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  • Date:29שלישיינואר 2019

    To be announced

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    שעה
    10:00 - 10:30
    מיקום
    בניין לביוכימיה על שם נלה וליאון בנוזיו
    Auditorium
    מרצה
    Rona Aviram
    Department of Biomolecular Sciences-WIS
    מארגן
    המחלקה למדעים ביומולקולריים
    צרו קשר
    הרצאה
  • Date:29שלישיינואר 2019

    To be announced

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    שעה
    10:30 - 11:00
    מיקום
    בניין לביוכימיה על שם נלה וליאון בנוזיו
    Auditorium
    מרצה
    Hadas Sar Shalom
    Department of Biomolecular Sciences - WIS
    מארגן
    המחלקה למדעים ביומולקולריים
    צרו קשר
    הרצאה
  • Date:29שלישיינואר 2019

    Need for new theory and simulations to understand protein behavior in cells

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    שעה
    14:00 - 15:00
    מיקום
    בניין הלן ומילטון קימלמן
    Dov Elad Room
    מרצה
    Prof. Gary J. Pielak
    Department of Chemistry, University of North Carolina at Chapel Hill, USA
    מארגן
    המחלקה למדעים ביומולקולריים , המחלקה לביולוגיה מבנית
    צרו קשר
    הרצאה
  • Date:31חמישיינואר 2019

    Physics Colloquium

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    שעה
    11:15 - 12:30
    מיקום
    בניין הפיסיקה ע"ש עדנה וק.ב. וייסמן
    Auditorium
    מרצה
    Charlie Markus
    University of Copenhagen
    מארגן
    הפקולטה לפיסיקה
    צרו קשר
    פרטים נוספיםShow full text description of 11:00 – coffee, tea, and more...»
    11:00 – coffee, tea, and more
    תקצירShow full text abstract about TBA ...»
    TBA
    סימפוזיונים
  • Date:31חמישיינואר 2019

    Evolution of cell fusion

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    שעה
    14:00 - 15:00
    כותרת
    Special Guest Seminar
    מיקום
    בניין ע"ש מקס ולילאן קנדיוטי
    Auditorium
    מרצה
    Prof. Benjmain Podbilewicz
    Department of Biology, Technion,Haifa
    מארגן
    המחלקה לבקרה ביולוגית
    צרו קשר
    הרצאה
  • Date:03ראשוןפברואר 2019

    Israel AGT day

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    שעה
    08:00 - 16:30
    מיקום
    מרכז כנסים על-שם דויד לופאטי
    יושב ראש
    Shahar Dobzinski
    צרו קשר
    כנסים
  • Date:03ראשוןפברואר 2019

    The biomass distribution on earth

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    שעה
    11:00
    מיקום
    בניין משפחת זוסמן
    M. Magaritz Seminar Room
    מרצה
    Ron Milo
    Department of Plant and Environmental Sciences Weizmann Institute of Science
    מארגן
    המחלקה למדעי כדור הארץ וכוכבי הלכת
    צרו קשר
    הרצאה
  • Date:04שניפברואר 2019

    "Palladium-Catalyzed Carbon-Heteroatom Bond-Forming Reactions for the Functionalization of Molecules Big and Small"

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    שעה
    11:00 - 12:15
    מיקום
    אולם ע"ש דולפי ולולה אבנר
    מרצה
    Prof. Stephen L. Buchwald
    Department of Chemistry, MIT
    מארגן
    הפקולטה לכימיה
    צרו קשר
    סימפוזיונים
  • Date:04שניפברואר 2019

    Foundations of Computer Science Seminar

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    שעה
    14:30 - 16:00
    כותרת
    The Power of Distributed Verifiers in Interactive Proofs
    מיקום
    בניין יעקב זיסקינד
    Room 155
    מרצה
    Eylon Yogev
    Technion
    מארגן
    הפקולטה למתמטיקה ומדעי המחשב
    Faculty of Mathematical Sciences Seminar, המחלקה למדעי המחשב ומתמטיקה שימושית
    Faculty of Mathematical Sciences Seminar, המחלקה למתמטיקה
    Faculty of Mathematical Sciences Seminar
    צרו קשר
    פרטים נוספיםShow full text description of We explore the power of interactive proofs with a distribute...»
    We explore the power of interactive proofs with a distributed verifier. In this setting, the verifier consists of n nodes and a graph G that defines their communication pattern. The prover is a single entity that communicates with all nodes by short messages. The goal is to verify that the graph G belongs to some language in a small number of rounds, and with small communication bound, i.e., the proof size.

    This interactive model was introduced by Kol, Oshman and Saxena (PODC 2018) as a generalization of non-interactive distributed proofs. They demonstrated the power of interaction in this setting by constructing protocols for problems as Graph Symmetry and Graph Non-Isomorphism -- both of which require proofs of (n^2)-bits without interaction.

    In this work, we provide a new general framework for distributed interactive proofs that allows one to translate standard interactive protocols (i.e., with a centralized verifier) to ones where the verifier is distributed with a proof size that depends on the computational complexity of the verification algorithm run by the centralized verifier. We show the following:

    * Every (centralized) computation performed in time O(n) on a RAM can be translated into three-round distributed interactive protocol with O(log n) proof size. This implies that many graph problems for sparse graphs have succinct proofs (e.g., testing planarity).

    * Every (centralized) computation implemented by either a small space or by uniform NC circuit can be translated into a distributed protocol with O(1) rounds and O(log n) bits proof size for the low space case and polylog(n) many rounds and proof size for NC.

    * We show that for Graph Non-Isomorphism, one of the striking demonstrations of the power of interaction, there is a 4-round protocol with O(log n) proof size, improving upon the O(n*log n) proof size of Kol et al.

    * For many problems, we show how to reduce proof size below the seemingly natural barrier of log n. By employing our RAM compiler, we get a 5-round protocol with proof size O(loglog n) for a family of problems including Fixed Automorphism, Clique and Leader Election (for the latter two problems we actually get O(1) proof size).

    * Finally, we discuss how to make these proofs non-interactive {em arguments} via random oracles.

    Our compilers capture many natural problems and demonstrate the difficulty in showing lower bounds in these regimes.
    Joint work with Moni Naor and Merav Parter.
    הרצאה
  • Date:04שניפברואר 2019

    Ph.D thesis defense: Electromechanical properties of Gd-doped ceria films free of mechanical constraints

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    שעה
    15:00 - 16:30
    מיקום
    בניין פרלמן למדעי הכימיה
    Room 404
    מרצה
    Eran Mishuk
    Dept. Materials and Interfaces
    מארגן
    המחלקה לחומרים ופני שטח
    צרו קשר
    תקצירShow full text abstract about Electrostriction is a second order electro-mechanical coupli...»
    Electrostriction is a second order electro-mechanical coupling that exists in all dielectrics. Classical electrostriction describes anharmonic perturbation of the chemical bonds in the lattice, which gives rise to changes in the average position of atoms. It was found that the mechanism of electrostriction in gadolinium doped ceria (CGO) is fundamentally different from that of classical electrostriction, in which high electrostriction goes together with a large dielectric constant. The mechanism of electrostriction in CGO is not known yet. However, the current hypothesis attributes it to rearrangement of local distortions in the fluorite lattice.
    This PhD thesis presents investigation of non-classical electrostriction effect in self-supported films of gadolinium doped ceria: dependence of the electrostriction strain coefficient on frequency and magnitude of the electric field and mechanical fatigue in thin films. Using self-supported Al/Ti/CGO/Ti/Al structure, I also identified electro-chemo-mechanical effect, which was previously considered unfeasible actuation mechanism at room temperature. The processes presented in this work provide a technological basis for integrating CGO as an active material in electro-active ceramic MEMS (microelectromechanical system)-actuation devices.
    הרצאה
  • Date:05שלישיפברואר 201907חמישיפברואר 2019

    Soft semiconductors

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    שעה
    08:00 - 08:00
    מיקום
    מרכז כנסים על-שם דויד לופאטי
    President's Auditorium
    יושב ראש
    Omer Yaffe
    צרו קשר
    כנסים
  • Date:05שלישיפברואר 2019

    Chaim Leib Pekeris 26th Memorial Lecture

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    שעה
    10:30
    מיקום
    אולם ע"ש דולפי ולולה אבנר
    מרצה
    Prof. Tim Roughgarden
    Columbia University
    מארגן
    הפקולטה למתמטיקה ומדעי המחשב
    צרו קשר
    הרצאה
  • Date:05שלישיפברואר 2019

    The molecular mechanism of Respiratory Syncytial virus assembly

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    שעה
    14:00 - 15:00
    מיקום
    בניין הלן ומילטון קימלמן
    Dov Elad Room
    מרצה
    Dr. Monika Bajorek
    from INRA, France
    מארגן
    המחלקה לביולוגיה מבנית
    צרו קשר
    הרצאה
  • Date:06רביעיפברואר 2019

    Developmental Club Series 2018-2019

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    שעה
    10:00
    מיקום
    בניין ארתור ורושל בלפר למחקר ביורפואי
    Botnar Auditorium
    מרצה
    Prof. Oren Schuldiner
    מארגן
    המחלקה לגנטיקה מולקולרית
    Developmental Club
    צרו קשר
    הרצאה
  • Date:06רביעיפברואר 2019

    Field and Laboratory Studies of Ice Nucleation by Organic Aerosols: Insights on Phase Transitions and Glass Formation

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    שעה
    11:00
    מיקום
    בניין משפחת זוסמן
    M. Magaritz Seminar Room
    מרצה
    Prof. Daniel Cziczo
    Earth, Atmospheric and Planetary Sciences Civil and Environmental Engineering Massachusetts Institute of Technology
    מארגן
    המחלקה למדעי כדור הארץ וכוכבי הלכת
    צרו קשר
    הרצאה
  • Date:06רביעיפברואר 2019

    Extension of in-situ nanoindentation results by (S)TEM graphical data processing

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    שעה
    11:00 - 12:00
    מיקום
    בניין פרלמן למדעי הכימיה
    Room 404
    מרצה
    Dr. Vasily A. Lebedev
    Lomonosov Moscow State University, Moscow
    מארגן
    המחלקה לחומרים ופני שטח
    צרו קשר
    תקצירShow full text abstract about Nanomechanical measurements allow us to determine mechanic...»

    Nanomechanical measurements allow us to determine mechanical characteristics of nano- and microobjects, which is required for further calculations of the mechanical parameters of the structures based on them. At the same time, in-situ measurements are carried out in the SEM and TEM chambers. Thus, it is possible to acquire graphic information that can supplement the indentation data.
    In this work, indentation of titania microspheres with different phase composition was tested by MEMS-based Hysitron PI-95 at Zeiss Libra 200MC TEM. Evaluation of the mechanical properties of microspheres in the elastic region was made according to the Hertz model. It turned out that annealing of the amorphous titania leads to an increase in the Young modulus, whereas the hydrothermal treatment reduces it from 27 to 4 Gpa. The differences in the destruction process was demonstrated for these kinds of particles. It has been shown, that hydrothermal treatment of titania microspheres leads to the formation of a reticular internal structure, whereas annealing results in sintering of the internal structure of microspheres.
    In the process of indentation, corresponding videos were also recorded, including the probe approach, indentation, and destruction of the microspheres. In order to process the videos we coded the program based on free Python packages. Using the Digital Image Correlation (DIC) algorithm, relative probe displacements were measured during indentation (Fig. 1a). The results obtained allowed us to clarify the calibration of the movement of the indenter in free sample tests, as well as to determine the drift function in real measurements. These results are important for long-term measurements, in particular creep tests.
    Based on graphical data we were able to determine the evolution of the shape of indented microspheres. During the video processing, areas of individual objects were determined, sizes of contact areas were calculated, and changes in linear dimensions of the deformed objects were determined (Fig. 1b). Therefore, a large amount of quantitative data was obtained from electron microscopy images.


    Fig.1 Illustration of probe displacement determination (a) and the shape evolution analysis
    הרצאה
  • Date:07חמישיפברואר 2019

    Chemical and Biological Physics Guest Seminar

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    שעה
    11:00
    כותרת
    Interactions of hydrophobic nanoparticles with biological membrane
    מיקום
    בניין פרלמן למדעי הכימיה
    Room 404
    מרצה
    Prof. Matej Daniel
    Czech Technical University, Prague
    מארגן
    המחלקה לפיסיקה כימית וביולוגית
    צרו קשר
    תקצירShow full text abstract about Small hydrophobic gold nanoparticles with a diameter lower t...»
    Small hydrophobic gold nanoparticles with a diameter lower than the membrane thickness can form clusters or uniformly distribute within the hydrophobic core of the bilayer. The coexistence of two stable phases (clustered and dispersed) indicates the energy barrier between nanoparticles. It could be shown, that the forces between the nanoparticles embedded in the biological membrane could be either attractive or repulsive, depending on the mutual distance between them.
    הרצאה
  • Date:07חמישיפברואר 2019

    Frustrations in the treatment of Ovarian Cancer

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    שעה
    14:00 - 15:00
    כותרת
    Special Guest Seminar
    מיקום
    בניין ע"ש מקס ולילאן קנדיוטי
    Auditorium
    מרצה
    Prof. Uziel Beller
    Shaare Zedek Medical Center Jerusalem & Assuata Ashdod
    מארגן
    המחלקה לבקרה ביולוגית
    צרו קשר
    הרצאה
  • Date:07חמישיפברואר 2019

    Pelletron meeting - by invitation only

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    שעה
    16:00 - 17:45
    צרו קשר
    הרצאה
  • Date:10ראשוןפברואר 2019

    Recovering exact conditions at semi-local DFT cost to mitigate energy and density errors for transition metal chemistry


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    שעה
    14:00 - 15:00
    מיקום
    בניין פרלמן למדעי הכימיה
    Room 404
    מרצה
    Prof. Heather Kulik
    Dept. Chemical Engineering, MIT
    מארגן
    המחלקה לחומרים ופני שטח
    צרו קשר
    תקצירShow full text abstract about Accurate prediction of electronic properties of open-shell t...»
    Accurate prediction of electronic properties of open-shell transition metal complexes is essential for materials design and catalysis. Nevertheless, the properties that make these materials and molecules so compelling also make them extremely challenging to study accurately with any computational model. Although density functional theory (DFT) remains the method of choice for its balance of speed and accuracy in computational screening, semi-local approximations in density functional theory (DFT), such as the generalized gradient approximation (GGA), suffer from many electron self-interaction errors that causes them to predict erroneous spin states and geometries, barrier heights and dissociation energies, and orbital energies, to name a few. I will outline our recent efforts to both understand and correct these errors with a focus on predictive modeling of transition metal chemistry : i) We describe how common approximations to recover the derivative discontinuity (i.e., DFT+U and global or range separated hybrids) affect the density properties of transition metal complexes and correlated solids with respect to exact references, ii) We demonstrate recovery of the flat-plane condition that is a union of the requirement of piecewise linearity with electron removal or addition as well as unchanged energy when changing the spin of an electron in isoenergetic orbitals. We accomplish this at no computational cost over semi-local DFT by building from scratch our judiciously-modified DFT (jmDFT) functionals designed to oppose errors inherent in semi-local functionals. We show the connection to but divergence of these functional forms from hybrid expressions and standard DFT+U explain why both common approximations increase static correlation errors. We also present fundamental expressions for determining these parameters, mitigating any empiricism in the method. iii) Finally, time permitting, I will describe our efforts to overcome DFT inaccuracies through the development of data-driven structure-method relationships, including in artificial neural networks that can predict sensitivity of spin-state ordering in transition metal complexes to changes in the exchange-correlation functional.



    הרצאה

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