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computer‐aided calculation of the steady‐state thermal performance characteristics of low‐voltage circuit breakers

European Transactions on Electrical Power 1993年第5期3卷 347-352页

作者： Völker, F. Dr.-Ing. Frank Völker (1958) VDI studied mechanical engineering special subjects “powerengineering automatic control engineering and mechanical science” at the University-GH-Duisburg/Germany where he got his Dipl.-Ing. degree in 1984. From 1984 to 1990 he has been a scientific assistant at the department “Konstruktionslehre und Fördertechnik” special subject “computer simulation of the performance characteristics of driving systems” at the same University where he received his Dr.-Ing. degree in 1990. In 1990 he joined Klöckner-Moeller GmbH Bonn/Germany as research engineer at the department “Forschung”. Since 1992 he is manager of Energy Management Systems at this company. (Klöckner-Moeller GmbH Head Office Energy Management Systems Hein-Moeller-Str. 7-11 D-53115 Bonn T +49228/602 - 11 62 Fax +49228/602- 11 94)

A discrete thermal network is given as an equivalent circuit of the steady‐state thermal performance characteristics of circuit breakers. The immediate environment of the enclosure and the feeders of the unenclosed switching device are the boundaries of the equivalent circuit, which specifically models the central phase of a three‐phase circuit breaker. computer simulations make it possible to analyse the thermal system performance in rated service. Selected examples prove the high quality of the model and the efficiency of the described method of calculation. Copyright © 1993 John Wiley & Sons, Ltd.

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CONCURRENT BOUNDARY-ELEMENT COMPUTATION

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1993年第2期6卷 83-98页

作者： MCDOWALL, DS LEE, TW FUSCO, VF Microwave Research Group Department of Electrical and Electronic Engineering The Queen's University of Belfast Ashby Building Stranmillis Road Belfast BT9 5AH Northern Ireland U.K. D. Stewart McDowall was born in Dublin epublic of Ireland in 1967. He received the M. Eng. degree in Electrical and Electronic Engineering from the Queen's University of Belfast in 1990. In the same year he was presented with a Distinction Award from the Department of Education of Northern Ireland and he is currently pursuing his Ph.D. in the Microwave Research Group at Q.U.B. His principal research area is the electromagnetic field mapping of microwave systems using concurrient programming. He is an Associate Member of the Institute of Electrical Engineers. Lee Thaim Wee was awarded the degree of B. Eng. in Electronics from the Queen's University of Belfast in July 1991. He is currently serving in the Malaysian Armed Forces. Vincent F. Fusco was educated at the Queen's Univeristy of Belfast where he obtained the degree of Ph.D. in 1982. He has worked as a research engineer on short-range radar and radio telementry systems. Currently he is a reader in Microwave Communications in the School of Electrical Engineering and Computer Science the Queen's Univeristy of Belfast. His current research interests include non-linear microwave circuit simulation and concurrent programming techniques for electromagnetic field problems with particular emphasis on EMC applications. He has published numerous research papers in these areas. He is the author of the bookMicrowave Circuits Analysis and Computer Aided Design Prentice-Hall 1987. Dr Fusco is a Chartered Electrical Engineer and a Member of the Institute of Electrical Engineers.

A major limitation of the boundary element method (BEM) for the solution of electrical potential problems is the long computational time required. However, a large portion of the calculations involved can be viewed as being parallel in nature and can therefore be computed concurrently. This paper makes an effort to increase the efficiency of the BEM process using transputer-based multiprocessor computing techniques. The algorithms developed may equally well be applied to any multiprocessor system. The application selected to demonstrate the technique is the solution of an electrostatic problem governed by a two-dimensional Laplace equation. A parallel algorithm for problem setup and field extraction using BEM is designed and implemented on a transputer array. Special attention is directed to the utilization of the parallel processors to achieve maximum efficiency. The analysis in this work concentrates on the communication strategies for passing data between processors as well as a consideration of the workload attributed to each processor. The parallel algorithms were implemented using 3L Parallel Fortran;however, the choice of topology for the overall BEM implementation was limited by the fact that certain parts of the algorithm could only utilize a pipeline configuration of processors. Comprehensive results for the parallel BEM algorithm are given and they are encouraging, indicating that parallel processing has much to offer when applied to the boundary element method.

关键词： Boundary element method

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Apparent power and power factor definitions for polyphase non‐linear loads when supply conductors present different resistances

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European Transactions on Electrical Power 1993年第6期3卷 415-420页

作者： Mayordomo, J.G. Usaola, J. Dr.-Ing. Julio G. Mayordomo (1956) received his Dipl.-Ing. degree and his Ph.D. degree in Electrical Engineering from E.T.S. de Ingenieros Industriales of the Polytechnical University of Madrid/Spain in 1980 and 1986 respectively. In 1980 he joined the Department of Electrical Engineering in E.T.S de Ingenieros Industriales de Madrid where he is presently Professor Titular. His Ph.D. dealt with computer simulation of the harmonic interaction in power systems. His research field comprises all questions concerning low frequency disturbances in particular harmonics and flicker. (E.T.S.I.I. Dpto. Ingeniería Elictrica. José Gutiérrez Abascal 2 E-28006 Madrid/Spain T +/341/3363 174. Fax + 341/3363008) Dr.-Ing. Julio Usaola (1961) received his Dip1.-Ing. degree and his Ph.D. degree in Electrical Engineering from E.T.S. de Ingenieros Industriales of the Polytechnical University of Madrid/Spain in 1986 and 1990 respectively. In 1988 he joined the Department of Electrical Engineering in E.T.S. de Ingenieros Industriales de Madrid where he is presently Professor Titular. His Ph.D. dealt with computer simulation of harmonic interaction in power systems. His research field comprises circuit theory and harmonic analysis in power systems. (E.T.S.I.I. Dpto. Ingeniería Eléctrica José Gutiérrez Abascal 2 E-28006 Madrid/Spain T +341/3363175 Fax +341/3363008)

A time‐domain based method of defining the apparent power is presented. It is a generalization of the De‐penbrock method to systems whose supply conductors have different resistances. The so defined apparent power can be split into orthogonal components and it is coherent with the physical meaning of the power factor. Copyright © 1993 John Wiley & Sons, Ltd.

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Guest Editorial: Focus on Digital Signal Processing Techniques Applied to Space Communications

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European Transactions on Telecommunications 1993年第1期4卷 9-10页

作者： Gaudenzi, Riccardo De Elia, Carlo Harris, Robert A. Rimrdo De Gaudend was born in Rosignano Mmo Italy in 1960. He received the Doctor En- gineer degree (cum Laude) in Electronic Engineering from the University of Pisa. Italy in 1985. From 1986 he was with the European Space Agency (ESA). Stsliow and Communications Engineering Department. Darmrtadt (RFA) where he was involved in satellite telecommunication ground systems design and testing. In particular he followed the development of two new ESA's satellite tracking systems. In 1988 be joined the ESA's Research and Technology Centre (ESTEC). Noordwijk. The Netherlands where is holding a position as releeommunication enginm in the Electrical System Department. He is presently responsible for the definition and development of advanced satellite communication systems. His mull intenst b ddyrducd with effacnt digital modulation and access techniques for fued and mobile wtdlite services synchronization topics and communication systems simulation techniques. Carlo Elia (S'89) was born in Trepuzzi. Italy in 1964. He received the Doctor Engineer degree in Electronic Engineering from Politecnico di Torino. Torino. Italy. in 1989. He his now attending a Doctorate program at PolitanieO di Torino. S i 1990. he has been with the Eurpean Space Agency (ESA) in the Electrical System Department as Tdeeommunications Syrtcm Engineer. His main areas of interest are related to rdvanccd digital modulation and access techniques and channel equalization. R.A. (Bob) Harris (S'69–M'70) received the PhD from the University of Southampton. England in 1971. In 1970 he joined the European Space Agency (then ESRO). based at the European Space Research and Technology Centre (ESTEC) Noordwijk. The Netherlandswas working on telemetry and telecommand systems. Since 1978 he has been Head of the Transmision Techniques Section in the Directorate of Telecom munications. He was involved in the transmission design of the OTS ECS Olympus and European Data Relay systems. He has worked on a wide range of analogue and digital transmission topics wit

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ELECTRON WAVE DIRECTIONAL-COUPLERS IN THE PRESENCE OF IMPURITY SCATTERING

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SUPERLATTICES AND MICROSTRUCTURES 1992年第2期12卷 185-190页

作者： QIAN, G SINGH, T CAHAY, M Device Simulation Laboratory Department of Electrical and Computer Engineering University of Cincinnati Cincinnati Ohio 45221 USA

We study the influence of impurity scattering on the probability of electron wave switching between coupled quantum wells while varying the location of the impurities in an electron-wave directional coupler. We use a transfer-matrix formalism to solve the coupled-mode equations describing the electron propagation assuming that only one symmetric and one antisymmetric states are available for conduction in the directional coupler. If the Fermi energy is not large compared to the strength of the potential energy profile, the maximum probability of electron transfer between the wells can be substantially reduced from the predicted value of 100% for perfectly symmetric impurity-free directional couplers. The probability of transfer is strongly dependent on the location of the impurities. Attractive and repulsive impurities affect the probability of transfer differently. The potential of the impurities is modeled as a delta-potential with strength equal to a few feV- cm 2 . The relevance of our simulations for the study of directional couplers proposed recently is discussed.

关键词： Semiconductor quantum wells

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WAVEPACKET SWITCHING BETWEEN COUPLED QUANTUM-WELLS

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SUPERLATTICES AND MICROSTRUCTURES 1992年第3期11卷 253-256页

作者： SINGH, T CAHAY, M Device Simulation Laboratory Department of Electrical and Computer Engineering University of Cincinnati Cincinnati OH 45221 USA

Recently several proposals of quantum interference devices have appeared based on the close proximity of two coupled electron waveguides [1,2]. The steady-state analysis of these new electron-wave directional couplers indicates that these devices are feasible using current fabrication technology [2], and could be used as basic switches in high-performance digital circuit at low enough temperature. In order to investigate the potential high-frequency applications of these newly proposed electron directional couplers, we have studied the transfer of wavepackets between parallel quantum wells using a block alternating direction implicit technique to solve the two dimensional time-dependent Schrödinger equation following the scalar ADI scheme of Douglas and Gunn [3]. While injecting a wavepacket in one well, we show that only a partial transfer between wells (close to 85%) is reached even for perfectly double-quantum wells (in the direction of growth). We also study the amount of transfer in asymmetric configurations and while varying the total energy of the wavepacket. The length and time scales for maximum transfer are found to be around a few thousand angstroms and picoseconds, respectively.

关键词： Waveguide Components

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Hierarchical Encapsulation and Abstraction Principle (HEAP) for autonomous system development 3

Hierarchical Encapsulation and Abstraction Principle (HEAP) ...

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3rd Annual Conference of AI, simulation and Planning in High Autonomy Systems

作者： Zeigler, Bernard P. Chi, Sungdo Al-Simulation Group Department of Electrical and Computer Engineering University of Arizona TucsonAZ85721 United States

A general approach to task-based model development is summarized in a Hierarchical Encapsulation and Abstraction Principle (HEAP) and this principle is briefly illustrated in the planning, operations and diagnosis tas... 详细信息

ISBN: (纸本)0818626755

关键词： Abstracting

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Hierarchical Encapsulation and Abstraction Principle (heap) for Autonomous System Development

Hierarchical Encapsulation and Abstraction Principle (heap) ...

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Annual Conference of AI, simulation, and Planning in High Autonomy Syslems

作者： B.P. Zeigler Sungdo Chi AI-Simulation Group Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA

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Governing Equation and Mathematical simulation on Ablation and Transpiration Control

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Journal of Systems engineering and Electronics 1992年第3期3卷 44-58页

作者： Yang Xueshi and Gao Wei Beijing Institute of Electromechanic System engineering, P.O. Box 3924, Beijing 100854, ChinaYuan Zhaoding Institute of computer Application and simulation Technology, Beijing 100854Xu Yanhoudepartment of Modem Mechanics, University of Science and Technology of China, Hefei 230026 Beijing Institute of Electromechanic System Engineering P.O. Box 3924 Beijing 100854 China Institute of Computer Application and Simulation Technology Beijing 100854 Department of Modern Mechanics University of Science and Technology of China Hefei 230026

This paper represents a physical model of two -dimensional transpiration cooling control system with surface heating and ablating. The governing equation is derived and the third boundary conditions are given. They constitute a two -dimensional variable -domain distributed parameter control system in which the control parameter appears in both the governing equation and the boundary conditions. Applying time semi-step alternating direction method to difference this mathematical model, the tridiagonal difference equations are obtained. For a flying shell of electromagnetic railgun, the mathematical simulation results agree with the realistic physical process, and the control parameter not only can control the temperature of heat shield, but also can control the boundary motion effectively.

关键词： Transpiration Variable-boundary Heat transfer Mathematical simulation.

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Planning for inspection based on CAD models

Planning for inspection based on CAD models

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International Conference on Pattern Recognition

作者： M. Marefat R.L. Kashyap AI-simulation group Department of Electrical and Computer Engineering University of Arizona Tucson USA School of Electrical Engineering Purdue University USA

Describes a knowledge-based inspection planning system for solid objects. The goals of intelligent inspection planning include determining which entities (edges, etc.) of the object should be measured, what camera locations and viewing directions should be used to perform inspection, and how the search for these entities and their inspection can be robustly and efficiently done once the sensor data is obtained. An effective solution to this problem is clearly very important not only from the automation point of view but also in order to gather and use sensor information effectively given the volume and complexity of required information for adequate performance.< >

关键词： Inspection computer aided manufacturing Solid modeling Shape measurement Intelligent sensors Design automation Manufacturing processes computer integrated manufacturing Cameras Position measurement

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