סטודנטיות וסטודנטים יקרים,

יש לכם.ן ראיון עבודה ואין לכם.ן מושג איך להתחיל להתכונן אליו? פתחתם.ן חשבון לינקדאין אבל אתם.ן לא יודעים.ות איך להמשיך מכאן?

צוות הגיוס של חברת NVIDIA מגיע לפגוש אתכם.ן כאן בקמפוס, וכל מה שאתם.ן צריכים.ות לעשות זה להירשם ולהגיע.

נתחיל מסדנה בנושא הכנה לראיונות עבודה, ונעבור לסדנת לינקדאין.

בסוף נשאיר גם זמן לשאלות עם המגייסות על כל דבר שהייתם.ן רוצים.ות לדעת.

מתי? 

יום רביעי 07.12.22 בשעה 10:00 

איפה?

כיתה 011 בניין כיתות

להרשמה לחץ כאן

מוזמנים.ת להמשיך להתעדכן בכל עת בדף הפייסבוק שלנו.

School of Mechanical Engineering Seminar

Wednesday, December 7, 2022 at 14:00
ZOOM SEMINAR

Liquid crystal elastomers as unconventional actuators and strain sensors

Jan Lagerwall

Experimental Soft Matter Physics group, Department of Physics & Materials Science University of Luxembourg

www.lcsoftmatter.com

A lively development in today’s materials science research is the creation of new ’smart’ materials that respond to specific stimuli by changing their appearance or shape. Importantly, this adaptive nature is inherent to the material, rather than arising from the interaction of multiple components. This allows single elements in a garment, a construction or any other artifact to be their own actuator or sensor, while at the same time filling the basic passive function that they were designed for. Liquid Crystal Elastomers (LCEs) constitute an exciting example of smart and adaptive materials. They can be designed to change their color in response to mechanical strain [1,2] (top figure) or, conversely, to change their shape—fully reversibly— in response to heat [3] (bottom figure), light, humidity or electric fields. Because the order that gives rise to their remarkable behavior develops by self-assembly in a liquid precursor, they can be made quickly and at low cost, in arbitrary shape, and the rubbery nature of their final state makes them easy to handle and integrate in a variety of structures.

The adaptive nature and versatile and easy processing of LCEs give them tremendous application potential across a variety of fields, from sun-powered kinetic building facades that autonomously adapt to daily and seasonal variations in temperature and humidity [4], saving energy and creating a better indoor climate for the building occupants, to garments that reveal the pressure they apply on the body as a function of location or illustrate the strains involved during motion [2]. In my talk, I will give a brief introduction to what LCEs are, how they work, and how they might be applied in the future, based on recent results from our group [1–3] and interdisciplinary collaborations [4].

[1] Rijeesh Kizhakidathazhath et al. Facile Anisotropic Deswelling Method for Realizing Large‐Area Cholesteric Liquid Crystal Elastomers with Uniform Structural Color and Broad‐Range Mechanochromic Response. Adv. Funct. Mater. 30, 1909537 (2020).

[2] Y. Geng, R. Kizhakidathazhath. & J. P. F. Lagerwall, Robust cholesteric liquid crystal elastomer fibres for mechanochromic textiles. Nat. Mater. (2022). DOI: 10.1038/s41563-022-01355-6.

[3] A. Sharma,  A.M. Stoffel, & J.P.F. Lagerwall. Liquid crystal elastomer shells with topological defect-defined actuation: Complex shape morphing, opening/closing, and unidirectional rotation. J. Appl. Phys. 129, 174701 (2021).

[4] M. Schwartz & J.P.F. Lagerwall, Embedding intelligence in materials for responsive built environment: A topical review on Liquid Crystal Elastomer actuators and sensors. Building and Environment 226, 109714 (2022).

Jan Lagerwall (M.Sc. Physics 1997; Ph.D. Materials Science, 2002) is professor in physics at University of Luxembourg. His research focuses on soft matter physics, chemistry and materials science, connecting liquid crystals with many other fields, from fiber spinning and microfluidics to art, architecture, robotics and security. The motivation ranges from the scientific beauty to the diverse application opportunities arising through cross fertilization with other disciplines. He is a threefold ERC grant recipient (one CoG and two PoC grants). As postdoctoral researcher Jan worked with N.A. Clark (Boulder), G. Heppke (Berlin) and F. Giesselmann (Stuttgart). He previously held group leader positions at Martin Luther University Halle-Wittenberg (Germany) and Seoul National University (Korea). He is actively working to bring the fruits of his group’s academic research to use for society and industry through a multitude of collaborations and the foundation of spin-off companies.

This study shed light on the effects of pump configuration on the performance and risk of blood damage, indicating the roles of the hub shape and angular velocity as dominant parameter. These findings can be utilized to improve future designs of p-LVAD.

Join Zoom Meetinghttps://tau-ac-il.zoom.us/j/4962025174?pwd=bVJUeElXRUUya3BERisyNllLOE9EZz09

(The talk will be given in English)

Speaker:  Dr. Anatoly Khina

School of Electrical Engineering, Tel Aviv University

 011 hall, Electrical Engineering-Kitot Building 

Monday, November 28^th, 2022

15:00 - 16:00

The Information Velocity of Packet-Erasure Links

Abstract

What is the maximal speed—the information velocity—at which information can propagate reliably in a network through a cascade of links? 

Information theory tells us what is the maximal rate of reliable communications through a small number of such links when delay is not important. However, if we want to communicate in real time, answering this question becomes much more challenging. In fact, even for the simple case of transmitting a single bit over a tandem of links, where each flips its input independently (across time & links), an answer was given only very recently.

In this talk, I will present some recent results for this problem for packet-based links with ACK signals. In particular, I will derive the information velocity for a causally arriving stream of packets, and determine the arrive-failure exponential decay rate below the information velocity.

No prior knowledge of information theory or queueing theory will be assumed.

Joint work with Elad Domanovitz & Tal Philosof.

Short Bio

Anatoly Khina is a faculty member in the School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel, from which he holds B.Sc. (summa cum laude, 2006), M.Sc. (summa cum laude, 2010), and Ph.D. (2016) degrees, all in Electrical Engineering. Parallel to his studies, he worked as an engineer in various roles focused on algorithms, software and hardware R&D. He was a Postdoctoral Scholar in the Department of Electrical Engineering, California Institute of Technology, Pasadena, CA, USA, from 2015 to 2018, and a Research Fellow at the Simons Institute for the Theory of Computing, University of California, Berkeley, Berkeley, CA, USA, during the spring of 2018. His research interests include information theory, communications, statistics, control theory, and signal processing.

He is a recipient of the Fulbright, Rothschild and Marie Skłodowska-Curie Postdoctoral Fellowships; Clore Scholarship; Trotsky Award; Weinstein Prize in signal processing; Intel award for Ph.D. research; and the first prize for outstanding research work in the field of communication technologies from the Advanced Communication Center's Feder Family Award program.

השתתפות בסמינר תיתן קרדיט שמיעה = עפ"י רישום שם מלא + מספר ת.ז. בטופס הנוכחות שיועבר באולם במהלך הסמינר

School of Mechanical Engineering Seminar

Monday, December 5, 2022 at 14:00
Wolfson Building of Mechanical Engineering, Room 206

Active polymerized membranes: nonequilibrium self-assembly and self-organized dynamics

Dr. Itamar Kolvin

Physics Department, UC Santa Barbara

Engineering flows and deformation is typically a top-down approach: think of a fluid pumped through a pipe, or a concrete pillar supporting a structure. Biology, however, often takes a bottom-up approach to mechanics. Microscopic actin filaments self-assemble into contracting sarcomere units and then into the myofibrils and muscle fibers that make up our skeletal muscles. In this talk, I will introduce the field of active matter: fluids and solids that are driven by mechanically active microscopic units. I will show how extensile active flows drive the assembly of polymerized membranes in an aqueous environment. Initially, homogeneously and isotropically distributed actin bundles condense into a thin two-dimensional layer where they connect to form an elastic network of tens-of-microns pore size. Membranes then exhibit out-of-plane bending fluctuations that exceed thermal motions by orders of magnitude. Active bending endows the fluctuating membranes with in-plane deformation soft modes that coarsen into large, millimeter-scale, strain fluctuations. For membranes that are a few millimeters in width, system-size displacement oscillations appear that are coupled to unidirectional flow waves. Active matter is thus an emerging paradigm for the mechanical control of assembly and dynamics in materials. I will discuss future extensions of this principle.

Short Bio:

Dr. Itamar Kolvin received his Ph.D. from the Hebrew University of Jerusalem for studying dynamic fracture fronts in brittle hydrogels. In 2017, he became a Human Frontier Science Program fellow at UC Santa Barbara, where he pursues postdoctoral research in active and adaptive soft materials. Dr. Kolvin is broadly interested in the non-equilibrium mechanics of fluids and solids at the nexus of hydrodynamics, elasticity, and soft matter.

Join Zoom Meeting

https://tau-ac-il.zoom.us/j/4962025174?pwd=bVJUeElXRUUya3BERisyNllLOE9EZz09