and optical imaging data, in reconstituted protein systems from the bovine central nervous system, which reveal unexpected structures not predicted by current electrostatic theories of polyelectrolyte bundling, including 3D MT bundles and 2D MT necklaces and bionanotubes with open or closed ends. In collaboration with M. C. Choi, D. Needleman, M. Ojeda-Lopez, J. Jones, H. Miller, and L. Wilson, S. Feinstein and C.R. Safinya -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061110/1c4ba1fc/attachment.htm From hbaruch at bgu.ac.il Wed Nov 8 12:40:59 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-13 Condensed Matter Seminar Message-ID: <200611081040.MAA5412912@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 13-11-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Nanodots and nanocrystals detectors applications and questions SPEAKER: Dr. Yossi Paltiel, Solid state physics group, Soreq NRC Yavne ABSTRACT/COMMENTS: Nano technology is in the center of attention in the last decade. In our work we are using nanodots, nanocrystals and quantum wells to study and fabricate infrared devices. In this study we aim to develop an accurate, single photon, narrow band infrared sensor that will use quantum mechanics at room temperature. The sensor is based on a FET like structure, in which the current is very sensitive to potential changes on its surface. We have shown that this configuration provides flexibility and variability in operation bandgap and response. However, the relations between the quantum and the macroscopic world are not trivial and the coupling between worlds influences the transport, noise, and optical measurements. In this talk we will show the general concepts of using low dimensional quantum devices and present open questions that need to be addressed in order to achieve real room temperature mesoscopic physics. From hbaruch at bgu.ac.il Wed Nov 8 12:58:07 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-14 Condensed Matter & Lasers seminar Message-ID: <200611081058.MAA5446619@tzin.bgu.ac.il> Condensed Matter & Lasers seminar DATE: 14-11-2006 TIME: 3:30pm (Tuesday) -- note timing of joint seminar PLACE: Physics club (Building 29, room 002) TITLE: Opto-excited mechanical vibrations of an optical cavity by centrifugal radiation-pressure nonlinearity SPEAKER: Dr. Tal Carmon, Department of Applied Physics, California Institute of Technology, Pasadena, California ABSTRACT/COMMENTS: The long-lasting trend of miniaturizing optical cavities and reducing their optical losses results in enhancement of the optical buildup intensity and generally facilitates experiments in non-linear optics. It was only recently that the resonance in an on-chip silica cavity with nano-scale accuracy was enhanced to such an extent that optical excitation of the mechanical vibrational mode was observed. Just like the force we feel when our car hits a sharp curve; conservation of linear momentum implies that the light circulating in a ring cavity pushes its walls centrifugally. As no cavity is infinitely stiff, the circulating light inflates the ring to change its optical pathlength. Opto-mechanical vibration will be reviewed in different geometries of the cavity structure, as well as in various frequency bands spanning from MHz to radio-frequencies rates (>GHz). From physics at bgu.ac.il Tue Nov 14 14:20:41 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-15 Astrophysics and Cosmology Seminar Message-ID: <200611141220.OAA9950993@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 15-11-2006 TIME: 12:00 noon (Wed) PLACE: Physics club (Building 29, room 002) TITLE: Force-Free Magnetosphere - Part 2 SPEAKER: Andrey timokhin, ABSTRACT/COMMENTS: From physics at bgu.ac.il Tue Nov 14 14:38:58 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-14 Lasers seminar - reminder!!!!! Message-ID: <200611141238.OAA9920288@tzin.bgu.ac.il> Lasers seminar - reminder!!!!! DATE: 14-11-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Opto-excited mechanical vibrations of an optical cavity by centrifugal radiation-pressure nonlinearity SPEAKER: Dr. Tal Carmon, Department of Applied Physics, California Institute of Technology, Pasadena, California, ABSTRACT/COMMENTS: The long-lasting trend of miniaturizing optical cavities and reducing their optical losses results in enhancement of the optical buildup intensity and generally facilitates experiments in non-linear optics. It was only recently that the resonance in an on-chip silica cavity with nano-scale accuracy was enhanced to such an extent that optical excitation of the mechanical vibrational mode was observed. Just like the force we feel when our car hits a sharp curve; conservation of linear momentum implies that the light circulating in a ring cavity pushes its walls centrifugally. As no cavity is infinitely stiff, the circulating light inflates the ring to change its optical pathlength. Opto-mechanical vibration will be reviewed in different geometries of the cavity structure, as well as in various frequency bands spanning from MHz to radio-frequencies rates (>GHz). From mario at bgu.ac.il Tue Nov 14 20:58:36 2006 From: mario at bgu.ac.il (mario@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-16 Physics Colloquium Message-ID: <200611141858.UAA10166935@tzin.bgu.ac.il> Physics Colloquium DATE: 16-11-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Tsunami, how it happens. The physics. SPEAKER: Prof. Giora Shaviv - Dept. of Physics, Technion, We derive in a simple way the fundamental equations of Tsunami waves and use them to explain the fantastic properties of Tsunami waves, (speed, power, frequency etc) Next we discuss the excitation mechanisms. How such waves are excited. We then discuss what happened during the big Tsunami on dec 26th 2004. We end with analyzing the question: Could a Tsunami occur in Israel? (One happened in the history) ABSTRACT/COMMENTS: Refreshments are served at 3:20pm From nano at bgu.ac.il Fri Nov 17 00:06:08 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-22 nanotechnology workshop Message-ID: <008c01c709cb$6b623dc0$1b0e4884@estinano> Nanotechnology workshop, Wednesday November 22, 12:00 building 29, room 306,Chemistry Department seminar room Title : Equilibrium Amorphous Films at Metal-Ceramic Interfaces in Metal-Ceramic Nanocomposites Speaker Prof.Wayne Kaplan Department of Materials Engineering Technion Abstract: Equilibrium Amorphous Films at Metal-Ceramic Interfaces in Metal-Ceramic Nanocomposites Wayne D. Kaplan Department of Materials Engineering Technion ? Israel Institute of Technology Intergranular amorphous films (IGF) with a thickness of ~1nm exist at grain boundaries and surfaces in many ceramic systems. The formation and existence of IGFs have been explained by different theories, in terms of multi-layer adsorption, prewetting films and diffuse interface models [1-3]. In addition, the stability and equilibrium thickness of thin amorphous films was considered by Clarke et al. [5-6]. They showed that for a stable film thickness to exist there should be a force balance between attractive forces (e.g. van der Waals forces) and repulsive forces (e.g. steric interactions originating from partial ordering of the nominally amorphous film), leading to the term equilibrium amorphous films. In this work the nature of IGFs at metal-ceramic interfaces was investigated via detailed microstructural characterization of model metal-alumina nanocomposites, and wetting/dewetting experiments [7-11]. Cu-alumina and Ni-alumina composites, with and without anorthite glass-forming additives, were produced and characterized. The composites doped with glass-forming additives contained amorphous pockets at the triple junctions, as well as IGFs at all of the metal-alumina interfaces. No amorphous phase was observed in the undoped composite materials. For comparison with the nanocomposite system, model interfaces were prepared by dewetting thin metal films on sapphire substrates which were first partially wetted by anorthite glass. These experiments confirmed the existence of equilibrated films, and the existence of surficial films on sapphire. Calculation of Hamaker constants for the metal-ceramic interfaces resulted in a stronger attractive force for IGFs at metal-alumina interfaces, compared to alumina grain boundaries, correlating to the film thickness measured in this work. In the doped composites the metal particles were found at triple junctions, grain boundaries, and as occluded particles within the alumina grains. The occluded particles were found to have a limited size range of 250?20 nm, while particles at grain boundaries had a size of 1.4?0.3 ?m. It is suggested that the higher driving force for grain growth during the initial stages of sintering, together with an increased value of mobility due to the presence of IGFs at the matrix grain boundaries, results in increased particle-boundary detachment during the initial stages of sintering. This is seen as the dominant mechanism in determining the location of the particles in the microstructure, which in turn can be used to control the properties of the composite. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061117/73343fd0/attachment.htm From physics at bgu.ac.il Wed Nov 15 13:29:25 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-22 Organic/Biophysics Chemistry Seminar Message-ID: <200611151129.NAA10647755@tzin.bgu.ac.il> Organic/Biophysics Chemistry Seminar DATE: 22-11-2006 TIME: 17:00 (Wed) PLACE: Chemistry club (Building 29, room 306) TITLE: \"Monomer Dynamics in DNA and Actin Polymers\" SPEAKER: Mr. Roman Shusterman, Department of Physics, Ben-Gurion University of the Negev ABSTRACT/COMMENTS: We present the measurements of the kinetics of the stochastic motion of individual monomers within three types of biological polymers: double- and single-stranded DNA (dsDNA and ssDNA) and actin filaments. The combination of specific fluorescence labeling and Fluorescence Correlation spectroscopy technique allows us to measure the monomers\' mean-square displacement (MSD) in a wide range of time and length scales. The internal dynamics of ssDNA and dsDNA coils is characterized by very different kinetic laws: ~t2/3 for ssDNA in agreement with Zimm theory, and ~t1/2 for dsDNA in a surprising agreement with the Rouse model, which neglects the hydrodynamic interactions between the monomers. We apply the same technique to actin filaments, where we explore the segmental dynamics in the range below polymer Kuhn length. From Ibar at bgu.ac.il Thu Nov 16 15:50:56 2006 From: Ibar at bgu.ac.il (Ilana Bar) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] (no subject) Message-ID: <017901c70986$3d67a9e0$d10f4884@ilap> Lasers Seminar DATE: 21-11-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Structure and morphology of pulsed laser deposited boron carbide films: Influence of deposition geometry SPEAKER: Daniel Zemsky , Department of Physics, Ben Gurion University of the Negev, Beer Sheva 84105, Israel ABSTRACT/COMMENTS: Development of thin films of superhard materials, based on covalently bonded solids containing light elements as boron, carbon and nitrogen are not only of great scientific interest but also could be very useful. In this study, pulsed laser deposition (PLD) of a sintered boron carbide (B4C) target was used to deposit thin films on room temperature silicon, Si(100), substrates. Deposition was accomplished by positioning the substrates parallel (on-axis geometry) to a rotating target or perpendicular (off-axis configuration) and tilted relative to the target. The morphology and structure of the B4C films was characterized by different methods. The on-axis deposited films consist of B4C crystalline particles, while those deposited in off-axis and tilted configurations exhibit tilted nanocolumns with respect to the surface normal. The tilt angles were controlled by changing the substrate to target angle and consequently the vapor incident angle. PLD's ability to produce crystalline dense films or columnar films with a desired tilt angle might provide a unique advantage in designing three-dimensional structures. Prof. I. Bar Department of Physics Ben Gurion University of the Negev Beer Sheva 84105 ISRAEL Tel: 972-8-6461571 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061116/9493683f/attachment.htm From Ibar at bgu.ac.il Thu Nov 16 17:51:43 2006 From: Ibar at bgu.ac.il (Ilana Bar) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-21 Lasers Seminar Message-ID: <01c501c70997$1d3d8070$d10f4884@ilap> Lasers Seminar DATE: 21-11-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Structure and morphology of pulsed laser deposited boron carbide films: Influence of deposition geometry SPEAKER: Daniel Zemsky , Department of Physics, Ben Gurion University of the Negev, Beer Sheva 84105, Israel ABSTRACT/COMMENTS: Development of thin films of superhard materials, based on covalently bonded solids containing light elements as boron, carbon and nitrogen are not only of great scientific interest but also could be very useful. In this study, pulsed laser deposition (PLD) of a sintered boron carbide (B4C) target was used to deposit thin films on room temperature silicon, Si(100), substrates. Deposition was accomplished by positioning the substrates parallel (on-axis geometry) to a rotating target or perpendicular (off-axis configuration) and tilted relative to the target. The morphology and structure of the B4C films was characterized by different methods. The on-axis deposited films consist of B4C crystalline particles, while those deposited in off-axis and tilted configurations exhibit tilted nanocolumns with respect to the surface normal. The tilt angles were controlled by changing the substrate to target angle and consequently the vapor incident angle. PLD's ability to produce crystalline dense films or columnar films with a desired tilt angle might provide a unique advantage in designing three-dimensional structures. Prof. I. Bar Department of Physics Ben Gurion University of the Negev Beer Sheva 84105 ISRAEL Tel: 972-8-6461671 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061116/b9cb09b8/attachment.htm From physics at bgu.ac.il Sun Nov 19 08:50:16 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-22 Physical Chemistry Seminar Message-ID: <200611190650.IAA13455823@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 22-11-2006 TIME: 4:00pm (Wed) PLACE: Chemistry club (Building 29, room 306) TITLE: \"Photon correlations induced by disorder in a mesoscopic gas of cold atoms\" SPEAKER: Prof. Eric Akkermans, Department of Physics, Technion-Israel Institute of Technology ABSTRACT/COMMENTS: From hbaruch at bgu.ac.il Sun Nov 19 18:43:27 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-20 Condensed Matter Seminar Message-ID: <200611191643.SAA13813461@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 20-11-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: no seminar today SPEAKER: , ABSTRACT/COMMENTS: From physics at bgu.ac.il Mon Nov 20 11:48:49 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-21 Lasers Seminar -Notes room Change !!!! Message-ID: <200611200948.LAA14286349@tzin.bgu.ac.il> Lasers Seminar -Notes room Change !!!! DATE: 21-11-2006 TIME: 3:30pm (Tue) PLACE: Chemistry club (Building 29, room 306) TITLE: Structure and morphology of pulsed laser deposited boron carbide films: Influence of deposition geometry SPEAKER: Daniel Zemsky , Department of Physics, Ben Gurion University of the Negev, Beer Sheva 84105, Israel ABSTRACT/COMMENTS: Development of thin films of superhard materials, based on covalently bonded solids containing light elements as boron, carbon and nitrogen are not only of great scientific interest but also could be very useful. In this study, pulsed laser deposition (PLD) of a sintered boron carbide (B4C) target was used to deposit thin films on room temperature silicon, Si(100), substrates. Deposition was accomplished by positioning the substrates parallel (on-axis geometry) to a rotating target or perpendicular (off-axis configuration) and tilted relative to the target. The morphology and structure of the B4C films was characterized by different methods. The on-axis deposited films consist of B4C crystalline particles, while those deposited in off-axis and tilted configurations exhibit tilted nanocolumns with respect to the surface normal. The tilt angles were controlled by changing the substrate to target angle and consequently the vapor incident angle. PLD\'s ability to produce crystall ine dense films or columnar films with a desired tilt angle might provide a unique advantage in designing three-dimensional structures. From avivaf at bgu.ac.il Tue Nov 21 15:04:58 2006 From: avivaf at bgu.ac.il (avivaf@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-22 Astrophysics and Cosmology Seminar Message-ID: <200611211304.PAA15230125@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 22-11-2006 TIME: 12:00 noon (Wed) PLACE: Physics club (Building 29, room 002) TITLE: Force-Free Magnetosphere - Part 3 SPEAKER: Andrey Timokhin,, ABSTRACT/COMMENTS: From Ibar at bgu.ac.il Wed Nov 22 08:25:28 2006 From: Ibar at bgu.ac.il (Ilana Bar) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-28 Lasers Seminar Message-ID: <036901c70dff$011cba70$d10f4884@ilap> ANNOUNCEMENT==> Lasers Seminar DATE: 28-11-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Grid methods for cold molecules : determination of photoassociation lineshapes and rate constants SPEAKER: Dr. Shimshon Kallush, Laboratoire Aim?e Cotton, CNRS, B?at. 505, Campus dOrsay, 91405 Orsay Cedex, France The Fritz Haber Research Center, The Hebrew University of Jerusalem, Jerusalem 91904, Israel ABSTRACT/COMMENTS: A description of photoassociation by CW laser is formulated in the framework of grid methods. The Hamiltonian describing one or several bound states coupled to a continuum via a radiative field is written in energy representation and diagonalized. The generality of the treatment allows to compute accurately and efficiently physical properties such as non-linear high-intensity energy shifts, line shapes, and PA rates both for isolated and non-isolated resonances. Application is given to sodium photoassociation in the experimental conditions of Mc Kenzie et al [Phys. Rev. Lett.88, 090403 (2002)]. Comparison with the model of Bohn and Julienne [Phys. Rev. A 60, 414 (1999)] is discussed. Prof. I. Bar Department of Physics Ben Gurion University of the Negev Beer Sheva 84105 ISRAEL Tel: 972-8-6461571 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061122/7914f72d/attachment.htm From nano at bgu.ac.il Fri Nov 24 00:21:37 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-29 nanotechnology workshop Message-ID: <009b01c70f4d$bf6404d0$1b0e4884@estinano> Nanotechnology workshop, Wednesday November 29, 12:00 building 29, room 306,Chemistry Department seminar room Title : Multi-photon Entangled States Speaker: Hagai Eisenberg The Racah Institute of Physics The Hebrew University of Jerusalem Abstract: Quantum entanglement is the most intriguing property of quantum mechanics. It helps us to reveal the differences between the non-local quantum realism and the classical world. Currently, the primary source for photon quantum entanglement is the nonlinear optical effect of parametric down-conversion. In the stimulated regime, entangled states that contain many (>2) photons can be generated. We will show how such multi-photon states are created and characterized. The effect of photon bunching will be generalized to many photons and related to multi-photon entangled states. We will also demonstrate another generalization of bunching, for composite photon states. In some circumstances, this generalization results in a fermionic-like behavior of anti-bunching. [1] H.S. Eisenberg, G. Khoury, G. Durkin, C. Simon and D. Bouwmeester, Phys. Rev. Lett. 93, 193901 (2004) [2] H.S. Eisenberg, J.F. Hodelin, G. Khoury, and D. Bouwmeester, Phys. Rev. Lett. 94, 090502 (2005) [3] H.S. Eisenberg, J.F. Hodelin, G. Khoury, and D. Bouwmeester, Phys. Rev. Lett. 96, 160404 (2006) -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061124/6f13e3f0/attachment.htm From hbaruch at bgu.ac.il Wed Nov 22 14:15:39 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-27 Condensed Matter Seminar Message-ID: <200611221215.OAA15850710@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 27-11-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: LiHo_xY_{1-x}F_4 as a random field Ising model SPEAKER: Dr. Moshe Schechter , Department of Physics and Astronomy, University of British Columbia Vancouver, Canada ABSTRACT/COMMENTS: LiHo_xY_{1-x}F_4 is a model quantum Ising magnet. By tuning the applied transverse magnetic field and the dilution, the magnitude of quantum fluctuations and randomness can be controlled. This enables the experimental study of the classical and quantum phase transitions between the ferromagnetic and spin-glass phases to the paramagnetic phase, as well as other quantum phenomena such as single spin tunneling, quantum annealing, and quantum tunneling of domain walls. Here we show that the interplay between the intrinsic offdiagonal terms of the dipolar interaction and the applied transverse field results in an effective local random longitudinal field. In the spin glass regime this leads to the destruction of the spin-glass phase at infinitesimal transverse field. The paramagnetic phase is then reached through a crossover, and not a quantum phase transition, explaining the long standing experimental puzzle of the smearing of the cusp in the nonlinear susceptibility as temperatu re is reduced. In the ferromagnetic regime we show that this system could be the first experimental realization of the random field Ising model in a ferromagnetic system, with the potential of studying theoretical ideas ranging from the critical dimensionality to nonequilibrium phase transitions and self organized criticality. From mario at bgu.ac.il Thu Nov 23 11:59:20 2006 From: mario at bgu.ac.il (mario@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-23 Physics Colloquium Message-ID: <200611230959.LAA16513930@tzin.bgu.ac.il> Physics Colloquium DATE: 23-11-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: A magnetic analog of the isotope effect in high temperature superconductors SPEAKER: Prof. Amit Keren, Dept. of Physics, Technion ABSTRACT/COMMENTS: Since the discovery of high temperature superconductivity in the cuprates, it has been speculated that their pairing mechanism is due to magnetic interactions. However, this was never proven. Such a proof would require an experiment similar to the isotope effect in metallic superconductors, namely, a measurement of Tc versus the strength of the magnetic coupling J, with no other structural changes. We have done such an experiment and found that indeed pairing in the cuprates stems from magnetic interactions. Refreshments are served at 3:20pm From physics at bgu.ac.il Thu Nov 23 12:36:52 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-12-03 Seminar Message-ID: <200611231036.MAA15882894@tzin.bgu.ac.il> Seminar DATE: 03-12-2006 TIME: Sunday, 10:00 am PLACE: Physics Club, Building 29, Room 002 TITLE: Quantum Gunn Effect as a Source of Noise in n- and p-type Quantum Wells SPEAKER: Avi Ben Simon, Physics Department, BGU ABSTRACT/COMMENTS: Transport noise in quantum wells systems has been studied extensively in the last years. Generation-recombination noise has been accepted as a dominant noise mechanism. Therefore, in the existing literature each quantum well is treated as a discrete extrinsic standard generation recombination noise source. Within such approach the resulting current noise should be Gaussian with frequency independent spectrum, up to a cutoff frequency located in the GHz range. We have observed non Gaussian noise components in both n-type and p-type quantum wells . From mario at bgu.ac.il Thu Nov 23 19:05:01 2006 From: mario at bgu.ac.il (mario@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-30 Physics Colloquium Message-ID: <200611231705.TAA16852779@tzin.bgu.ac.il> Physics Colloquium DATE: 30-11-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Phase transitions in Einstein\'s theory of gravity SPEAKER: Dr. Barak Kol, Racah Institute of Physics, The Hebrew University. ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collp06_files/Barak%20Kol.html Refreshments are served at 3:20pm From physics at bgu.ac.il Sun Nov 26 11:15:53 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-29 Physical Chemistry Seminar Message-ID: <200611260915.LAA18752180@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 29-11-2006 TIME: 15:30 (Wed) - שימו לב לשינוי בשעה!!! PLACE: Chemistry club (Building 29, room 306) TITLE: \"New insights into the hydrodynamic response of complex fluids\" SPEAKER: Dr. Haim Diamant, Department of Chemical Physics School of Chemistry, Tel-Aviv University ABSTRACT/COMMENTS: From physics at bgu.ac.il Tue Nov 28 09:12:38 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-12-04 Particles and Fields Seminar Message-ID: <200611280712.JAA20159133@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 04-12-2006 TIME: 10:00pm (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Solitonic and non-solitonic Q-Stars SPEAKER: Yosef Verbin, Open University ABSTRACT/COMMENTS: From hbaruch at bgu.ac.il Tue Nov 28 15:14:44 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-12-04 Condensed Matter Seminar Message-ID: <200611281314.PAA20320408@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 04-12-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Mesomechanics of non-equilibrium disordered systems SPEAKER: Dr. Chay Goldenberg, Laboratoire de Physique et Mecanique des Milieux Heterogenes Ecole Superieure de Physique et de Chimie Industrielles Paris, France ABSTRACT/COMMENTS: Modeling the mechanics of non-equilibrium (or athermal) amorphous materials such as glasses, dense colloids, foams and granular matter is of both basic scientific interest and great practical importance. Continuum models such as elasticity and plasticity are commonly used, with limited success. In order to improve upon these models, a fundamental understanding of their microscopic origin is required; however, the standard tools of solid state physics and equilibrium statistical mechanics are inapplicable. I will show that a spatial averaging (coarse-graining) method can provide a systematic relation between the microscopic dynamics and the continuum description. One application is a new way to define fluctuations and to characterize material inhomogeneities, which are common features of these systems. This approach may serve as a microscopic basis for existing phenomenological mesoscale models describing plastic deformation and flow. Another characteristic feature is the lack of scale separation between the microscopic (particle) scale and the macroscale. I will present a systematic study of this issue, and discuss possible implications to nanoscale systems. From Ibar at bgu.ac.il Tue Nov 28 17:38:55 2006 From: Ibar at bgu.ac.il (Ilana Bar) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-12-05 Lasers Seminar Message-ID: <001501c71303$508c4c70$d10f4884@ilap> ANNOUNCEMENT==> Lasers Seminar DATE: 05-12-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: The potential of rare earth doped silver halide crystals for mid-IR solid state lasers and fiber lasers SPEAKER: Mr. Ofer Gayer, Sackler Faculty of Exact Sciences, School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978 ABSTRACT/COMMENTS: There is an interest in developing mid-IR solid state lasers and fiber lasers, for applications such as remote sensing and IR spectroscopy. Specifically, mid-IR lasers at 3 - 5 ?m would be useful for development of countermeasures against heat seeking missiles. Although a significant effort has been made worldwide to develop such lasers, the results obtained so far have been limited, because of a lack of host materials with the desired properties such as optical transparency and low phonon energy. Silver halide crystals of the form AgClxBr1-x (0 Nanotechnology workshop, Wednesday December 06, 12:00 building 29, room 306,Chemistry Department seminar room Title : Do electrons superconduct in the electron doped cuprate superconductors? Speaker: Dr. Yoram Dagan School of Physics and Astronomy, Tel Aviv University Abstract: A striking property of the high Tc cuprate superconductors is the extreme sensitivity of many of their electronic properties to the number of charge carriers put into the copperoxygen planes (doping). From a chemical point of view these charge carriers can be either holes, as in La2-xSrxCuO4, or electrons as in Pr2-xCexCuO4. However, in the electron-doped superconducting cuprates, transport and angle resolved photoemission spectroscopy studies have shown that both electrons and holes play a role in the normal state properties. An interesting and important question is whether both also play a role in the superconducting state. Here we show that in Pr2-xCexCuO4 the resistivity ?xx at high temperatures 100K < T < 300 K is mostly sensitive to the electrons. Its temperature behaviour is doping independent over a wide doping range and even for non superconducting samples. On the other hand, the transverse resistivity ?xy, or the Hall angle ?H where cot(?H)=?xx/?xy, is sensitive to both holes and electrons. Its temperature dependence is strongly influenced by doping, and cot(?H) can be used to identify optimum doping (the maximum Tc) even well above the critical temperature. These new results lead to a remarkable conclusion, namely, that in electron doped cuprates holes are responsible for the superconductivity. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061201/28f4bec3/attachment.htm From mario at bgu.ac.il Wed Nov 29 23:09:20 2006 From: mario at bgu.ac.il (mario@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-11-30 Physics Colloquium - Reminder Message-ID: <200611292109.XAA21454629@tzin.bgu.ac.il> Physics Colloquium - Reminder DATE: 30-11-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Phase transitions in Einstein\'s theory of gravity SPEAKER: Dr. Barak Kol, Racah Institute of Physics, The Hebrew University ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collp06_files/Barak%20Kol.html Refreshments are served at 3:20pm From physics at bgu.ac.il Thu Nov 30 12:45:13 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-12-04 Joint Particles and Astrophysics Semin Message-ID: <200611301045.MAA21971006@tzin.bgu.ac.il> Joint Particles and Astrophysics Semin DATE: 04-12-2006 TIME: 10:00pm (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Solitonic and non-solitonic Q-Stars SPEAKER: Yosef Verbin, Open University ABSTRACT/COMMENTS: From physics at bgu.ac.il Thu Nov 30 13:03:05 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-12-05 Lasers Seminar Message-ID: <200611301103.NAA21964943@tzin.bgu.ac.il> Lasers Seminar DATE: 05-12-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: The potential of rare earth doped silver halide crystals for mid-IR solid state lasers and fiber lasers SPEAKER: Mr. Ofer Gayer, Sackler Faculty of Exact Sciences, School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978 ABSTRACT/COMMENTS: There is an interest in developing mid-IR solid state lasers and fiber lasers, for applications such as remote sensing and IR spectroscopy. Specifically, mid-IR lasers at 3 - 5 µm would be useful for development of countermeasures against heat seeking missiles. Although a significant effort has been made worldwide to develop such lasers, the results obtained so far have been limited, because of a lack of host materials with the desired properties such as optical transparency and low phonon energy. Silver halide crystals of the form AgClxBr1-x (0 Physics Colloquium DATE: 07-12-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Strong electronic correlations far from thermal equilibrium SPEAKER: Prof. Avraham Schiller, Racah Institute of Physics, The Hebrew University ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collp06_files/Schiller.html Refreshments are served at 3:20pm From physics at bgu.ac.il Sun Dec 3 12:34:33 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-12-06 Astrophysics and Cosmology Seminar Message-ID: <200612031034.MAA24081512@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 06-12-2006 TIME: 12:00 noon (Wed) PLACE: Physics club (Building 29, room 002) TITLE: Transmitted and reflected electrons and the collisionless shock front SPEAKER: A. Rozenberg, ABSTRACT/COMMENTS: From Ibar at bgu.ac.il Tue Dec 5 16:47:25 2006 From: Ibar at bgu.ac.il (Ilana Bar) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-12-12 Lasers Seminar Message-ID: <003601c7187c$472077f0$d10f4884@ilap> ANNOUNCEMENT==> Lasers Seminar DATE: 12-12-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Selective Molecular Alignment by Ultrashort Pulses SPEAKER: Prof. Yehiam Prior, Department of Chemical Physics, Weizmann Institute of Science, Rehovot ABSTRACT/COMMENTS: Rotating molecules kicked by ultrashort laser pulses tend to align along the direction of the laser electric field. Following their prompt alignment, the motion continue to rotate, giving rise the periodic revivals of the alignment. We use combinations of femtosecond pulses to selectively address a single component in a mixture, to separate isotopic species, and to identify nuclear isomers. The potential implications of these observations will be discussed. Prof. I. Bar Department of Physics Ben Gurion University of the Negev Beer Sheva 84105 ISRAEL Tel: 972-8-6461571 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061205/7b0f2d78/attachment.htm From nano at bgu.ac.il Fri Dec 8 00:10:38 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-12-13 nanotechnology workshop Message-ID: <005501c71a4c$86dc7520$1b0e4884@estinano> Nanotechnology workshop, Wednesday December 13, 12:00 building 29, room 306,Chemistry Department seminar room Title : Thermal stability of metallic nano-clusters and film patterning on solid surfaces: Weakly bound buffer layer assisted processes Speaker: Prof. Micha Asscher Department of Physical Chemistry The Hebrew University Jerusalem Abstract: Growth of metallic nano-clusters and control over their size are critically important for catalysis. Development of film patterning at the nanometer scale has significant impact on future lithography. In this work we combine a method to deposit metallic nano-clusters using weakly bound buffer layer as an intermediate substance to control the clusters size with laser patterning that modulates their surface density. Using optical probes, the size selected diffusion of gold nano-clusters on metallic and oxygen modified surfaces has been studied. Information on clusters mobility is critical for understanding and control the thermal stability of clusters toward the development of sintering resistant catalysts. The same technique was further developed at thicker film thickness to pattern the layer at the sub-micron to nanometer scale employing a single laser pulse. This technique is discussed as a novel approach for lithography. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061208/6be70004/attachment.htm From hbaruch at bgu.ac.il Thu Dec 7 09:57:01 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:23 2009 Subject: [Phys-seminars] 2006-12-11 Condensed Matter Seminar Message-ID: <200612070757.JAA27039633@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 11-12-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Studying atomic scale interactions and friction from surface dynamics measurements SPEAKER: Dr. Gil Alexandrowicz, Cavendish laboratory, University of Cambridge, UK. ABSTRACT/COMMENTS: The atomic scale interactions and the frictional forces which take place on a surface play a critical role in a wide range of fields. Examples include industrial catalysis, molecular beam epitaxial growth, atmospheric reactions and numerous applications in the fast growing field of nano-technology. The isolated and collective motion of an atom or a molecule on the surface is a particularly sensitive probe of the various interactions taking place. However this typically ultra fast and complex motion is extremely difficult to measure on an atomic scale. The helium Cambridge spin echo spectrometer[1], is a unique apparatus which is capable of measuring the atomic scale diffusion and the vibrational properties of surfaces within a time scale previously inaccessible to the experiment. In my talk, I will present measurements of isolated and collective surface diffusion[2][3], surface phonons of clean metals and thin film systems, and gas-surface interactions[1] which have been performed with this apparatus. From these studies I will illustrate how the underlying atomic scale interactions and the nano-scale friction can be extracted from the observed surface dynamics. [1] Jardine et al. Science 304, 1790(2004). [2] Alexandrowicz et al. Phys. Rev. Lett. 93, 156103(2004). [3] Alexandrowicz et al. Phys. Rev. Lett. 96, 156103(2006). From physics at bgu.ac.il Sun Dec 10 12:16:32 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-13 Organic/Biophysics Chemistry Seminar Message-ID: <200612101016.MAA29247048@tzin.bgu.ac.il> Organic/Biophysics Chemistry Seminar DATE: 13-12-2006 TIME: 18:00 PLACE: Bldg. 29 Room 306 (Chemistry club) TITLE: \"Peptide assemblies as platforms for biomineralization and hydrogels\" SPEAKER: Dr. Hanna Rapaport, Department of Biotechnology Engineering, Ben Gurion University of the Negev ABSTRACT/COMMENTS: The rational design and fabrication of biological materials with diverse structures, functionalities and utilities is steadily advancing. In our studies we utilize protein secondary structural motifs, mainly b-sheets, to form ordered molecular assemblies amenable to nanometer scale applications and to bottom-to-top design of biomaterials. Amphiphilic b-sheet peptides have been designed to form ordered monolayer structures, applicable to nanometer scale patterning at interfaces. Single stranded peptides, seven to seventeen amino acids long and triple-stranded folded peptides were shown to form anti-parallel b-sheets in registered arrangements. Two-component peptide systems were designed to exhibit complementary electrostatic interactions that induce parallel b-sheet forms. The b-sheet monolayer structures were found to bend elastically and reversibly under applied surface pressures. Recently these b-sheet films were utilized as templates for the nucleation of calcite and the b one mineral hydroxyapatite. Three-dimensional hydrogel matrices could be generated with the same peptides assembled into fibrous structures. From physics at bgu.ac.il Sun Dec 10 12:58:51 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-13 Physical Chemistry Seminar Message-ID: <200612101058.MAA29447693@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 13-12-2006 TIME: 4:00pm (Wed) PLACE: Chemistry club (Building 29, room 306) TITLE: \"Slowing down of Supersonic beams- a new tool in low energy collisions\" SPEAKER: prof. Uzi Even, Sackler School of Chemistry, Tel Aviv University ABSTRACT/COMMENTS: From gideonc at bgu.ac.il Sun Dec 10 16:43:51 2006 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-14 Physics Colloquium Message-ID: <200612101443.QAA29459976@tzin.bgu.ac.il> Physics Colloquium DATE: 14-12-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: The prospect of light emitting sources using hexagonal quantum dots SPEAKER: Prof. Dan Rich, Dept. of Physics, Ben-Gurion University ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collp06_files/Rich.html Refreshments are served at 3:20pm From hbaruch at bgu.ac.il Tue Dec 12 17:24:19 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-18 Condensed Matter Seminar Message-ID: <200612121524.RAA31051068@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 18-12-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Correlations in quantum dots: How far can analytics go? SPEAKER: Dr. Vyacheslavs (Slava) Kashcheyevs, Department of Physics, Ben-Gurion University ABSTRACT/COMMENTS: Anderson impurity model has been a paradigm for understanding of electron interactions in fully confined geometries for more than forty years. Modern techniques for fabrication and control of semiconductor quantum dots require proper theoretical methods for treatment of this and the corresponding generalized models in a wide parameter range. We review available options for analytical understanding of these models, and discuss our recent investigation for one of the powerful methods -- self-consistent solutionof the truncated equations of motions (EOM). Applied to the most subtle low-temperature regime of a simple quantum dot, the EOM method captures all the hallmarks of the Kondo effect, but underperformsin quantitative predictions. Alternative approaches for more tricky and less explored models are discussed as well. From hbaruch at bgu.ac.il Tue Dec 12 17:39:22 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-19 Condensed Matter Seminar-Special Message-ID: <200612121539.RAA31127562@tzin.bgu.ac.il> Condensed Matter Seminar-Special DATE: 19-12-2006 TIME: 11:00am Tuesday -- note special timing PLACE: Physics club (Building 29, room 002) TITLE: Cold and dense dipolar exciton quantum fluids in two dimensions SPEAKER: Dr. Ronen Rapaport, Device Physics Department, Bell Laboratories, Lucent Technologies, New Jersey, U.S.A. ABSTRACT/COMMENTS: Excitons, coulomb bound electron-hole bound states, are quasi-particle excitations that are analogous to boson-like atoms in many ways. New methods now allow to create and to confine such particles in ultra-clean coupled two-dimensional layers, with extremely long lifetimes. With the right design, those excitons can become dipolar, with all the electric-dipoles aligned. Such a configuration forms a unique system of interacting bosons in two-dimensions, a system quite rare and which, in many ways, remains unexplored. At the extreme density and temperature limits, collective quantum effects are expected and the system should undergo quantum phase transitions to new collective phases in two dimensions. Moreover, under such conditions, the (hydro-) dynamics of the exciton fluid is uniquely determined by the intricate interplay of interaction and quantum statistics, opening up opportunities for new design and study of quantum fluid devices. In this talk I will review the progress and remaining challenges in this growing field, and describe our efforts to develop techniques for manipulating, trapping and cooling dense exciton fluids and to observe collective quantum effects. I will also do my best to portray a picture of what we now know and what we do not yet know of such systems and of what may lay next in exciton fluidics research. On a different note, I will also briefly describe, if time will permit, our ongoing efforts in combining and exploring the nonlinear optics of optically active nanoparticles-polymer composites interacting with sub-micron metallic plasmon devices. From hbaruch at bgu.ac.il Tue Dec 12 17:52:51 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-20 Condensed Matter Seminar-special Message-ID: <200612121552.RAA30416308@tzin.bgu.ac.il> Condensed Matter Seminar-special DATE: 20-12-2006 TIME: 10:00am -- Wednesday PLACE: Physics club (Building 29, room 002) TITLE: Magnetic and electric fluctuations in atom chip systems SPEAKER: Maxim Sokolovsky, Department of Physics, Ben-Gurion University ABSTRACT/COMMENTS: In partial fulfillment for an MSc degree From Ibar at bgu.ac.il Tue Dec 12 18:03:18 2006 From: Ibar at bgu.ac.il (Ilana Bar) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-19 Lasers Seminar Message-ID: <006a01c71e07$0a4b4d60$d10f4884@ilap> ANNOUNCEMENT==> Lasers Seminar DATE: 19-12-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: >From precision measurement to precision control with an ultrafast frequency comb SPEAKER: Dr. Avi Pe'er , JILA, University of Colorado, Boulder, USA ABSTRACT/COMMENTS: Although mode-locked lasers emit broadband ultrashort pulses, they can be utilized to perform frequency selective excitation just like narrow-band CW lasers due to their precise frequency comb. This spectral selectivity is explained by the very long inter-pulse coherence, which allows for coherent accumulation of the excitation amplitudes from multiple pulses. This idea led to the realization of direct frequency comb spectroscopy in atomic systems. I will review the basics of comb technology and the principles of direct frequency comb spectroscopy. I will then describe how these concepts can be expanded into the realm of precision coherent control, where coherent accumulation can be combined with analytic coherent control schemes, to precisely control molecular dynamics at high efficiencies. As a design example I will explain how a coherent train of weak shaped pulses can be used to perform narrow-band Raman transitions between molecular vibrational levels at efficiencies that approach unity and unprecedented spectral resolution. Prof. I. Bar Department of Physics Ben Gurion University of the Negev Beer Sheva 84105 ISRAEL Tel: 972-8-6461571 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061212/d5f3f0b2/attachment.htm From gideonc at bgu.ac.il Mon Dec 18 17:05:29 2006 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-21 Physics Colloquium Message-ID: <200612181505.RAA34962641@tzin.bgu.ac.il> Physics Colloquium DATE: 21-12-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Excitation of Pulsar Wind Nebulae SPEAKER: Prof. Jonathan Arons, University of California at Berkeley ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collp06_files/Arons.html Refreshments are served at 3:20pm From physics at bgu.ac.il Tue Dec 19 08:17:54 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-20 Physical Chemistry Seminar Message-ID: <200612190617.IAA36057493@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 20-12-2006 TIME: 4:00pm (Wed) PLACE: Chemistry club (Building 29, room 306) TITLE: \"New Quantum Properties of Vortices\" SPEAKER: Prof. Assa Auerbach, Department of Physics, the Technion ABSTRACT/COMMENTS: The quantum tunneling rate of a vortex hopping between pinning sites is calculated for a vortex wavefunction Within Bogolibov theory. A transport theory of the vortex insulator is derived The results are relevant to rotating BEC\'s and to predicted films. Variable range hopping magnetoresistance in disordered superconducting In a recent exciting development, Linder, Arovas and I are able to show that vortices of hard-core lattice bosons at half filling are spin half fermions A vortex metal state is predicted as the vortex density increases, with novel thermodynamic and transport properties. From Ibar at bgu.ac.il Tue Dec 19 17:27:33 2006 From: Ibar at bgu.ac.il (Ilana Bar) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-26 Lasers Seminar Message-ID: <04bc01c72382$34569a80$d10f4884@ilap> ANNOUNCEMENT==> Lasers Seminar DATE: 26-12-2006 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Intracavity Laser Spectroscopy for Flame Diagnostics SPEAKER: Prof. Sergey Cheskis, School of Chemistry, Tel Aviv University, Ramat Aviv, Tel Aviv 69978 ABSTRACT/COMMENTS: Intracavity Laser Absorption Spectroscopy (ICLAS) is one of the most sensitive methods of the absorption spectroscopy. ICLAS can be successfully applied to in-situ measurements in hostile flame environment without sensitivity decrease. The fundamentals of ICLAS and its applications in different scientific areas will be discussed. Previously, most of ICLAS applications were based on dye or Ti:sapphire lasers that limited the spectral range of the method. Recently, ICLAS based on fiber lasers operating in the near IR spectral range (FLICAS, Fiber Laser Intracavity Spectroscopy) was developed and applied to the first in-situ measurements of the HCN and NH3 in low pressure methane flame. The results of our recent experiments demonstrating the limits of the sensitivity of FLICAS will be considered. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061219/fc6d3a6b/attachment.htm From nano at bgu.ac.il Fri Dec 22 00:54:06 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-27 nanotechnology workshop Message-ID: <001801c72552$ebb397b0$1b0e4884@estinano> Nanotechnology workshop, Wednesday December 27, 12:00 building 29, room 306,Chemistry Department seminar room Title : The Chemistry of Surface Confined Organic Molecules within a Thin Film Interface Speaker: Prof. Haim Sukenik Department of Chemistry Bar Ilan University Abstract: Self-assembled monolayer films (SAMs) are a powerful tool for creating uniform, conformal coatings with well-defined chemical composition and physical properties. They also provide ideal models for the study and quantitation of a variety of interfacial interactions. To take full advantage of the unique features of the SAMs, we must be able to follow chemical processes that occur at the monolayer-solution interface and understand how this unique reaction environment can influence the selectivity and rate of organic reactions. Examples will be brought from electrophilic aromatic substitution chemistry, from acid-base chemistry, and from organometallic reactions. We will also examine the effectiveness of such functionalized organic interfaces as control elements in the interfacial adhesion of solution generated oxide films. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061222/c9f6e000/attachment.htm From nano at bgu.ac.il Fri Dec 22 01:10:35 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2007-01-02 nanotechnology SPECIAL SEMINAR Message-ID: <007f01c72555$3895fcb0$1b0e4884@estinano> Nanotechnology SPECIAL SEMINAR , Tuesday January 2, 15:00 Auditorium in the Hi-Tec Building, No.37, Room 202 Title : Nanoslab approach to design and synthesis of hierarchical silica materials Speaker: Professor Johan A. Martens Center for Surface Chemistry and Catalysis K.U. Leuven, Belgium Abstract: Zeolite materials are technical key elements of a sustainable industrialized world. Zeolite adsorbents and catalysts are workhorses of chemical industry and environmental protection. A handicap of today's zeolite technology is the zeolite particle size of typically around the micrometer. Downsizing of the zeolite particle size to the nanometer scale would lift mass transfer limitations of adsorption and catalysis. A common approach to shorten the micropore length is through the generation of mesopores in the zeolite crystals such as via steaming. Compared to such uncontrolled generation of mesopores, much advantage is to be expected from hierarchical materials having structural order at the mesoscale in addition to the nanoscale. The realization of combined structuring at the micro- and mesoscale is not evident. The reason for the slow progress in hierarchical material development is the limited understanding of the molecular mechanisms through which zeolite frameworks are actually assembled. We exploited the knowledge of the best understood zeolite synthesis, viz. that of silicalite-1 and demonstrate how this knowledge can be exploited in the development of hierarchical materials. Under carefully selected synthesis conditions, silica polymerizes with the help of tetrapropylammonium ions (primary template) into pre-fabricated functional building units. We succeeded to synthesize such entities ? the so-called precursor and the nanoslab. Nanoslabs can either be assembled into bulk zeolite phase, but more attractive is their assembly into hierarchical structures with multiple porosity termed Zeogrids and Zeotiles using secondary templates. In new hierarchical structures, nanoslabs are linked through their corners, edges or faces following patterns imposed by interaction with surfactant or triblock copolymer. A remarkably high mesostructural order is typical for these assemblies. After evacuation of the organics, microporosity inside the nanoslabs, and an exceptionally open mesopore network between the nanoslabs depending on the tiling pattern of the nanoslabs is obtained. The structure of Zeogrids and Zeotiles is highly sensitive to the mixing conditions, suggesting a strong impact of convection on the nanoslab ordering process upon surfactant addition. The influence of microgravity conditions on the kinetic parameters of particle growth has been studied by sounding rocket experiments (MAXUS 4 and 5) and during the Belgian and Spanish Taxiflight to the ISS. Recently more insight into the colloidal interaction of precursors in suspension was obtained. In the lecture, a summary of the up to now collected insight into the chemistry of nanoslabs will be presented as well as a view into applications of nanoslab based hierarchical materials. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061222/f2e95a26/attachment.htm From hbaruch at bgu.ac.il Fri Dec 22 17:38:50 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-25 Condensed Matter Seminar Message-ID: <200612221538.RAA889424@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 25-12-2006 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Growth patterns of invasive brain tumors SPEAKER: Dr. Evgeniy Khain, Michigan Center for Theoretical Physics, University of Michigan ABSTRACT/COMMENTS: We study the in vitro growth dynamics of malignant brain tumors. A growing tumor consists of a dense proliferating zone and an outer less dense invasive region. Experiments with two different types of cells show qualitatively different behavior: one cell line invades in a spherically symmetric manner, while another gives rise to branches and forms clusters in the invasive region. We reproduced the experimentally observed patterns using both a continuum approach(reaction-diffusion equations) and stochastic discrete modeling. We also showed that above a critical value of cell-cell adhesion large clusters grow from a homogeneous suspension of cells, while below the threshold the system remains homogeneous. The predictions of the model have been verified in a new experiment in which we followed the clustering dynamics of tumor cells on a surface. From hbaruch at bgu.ac.il Sat Dec 23 12:12:27 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-26 Condensed Matter Seminar -Special Message-ID: <200612231012.MAA1436345@tzin.bgu.ac.il> Condensed Matter Seminar -Special DATE: 26-12-2006 TIME: 11:00am -- Tuesday, note special time PLACE: Physics club (Building 29, room 002) TITLE: Communication between biological species: evolutionary and quantitative approaches SPEAKER: Dr. Alex Feigel, Department of Chemistry and Chemical Biology, Harvard University ABSTRACT/COMMENTS: Evolution of social behavior and communication abilities is considered to be one of the most intriguing open scientific problems. It will be demonstrated that emergence of these properties is possible in the populations subjected to specific constraints, e.g. inability to divide resources like small amount of food or mating opportunities in mammals, together with limitations on the rational group decision making, discussed in social science and psychology. Surprisingly, this type of evolution requires an alternating environment (series of different games), periodically favoring and suppressing selfishness in the inter-population interactions. Therefore, there exists no single optimal inter-population game for social evolution, which is assumed in many works. In addition, a method will be presented for a quantitative measurement of chemical signaling of phototactic microorganisms, e.g. Chlamydomonas reinhadtii. From physics at bgu.ac.il Sun Dec 24 09:46:00 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-27 Organic/Biophysics Chemistry Seminar Message-ID: <200612240746.JAA2065429@tzin.bgu.ac.il> Organic/Biophysics Chemistry Seminar DATE: 27-12-2006 TIME: Time: 17:00 PLACE: Bldg. 29 Room 306 (Chemistry Seminar Room) TITLE: \"Molecular design, synthesis and self-assembly of organic materials for nano-electronics\" SPEAKER: Prof. Dmitrii Perepichka, Department of Chemistry, McGill University ABSTRACT/COMMENTS: In 1974 Aviram and Ratner suggested that a single organic molecule can be used as elementary electronic device (a diode). The idea has received much of attention from synthetic chemists and solid state physicists, although the originally proposed molecule, which possesses a unique combination of a strong electron donor and acceptor properties, has never been studied experimentally. I will present our recent advances in synthesis and studies of donor-acceptor molecules with unprecedented electronic properties and their application as molecular diodes. [1, 2] If these (or any other) molecules are to be used in nanoelectronic circuits, they should be precisely positioned on a surface of a chip. In the second part of the talk I will describe how we use self-assembly principles to create a variety of well-defined molecular 2D networks on conducting surfaces and how we modulate the periodicity of the resulted nanopatterns.[3] This approach can be generally applied to assemble a variety of functional organic materials, including conducting polymer wires, in a highly periodic structures. [1] G.Ho, J.R.Heath, M.Kondratenko, D.F.Perepichka, K.Arseneault, M.Pezolet, M.R.Bryce, Chem. Eur. J. 2005, 11, 2914–2922. [2] Z.Wei, M.Kondratenko, L.H.Dao, D.F.Perepichka, Rectifying diodes from asymmetrically functionalized single wall carbon nanotubes, J. Am. Chem. Soc. 2006, 128, 3134–3135. [3] K.G. Nath, O. Ivasenko, J. A. Miwa, H. Dang, J. D. Wuest, A. Nanci, D. F. Perepichka, F. Rosei, J. Am. Chem. Soc. 2006, 128, 4212–4213 From physics at bgu.ac.il Sun Dec 24 11:02:28 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2007-01-25 symposium Message-ID: <200612240902.LAA2159538@tzin.bgu.ac.il> symposium DATE: 25-01-2007 TIME: 25-26/01/07 PLACE: TITLE: \"Order and disorder in condensed matter: from solitons to glasses\" SPEAKER: , ABSTRACT/COMMENTS: Dear Colleague. You are invited to attend the symposium \"Order and disorder in condensed matter: from solitons to glasses\", celebrating Baruch Horovitz\'s 60th birthday, which will take place at Ben Gurion University, January 25-26, 2007. Additional details are available on the website http://physweb.bgu.ac.il/EVENTS/baruch2007 Participation, including meals and accommodation, is free, but requires preregistration on the webpage. Please distribute this announcement among your colleagues and students. We are looking forward to seeing you here. From gideonc at bgu.ac.il Tue Dec 26 01:10:07 2006 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2006-12-28 Physics Colloquium Message-ID: <200612252310.BAA3293556@tzin.bgu.ac.il> Physics Colloquium DATE: 28-12-2006 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Pattern formation in Non-linear Dynamic Systems SPEAKER: Prof. Steve Lipson, Dept. of Physics, Technion ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collp06_files/Lipson.html Refreshments are served at 3:20pm From Ibar at bgu.ac.il Tue Dec 26 17:00:28 2006 From: Ibar at bgu.ac.il (Ilana Bar) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2007-01-02 Lasers Seminar Message-ID: <020601c728fe$94f88e30$d10f4884@ilap> ANNOUNCEMENT==> Lasers Seminar DATE: 02-01-2007 TIME: 3:30pm (Tue) PLACE: Physics club (Building 29, room 002) TITLE: Spectroscopic diagnostics of non-equilibrium plasmas SPEAKER: Prof. Yitzhak Maron, Faculty of Physics, Weizmann Institute of Science, Rehovot ABSTRACT/COMMENTS: We review the use of spectroscopy in the visible to X-ray regions for the determination of the properties of transient plasmas under short-duration energy pulses. Measurements of the electric and magnetic fields will also be described. A study of the propagation of magnetic-field fronts in plasmas, with implications to laboratory and space plasmas, will be reviewed. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061226/1f545732/attachment.htm From hbaruch at bgu.ac.il Wed Dec 27 11:00:44 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2007-01-01 Condensed Matter Seminar Message-ID: <200612270900.LAA4422715@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 01-01-2007 TIME: 11:30am (Mon) PLACE: Physics club (Building 29, room 002) TITLE: Transport under Molecular Scale Confinement SPEAKER: Prof. J. K. Percus, Courant Institute of Mathematical Sciences and Physics Department New York University ABSTRACT/COMMENTS: Technology is increasingly being used, and biological structure increasingly being studied, at the nanometer level, and below. Much of the mechanics can be regarded as classical, with quantum mechanics setting the needed parameters. Such small regions are in a sense all surface, so that the relevance of bulk matter physics is not apparent. However, since typical spatial regions of interest are quasi-one or two dimensional, it is reasonable to expect that the new phenomenology encountered will yield to not very esoteric theory. Here, we will restrict our attention to the quasi-one dimensional regime of structured pores - zeolites in chemical engineering, membrane channels in microbiology - emphasizing the extremes of diffusive and inertial dynamics. In the crowded environment at issue, these resurface as anomalous and normal diffusion, respectively. The strictly one-dimensional case will serve as entree, followed by single-file flow under less crowding, and a drastic qualitative transition when particles can actually hop past each other. T he behavior of a single particle in a structured pore is of course crucial input data; it is itself not trivial and, strangely enough, is still the focus of much study, which will be reported as well. From hbaruch at bgu.ac.il Wed Dec 27 11:07:08 2006 From: hbaruch at bgu.ac.il (hbaruch@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2007-01-01 Condensed Matter Seminar -Special Message-ID: <200612270907.LAA4385288@tzin.bgu.ac.il> Condensed Matter Seminar -Special DATE: 01-01-2007 TIME: 3:00pm Monday -- note special time PLACE: Physics club (Building 29, room 002) TITLE: High fidelity superconducting qubit gates SPEAKER: Dr. Nadav Katz, Physics Department, University of California at Santa Barbara ABSTRACT/COMMENTS: The Josephson phase qubit can be thought of as a \"tunable atom\" where the energy levels used as the qubit are tuned via external controls. The uniquely low impedance of the phase qubit makes it naturally suited for scalable implementations. Recently we have dramatically improved the coherence of our qubits by quantifying the various material defect decoherence pathways, and removing them via optimized fabrication. The resulting near unity fidelity achieved in single-shot measurement and control opens up many possibilities. I will show our recent results for quantum state tomography of one and two qubits. This includes an analysis of qubit evolution due to partial measurement, and the generation and characterization of various Bell-like states in coupled qubits. From nano at bgu.ac.il Fri Dec 29 00:02:55 2006 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2007-03-01 nanotechnology workshop Message-ID: <00e401c72acb$ee5ba6a0$1b0e4884@estinano> Nanotechnology workshop, Wednesday January 03, 12:00 building 29, room 306,Chemistry Department seminar room Title : Recent Progress in Accessing the Nanostructure of Liquid Systems by Cryo-TEM Speaker: Prof. Ishi Talmon Department of Chemical Engineering Technion Abstract: Cryo-TEM has become an indispensable tool to acquire high-resolution direct images of self-aggregating nanostrucutred liquids. The methodology that has been developed over the years allows us to capture the nanostructure in its native state of fixed concentration and temperature. A wide range of systems of low- and high-molecular weight solutes, synthetic and biological, has been studied already by the technique. While most cryo-TEM work has been done on aqueous systems, more recently the technique has been extended to non-aqueous solvents as well. The term ?cryo-TEM? actually refers to two techniques: direct-imaging cryo-TEM, by which a thin vitrified sample is examined by the TEM at cryogenic temperatures, and ?freeze-fracture-replication? cryo-TEM (FFR), by which a carbon-metal replica of the fractured fast-cooled specimen is examined at room temperature by the TEM. The two techniques are complementary, as I will explain in my talk. The presentation will begin with a brief description of the two techniques with emphasis on FFR, a most useful technique that is, unfortunately, quite rarely used nowadays. This will be followed by a discussion of the application of cryo-TEM to non-aqueous systems, pointing out the potential and the difficulties of this type of application. The application cryo-TEM to the study of the mechanism of mesophase formation will be described in the final part of the talk. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20061229/9b04ebdc/attachment.htm From physics at bgu.ac.il Thu Dec 28 15:40:36 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2007-01-04 Special Seminar Message-ID: <200612281340.PAA5348045@tzin.bgu.ac.il> Special Seminar DATE: 04-01-2007 TIME: 14:00am (Thursday) PLACE: Physics club (Building 29, room 002) TITLE: Nuclear Physics and Nuclear Engineering Special Seminar \"Neutron scattering experiments: the problem of absolute normalization and its influence on some recent results\" SPEAKER: Dr Javier Dawidowski, Centro Atmico Bariloche, San Carlos de Bariloche, Argentina ABSTRACT/COMMENTS: From physics at bgu.ac.il Sun Dec 31 12:22:28 2006 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2007-01-03 Organic/Biophysics Chemistry Seminar Message-ID: <200612311022.MAA7633844@tzin.bgu.ac.il> Organic/Biophysics Chemistry Seminar DATE: 03-01-2007 TIME: Wednesday,18:00 PLACE: Bldg. 29 Room 306 (Seminar Room) TITLE: \"In Vivo Incorporation of Unnatural Amino Acids Into Proteins: from Archae to Mammals\" SPEAKER: Dr. Lital Alfonta, Department of biotechnology, Ben-Gurion University of the Negev ABSTRACT/COMMENTS: Recently, we have described how E. coli[1] and S. cerevisiae[2] translational machinery and genetic code can be manipulated in order to introduce unnatural amino acids site specifically into proteins in vivo. Since then numerous unnatural amino acids were incorporated successfully into proteins in both organisms[3]. In both cases an efficient selection scheme was developed in order to evolve a synthetase that will charge the corresponding tRNA only with an unnatural amino acid and not with any of the other 20 natural occurring amino acids. Particularly robust is the system that was developed for the evolution of tyrosyl synthtases in E. coli. where protein expression levels are as high as wild type protein. [4] Here we would like to describe how we have taken advantage of the efficient selection system for the evolution of Methanococcus jannaschii (Mj) TyrRS in E. coli and adapted it for the site specific incorporation of unnatural amino acids into proteins expressed in mammalian cells. The suggested hypotheses for the switch between bacteria to mammalian cells and the approach that was taken to test it will be described in details, by the design of a new hybrid tRNA synthetase and the subsequent incorporation of unnatural amino acids for which tRNA synthetase was evolved in E. coli and then were incorporated into proteins in mammalian cells. -------------------------------------------------------------------------------- [1] L. Wang, A. Brock, B. Herberich, P. G. Schultz, Science, 292, 498 (2001). [2] J. W. Chin, T. A. Cropp, J. A. Anderson, M. Mukherji, Z. Zhang, P. G. Schultz, Science, 301, 964 (2003). [3] L. Wang, P. G. Schultz, Angew Chem Int Ed Engl., 44, 34 (2004). [4] Y. Riu, P. G. Schultz, Nat. Meth., 3, 263 (2006). From gideonc at bgu.ac.il Sun Dec 31 16:24:56 2006 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:24 2009 Subject: [Phys-seminars] 2007-01-04 Physics Colloquium Message-ID: <200612311424.QAA7793587@tzin.bgu.ac.il> Physics Colloquium DATE: 04-01-2007 TIME: 3:30pm (Thu) PLACE: Building 34, room 010 TITLE: Nonlinear physics of water-limited ecosystems SPEAKER: Prof. Ehud Meron, Ben-Gurion University, Department of Physics. ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collp06_files/Meron.html Refreshments are served at 3:20pm