Lecture 4 Density of States and Fermi Energy Concepts Reading: (Cont’d) Notes and Anderson2 sections 2.8-2.13 Georgia Tech ECE 3080 - Dr. Alan Doolittle How do electrons and holes populate the bands? Density of States Concept In lower level courses‚ we state that “Quantum Mechanics” tells us that the number of available states in a cubic cm per unit of energy‚ the density of states‚ is given by: * * mn 2mn ( E Ec ) gc (E) ‚ E Ec 2 3 gv (E) m * 2 m * ( Ev E )
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A COMPARISON OF ALUMINUM VS. COPPER AS USED IN ELECTRICAL EQUIPMENT Larry Pryor‚ P.E. – Sr. Specification Engineer‚ GE Consumer & Industrial Rick Schlobohm‚ P.E. – Sr. Specification Engineer‚ GE Consumer & Industrial Bill Brownell‚ P.E – Specification Engineer‚ GE Consumer & Industrial ABSTRACT The debate over the pros and cons of aluminum vs. copper conductors has been discussed for many years. Many of the concerns are based on old information and also misinformation. These concerns center on the
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Formal paper number 1 Professor Tolentino Maria Oyervide EXPERIMENT #4 IONIC AND COVALENT COMPOUNDS Abstract: This experiment was divided in four steps to find the electrical conductivity of covalent and ionic solutions. There were four unknown solutes A‚ B and C. Each had a specific weight and was dissolved in a certain amount of solute to form either the covalent or ionic solution. Covalent compounds are made up of molecules which are electrically neutral. Ionic compounds are composed
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General Electrical Medical Systems Prepared by Mohamed Tarek Esmat Student ID 091076 Q1: What is the underlying logic behind the global product company idea? Global Product Company (GPC) philosophy is mainly aiming at producing products that fit global markets with lowest cost and highest profit. This philosophy has mechanisms that have been applied to different phases of product lifecycle: Manufacturing phase: In manufacturing phase‚ cutting costs was achieved by moving manufacturing
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Chapmans Electrical is a business in West Midlands that has been around for 90 years; Chapman Electrical serves their customers electrical goods; Chapmans Electrical offer their customers a service (such as a Television Repair)‚ products (like Home Appliances) and an installation service (such as Wi-Fi Home & Networking). Also‚ Chapmans Electrical sells their service‚ products and installation serve to their customers to the public; anyone can take part on what Chapmans Electrical has to offer for
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IEEE Standard for Electrical Power System Device Function Numbers‚ Acronyms‚ and Contact Designations TM IEEE Power and Energy Society Sponsored by the Substations Committee and the Power Systems Relaying Committee C37.2 IEEE 3 Park Avenue New York‚ NY 10016-5997‚ USA 3 October 2008 IEEE Std C37.2™-2008 (Revision of IEEE Std C37.2-1996) Copyright The Institute of Electrical and Electronics Engineers‚ Inc. Provided by IHS under license with IEEE No reproduction or networking permitted
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the fact that there are many companies that are affected of the global economic crisis. And the least thing that you can do about unemployment is to find a best way on generating money like you can accept laundry services‚ plumbing services‚ or electrical repair services if you are skilled enough to do the job. Then‚ you could start a certain profitable business like food house or a small store that does not require you much capital so that you will not find it hard to save enough money from the
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3Analysis PAGEREF _Toc401637014 \h 4Westover Electrical Winding Operation Flow Chart PAGEREF _Toc401637015 \h 4Causes of Winding Effects: Fishbone Diagram PAGEREF _Toc401637016 \h 5Statistical Process Control Chart: Rejects through Time PAGEREF _Toc401637017 \h 5Paretto Chart PAGEREF _Toc401637018 \h 6Recommendations PAGEREF _Toc401637019 \h 7Best Solution PAGEREF _Toc401637020 \h 8Conclusion PAGEREF _Toc401637021 \h 9 Executive SummaryWestover Electrical‚ Inc.‚ is a medium-size Houston manufacturer
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The use of electrical stimulation has been used widely in physical therapy for many different reasons to treat and manage pain‚ joint limitations‚ spasticity and spasms‚ muscle disuse atrophy‚ circulatory deficits and muscle re-education. The purpose of this case report is to describe the efficacy of using a medium frequency alternating current (MFAC)‚ a Russian stimulation‚ for muscle re-education and strengthening to the quadriceps femoris muscles to help improve the ability to perform sit to stand
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end of the case Zwick Electrical “Did the consultants come up with anything?” asked Wilton Zwick. His brother‚ Carlton‚ nodded affirmatively. “There are several possible alternatives. In terms of alliances it looks like they have identified two potential partners. Here‚ take a look for yourself.” Wilton quickly scanned the report’s front page. “Hmm‚ Asea Brown Boveri and Siemens?” Carlton and Wilton Zwick are‚ respectively‚ president and vice president of Zwick Electrical Incorporated (ZEI)‚ a
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