הפקולטה להנדסה ע"ש איבי ואלדר פליישמן

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Shurik Yatom

22 בנובמבר 2018, 15:00

פקולטה להנדסה, ביניין כיתות, חדר 011

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Shurik Yatom

שוריק יתום סמינר

You are invited to attend a lecture

(Selected) Frontiers in plasma science

:By

Shurik Yatom

Princeton University, Princeton Plasma Physics Laboratory

Abstract

Plasma is a partially of fully ionized gas, comprising the 99 % of the visible matter in the universe. The physical plasma is scarce in nature on Earth, however is continuingly gains popularity in the science and technology fields, since being described by Langmuir in 1920s. Currently, multiple directions of plasma related research are prominent in a variety of scientific and technological fields: from the quest for fusion energy, through plasma propulsion for space-travel, to plasma medicine, agriculture and material fabrication and functionalization. The potential for applications is indeed vast, however so are the scientific challenges that emerge in the context of the above applications. In this talk I will concentrate on two exciting areas: plasma-assisted synthesis of nanomaterials and the plasma interactions with liquids, biological tissues and cells. Both of these research areas are incredibly complex, owing to multiple different interacting species with a wide variety of energies, sizes and chemical potentials, interacting across all the possible phases of matter, from gas to liquid, solid and crystal phases, presenting many exciting physical challenges. Notably, both these areas consider multiphase environment, posing many scientific challenges, such as: large density and temperature, unknown plasma characteristics, the control of the reactivity transfer at the plasma–liquid/solid interface, interfacial charging, droplet transport and self-organization of plasmas in contact with liquid/solid. Similar challenges occur in the interface of plasma with biological tissues and cells. The phenomenon of plasma self-organization into coherent structures and patterns is particularly interesting, because it modulates the characteristics of the plasma, influencing the density and the energy of the charged particles, chemical composition, species transport along and across the plasma-tissue/liquid interface, radiation and electric fields. The aim of this seminar is to introduce these selected frontiers of plasma science, discuss their promise, challenges and the experimental approach to their investigation.

On Thursday, Nov 22, 2018, 15:00

Room 011, Kitot building

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Boris Vaisband

20 בנובמבר 2018, 15:00

פקולטה להנדסה, ביניין כיתות, חדר 011

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Boris Vaisband

בוריס וייסבנד סמינר

You are invited to attend a lecture

Framework for Heterogeneous Systems Integration

:By

Boris Vaisband

Center for Heterogeneous Integration and Performance Scaling (CHIPS)

Department of Electrical Engineering, University of California, Los Angeles, CA

Abstract

Integration of heterogeneous technologies and functionalities (i.e., materials, devices, and circuits) within a single platform is imperative to support modern performance requirements. Various platforms have been developed for heterogeneous integration, including interposers, 3-D integrated circuits, wafer-scale integration, flexible and bio-compatible technologies, and others. Enablement of these platforms however, requires solutions on a broad span of hierarchy, from technological innovation in materials and devices, through efficient circuit design, up to novel system-level architectures and methodologies. Research across the aforementioned hierarchy will be presented in this talk for two heterogeneous integration platforms: 3-D integrated circuits and silicon interconnect fabric. Suitable applications for each of these platforms will also be discussed. Some of the obtained results exhibit significant performance improvement over classical approaches in terms of area and power; other presented work outlines a path for enablement of a paradigm shift in heterogeneous integration

On Tuesday, Nov 20, 2018, 15:00

Room 011, Kitot building

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Liron Stern

18 בנובמבר 2018, 13:00

פקולטה להנדסה, ביניין כיתות, חדר 011

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Liron Stern

סמינר לירון שטרן

You are invited to attend a lecture

Chip-scale metrology: taming atoms, frequency combs and cavities

:By

Liron Stern

National Institute of Standards and Technology (NIST), Time & Frequency division, 325 Broadway Boulder CO, USA

Metrology, the science of measurement, strives to push the limits of human ability to measure quantities such as time, frequency, distance, temperature and mass. This ongoing global effort provides us with a reference “ruler” which is crucial both for understanding the fundamental nature of our universe, as well as an enabling and driving new technologies. Central to such measurements are quantum sensors, such as atomic clocks, magnetometers and superconducting voltage standards which are continuously driving today’s technological revolutions. Nowadays, we are witnessing a universal endeavor to miniaturize such “measuring machines” with two prime motivations: understanding the fundamentals of light-matter interactions at these extreme limits, and enabling new applications in disciplines such as telecommunication, space exploration and medical devices.

In this talk, I will present how we move forward to enable chip-scale frequency metrology. First, I will introduce the recently discovered microresonator based Kerr-soliton frequency combs, and experiments and calculations where we have used these as a spectroscopic tool to directly interact with atomic vapour. I will present experimental results where we construct a new type of micro-machined atomic vapour cells where diffractive optics are merged with atomic physics. I will describe how these devices map atomic states to the spatial distribution of diffracted light, and how we can utilize these effects to allow offset frequency locks with high stability. Finally, I will present a miniaturized cavity with a quality factor of a billion, interfaced with an atomic micromachined atomic cell, providing ~100 Hz of linewidth and stable optical frequency. To conclude, I will show how interfacing atoms, Kerr-combs, and miniaturized cavities paves the way to a fully chip-scale metrology system, and discuss the huge impact such system may cast on science and technology.

On Sunday, November 18, 2018, 13:00

Room 011, Kitot building

פעילות מדעית לילדי ארגון בוגרי הנדסה 04.12.18

04 בדצמבר 2018, 9:00

חדר 206 בניין וולפסון בפקולטה להנדסה

פעילות מדעית לילדי ארגון בוגרי הנדסה 04.12.18

פעילות מדעית לילדי ארגון בוגרי הנדסה

הסיור מתאים לילדי כיתות ג-ו

יום שלישי 04.12.18

בין השעות 09:00-13:00

מספר המקומות מוגבל

הסיור הינו בתשלום בסך 25 ש"ח לכל ילד

לפרטים והרשמה לחצו כאן

סיור במעבדות של אימפקט לאבס 17.12.18

17 בדצמבר 2018, 18:45

מעבדות אימפקסטלאבס בתל אביב

סיור במעבדות של אימפקט לאבס 17.12.18

סיור במעבדות של אימפקט לאבס

Impact Labs

מעבדת המייקרים הגדולה בישראל, פועלת בשיתוף פעולה עם WeWork

מאפשרת לחבריה בחלל של 1000 מ"ר, גישה ותמיכה לטכנולוגייתhigh end

ניפגש ביום שני 17.12.18

18:45-19:15 התכנסות, מינגלינג ובו זמנית יועברו סיורים במקום

בהמשך הערב הכרות והסבר על IMPACTLABS והרצאה בנושא

פיתוח אבות טיפוס (Prototypes)

זמן משוער לסיום 20:45

לפרטים והרשמה לחצו כאן

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Itay Shomroni

15 בנובמבר 2018, 15:00

פקולטה להנדסה, ביניין כיתות, חדר 011

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Itay Shomroni

You are invited to attend a lecture

Quantum control with nanomechanical oscillators

:By

Itay Shomroni

Laboratoire de Photonique et de Mesure Quantique

Abstract

Quantum optomechanics, the study of mechanical motion in the quantum regime

using light, is an emerging field with applications ranging from sensing to

quantum information to exploring the classical-to-quantum transition. Although

its foundations had been laid in the 60s and 70s, quantum effects in macroscopic

mechanical motion, such as motional sideband asymmetry, radiation pressure shot

noise, and ponderomotive squeezing, have been observed only in the recent decade,

with advances in high-finesse microcavities. Mechanical oscillators based on

photonic crystals are one of the most promising systems for probing and

manipulating quantum motion, allowing efficient cooling to the motional ground

state using light as well as quantum-coherent operations. I will describe my

recent research with these systems, which includes the first demonstration of

backaction-evading measurement of mechanical motion in the optical domain. Such

measurement, originally proposed in the context of gravitational wave detection,

allows in principle arbitrary sensitivity by measuring only a single quadrature

of the motion, beating the quantum limit imposed by Heisenberg's uncertainty

relation. In addition, entering the regime of strongly-probed mechanical systems

close to their ground state has revealed novel phenomena such as interplay of

optomechanics and other Kerr-type effects, and new dynamics that can lead to

extraordinary instabilities. Quantum optomechanics is now entering a new era where full quantum control is feasible, and I will give my outlook and possible future

directions.

On Thursday, Nov 15, 2018, 15:00

Room 011, Kitot building

EE Seminar: An Efficient Simulation Tool For the Auditory System By Parallel Processing

05 בדצמבר 2018, 15:30

חדר 011, בניין כיתות-חשמל

Speaker: Yonatn Koral

M.Sc. student under the supervision of Prof. Miriam Furst-Yust and Prof. Shlomo Weiss

Wednesday, December 5^th, 2018 at 15:30

Room 011, Kitot Bldg., Faculty of Engineering

An Efficient Simulation Tool For the Auditory System By Parallel Processing

Abstract

This work presents an auditory-emulation program that simulates the auditory neural response and determines hearing level based on a parallel time-domain nonlinear solution of the cochlea. Previous such simulations used a parallel calculation of the basilar membrane velocity and then calculated the serial neural response in the temporal and longitudinal dimensions. However, this approach suffers from limited efficiency because it requires copying large arrays and performing serial computation. In contrast, the proposed approach uses the graphics processing unit to do massively parallel computing, which accelerates threshold derivation based on the neural response calculation by a factor of 80 to 400. This is valuable both to calculate the hearing level for single-pitch signals and spoken words (with various types of noise or in silence) and to determine the benefit of different hearing aids to the hearing impaired.

EE Seminar: New Paradigms for Cryptographic Hashing

19 בנובמבר 2018, 15:00

חדר 011, בניין כיתות-חשמל

(The talk will be given in English)

Speaker: Dr. Ilan Komargodski
Cornell Tech.

Monday, November 19^th, 2018
15:00 - 16:00

Room 011, Kitot Bldg., Faculty of Engineering

New Paradigms for Cryptographic Hashing

Abstract

Cryptographic hash functions are the basis of many important and far reaching results in cryptography, complexity theory, and beyond. In particular, hash functions are the primary building block of fundamental applications like digital signatures and verifiable computation, and they are the tool underlying the proofs-of-work which drive blockchains.

Because of the central role of cryptographic hash functions in both theory and practice, it is crucial to understand their security guarantees, toward basing applications on the minimal possible notion of security. Indeed, there are many ways to formalize the security requirement of a hash function; each way is sufficient for different applications. Also, there are many candidate hash functions, offering various trade-offs between security, efficiency, and other desirable properties.

In this talk, I will present an application [Komargodski-Naor-Yogev, FOCS 2017] of a relatively weak notion of hashing (collision resistance) that goes well beyond cryptography into a fundamental problem in the intersection of complexity theory and combinatorics -- the Ramsey problem. This will lead us to new emerging aspects of hash functions, including relaxed security notions and their applications, addressing a recent attack on SHA-1. I will conclude with several exciting open problems and challenges.

Short Bio

Ilan Komargodski is a postdoctoral researcher at the cryptography and security group at Cornell Tech, hosted by Prof. Rafael Pass. His research interests are in cryptography and its interplay with other fields in the foundations of computer science. He earned his Ph.D. in computer science from the Weizmann Institute of Science in 2017, where he was advised by Prof. Moni Naor.

EE Seminar: STRING DAMPING: AN EXAMPLE IN ASYMPTOTIC CONTROL THEORY

18 בנובמבר 2018, 15:00

חדר 011, בניין כיתות-חשמל

(The talk will be given in English)

Speakers: ALEXANDER OVSEEVICH AND ALEKSEY FEDOROV

Russian Academy of Sciences for Machine Learning at ETH Zurich

SUNDAY, November 18^th, 2018
15:00 - 16:00

Room 011, Kitot Bldg., Faculty of Engineering

STRING DAMPING: AN EXAMPLE IN ASYMPTOTIC CONTROL THEORY

Abstract

We study the problem of the minimum-time damping of a closed string under a bounded load, applied at a single _xed point. A constructive feedback control law is designed, which allows to bring the system to a bounded neighbourhood of the terminal manifold. The law has the form of the dry friction at the point, where the load is applied. The motion under the control is governed by a nonlinear wave equation. The existence and uniqueness of solution of the Cauchy problem for this equation are proved. The main result is the asymptotic optimality of the suggested control law.

Keywords maximum principle, reachable sets, linear system MSC 2010: 93B03, 93B07, 93B52.

Bio
AO born in Moscow, Russia in 1951, graduated From the mathematical department of the Moscow State University in 1973, and in 1976 defended PhD dissertation on number theory in the Mathematical Institute of the academy of sciences.

He obtained the next degree (Dr. of phys.-math. sc.) in 1997 from the Institute for Problems in mechanics, RAS for work in control theory. Worked in many areas of mathematics, from number theory to mathematical physics.

At present affiliated with the Institute for Problems in mechanics, RAS. Institute for Problems in Mechanics, Russian Academy of Sciences, 119526, Vernadsky av., 101/1, Moscow, Russia, ovseev@ipmnet.ru Russian Quantum Center, aleksey.fedorov@lptms.u-psud.fr

School of Mechanical Engineering Tamar Domb

15 במאי 2019, 14:00 - 15:00

בניין וולפסון חדר 206

School of Mechanical Engineering Tamar Domb

School of Mechanical Engineering Seminar
Wednesday, May 15, 2019 at 14:00
Wolfson Building of Mechanical Engineering, Room 206

Active and Passive Flow Control Methods Applied on a Quarter Truck Model

Tamar Domb

M.Sc. student of Prof. Avi Seifert

The need to reduce the fuel consumption of road vehicles, in particular of heavy ones, is an important scientific and technological challenge, due to its economic, environmental and political impact. Driving at highway speeds is a highly wasteful process, because the aerodynamic drag (airflow resistance) is increasing in a cubic fashion with the driving speed.

The present research deals with advanced methods to reduce the fuel consumption of heavy vehicles driving at highway permitted speeds. The research went beyond the currently available methods, that are passive (e.g., shaping) that modify the shape of the trailer end. Our methods are termed “active” in the sense that they use a system of devices that consume energy, but can be operated only when needed and in a controlled method that can be adjusted to the changing driving conditions and more importantly, be significantly smaller than current devices while being at least as effective.

The main goal of the research was to study the effects of the shape of a drag reducing device, that is mounted at the rear-end of a truck-trailer configuration, and mapping the stream-wise vortices that develop at the corners of the drag reducing device.

The model used in this research is a quarter model of a 1:6 scale of a real truck, mounted to two of the wind tunnels walls. The experiments included a few main configurations, and the baseline configuration. Passive flow control methods were added in the form of add-on devices mounted to the model's back wall. One add-on device was also used with two methods of active flow control: Flow suction and a combination of flow suction with oscillatory blowing.

The wind tunnel test results showed drag reduction using the add-ons, which in some cases was increased thanks to the active flow control methods used. The most effective combination was detected and a net gain calculation was made.

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