motors. Consequently‚ DC drives are widely used for variable speed operation‚ whereas AC machines were used mainly for fixed speed applications. After power semiconductor devices were introduced in 1950s Although self turnoff devices (Bipolar Junction Transistor – BJT) were available in the 1950s their voltage ratings were too low which make them inappropriate to be used in power circuit. Silicon-Controlled Rectifier (SCR) was introduced
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single Si nanowires‚ by means of microphotocurrent spectroscopy combined with transport measurements of carrier diffusion length using the electron beam induced current technique. The study is performed on different diameter nanowires with Schottky junctions created by doping modulation during Chemical Vapor Deposition–Vapor Liquid Solid growth. We show that the photocurrent spectra of single Si nanowires do not follow monotonous profiles as bulk silicon‚ but rather have steep valleys and peaks whose
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Solar Tracker Bill Lane* Department of Electrical and Computer Engineering Cleveland State University Cleveland‚ Ohio 44115 EEC 517 April 30‚ 2008 * welane3@hotmail.com or wlane@republicengineered.com Abstract Solar energy is rapidly gaining notoriety as an important means of expanding renewable energy resources. As such‚ it is vital that those in engineering fields understand the technologies associated with this area. My project will include the design and construction of a microcontroller-based
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or sutures (Hazarika & Nayak‚ 2005). Methods by using monopolar or bipolar diathermy where the tonsils are dissected using the diathermy. Tonsillectomy can also be done by using the laser and finally the most commonly used now in most hospital is the coblation method. Coblation is a radio-frequency dissection method that cuts the tissue by breaking down the inter-cellular bonds and seals the wound at the same time. It is a bipolar system working through a medium of normal saline that is incorporated
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i De La Salle Lipa College of Information Technology and Engineering Electronics Engineering Department PC – Based Lighting and Fan System Gesmundo‚ Kaycee Kimberly S. Marquez‚ Mark Aries J. Mea‚ Kit Arvin C. Perez‚ Omar Mikhail I. Tirones‚ Jefferson A. Umali‚ Max Oliver M. T4A March 2012 Engr. Robert G. De Luna Instructor i Table of Contents page I. Introduction 1 II. Physical Description 2 III. System Operation 3 IV. System Specification
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The electrical activity of the heart: the electrocardiogram Electrical activity is a basic characteristic of the heart and is the stimulus for cardiac contraction. Disturbances of electrical function are common in heart disease. Their registration as an electrocardiogram (ECG) plays an essential role in the diagnosis and management of heart disorders. THE GENESIS OF THE ELECTROCARDIOGRAM Pathways of conduction and the electrocardiogram The sinus node is situated in the right atrium
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1 Smoke Detector ∗ Sardar Nimisha Sankhe∗ ‚ Nisarg Vinod† and Ekta Vira Patel Institute of Technology‚ Mumbai-400058‚ India‚ nimisha.sankhe@yahoo.com † Sardar Patel Institute of Technology‚ Mumbai-400058‚ India‚ naughty.nisarg@yahoo.co.in ‡ Sardar Patel Institute of Technology‚ Mumbai-400058‚ India‚ ekta vira@ymail.com Abstract Most of the smoke alarms available in the market use one or another kind of smoke sensor which increases the cost and also require complicated interfacing circuitry
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PSC 101 EXAM 2 Study Guide Part 1- Sensory Systems 1. Sound can best be thought of as a) compression of air molecules by an object. b) changes in air pressure produced by the vibration of an object. c) particles of energy that travel at better than 20 miles per hour. d) packets of energy. e) expansion of air molecules produced by an object as it moves through air. 2. The loudness of a sound is related to a) the amplitude of sound vibration. b) the distance between the successive
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ENGINEERING MATHEMATICS – I Sub Code Hrs/ Week Total Hrs. : : : 10MAT11 04 52 IA Marks Exam Hours Exam Marks : : : 25 03 100 PART-A UNIT – 1 Differential Calculus - 1 Determination of nth derivative of standard functions-illustrative examples*. Leibnitz’s theorem (without proof) and problems. Rolle’s Theorem – Geometrical interpretation. Lagrange’s and Cauchy’s mean value theorems. Taylor’s and Maclaurin’s series expansions of function of one variable (without proof). 6 Hours UNIT – 2 Differential
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BIO 210 Anatomy & Physiology I Study Guide for Cumulative Final Exam 1. Know the Student Learning Objectives given on the course syllabus. 2. Be able to define: anatomy chemistry positive feedback anabolism physiology biochemistry negative feedback catabolism histology homeostasis metabolism 3. Be able to identify specific examples of homeostasis and negative feedback regulation with blood glucose and calcium levels and blood pressure control. 4. Be able to place each level
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