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Phase Angle Control in Triac-based Single-phase AC Regulators


Instructional Objectives
Study of the following:
¢ The circuit used for the phase angle control in triac-based single-

phase ac regulators (ac to ac voltage converters)
¢ The operation of the various blocks used in the circuit, along with

the waveforms
¢ The harmonic analysis of the output voltage of a single-phase ac

regulator with resistive load
Introduction
In the last lesson - second one in the first half of this ....etc

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REENA
CSE-C
14A81A05H0
....etc

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i need the matlab code for local tetra pattern...i want to refer it for my project. ....etc

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ABSTRACT
Stealth aircraft are aircraft that use stealth technology to make it harder to be detected by radar and other means than conventional aircraft by employing a combination of features to reduce visibility in the visual, audio, infrared and radio frequency (RF) spectrum. Well known examples include the United States' F-117 Nighthawk (1980s-2008), the B-2 Spirit Stealth Bomber, and the F-22 Raptor. While no aircraft is totally invisible to radar, stealth aircraft limit current conventional radar's abilities to detec ....etc

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Fingerprint Recognition :Future Directions
Presented BY:
Salil Prabhakar
Digital Persona Inc.



Fingerprint Applications

Commercial
Computer Network Logon,Electronic Data Security,E-Commerce,InternetAccess,ATM, Credit Card,Physical Access Control,Cellular PhonesPersonal Digital Assistant,Medical Records,Distance Leaning, etc.

Government

National ID card,Correctional Facilities,Driverâ„¢s License,Social Security,Welfare Disbursement,Border ....etc

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This article is presented by:
Robert J. Kauffman and Eric A. Walden

Economics and Electronic Commerce:Survey and Directions for Research

ABSTRACT
This article reviews the growing body of research on electronic commerce from the perspective of economic analysis. It begins by constructing a new framework for understanding electronic commerce research, then identifies the range of applicable theory and current research in the context of ....etc

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Directions (Q 51-60): In each of the following sentences there are two blank spaces. Below each sentence there are five pairs of words denoted by numbers 1), 2), 3), 4) and 5). Find out which pair of words can be filled up in the blanks the sentence in the same sequence to make it meaningfully complete.

51. There is complete _______ in secular India to follow the dictates of one’s conscience and _______ any way of life one chooses.
a) choice, forward b) range, avail c) freedom, pursue
d) possibility, follow e) variety, adjust

52. The ....etc

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ABSTRACT
Quantum Dots(QDs) are small conductive regions in a semiconductor, containing a number of charge carriers(from one to thousand) that occupy well defined discrete quantum states. They have typical dimensions between nanometers to a few microns .When the space at any side, around a material shrinks to 100Ã…, quantisation of the energy levels at the reduced side will occur. In quantum dots electrons are confined in all directions to a volume in space with dimensions on the order of their de Broglie wave lengt ....etc

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FM Direction Finder has wide applications like navigation of ships, aircrafts, missiles, radar, tracking satellites and other astronomical radio sources. In the field of communications, certain requirements could be to cross check the intensity, direction and positioning of transmitters employed in a cluster of a GSM network . It might be used to locate the radio sources temporarily jamming any communication network. It is also used extensively in spectrum management for checking the growth of transmitters in specific regions like radio astrono ....etc

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ABSTRACT
The term echo cancellation is used in telephony to describe the process of removing echo from a voice communication in order to improve voice quality on a telephone call. In addition to improving subjective quality, this process increases the capacity achieved through silence suppression by preventing echo from traveling across a network.



Two sources of echo have primary relevance in telephony:
acoustic echo and
hybrid echo.
Echo cancellation involves first recognizing the originally transmitted signal that re-appe ....etc

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