Pages

אפריל 25, 2016

  • Date:07שלישימאי 2024

    Data Drought in the Humid Tropics: How to Overcome the Cloud Barrier in Greenhouse Gas Remote Sensing

    More information
    שעה
    11:00 - 11:00
    מיקום
    בניין משפחת זוסמן
    מרצהYinon Bar-On
    California Institute of Technology
    מארגן
    המחלקה למדעי כדור הארץ וכוכבי הלכת
    צרו קשר
    תקצירShow full text abstract about Quantifying land-atmosphere fluxes of carbon-dioxide (CO2) ...»
    Quantifying land-atmosphere fluxes of carbon-dioxide (CO2)
    and methane (CH4) is essential for evaluating carbonclimate
    feedbacks. Greenhouse gas satellite missions aim to
    provide global observational coverage of greenhouse gas
    concentrations and thus improve inversions of landatmosphere
    exchange fluxes. However, in key regions such
    as the humid tropics current missions obtain very few valid
    measurements. Leveraging recent advances in the global
    analysis of high-resolution optical imagery on cloudcomputing
    platforms and deep learning algorithms for cloud
    segmentation, we quantitatively diagnose the sources for
    low data yields in the tropics. We find that the main cause for
    low data yields are frequent shallow cumulus clouds. We
    find that increasing the spatial resolution of observations to
    200 m would increase yields by 2–3 orders of magnitude
    and allow regular measurements in the wet season. Thus,
    the key to effective tropical greenhouse gas observations
    likely lies in regularly acquiring high-spatial resolution data.
    הרצאה
  • Date:07שלישימאי 2024

    The evolution and development of critical periods of cortical plasticity

    More information
    שעה
    12:30 - 13:30
    מיקום
    אולם הרצאות ע"ש גרהרד שמידט
    מארגן
    המחלקה למדעי המוח
    צרו קשר
    הרצאה
  • Date:07שלישימאי 2024

    Chemical Probes Reveal Mechanisms of Action of Antifungal Drugs and Guide Modifications to Improve Performance

    More information
    שעה
    14:00 - 15:00
    מיקום
    אולם הרצאות ע"ש גרהרד שמידט
    מרצהProf. Micha Fridman
    School of Chemistry Tel-Aviv University
    מארגן
    המחלקה לביולוגיה מבנית וכימית
    צרו קשר
    הרצאה
  • Date:08רביעימאי 2024

    Systems Aging - A Sagol Center for Longevity Meeting

    More information
    שעה
    09:00 - 15:00
    מיקום
    מרכז כנסים על-שם דויד לופאטי
    יושב ראש
    Uri Alon
    כנסים
  • Date:08רביעימאי 2024

    ABC CHATS - Dr. Irit Carmi-Levy

    More information
    שעה
    14:00 - 15:30
    כותרת
    From Bench to Boardroom: My Journey to Leading Personalized Cancer Therapies
    מיקום
    בניין על-שם גרשון ואסתר סאגאן
    מרצהDr. Irit Carmi-Levy
    PhD – GM, CSO & Founder-Aummune
    צרו קשר
    תקצירShow full text abstract about Aummune is a clinical-stage oncology company pioneering a un...»
    Aummune is a clinical-stage oncology company pioneering a unique approach, coupling immunotherapy with patient-tailored platform.
    Our lead molecule—an individualized bispecific T cell engager for solid malignancies— has demonstrated efficacy and safety in several animal models.
    A Phase 1 study with this asset has successfully completed enrollment and is showing encouraging results.
    הרצאה
  • Date:09חמישימאי 2024

    Physics colloquium

    More information
    שעה
    11:15 - 12:30
    כותרת
    Synergistic progress in plasmas: from fusion to astrophysics
    מיקום
    בניין הפיזיקה ע"ש עדנה וק.ב. וייסמן
    מרצהProf. Julien Fuchs
    Laboratoire pour l’Utilisation des Lasers Intenses, CNRS, Ecole polytechnique, France
    מארגן
    המחלקה לפיזיקה של מערכות מורכבות
    צרו קשר
    תקצירShow full text abstract about Over the last decade, several exciting directions have been ...»
    Over the last decade, several exciting directions have been initiated by laser-driven plasmas,
    e.g., compact particle accelerators, inertial fusion and laboratory astrophysics. The first has
    known rapid progress, in terms of current, energy, stability; fusion has gone through a historic
    step, with the news of ignition being achieved at NIF in 2022; and laboratory astrophysics has
    known also spectacular developments, demonstrating the possibility to perform fully scalable
    experiments relevant to various objects such as forming stars and supernovae. A particularly
    interesting aspect is that all these fields are strongly synergistic, i.e., that advances in one can
    push the others as well. I will present examples of such synergies, through recent results
    we have obtained in all these domains, and in particular how ultra-bright neutron beams
    can be developed using latest generation multi-PW lasers [1,2]. These could open interesting
    perspectives in terms of cargo inspection, but also for fusion plasma measurements.
    I will also show how fusion can benefit from external magnetization [3]. Finally, I will discuss
    advances in laboratory astrophysics, particularly the first-stage acceleration of ions leading to
    cosmic rays [4,5], understanding the universal nature of collimated outflows in the Universe [6],
    and probing the intricacy of 3D magnetic reconnection [7]
    [1] High-flux neutron generation by laser-accelerated ions from single-and double-layer targets, V Horný et al.,
    Scientific Reports 12 (1), 19767, 2022
    [2] Numerical investigation of spallation neutrons generated from petawatt-scale laser-driven proton beams,
    B Martinez et al., Matter and Radiation at Extremes 7 (2), 024401, 2022
    [3] Dynamics of nanosecond laser pulse propagation and of associated instabilities in a magnetized underdense
    plasma, W. Yao et al., https://doi.org/10.48550/arXiv.2211.06036
    [4] Laboratory evidence for proton energization by collisionless shock surfing, W Yao et al.,
    Nature Physics 17 (10), 1177-1182, 2021
    [5] Enhancement of the Nonresonant Streaming Instability by Particle Collisions, A Marret et al.,
    Physical Review Letters 128 (11), 115101, 2022
    [6] Laboratory disruption of scaled astrophysical outflows by a misaligned magnetic field, G Revet et al.,
    Nature communications 12 (1), 762, 2021
    [7] Laboratory evidence of magnetic reconnection hampered in obliquely interacting flux tubes, S Bolaños et al.,
    Nature Communications 13 (1), 6426, 2022
    סימפוזיונים
  • Date:09חמישימאי 2024

    Vision and AI

    More information
    שעה
    12:15 - 13:15
    כותרת
    MyVLM: Personalizing VLMs for User-Specific Queries
    מיקום
    בניין יעקב זיסקינד
    מרצהYuval Alaluf
    TAU
    מארגן
    המחלקה למדעי המחשב ומתמטיקה שימושית
    צרו קשר
    תקצירShow full text abstract about LLMs offer users intuitive interfaces for interacting with t...»
    LLMs offer users intuitive interfaces for interacting with textual information. The integration of vision into LLMs through VLMs has enabled these models to "see" and reason over visual content. However, these VLMs possess generic knowledge, lacking a personal touch. This raises an intriguing question: can we equip these models with the ability to comprehend and utilize user-specific concepts, tailored specifically to you? Can we ask the model questions about you, such as what you are wearing or what your friend is doing in the image? In this talk, we will explore how we can personalize VLMs to each user, offering more meaningful interactions that better reflect individual experiences and relationships.

    Bio:

    Yuval is a PhD student at Tel Aviv University under the supervision of Prof. Daniel Cohen-Or. His research centers around leveraging generative models to give users greater control and creative freedom when interacting with visual content. Currently interning at Snap Research under Kfir Aberman, Yuval is also exploring new approaches for personalizing generative models.
    הרצאה
  • Date:09חמישימאי 2024

    Vision and AI

    More information
    שעה
    12:15 - 13:15
    כותרת
    TBA
    מיקום
    בניין יעקב זיסקינד
    מרצהYuval Alaluf
    TAU
    מארגן
    המחלקה למדעי המחשב ומתמטיקה שימושית
    צרו קשר
    תקצירShow full text abstract about TBA ...»
    TBA
    הרצאה
  • Date:09חמישימאי 2024

    Geometric Functional Analysis and Probability Seminar

    More information
    שעה
    13:30 - 14:30
    כותרת
    Exponential volume limits
    מיקום
    בניין יעקב זיסקינד
    מרצהSnir Ben Ovadia
    Penn State
    מארגן
    המחלקה למתמטיקה
    צרו קשר
    תקצירShow full text abstract about Let M be a closed Riemannian manifold, let f be a diffeomorp...»
    Let M be a closed Riemannian manifold, let f be a diffeomorphism of M, and let m the Riemannian volume of M. We prove that if (f^n)*m goes exponentially fast to a measure mu, then mu is an SRB measure. This is joint work with Federico Rodriguez-Hertz.
    הרצאה
  • Date:09חמישימאי 2024

    New STATs on proteasome-mediated tumor inflammation

    More information
    שעה
    14:00 - 15:00
    מיקום
    בניין ע"ש מקס ולילאן קנדיוטי
    מרצהProf. Yifat Merbl
    Department of Systems Immunology Faculty of Biology
    מארגן
    המכון לחקר הטיפול בסרטן עש דואק
    צרו קשר
    הרצאה
  • Date:12ראשוןמאי 2024

    Lake Kinneret in a Changing Environment

    More information
    שעה
    11:00 - 11:00
    מיקום
    בניין משפחת זוסמן
    מרצהYael Amitai
    Israel Oceanographic and Limnological Research, The Yigal Alon Kinneret Limnological Laboratory
    מארגן
    המחלקה למדעי כדור הארץ וכוכבי הלכת
    צרו קשר
    תקצירShow full text abstract about Located in a highly sensitive subtropical climate area and a...»
    Located in a highly sensitive subtropical climate area and a densely populated area, Lake Kinneret is poised to undergo both natural and human-induced transformations in the coming decades. The lake is thermally stratified throughout most of the year and mixes thoroughly each winter when the epilimnion (upper layer) water temperature reaches equilibrium with the hypolimnion (bottom layer) water temperature by surface cooling and turbulence. Both the stratified and the fully mixed periods has a significant role in the Kinneret’s ecological system.

    Observation shows that air above the Lake is warming in a rate of 0.4oC/decade, while the epilimnion and hypolimnion are warming in a rate of 0.3oC/decade and 0.1oC/decade, respectively, for the last 50 years. Therefore, stratification strength and duration is anticipated to change and impact the lake’s ecosystem.

    Additionally, the sequence of drought periods and the expected future rise in water demands from Lake Kinneret formed the basis for the government's decision to channel desalinated water, via the natural course of the Tzalmon Stream, to the lake to ensure its operational functionality at high levels.

    Using a 3D hydrodynamic model forced by short and long-term forecasts the above scenarios are examined and analyzed. A simulation forced by regional atmospheric RCP4.5 climate change scenario spanning from 2010-2070 show continuous warming followed by abrupt cooling of the lake water around the year 2065. This result, presumably due to enhanced latent heat loss, suggest a restrain the dramatic anticipated change in the lake stratification.
    הרצאה
  • Date:15רביעימאי 2024

    Elizabeth Reznik GM Shouval Lab

    More information
    שעה
    10:00 - 11:00
    מיקום
    בניין לביוכימיה על שם נלה וליאון בנוזיו
    מארגן
    המחלקה למדעים ביומולקולריים
    צרו קשר
    תקצירShow full text abstract about Myoblast cell fusion is essential for skeletal muscle develo...»
    Myoblast cell fusion is essential for skeletal muscle development and regeneration. Yet, the molecular machinery that drives myoblast fusion remains incompletely understood. Myoblast cell fusion is an intricate multistep process, making it challenging to identify the specific proteins involved. Until now, no approach was available to capture fusing cells and dissect the dynamic changes in their cellular transitions. To fill this gap, we have developed a method using small-molecule inhibitors to synchronize muscle differentiation ex vivo and capture cells before, during, and after fusion. This allows us to identify and associate proteins with specific stages of muscle cell differentiation and fusion. Using this method, we have identified the Paralemmin A-kinase anchor protein (PALM2-AKAP2), a protein of unknown function, as a potential regulator of muscle regeneration. Hence, this work provides valuable data and will provide new insight into the mechanism of myoblast fusion and muscle regeneration.
    הרצאה
  • Date:15רביעימאי 2024

    Mitochondrial dynamics in health and disease

    More information
    שעה
    11:00 - 12:00
    מיקום
    בניין ע"ש מקס ולילאן קנדיוטי
    מארגן
    המחלקה לאימונולוגיה ורגנרציה ביולוגית
    צרו קשר
    הרצאה
  • Date:15רביעימאי 2024

    Machine Learning and Statistics Seminar

    More information
    שעה
    11:15 - 12:15
    כותרת
    Towards Reverse Algorithmic Engineering of Neural Networks
    מיקום
    בניין יעקב זיסקינד
    מרצהDan Vilenchik
    BGU
    מארגן
    המחלקה למדעי המחשב ומתמטיקה שימושית
    צרו קשר
    תקצירShow full text abstract about As machine learning models get more complex, they can outper...»
    As machine learning models get more complex, they can outperform traditional algorithms and tackle a broader range of problems, including challenging combinatorial optimization tasks. However, this increased complexity can make understanding how the model makes its decisions difficult. Explainable models can increase trust in the model’s decisions and may even lead to improvements in the algorithm itself. Algorithms like GradCAM or SHAP provide good explanations in terms of feature importance, typically for classification tasks. Still, they provide little insight when the ML pipeline is designed to work, for example, as an algorithm for solving optimization problems.                                                                      In this talk, we present a concept-learning framework for explaining a neural machine-learning model’s decision-making process from an algorithmic point of view. Using the NeuroSAT algorithm for SAT solving as a case study, we demonstrate how our framework finds the algorithmic concepts that drive the operation of NeuroSAT. Using the concepts that we discover, we can re-write the black box NeuroSAT net as a text-book algorithm that performs typical algorithmic moves like (a) compute confidence levels for every variable, (b) fix variables with the highest confidence and simplify the instance, (c) solve the residual formula using some simple technique. (Such a principle guides, for example, the well-known Belief-Propagation-Decimation algorithm).

    Joint work with Elad Shoham (PhD student BGU), Kahalil Wattad (MSc student BGU), Hadar Cohen (MSc student BGU), and Havana Rika (Tel-Aviv-Yafo Academic College). 

    Short bio:

    Dan Vilenchik holds a PhD in computer science from Tel Aviv University. He did a postdoc at UC Berkeley and UCLA. He is currently a tenured member of the Electrical Engineering School at Ben-Gurion University. His research includes various aspects of machine learning, such as the challenges of high-dimensional data, explainable AI, NLP, and multidisciplinary projects.

     
    הרצאה
  • Date:16חמישימאי 2024

    Physics Colloquium

    More information
    שעה
    11:15 - 12:30
    כותרת
    Toward Autonomous “Artificial Cells” in 2D
    מיקום
    בניין הפיזיקה ע"ש עדנה וק.ב. וייסמן
    מרצהWeizmann Institute of Science, Prof. Roy Bar-Ziv
    מארגן
    המחלקה לפיזיקה של מערכות מורכבות
    צרו קשר
    תקצירShow full text abstract about We study the assembly of programmable quasi-2D DNA compartme...»
    We study the assembly of programmable quasi-2D DNA compartments as
    “artificial cells” from the individual cellular level to multicellular communication.
    We will describe work on autonomous synthesis and assembly of cellular
    machines, collective modes of synchrony in a 2D lattice of ~1000
    compartments, and a first look at the birth of proteins on a single DNA.
    סימפוזיונים
  • Date:16חמישימאי 2024

    Vision and AI

    More information
    שעה
    12:15 - 13:15
    כותרת
    Large-scale study of human memory for meaningful narratives
    מיקום
    בניין יעקב זיסקינד
    מרצהMisha Tsodyks
    WIS
    מארגן
    המחלקה למדעי המחשב ומתמטיקה שימושית
    צרו קשר
    תקצירShow full text abstract about The statistical study of human memory requires large-scale e...»
    The statistical study of human memory requires large-scale experiments, involving many stimuli conditions and test subjects. While this approach has proven to be quite fruitful for meaningless material such as random lists of words, naturalistic stimuli, like narratives, have until now resisted such a large-scale study, due to the quantity of manual labor required to design and analyze such experiments.
    Large language models (LLMs) have provided the necessary technological breakthrough for this purpose, given their ability to generate human-like text and carry out novel tasks after being prompted by instructions in natural language, without additional training. In this work, we develop a pipeline that uses large language models (LLMs) both to design naturalistic narrative stimuli for large-scale recall and recognition memory experiments, as well as to analyze the results. We performed online memory experiments with a large number of participants and collected recognition and recall data for narratives of different sizes. We found that both recall and recognition performance scale linearly with narrative length
    הרצאה
  • Date:16חמישימאי 2024

    Geometric Functional Analysis and Probability Seminar

    More information
    שעה
    13:30 - 14:30
    כותרת
    Asymptotic analysis in some problems with fractional Brownian motion
    מיקום
    בניין יעקב זיסקינד
    מרצהPavel Chigansky
    HUJI
    מארגן
    המחלקה למתמטיקה
    צרו קשר
    תקצירShow full text abstract about Some problems in the theory and applications of stochastic p...»
    Some problems in the theory and applications of stochastic processes reduce to solving integral equations with their covariance operators. Usually, such equations do not have explicit solutions, but useful information can still be extracted through asymptotic analysis with respect to relevant parameters. In this talk, I will survey some recent results on such equations for processes related to the fractional Brownian motion: applications include the problem of small deviations, linear filtering, and statistical inference.
    הרצאה
  • Date:19ראשוןמאי 202420שנימאי 2024

    Executive Board and committee meetings 2024

    More information
    שעה
    כל היום
    מיקום
    מרכז כנסים על-שם דויד לופאטי
    צרו קשר
    מועצת המנהלים הבינלאומית
  • Date:19ראשוןמאי 2024

    Floods in a warming climate: what are the missing puzzle pieces?

    More information
    שעה
    11:00 - 11:00
    מיקום
    בניין משפחת זוסמן
    מרצהEfrat Morin
    The Hebrew University of Jerusalem
    מארגן
    המחלקה למדעי כדור הארץ וכוכבי הלכת
    צרו קשר
    תקצירShow full text abstract about Flood is the outcome of complex processes interacting at a r...»
    Flood is the outcome of complex processes interacting at a range of scales. Flood generation and its magnitude depend on different precipitation and surface properties. As the climate becomes warmer globally, precipitation patterns are changing and, consequently, altering flood regimes. Resolving the expected changes in flood properties requires examining projections of precipitation features most correlated with floods. While the redistribution of mean annual precipitation amounts is generally known, the trends in many other essential factors controlling floods are yet to be resolved. For example, flash flood magnitude is sensitive to space-time rainstorm properties such as areal coverage or storm speed. Still, knowledge of how these properties are affected by global warming is lacking. Maximal rain rates for duration relevant to the watershed’s response time are also crucial parameters controlling the flood discharge. There is some understanding of how extreme rain rates change, but the magnitude and sign depend on the rain duration considered. Changes in frequency and the intra-seasonal distribution of precipitation events also affect flood regimes. Finally, watersheds of different properties are sensitive to different precipitation features, and thus, different watersheds may respond differently to global warming. In this talk, we will present the complexity of flood response under global warming and then focus on two questions: 1) how does global warming affect heavy precipitation events (HPEs) in the eastern Mediterranean, and 2) how these effects are imprinted in the resulting floods in small-medium Mediterranean watersheds.
    We simulated 41 eastern Mediterranean HPEs with the high-resolution weather research and forecasting (WRF) model. Each event was simulated twice: under historical conditions and at the end of the 21st-century conditions (RCP8.5 scenario) using the “pseudo global warming” approach. Comparison of precipitation patterns from the paired simulations revealed that heavy precipitation events in our region are expected to become drier and more spatiotemporally concentrated, i.e., we expect higher rain rates on smaller coverage areas and shorter storm durations that, in total, yield lower amounts of rainfall.
    These effects have some contradicting signs, and their full hydrological impact on streamflow peak discharge and volume was further explored. Ensembles of spatially-shifted rainfall data from the simulated HPEs were input to a high-resolution distributed hydrological model (GB-HYDRA) representing four small-medium-size watersheds (18–69 km2) in the eastern Mediterranean (Ramot Menashe). Flow volume is significantly reduced in future HPEs, while the change in flood peak is more complicated due to the combined effect of precipitation amount (decreasing) and precipitation rate (increasing). For the watersheds examined in this research, which are mostly agricultural, flood peaks at the watershed outlets are mostly reduced. The dynamics of flood generation at sub-watersheds of different sizes and properties are further examined in this research to understand scenarios for lowering or increasing flood peaks. This study emphasizes that detecting and quantifying global warming impact on space-time precipitation patterns is essential for flood regime projection.
    הרצאה
  • Date:20שנימאי 2024

    Special Guest Seminar

    More information
    שעה
    11:00 - 12:00
    כותרת
    Tissue Stem Cells: Making Choices and Living with Them in Good Times and Bad
    מיקום
    אולם ע"ש דולפי ולולה אבנר
    מרצהProf. Elaine Fuchs
    מארגן
    המחלקה לאימונולוגיה ורגנרציה ביולוגית
    צרו קשר
    הרצאה

Pages