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מרץ 25, 2015
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Date:29שנימאי 2023סימפוזיונים
Solar Panels for Light-to-Chemical Conversion
More information שעה 11:00 - 12:15כותרת 2023 G.M.J. SCHMIDT MEMORIAL LECTUREמיקום אולם הרצאות ע"ש גרהרד שמידטמרצה Prof. Erwin Reisner
Department of Chemistry, University of Cambridgeמארגן הפקולטה לכימיהדף בית צרו קשר תקציר Show full text abstract about Solar panels are well known to produce electricity, but they...» Solar panels are well known to produce electricity, but they are also in early-stage development for the production of sustainable fuels and chemicals. These panels mimic plant leaves in shape and function as demonstrated for overall solar water splitting to produce green H2 by the laboratories of Nocera and Domen.1,2
This presentation will give an overview of our recent progress to construct prototype solar panel devices for the conversion of carbon dioxide and solid waste streams into fuels and higher-value chemicals through molecular surface-engineering of solar panels with suitable catalysts. Specifically, a standalone ‘photoelectrochemical leaf’ based on an integrated lead halide perovskite-BiVO4 tandem light absorber architecture has been built for the solar CO2 reduction to produce syngas.3 Syngas is an energy-rich gas mixture containing CO and H2 and currently produced from fossil fuels. The renewable production of syngas may allow for the synthesis of renewable liquid oxygenates and hydrocarbon fuels. Recent advances in the manufacturing have enabled the reduction of material requirements to fabricate such devices and make the leaves sufficiently light weight to even float on water, thereby enabling application on open water sources.4 The tandem design also allows for the integration of biocatalysts and the selective and bias-free conversion of CO2-to-formate has been demonstrated using enzymes.5 The versatility of the integrated leaf architecture has been demonstrated by replacing the perovskite light absorber by BiOI for solar water and CO2 splitting to demonstrate week-long stability.6
An alternative solar carbon capture and utilisation technology is based on co-deposited semiconductor powders on a conducting substrate.2 Modification of these immobilized powders with a molecular catalyst provides us with a photocatalyst sheet that can cleanly produce formic acid from aqueous CO2.7 CO2-fixing bacteria grown on such a ‘photocatalyst sheet’ enable the production of multicarbon products through clean CO2-to-acetate conversion.8 The deposition of a single semiconductor material on glass gives panels for the sunlight-powered conversion plastic and biomass waste into H2 and organic products, thereby allowing for simultaneous waste remediation and fuel production.9 The concept and prospect behind these integrated systems for solar energy conversion,10 related approaches,11 and their relevance to secure and harness sustainable energy supplies in a fossil-fuel free economy will be discussed. -
Date:29שנימאי 2023הרצאה
Foundations of Computer Science Seminar
More information שעה 11:15 - 12:30כותרת The Randomized k-Server Conjecture is False!מיקום בניין יעקב זיסקינדמרצה Yuval Rabani
Hebrew University of Jerusalemמארגן המחלקה למדעי המחשב ומתמטיקה שימושיתצרו קשר -
Date:30שלישימאי 2023הרצאה
Site-Specific Isopeptide Bond Formation: A Powerful Tool for the Generation of Potent and Nontoxic Antimicrobial Peptides
More information שעה 10:00 - 11:00מיקום בניין לביוכימיה על שם נלה וליאון בנוזיומרצה Dr. Naiem Wani
Dept. of Biomolecular Sciences-WISמארגן המחלקה למדעים ביומולקולרייםצרו קשר -
Date:30שלישימאי 2023הרצאה
Homogeneous (De)hydrogenative Catalysis for a Circular Economy
More information שעה 11:00 - 12:00מיקום אולם הרצאות ע"ש גרהרד שמידטמרצה Dr. Amit Kumar
School of Chemistry, University of St. Andrews, St. Andrews, KY169ST, UKמארגן המחלקה לכימיה מולקולרית ולמדע חומריםצרו קשר תקציר Show full text abstract about The development of sustainable methods for the closed-loop p...» The development of sustainable methods for the closed-loop production and recycling of plastics is an important challenge of current times. Reactions based on catalytic (de)hydrogenation are atom-economic, and sustainable routes for organic transformations.1 Using the following examples, this lecture will discuss the application of homogeneous (de)hydrogenative catalysis for the synthesis and degradation of polymers to enable a circular economy: (a) synthesis of polyamides/nylons from the ruthenium catalysed dehydrogenative coupling of diamines and diols and its reverse reaction i.e. hydrogenative depolymerisation of nylons,2 (b) synthesis of polyureas from the ruthenium/manganese catalysed dehydrogenative coupling of diamines3,4 and methanol, and its reverse reaction, i.e. hydrogenative depolymerisation of polyureas (Figure 1B)5, (c) Synthesis of polyethyleneimines from manganese catalysed coupling of ethylene glycol and ethylenediamine or the self-coupling of ethanolamine,6 and (d) Synthesis of polyureas and polyurethanes from the dehydrogenative coupling of diformamides and diamines/diols and its reverse reaction i.e. hydrogenative depolymerisation of polyureas and polyurethanes to diformamides and diamines/diols.7 Some applications of some of the polymers made using dehydrogenative processes in the field of batteries will also be discussed.8 -
Date:30שלישימאי 2023הרצאה
Bacterial community indicators to monitor the health of our changing environment
More information שעה 11:30 - 12:30מיקום https://weizmann.zoom.us/j/92703563162?pwd=cW5pb0Nzcm1XS2RObyt6NVZHRUFHUT09מרצה Prof. Gavin Lear
University of Aucklandמארגן המחלקה למדעי הצמח והסביבהצרו קשר -
Date:30שלישימאי 2023הרצאה
Cognitive neuroscience of learning and memory in human infants
More information שעה 12:30 - 13:30מיקום אולם הרצאות ע"ש גרהרד שמידטמרצה Prof. Nick Turk-Browne
Dept of Psychology, Yale Universityמארגן המחלקה למדעי המוחצרו קשר תקציר Show full text abstract about In this talk, I will present the approach my lab has develop...» In this talk, I will present the approach my lab has developed for performing fMRI studies in awake infants during cognitive tasks. I will share some of our recent studies and highlight some of the big open questions that remain to be addressed, with potential to reveal the brain systems underlying how infants perceive and attend to their environment, why infants are such proficient learners, and why we all have amnesia for infant experiences. Despite countless limitations and challenges at present, this work suggests that awake infant fMRI could become more feasible, useful, and ubiquitous in cognitive neuroscience.
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Date:30שלישימאי 2023הרצאה
Electrosome assembly: a first look at the structural principles underlying ion channel biogenesis
More information שעה 14:00 - 15:00מיקום אולם הרצאות ע"ש גרהרד שמידטמרצה Prof. Daniel Minor
Departments of Biochemistry & Biophysics University of California San Franciscoמארגן המחלקה לביולוגיה מבנית וכימיתצרו קשר -
Date:01חמישייוני 2023הרצאה
Evolution in a Cup – use of small-scale bioreactors to study dynamics of microorganism
More information שעה 09:00 - 10:00מיקום בניין ע"ש מקס ולילאן קנדיוטימרצה Dr. Ghil Jona
The Bacteriology & Genomic Repository Unitמארגן המחלקה לתשתיות מחקר מדעי החייםצרו קשר -
Date:01חמישייוני 2023סימפוזיונים
Physics Colloquium
More information שעה 11:15 - 12:30כותרת Elastic Strain Engineering for Unprecedented Propertiesמיקום בניין הפיזיקה ע"ש עדנה וק.ב. וייסמןמרצה Prof. Ju Li
MIT – Cambridge, Massachusetts, USAמארגן הפקולטה לפיזיקהצרו קשר תקציר Show full text abstract about The emergence of “ultra-strength materials” that can withsta...» The emergence of “ultra-strength materials” that can withstand significant fractions of the ideal strength at component scale without any inelastic relaxation harbingers a new field within mechanics of materials. Recently, we have experimentally achieved more than 13% reversible tensile strains in Si that fundamentally redefines what it means to be Si, and ~7% uniform tensile strain in micron-scale single-crystalline diamond bridge arrays, where thousands of transistors and quantum sensors can be integrated in one diamond microbridge. Elastic Strain Engineering (ESE) aims to endow material structures with very large stresses and stress gradients to guide electronic, photonic, and spin excitations and control energy, mass, and information flows. As “smaller is stronger” for most engineering materials at room temperature, a much larger dynamical range of tensile-and-shear deviatoric stresses for small-scale structures can be achieved, as the defect (e.g., dislocation, crack) population dynamics change from defect-propagation to defect-nucleation controlled. Thus, all six stress components can be used to tune the physical and chemical properties of a material like a 7-element alloy. Four pillars of ESE need to be addressed experimentally and computationally: (a) making materials and structures that can withstand deviatoric elastic strain patterns that are exceptionally large and extended in space-time volume, inhomogeneous, dynamically reversible, or combinations thereof, (b) measuring and understanding how functional properties such as photonic and electronic characteristics vary with imposed elastic strain tensor, (c) characterizing and modeling the mechanisms of stress relaxations; the goal is not to use them for forming but to defeat them at service temperatures (usually room temperature and above) and extended timescales, and (d) computational design based on first principles, e.g. predicting ideal strength surface, topological changes in band structures, etc. assisted by machine learning.
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Date:01חמישייוני 2023הרצאה
Vision and AI
More information שעה 12:15 - 13:15כותרת Spaceborne multi-view computational tomography (CT)מיקום בניין יעקב זיסקינדמרצה Yoav Schechner
Technionמארגן המחלקה למדעי המחשב ומתמטיקה שימושיתצרו קשר תקציר Show full text abstract about We describe new computer vision tasks stemming from upcoming...» We describe new computer vision tasks stemming from upcoming multiview tomography from space. Solutions involve both novel imaging hardware and computational algorithms, based on machine learning and differential rendering. This can transform climate research and medical X-ray CT. The key idea is that advanced computing can enable computed tomography of volumetric scenes, based scattered radiation. We describe an upcoming space mission (CloudCT, funded by the ERC). It has 10 nano-satellites that will fly in an unprecedented formation, to capture the same scene (cloud fields) from multiple views simultaneously, using special cameras. The satellites and cameras are built now. They - and the algorithms - are specified to meet computer vision tasks, including geometric and polarimetric self-calibration in orbit, and estimation of 3D volumetric distribution of matter and microphysical properties. Deep learning and differential rendering enable analysis to scale to big data downlinked from orbit. Core ideas are generalized for medical X-ray imaging, to enable significant reduction of dose and acquisition time, while extracting chemical properties per voxel. The creativity of the computer vision and graphics communities can assist in critical needs for society, and this talk points out relevant challenges. -
Date:01חמישייוני 2023הרצאה
Volatile cortical working memory representations crystalize with practice
More information שעה 12:30 - 13:30מיקום בניין ארתור ורושל בלפר למחקר ביורפואימרצה Prof. Peyman Golshani
David Geffen School of Medicine, UCLAמארגן המחלקה למדעי המוחצרו קשר תקציר Show full text abstract about Working memory (WM), the process through which information i...» Working memory (WM), the process through which information is transiently maintained and manipulated over a brief period of time, is essential for most cognitive functions. However, the mechanisms underlying the generation and stability of WM neuronal representations at the population level remain elusive. To uncover these mechanisms, we trained head-fixed mice to perform an olfactory working memory task and used optogenetics to delineate circuits causal for behavioral performance. We used mesoscopic and light bead two photon imaging to record from up to 35,000 secondary motor cortical neurons simulataneously across multiple days and show differential stabilization of different task parameters with learning and practice of the task. We find that cortical working memory representations causal for task performance are highly volatile but only stabilize after multiple days of practice well after task learning. We hypothesize that representational drift soon after learning may allow for higher levels of flexibility for new task rules.
I will also review some of the new open-source tools developed for large-scale imaging of neural activity patterns in freely behaving animals.
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Date:01חמישייוני 2023הרצאה
Ben May Lecutre Series
More information שעה 14:00 - 15:00כותרת Coherence Maps and State-to-State Pathways of Excitation Energy Transferמיקום בניין המנהלה ע"ש סטוןמרצה Prof Nancy Makri
University of Illinois at Urbana-Champaignמארגן מרכז לתיאוריה כימית וחישוביות על שם בן מייצרו קשר תקציר Show full text abstract about The interplay among electronic coherence, vibrational dampin...» The interplay among electronic coherence, vibrational damping, quantum dispersion, topological effects and thermal fluctuations leads to rich behaviors in the dynamics of excitation energy flow. We use real-time path integral methods developed in our group to perform fully quantum mechanical simulations of excitation energy transfer in large molecular aggregates. The systems are described through a Frenkel exciton Hamiltonian where all vibrational normal modes of each molecular unit and their coupling to the ground and excited electronic states are treated explicitly at any temperature. Simulations have been carried out in J aggregates of perylene bisimide, model dendrimers, and photosynthetic light harvesting complexes. Coherence maps offer powerful visualization tools that reveal the creation and destruction of quantum superpositions and enable a state-to-state pathway analysis of energy flow. -
Date:01חמישייוני 2023הרצאה
Somatic mutation in normal tissues
More information שעה 14:00 - 15:00מרצה Dr. Inigo Martincorena
Group Leader, Sanger Institute, Cambridge, UK.מארגן המכון לחקר הטיפול בסרטן עש דואקצרו קשר -
Date:04ראשוןיוני 2023הרצאה
Special guest seminar
More information שעה כל היוםכותרת T cell memory, metabolism and the microbiomeמיקום בניין ע"ש מקס ולילאן קנדיוטימרצה Professor Sammy Bedoui מארגן המחלקה לאימונולוגיה ורגנרציה ביולוגיתצרו קשר -
Date:04ראשוןיוני 2023הרצאה
Paleoclimate reconstruction using speleothems in dry and cold regions.
More information שעה 11:00 - 12:00מיקום בניין משפחת זוסמןמרצה Anton Vaks
GSI, Israelמארגן המחלקה למדעי כדור הארץ וכוכבי הלכתצרו קשר -
Date:06שלישייוני 2023הרצאה
Chemical and Biological Physics Guest Seminar
More information שעה 10:00 - 11:00כותרת Materials with a twist: atomically controlled interfaces for clean energyמיקום בניין פרלמן למדעי הכימיהמרצה Prof Magali Lingenfelder
Max Planck-EPFL Laboratory for Molecular Nanoscience and Technology, Ecole Polytechnique Federale de Lausanne (EPFL)מארגן המחלקה לפיזיקה כימית וביולוגיתצרו קשר תקציר Show full text abstract about Our society faces a critical challenge in shifting from a re...» Our society faces a critical challenge in shifting from a reliance on carbon-based energy to sustainable renewable sources. A key step towards achieving clean energy lies in developing efficient catalysts that can convert chemical energy into electricity or use electrons to generate chemical energy.
In our research group, we tackle these challenges by creating customized materials that draw inspiration from nature (biomimicry) and combine principles from interfacial chemistry and surface physics. For this presentation, I focus on the process of photosynthesis as inspiration for the design, characterization, and dynamic nature of functional interfaces that drive energy conversion processes such as CO2 electroreduction and water splitting.
I will also discuss the application of cutting-edge scanning probe microscopy, which allows us to visualize dynamic electrochemical processes at the nanoscale (operando imaging). Additionally, I will highlight our use of unconventional strategies that leverage chiral molecules and abundant two-dimensional materials to enhance electrocatalytic conversion processes.
(References : Nanoletters, 2021, 21, 2059; Nature Comm., 2022, 13, 3356, IJC 62, 11, 2022). -
Date:06שלישייוני 2023הרצאה
Identifying and Characterizing Biocrusts Using Spectroscopy
More information שעה 11:30 - 12:30מיקום בניין לביוכימיה על שם נלה וליאון בנוזיומרצה Dr. Offer Rozenstein
ARO Volcaniמארגן המחלקה למדעי הצמח והסביבהצרו קשר -
Date:06שלישייוני 2023הרצאה
Local and long-range inputs contributing to sequence generation in the zebra finch
More information שעה 12:30 - 13:30מיקום בניין ארתור ורושל בלפר למחקר ביורפואימרצה Prof. Michael A. Long
NYU School of Medicineמארגן המחלקה למדעי המוחצרו קשר תקציר Show full text abstract about : A central question in neuroscience is how local processing...» : A central question in neuroscience is how local processing and long-range influences work together to create behaviorally relevant neural dynamics. We address this issue by examining the song control pathway in the zebra finch. We find sufficient synaptic information is present in a key cortical structure to enable propagation of song-related sequences. We further demonstrate that long-range inputs from the motor thalamus can engage this circuitry in the service of behavior and large-scale brain synchronization. Our findings suggest that thalamic inputs may play an important initiating role for behaviorally-relevant cortical activity across species.
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Date:06שלישייוני 2023הרצאה
Microbiome Metabolites: Syntheses and Surprises
More information שעה 14:00 - 15:00מיקום אולם הרצאות ע"ש גרהרד שמידטמרצה Prof. Karl Gademann
Department of Chemistry University of Zurichמארגן המחלקה לביולוגיה מבנית וכימיתצרו קשר -
Date:06שלישייוני 2023הרצאה
Drivers and dependencies arising during tumor evolution
More information שעה 14:00 - 15:00מיקום בניין ע"ש מקס ולילאן קנדיוטימרצה Prof. Kris Wood
Department of Pharmacology and Cancer Biology, Duke Universityמארגן המכון לחקר הטיפול בסרטן עש דואקצרו קשר