סמינר מחלקתי Adi Radian

16 במרץ 2015, 15:00

וולפסון 206

School of Mechanical Engineering Seminar
Monday, March 16, 2015 at 15:00
Wolfson Building of Mechanical Engineering, Room 206

Harnessing material chemistry and microbiology to develop self-regenerating remediation solutions

Adi Radian

Department of Mechanical Engineering, University of Minnesota

Widespread pollution of water and soil are among the greatest challenges we face today. Yet, most remediation strategies offer only a partial solution; requiring follow-up steps to regenerate the system and leaving concentrated byproducts that need further processing. Developing self-regenerating materials that remove and biodegrade pollutants is therefore highly advantageous. Presented here are two examples of such materials which are composed of biodegrading bacteria encapsulated in functionalized silica gel matrices:

A phenyl-functionalized silica-gel, containing hydrophobic microspherical patches with adhered biodegrading bacteria, was developed to clean-up hydrophobic pollutants from water. The patches strongly and rapidly adsorb the pollutants and facilitate their diffusion to the adhering degrading bacteria - constantly freeing up binding sites and regenerating the material.

An Amine-functionalized silica gel was developed to protect encapsulated cells from bleach oxidation. Tricloro is a widely used water disinfectant that generates bleach and the byproduct cyanuric acid. Removal of this byproduct is crucial for safe disinfection and can be achieved with certain soil microorganisms. However, these microorganisms are susceptible to the Tricloro whose job is, after all, to kill them. We demonstrate a solution to the problem by engineering the cyanuric acid degrading enzyme to be highly bleach resistant. Furthermore, we encapsulate the bacteria in a silica gel functionalized with amine groups which act as sacrificial reactive sites creating a protective barrier. The resulting system can withstand ten times higher amounts of bleach compared to free cells in solution.

1.3.15 Seminar by Rotem Banin

01 במרץ 2015, 12:00

Kitot 001

3.1.15 Seminar by Zvi Lupo

01 במרץ 2015, 10:00

Kitot 001

You are invited to attend a lecture

Zvi Lupu

(MSc. student under the supervision of Prof. Eran Socher)

School of Electrical Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel

Column-Parallel Single-Slope ADC for Infrared Image Sensor applications

In recent years, the requirements of infrared sensors, and more specifically, uncooled IRFPAs are increasing intensively. Main requirements are frame rate, noise, dynamic range and resolution. With IRFPAs requirements going toward more integrated, more functional and more micro-system, readout circuit bandwidth needs to increase in order to keep the same frame rate for increase arrays size. For example, array of 400 X 300 (120,000 pixels) with a frame rate of 240Hz will require pixel rate of ~29MHz. for application with that readout speed, high-speed analog-to-digital converter (ADC) is require. In addition to speed, for a high performance ADC this can poses a design challenge. Due to that on-chip ADC is required. Adding the ADC in the chip will decrease system complexity and will simplify the interface.

Many sensors employ single slope column-parallel ADCs. Although single slope architecture has a disadvantage of having slow conversion rate, it has the advantages of having a very simple implementation with minimal analog content, low gain and offset errors as well as being highly linear. Compared to a global ADC, this approach required lower bandwidth in readout circuit (for each column) and can affords lower power operation.

In this work, single-slope ADC architecture was chosen and implemented. Experimental results show that the ADC is highly linear, with 11.3 bits ENOB and with SNR of 69.5dB that consume 26µW. in addition, digital summing theoretical justification was presented and shown that by averaging 4 samples, the resolution increases by 1bit but when introducing high input noise as dither to the ADC, the result of 4 sample summation is highly resemble (98%) to a 2 bit resolution increase.

Sunday, March 1, 2015, at 10:00

Room 001, Computer and Software Engineering building

EE Seminar: Recent research on microwave link rainfall estimation in the Netherlands

~~(The talk will be given in English)

Speaker: Dr. Hidde Leijnse,
Royal Netherlands Meteorological Institute, De Bilt, the Netherlands

Thursday, February 26th, 2015
11:30 - 12:30
Room 011, Kitot Bldg., Faculty of Engineering

Recent research on microwave link rainfall estimation in the Netherlands
Abstract
It is well-known that microwave links can be used to estimate rainfall. The potential of this technique is particularly great because of the global abundance of such microwave links: those that are used for communication between cellphones (see e.g. Messer et al., 2006; Leijnse et al., 2007). Recent research in the Netherlands on this subject has been focussed on improvement of our understanding of uncertainties in the rainfall estimates, and the improvement of the quality of the retrievals. For this purpose, we use a long (3-year) dataset from a microwave link network (~2000 links over 35,000 km2) on the one hand and a gauge-corrected radar dataset on the other. In addition to this, we conduct experiments with two custom-built research microwave links and a former commercial link. Analyses using these datasets will be presented, with a focus on the following aspects: 1) understanding the signal behavior in dry weather; 2) improving the wet/dry classification using geostationary satellite data; 3) quantifying uncertainties related to measurement errors and the effect of interpolation; and 4) toward new retrieval techniques.

26 בפברואר 2015, 11:30

חדר 011, בניין כיתות-חשמל

23.2.15

23 בפברואר 2015, 10:00

Wolfson 200

You are invited to attend a lecture

Matan Jackont

(MSc. student under the supervision of Prof. Yossi Rosenwaks)

School of Electrical Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel

Fabrication and Simulation of a Plasma Dispersion Modulator in Polysilicon

Silicon photonics is a fathomable development in the electronics industry. Due to the bottleneck of high data rate transmission, employing optical interconnects, in which information signals are carried by photons instead of electrons, seems only natural. The optical properties of Silicon can be used to create various devices, among which are optical modulators.

Currently, plasma dispersion is the most common method of achieving modulation in Si, in which the refractive index, both the real part, called electrorefraction, and the imaginary part, called electroabsorption, change with the concentration of free carriers in Si.

Converting a change in refractive index into intensity modulation is generally accomplished by one of two options. One common method is to change the relative phase of one arm waveguide compared to the other. This is commonly achieved by a Mach-Zender Interferometer (MZI).

In this work, the design and simulation results of a Polysilicon plasma dispersion waveguide and modulator are presented. Polysilicon large grain fabrication process was defined and electrical simulations were performed to characterize the device. The optical performance of the device was characterized using optical simulation tools, and the conditions for the viability of an MZI-based modulator in Polysilicon were established.

Monday, February 23, 2015, at 10:00

Room 200, Wolfson building

אירוע פתיחת שנה תשע"ה - חגיגות 20 שנה למועדון שילובים 07.10.14

אירוע פתיחת שנה תשע"ה - חגיגות 20 שנה למועדון שילובים

07 באוקטובר 2014, 12:55

אירוע פתיחת שנה תשע"ה - חגיגות 20 שנה למועדון שילובים

התקיים בתאריך 07.10.14 וכלל הרצאת אורח של ד"ר שלמה מרקל סגן נשיא ברודקום העולמית

פרויקט של משרד החינוך- עבור סטודנטים ובוגרים במקצועות המדעים המדויקים

דרישות התפקיד:

עבור בדיקת מבחנים במדעים ומתמטיקה וכן קידודים והקלדות

דרושים/ות סטודנטים/יות באוניברסיטאות בשנה השלישית ללימודי התואר הראשון/ או סטודנטים במהלך תואר שני/ או בוגרי תואר ראשון או שני במקצועות המדעים המדויקים (פיזיקה, כימיה, ביולוגיה, ביוטכנולוגיה), הוראת המדעים.

המועמדים יתבקשו לעבור מבחן שיבדוק את התאמתם לתפקיד

המעוניינים מתבקשים להפנות קורות חיים

*במסגרת מדיניות האוניברסיטה לעידוד גיוון תעסוקתי, ניתנת עדיפות למועמדים העונים על דרישות התפקיד ומשתייכים לאוכלוסיות אלו: חברה ערבית, חרדים, יוצאי העדה האתיופית ומועמדים עם מוגבלות. רק פניות מתאימות תענינה. في إطار سياسة الجامعة لتشجيع التنوّع التوظيفيّ، تُعطى أولويّة للمرشّحين الذين يستوفون متطلّبات الوظيفة وينتمون إلى إحدى المجموعات التالية: المجتمع العربيّ، الحريديم، أبناء الطائفة الأثيوبيّة والمرشّحين أصحاب الإعاقات.