6/9/16

 

Control of thermal radiation by near-field effects

Dr. Nir Dahan

SCD – Semiconductor Devices Ltd., Israel

 

Abstract

In this talk, I discuss how excitation of surface waves can be utilized to modify the optical properties of materials. In particular, it is the mechanism to produce polarized and coherent thermal emission. Although the correlation length is defined by the intrinsic character of the bulk, it is enhanced by coherent coupling between resonant cavities, as in a phase antenna array. Furthermore, the interaction of surface waves with rotational symmetry structure shown to be a manifestation of geometric phase in thermal radiation. In solar applications, enhanced absorption is proposed by means of light scattering from particles close to an interface. Therein, the absorption mechanism is coupling of scattered light to surface modes. A detailed analysis is reviewed where reciprocity relation and energy conservation are satisfied on the interface. In addition, a semi-coherent model was developed to handle scattering and absorption in thin photovoltaic cells. Finally, the field of radiative energy transport in the nano-scale will be briefly presented.

 

Thursday, June 9, 2016, at 15:00

Room 011, Kitot Building

 

09 ביוני 2016, 15:00 
011 Kitot  
6/9/16

 

EE SEminar: Inference in Perturbation Models for Enhanced Matching

~~
Speaker: Chen Harel
M.Sc. student under the supervision of Prof. Daniel Cohen-Or and Prof. Shai Avidan

Wednesday, June 15th, 2016 at 15:30
Room 011, Kitot Bldg., Faculty of Engineering

Inference in Perturbation Models for Enhanced Matching

Matching meaningful correspondences is a challenging and important problem in computer vision. In particular, bipartite graph matching is a useful tool in many visual applications. In this work, we introduce the notion of perturbations for enhanced matching, and present the power of perturbation matching in the context of shape matching of image contours.
Perturbation models are high dimensional probability models that measure the stability of max-prediction to random shifts of the computed scores. The probability of a given matching is the volume of scores for which this matching is the highest scoring matching.
We demonstrate the effectiveness of our approach in pair of images with background clutter, showing that inference with perturbation models is more robust than finding the highest scoring matching. We also show that for perturbation matching it is favorable to use logistic perturbation models rather than Gumbel perturbation models, proving that inference using logistic perturbation models is more efficient.

15 ביוני 2016, 15:30 
 

Oz Oshri ביה"ס להנדסה מכאנית

06 ביוני 2016, 15:00 
וולפסון 206  
0
Oz Oshri ביה"ס להנדסה מכאנית

 

 

 

 

 

School of Mechanical Engineering Seminar
Monday, June 6, 2016 at 15:00
Wolfson Building of Mechanical Engineering, Room 206

 

 

 

 

Strain tensor selection and the elastic theory of incompatible thin sheets

 

Oz Oshri

School of Physics & Astronomy, Tel Aviv University

 

 

 

 

We re-examine the present theory of incompatible elastic sheets [Efrati et al., J. Mech. Phys. Solids {\bf 57}, 762 (2009)]. When applied to compatible sheets, deformed uniaxially by pure bending moments, it generates spurious in-plane stresses. We present an alternative formulation for a class of simple axisymmetric problems. Our theory yields linear, exactly solvable, equations of equilibrium in the case of planar deformations, replacing the non-linear ones derived earlier for these problems. In addition, we obtain a simple criterion determining whether an isometric immersion of such sheets satisfies mechanical equilibrium. When reduced to unidirectional (one-dimensional) deformations the formulation correctly converges to the extensible elastica.

bio:
BSc. Mechanical Engineering, Tel Aviv University (2004).
MSc. Mechanical Engineering, Tel Aviv University (2005), advisor: Prof. Isaac Goldhirsch.
2012-Toward a PhD in Physics, advisor: Prof. Haim Diamant. Subject: Pattern formation in thin elastic sheets.

 

 

EE Seminar: Distributed Estimation of Regression Coefficients in Bandwidth Constrained Sensor Networks

~~Speaker: Liran Gispan,
M.Sc. student under the supervision of Prof. Amir Leshem and Prof. Yair Be’ery

Wednesday, June 15, 2016 at 15:00
Room 011, Kitot Bldg., Faculty of Engineering

Distributed Estimation of Regression Coefficients in Bandwidth Constrained Sensor Networks
Abstract

Consider a wireless sensor network with a fusion center deployed to estimate a common non-random parameter vector. Each sensor obtains a noisy observation vector of the non-random parameter vector according to a linear regression model. The observation noise is correlated across the sensors. Due to power, bandwidth and complexity limitations, each sensor linearly compresses its data. The compressed data from the sensors are transmitted to the fusion center, which linearly estimates the non-random parameter vector. The goal is to design the compression matrices at the sensors and the linear unbiased estimator at the fusion center such that the total variance of the estimation error is minimized.
In this work, we provide necessary and sufficient conditions for achieving the performance of the centralized best linear unbiased estimator. We also provide the optimal compression matrices and the optimal linear unbiased estimator when these conditions are satisfied. When these conditions are not satisfied, we propose a sub-optimal algorithm to determine the compression matrices and the linear unbiased estimator. Simulation results are provided to illustrate the effectiveness of the proposed algorithm.

15 ביוני 2016, 15:00 
חדר 011, בניין כיתות-חשמל  

יום פרויקטי הגמר של הסטודנטים להנדסה ביו רפואית שנה ד' באוניברסיטת תל אביב

08 ביוני 2016, 8:00 
 
יום פרויקטי הגמר של הסטודנטים להנדסה ביו רפואית שנה ד' באוניברסיטת תל אביב

הנכם מוזמנים ליום פרויקטי הגמר של הסטודנטים

להנדסה ביו רפואית שנה ד' באוניברסיטת תל אביב - -

יום ד'  , - 08/06/2016  בפקולטה להנדסה

08:00-12:30

בחינת פרויקטים )מצגות ( חדרים 103 , 104 , 106 בניין כתות תוכנה

מוזמנים: סגל המרצים/בוחנים

 

13:00-14:45

הצגת פוסטרים)  השדרה בחזית בניין כתות חשמל(

מוזמנים: תלמידי התואר הראשון

 

15:00-17:00

כנס סוף שנה ויריד תעשיה הנדסה ביו רפואית - -

אולם רוזנבלט, בניין תוכנה

מוזמנים: כל תלמידי התואר הראשון

דברי פתיחה פרופ' מיקי שיינוביץ, ראש המחלקה להנדסה ביו -רפואית

דר' צביקה סלובין, מנכ"ל משותף, אלרון

"גישות טכנולוגיות חדשות בעולם המחלות הכרוניות והכלכלה הנגזרת מכך"

דר' מיכל בלברג, הפקולטה להנדסה, מכון טכנולוגי חולון, יזמית מייסדת חברת אורנים מדיקל

"פיתוח מיכשור רפואי מרעיון למוצר ומהנדסה לרפואה" -

  • Uri Fligil, BD Director, Neuroelectrics "From an idea to sales of a medical device"

דיון/ שולחן עגול בנושא: המהנדס הביורפואי בתעשיה הישראלית

הצגת הפרויקט המצטיין לשנת תשע"ו

 

16:00-19:00

יריד תעשיה פתוח ברחבת לובי רוזנבלט

נשמח לראותכם!

פרופ' מיקי שיינוביץ ראש המחלקה  ד"ר תמיר גבאי אחראי אקדמי,  מר אריאל גרייזס רכז הפרויקטים להנדסה ביו רפואית -

סמינר המחלקה להנדסה ביו רפואית

05 ביוני 2016, 14:00 
 

שלום רב.

הנכם מוזמנים לסמינר של המחלקה להנדסה ביו רפואית

אשר יתקיים ביום ראשון ה 05.06.16, בסמינר ירצה:

 

ד"ר פבלו בלינדר

בית ספר סגול לנוירוביולוגיה, הפקולטה למדעי החיים

אוניברסיטת תל אביב

נושא ההרצאה:

 

"Towards a multi-scale quantification of the structure and function

of the neurovascular interface"

(מצ"ב תקציר )

 

כמו כן ירצה תלמיד המחלקה לתואר השני קיריל לומקין, בנושא:
 

Genome Wide RNA Folding Structure Selection detection in Ebola Viruses via a computational modeling

( מצ"ב תקציר)

להנדסה ביו רפואית

05 ביוני 2016, 14:00 
 

 

ד"ר פבלו בלינדר

בית ספר סגול לנוירוביולוגיה, הפקולטה למדעי החיים

אוניברסיטת תל אביב

 ""Towards a multi-scale quantification of the structure and function

of the neurovascular interface"

It is estimated that the brain has about 2 seconds of internal energy to support its activity. Therefore, neurons (and other cells) relay on the continuous supply of oxygen and nutrients to active areas. This localized on-demand supply mechanism allow proper brain function and underlays the physiological source of the BOLD signal used in human functional imaging. We seek to quantify the structure and function of the neuro-glio-vascular interface with the long-term goal to decode the transform function from neuronal activity to a localized vascular output (i.e. increase in blood flow). We focus our initial effort to the system-level organization pattern between neuronal units (i.e. cortical columns) and ask whether there’s a vascular counterpart associated with them. Moreover, we extend this question to seek for general building principles along the entire lemniscal pathway where neuronal units are clearly identified also in the thalamus and trigeminal ganglia. Our current data challenges the accepted view of a stereotypic spatial organization patter and the emerging brain architectonical principle points to a lack of such organization, positioning neuronal units in a vascular continuum.

כמו כן ירצה תלמיד המחלקה לתואר שני:

קיריל לומקין

 

Genome Wide RNA Folding Structure Selection detection in Ebola Viruses via a computational modeling

Ebola is a virus with five subtypes and causes a severe, often fatal form of hemorrhagic fever disease in human and/or nonhuman primates; currently there is no approved vaccine or medicine is available for Ebola.

 It is known that various secondary structures conformation of the viral RNA involve in the regulation of different steps in the viral life cycle, including gene expression and replication, and have important effect on the viral fitness.

 In this work, we performed for the first time a large scale computational analysis to detect regions in the viral genetic material that undergo selection for ‘silent’ features such as weak/strong local RNA folding strength in 988 Ebola virus genomes, from five subtypes.

By devising relevant null models, among others, we were able to detect dozens of novel positions (~2.8% of the genome) that are suspected to undergo such a selection. We demonstrate that many of these positions are conserved among different subtypes (e.g. 13% of the detected positions are shared by at least two subtypes).

The new discoveries promote the development of novel future anti-viral therapeutic approaches and vaccines.

עמודים

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אוניברסיטת תל-אביב, ת.ד. 39040, תל-אביב 6997801