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Arrays. A software package for analysis of antenna arrays

computer Applications in engineering Education 1992年第1期1卷 109-109页

作者： Elsherbeni, A.Z. Ginn, P.H. Electrical Engineering Department University of Mississippi University Mississippi 38677 Dr. Atef Z. Elsherbeni:received an honorary BSc in Electronics and Communications an honorary BSc in Applied Physics and an MEng in Electrical Engineering all from Cairo University Cairo Egypt in 1976 1979 and 1982 respectively. He also received a PhD in Electrical Engineering from Manitoba University Winnipeg Manitoba Canada in 1987. He was a research assistant with the faculty of Engineering at Cairo University from 1976 to 1982 and at the Electrical Engineering Department Manitoba University from 1983 to 1986 and a Postdoctoral fellow in the same department from January to August 1987. He joined the faculty at the University of Mississippi in August 1987 where he is currently an Associate Professor of Electrical Engineering. During the last few years he was involved in developing software for undergraduate education related to electromagnetic waves and antenna design courses. His professional interests include microstrip antennas scattering and diffraction of electromagnetic waves numerical techniques and computer applications for electromagnetics education. He has authored or coauthored over 80 technical papers and reports on applied electromagnetics antenna design and microwave subjects. Dr. Elsherbeni is a senior member of the Institute of Electrical and Electronics Engineers (IEEE) belonging to the Antennas and Propagation Microwave Theory and Techniques and Magnetics Societies. His honorary memberships include the Electromagnetics Academy and the Scientific Sigma Xi Society. Patrick Ginn:was born in Corinth Mississippi on June 30 1969. Mr. Ginn attended Kossuth High School where he was awarded the STAR student award. He attended Northeast Mississippi Junior College from 1987 to 1989. In 1989 he began attending the University of Mississippi. He is currently enrolled as an undergraduate in the Electrical Engineering Department. Mr. Ginn expects to receive his BSEE in August 1992. He has r

This article describes a software package useful for the instruction of antenna array theory. The program provides the radiation pattern of different types of antennas, the array factor of linear, two-dimensional and three-dimensional arrays, and the total radiation pattern. The elements of the array are isotropic source, Hertzian dipole, straight thin wire dipole, and finite line source with uniform current distribution. The user has the freedom to choose one of the supported element types or to provide the pattern of an antenna element based on experimental or calculated data. This article serves as a tutorial for selected examples as well as a quick guide for the use of this software.

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FIELD SAMPLING OF RESIDUAL AVIATION GASOLINE IN SANDY SOIL

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GROUND WATER MONITORING AND REMEDIATION 1991年第2期11卷 107-120页

作者： OSTENDORF, DW LEACH, LE HINLEIN, ES XIE, YF 1 David W. Ostendorf is an associate professor in the Environmental Engineering Program of the Civil Engineering Department at the University of Massachusetts (Civil Engineering Department University of Massachusetts Amherst MA 01003). His research interests include unconfined aquifer contamination hazardous waste site remediation and analytical modeling of problems in environmental fluid mechanics. Dr. Ostendorf is a registered professional engineer in Massachusetts and a member of the American Geophysical Union American Society of Civil Engineers Soil Science Society of America Water Pollution Control Federation and Association of Environmental Engineering Professors as well as the National Water Well Association.2 Lowell E. Leach is an environmental engineer with the Robert S. Kerr Environmental Research Laboratory of the U.S. Environmental Protection Agency (RS Kerr Environmental Research Laboratory U.S. EPA P.O. Box 1198 Ada OK74820). Leach received his B.S. ingeological engineering at the University of Oklahoma in 1959 and has been a registered professional engineer in Oklahoma since 1966. With 29 years of experience in field applications of geological engineering he is responsible for developing methodology for sampling ground water and subsurface materials for the Robert S. Kerr Environmental Research Laboratory.3 Erich S. Hinlein is a research assistant in the Environmental Engineering Program of the Civil Engineering Department at the University of Massachusetts (Civil Engineering Department University of Massachusetts Amherst MA 01003). His research interests include ground water pollution hazardous waste site investigation and transport processes in unconfined aquifers. Hinlein graduated with a B.S. in electrical and computer engineering from the University of Massachusetts at Amherst in May 1985 and entered the Environmental Engineering Master's Degree Program in January 1989.4 Yuefeng Xie is a postdoctoral research associate in the Environmental Engineering Program of the Civil E

Two complementary field sampling methods for the determination of residual aviation gasoline content in the contaminated capillary fringe of a fine, uniform, sandy soil were investigated. The first method featured field extrusion of core barrels into pint-size Mason jars, while the second consisted of laboratory partitioning of intact stainless steel core sleeves. The barrel extrusion procedure involved jar headspace sampling in a nitrogen-filled glove box, which delineated the 0.7m thick residually contaminated interval for subsequent core sleeve withdrawal from adjacent boreholes. Soil samples removed from the Mason jars (in the field) and sleeve segments (in the laboratory) were subjected to methylene chloride extraction and gas chromatographic analysis to compare their aviation gasoline content. The barrel extrusion sampling method yielded a vertical profile with 0.10m resolution over an essentially continuous 5.0m interval from the ground surface to the water table. The sleeve segment alternative yielded a more resolved 0.03m vertical profile over a shorter 0.8m interval through the capillary fringe. The two methods delivered precise estimates of the vertically integrated mass of aviation gasoline at a given horizontal location, and a consistent view of the vertical profile as well. In the latter regard, a 0.2m thick lens of maximum contamination was found in the center of the capillary fringe, where moisture filled all voids smaller than the mean pore size. The maximum peak was resolved by the core sleeve data, but was partially obscured by the barrel extrusion observations, so that replicate barrels or a half-pint Mason jar size should be considered for data supporting vertical transport analyses in the absence of sleeve partitions.

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Additional core losses in induction machines with pwm inverter

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European Transactions on electrical Power 1991年第4期1卷 189-193页

作者： Wahsh, S. El‐Bakry, M. Dr.-Ing. Mahmoud El-Bakry (1942) received his B. Sc. and M. Sc. dcgrees in Electrical Engineering (Comrnunications & Electronics) from Cairo UniversityEgypt in 1963 and 1974 respectively. and the Dr.-Ing. degree from University of BremedGermany in 1979. He is now Associate Professor at Power Electronics and Energy Conversion Department of the Electronics Research Institute Dokki Cairo. His research activities include Power Electronics Operation Research and Computer Hardware. He is working on research projects with the Egyptian industry to introduce modem computer technology in management and production. (Electronics Research Institute Power Electronics Lab.Sh. El-Tahrir Dokki Cairo Egypt T +202/71 1631) Prof. Said Wahsh (1945) received the B. Sc. degree in Electrical Engineering from Ain Shams University Cairo/Egypt in 1967. In 1973 he joined National Research Center (NRC) as a researcher in the Electrical and Electronic Laboratory. He received his Ph. D. degree in Electrical Drives from the Budapest Technical University/Hungary in 1980. Since 1980 he is working as Assistant Professor at Electronics Research Institute (ERI) NRC and since 1984 he is head of the Power Electronics Laboratory. In 1990 he became Professor of Electrical Engineering in ERI. His major field of interest includes Power Electronics and Electrical Drives.(Electronics Research Institute Power Electronics Lab. Sh. El-Tahrir Dokki Cairo Egypt.T +202/71 1631)

Induction machine drives with squirrel‐cage rotor will more and more replace the DC motor for its various advantages. The additional motor losses are essentially copper and iron losses in stator and rotor. Iron losses are significantly influenced by machine construction, magnetic materials used and supply type. Different formulae and estimations are given in the literature for these losses. In this contribution a method is presented for the calculation of additional iron losses in induction machines with PWM inverter. Two limits are deduced for the calculation of eddy‐current losses, within which the losses lie, and which agree with the theoretical basis and most empirical formulae given in the previous works. Similarly a new method is proposed for the additional hysteresis losses. The proposed methods give good results compared with the other known methods. Copyright © 1991 John Wiley & Sons, Ltd.

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FULL-WAVE SOLUTION OF DIELECTRIC LOADED WAVE-GUIDES AND SHIELDED MICROSTRIPS UTILIZING FINITE-DIFFERENCE AND THE CONJUGATE-GRADIENT METHOD

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INTERNATIONAL JOURNAL OF MICROWAVE AND MILLIMETER-WAVE computer-AIDED engineering 1991年第4期1卷 346-357页

作者： NARAYANAN, V MANELA, M LADE, RK SARKAR, TK Department of Electrical and Computer Engineering Syracuse University Syracuse New York 13244-1240 Viswanathan Narayanan was born in Bangalore India on December 14 1965. He received the BE degree in Electronics and Communications from B.M.S. College of Engineering Bangalore in 1988. He joined the Department of Electrical Engineering at Syracuse University for his graduate studies in 1989 where he is currently a research assistant. His research interests are in microwave measurements numerical electromagnetics and signal processing. Biographies and photos are not available for M. Manela and R. K. Lade. Tapan K. Sarkar (Sf69-M'76-SM'X1) was born in Calcutta. India on August 2 1948. He received the BTech degree from the Indian Institute of Technology Kharagpur India in 1969 the MScE degree from the University of New Brunswick Fredericton Canada in 1971. and the MS and PhD degrees from Syracuse University. Syracuse NY in 1975. From 1975-1976 he was with the TACO Division of the General Instruments Corporation. He was with the Rochester Institute of Technology (Rochester NY) from 1976-1985. He was a Research Fellow at the Gordon Mckay Laboratory Harvard University Cambridge MA from 1977 to 1978. He is now a Professor in the Department of Electrical and Computer Engineering Syracuse University. His current research interests deal with numerical solutions of operator equations arising in electromagnetics and signal processing with application to system design. He obtained one of the “ best solution” awards in May 1977 at the Rome Air Development Center (RADC) Spectral Estimation Workshop. He has authored or coauthored more than 154 journal articles and conference papers and has written chapters in eight books. Dr. Sarkar is a registered professional engineer in the state of New York. He received the Best Paper Award of the IEEE Transactions on Electromagnetic Compatibility in 1979. He was an Associate Editor for feature articles of the lEEE Antennas arid Propagation Sociefy Newsletter and was

Dynamic analysis of waveguide structures containing dielectric and metal strips is presented. The analysis utilizes a finite difference frequency domain procedure to reduce the problem to a symmetric matrix eigenvalue problem. Since the matrix is also sparse, the eigenvalue problem can be solved quickly and efficiently using the conjugate gradient method resulting in considerable savings in computer storage and time. Comparison is made with the analytical solution for the loaded dielectric waveguide case. For the microstrip case, we get both waveguide modes and quasi-TEM modes. The quasi-TEM modes in the limit of zero frequency are checked with the static analysis which also uses finite difference. Some of the quasi-TEM modes are spurious. This article describes their origin and discusses how to eliminate them. Numerical results are presented to illustrate the principles.

关键词： Waveguides

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LABORATORY PROCEDURES FOR DETERMINING 30 TIME-TEMPERATURE PARAMETERS FOR CONVECTIVE HEAT PROCESSING: A RESEARCH TOOL FOR NUTRIENT ANALYSIS

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Journal of Foodservice 1991年第1期6卷

作者： N. IBRAHIM Ph.D. N. UNKLESBAY Ph.D K. UNKLESBAY Ph.D. K. BIEDRZYCKI Ph.D. Professor College of Agriculture Food Science and Nutrition Department Room 122 Eckles Hall University of Missouri-Columbia Columbia MO 65211 Professor College of Engineering Electrical and Computer Engineering Department University of Missouri-Columbia Columbia MO 65211 Assistant Professor Human Nutrition Institute Warsaw Agricultural University Nowoursynowska 166 02–765 Warsaw POLAND

A laboratory procedure was developed to study a wide range of time and temperatures during convective heat processing of a pork/soy hull product. The procedure reduces labor costs associated with extensive nutrient analyses studies. As experimental examples, these heat processing parameters were used to examine the yield and fat and cholesterol content of the product. The curve fits for time-temperature profiles were identified as quadratic equations. To further quantify these profiles, two expressions were calculated: (1) the integral (°C min), or area under the curve, and (2) the second derivative (°/min 2 ), or acceleration of the heat penetration curve. The integral of the quadratic curve fit of time-temperature profiles ranged from 156 to 6318°C/min. Positive correlations were found between moisture content and product yield and the fat content and cholesterol. Negative relationships were found between the integral and product yield, and the integral and moisture content. Recommendations were made for applying this procedure for nutrient analyses studies.

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New algorithms for earthfault distance protection in insulated and compensated networks

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European Transactions on electrical Power 1991年第5期1卷 253-259页

作者： Igel, M. Koglin, H.‐J. Schegner, P. Dr.-lng. Michael Igel (1961). VDE received his Dip1.-lng. degree in Electrical Engineering at the University of SaarlandGermany. in 1987 and became scientific assistant at the Lehrstuhl fur Energieversorgung of this University. After receiving his Dr.-Ing. degree in 1990. he presently works as development engineer of the department of protection systems in the power transmission and distribution division of AEG at Frankfurt a. M./Germany. (AEG Aktiengesellschaft Lyoner Str. 44-48. D-6000 Frankfurt 7 I T + 49 69/66 40 16 I 7) Prof. Dr.-lng. Hans-Jurgen Koglin (1937). VDE holds the Lehrstuhl fur Energieversorgung of the University of SaarlandGermany since 1983. After the study of Electrical Engineering (power engineering) at the Technische Hochschule DarmstadtIGermany. he worked as a scientific assistant at the “Institut fur Elektrische Enerpieversorgung” of this Unive:rsity. After receiving his Dr.-lng. degree he tirst worked as assistant professor later on as full Professor at the Technische Hochschule Darmstadt (Department “Systemfuhrung in Energieversorgungsnetzen”). He is member i n several national and international committees. His most important research activities are: reliability evaluation computer-optimized network development planning digital network protection systems substation control system state estimation. corrective switching visibility of overhead lines. (Universitat des Saarlandes Lehrstuhl fur Energieversorgung Im Stadtwald D-6600 Saarbriicken I I T + 4 9 6 8 113 023979) Dr.-Ing. Peter Schegner (1955) VDEis head of the development department of protection systems in .the power transmission and distribution division of AEG at Frankfurt a. M./Gerrnany. He studied Electrical Power Engineering at the Technische Hochschule Darmstadt/Genany and worked as system engineer in the field of power system control. He became a member of the scientific staff at the Universitiit des Saarlandes receiving his degree with a thesis on the earthfault distance protection. (AEG Aktiengesellschaft

Through the analysis of transient signals after the occurrence of an earthfault it is possible to evaluate fault direction and fault distance. The faulty line is simulated by using a three phase Tl‐model. The result is a differential equation of a higher order, which only consists of voltages and currents, which are measured at the installation point of the relay. If the capacities of the part of the network without earthfault are considerably larger than those of the faulty line, the line capacities of the faulty line can be ignored in the differential equation. This results in afirst‐jorder differential equation, which can be solved by integration in the time domain. A second algorithm takes the line capacities into consideration. The derivatives of the input signals are calculated in the frequency domain. A third algorithm calculates the equivalent fault inductivity in the frequency domain by complex division. The last algorithm deals with the line capacities by using correction factors. The mode of operation of the earthfault distance algorithms presented here will be shown with the example of a 22‐kV‐overhead line network. Copyright © 1991 John Wiley & Sons, Ltd.

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CONCEPTIONAL CONSIDERATIONS FOR A TOWED VESSEL SAFETY KNOWLEDGE SYSTEM

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NAVAL ENGINEERS JOURNAL 1990年第1期102卷 68-73页

作者： LATORRE, R LESAGE, M Dr. Robert Latorre:received a BSE (Naval Architecture and Marine Engineering) in 1971 and an MSC in 1972 from the University of Michigan. After language training at Middle Language College he studied at the University of Tokyo's Department of Naval Architecture where he received a MSE in 1975 and a doctor of engineering degree in 1978. As an assistant professor at the University of Michigan (1979–1983) Dr. Latorre began his study of towed vessel safety and river tow design. This resulted in a multiyear project sponsored by the U.S. Dept. of Transportation on towed vessel safety. This work was continued after he joined the University of New Orleans where he designed a 38.3m × 4.6m × 0.03–2.1m variable depth towing tank for ship offshore and inland waterway hydrodynamic studies. His research interests include cavitation noise high speed craft design and computational fluid dynamics. During the 1986 academic year he taught as a professor at the University of Tokyo's Mechanical Engineering Department. During this time he began to interact with artificial intelligence robotics and computer vision researchers in Japan. Mauricio Le Sage:received his BSC (bachelor's degree) in 1986. He is a graduate student at the University of New Orleans. His research interests are in the areas of artificial intelligence computer graphics and expert systems. At the time of this paper a joint effort entitled “An Inductive Approach To Plagiarism Detection In Computer Programs” by Gerard K. Rambally and Mauricio Le Sage was pending publication.

A new model is introduced for avoiding accidents where a tugboat capsizes or trips when towing a larger vessel. The development of the Tripping Avoidance Knowledge Base (TAKB) is described in terms of the relevant descriptive parameters, the graphical representation of the knowledge base and its conversion to a decision matrix is also shown. As with any AI application in a new and promising area, there are many unclear points which this paper highlights. The paper closes with the authors' recommendations for future development and refinement of the knowledge base.

关键词： Tugboats

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COMPUTATIONAL REQUIREMENTS OF CUSTOMIZED NEWTON-EULER ALGORITHMS

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JOURNAL OF ROBOTIC SYSTEMS 1985年第3期2卷 309-327页

作者： KHOSLA, PK NEUMAN, CP Department of Electrical and Computer Engineering The Robotics Institute Carnegie-Mellon University Pittsburgh PA 15213 Graduate student Department of Electrical and Computer Engineering. Professor of Electrical and Computer Engineering.

To reduce the computational requirements of the Newton-Euler (N-E) algorithm for real-time applications, we customize the algorithm for specific manipulator designs. We analyze the computational requirements of the algorithm for designs incorporating practical kinematic and dynamic parameter simplifications. We illustrate our approach by customizing the N-E algorithm for the CMU direct drive arm II (DD Arm II). Our customized algorithm reduces the computational requirements of the general-purpose N-E algorithm by 56 percent. We describe the hardware implementation of our customized algorithm on a Marinco array processor. Our prototype computes in 1.2 ms the inverse dynamic torques for each trajectory set-point.

关键词： MATERIALS HANDLING

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PROGRAMMING LANGUAGE STANDARDS

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SOFTWARE-PRACTICE & EXPERIENCE 1979年第3期9卷 249-249页

作者： JONES, PR 99 Baracchi Crescent Giralang ACT 2617 Australia Assistant Professor Department of Electrical Engineering and Computer Science University of California Santa Barbara Calif. 93106 U.S.A.

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A NEW HIGH‐PRECISION, UNIVERSAL‐FREQUENCY computer COMPONENT

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Journal of the American Society for Naval Engineers 1950年第2期62卷 325-338页

作者： HERR, DONALD BLUMENSTOCK, NORMAN HONORARY MEMBER THE AUTHORS MR. HERR Honorary Member of the A.S.N.E. has the B.S. in E.E. M.S. in E.E. and E.E. degrees. He was National Coffin Foundation Fellow of the General Electric Company National Tau Beta Pi Fellow and National Sigma Tau Fellow at the Moore School of Electrical Engineering University of Pennsylvania and at M.I.T. prior to World War II. He was also awarded a National Gordon McKay Fellowship by Harvard University and received the A. Atwater Kent Award in Electrical Engineering from the University of Pennsylvania. A licensed radio amateur at 12 Mr. Herr first worked summers at RCA and Bell Laboratories and was with the General Electric Company in 1939 and 1940 as development engineer before volunteering for over five years of active Naval duty. He served as Officer-in-Charge Electrical Minesweeping Group Bureau of Ships December 1940 to April 1943 as Acting Design Superintendent and Officer-in-Charge Los Angeles-Long Beach Harbor Surge Investigation U. S. Naval Shipyard Terminal Island to November 1944 and as Research-Patents Liaison Officer Office of Naval Research to January 1946 returning to inactive duty as lieutenant commander U.S.N.R. Mr. Herr received two Navy letters of commendation. Since 1946 he was assistant to vice president in charge of the engineering division of Control Instrument Company Brooklyn New York and is project engineer at the Reeves Instrument Corporation responsible for new servo and computer component developments. Mr. Herr has been associated with Dean Harold Pender and Professor Ernst Guillemin in advanced network theory and has specialized for 12 years in development and design of servomechanisms differential analyzers computers and fire control systems utilizing advanced network analysis and synthesis methods. Mr. Herr is also presently teaching servomechanisms network-synthesis and feedback amplifier design in the Graduate School of the Polytechnic Institute of Brooklyn. He has contributed frequently to the JOURNAL OF THE AMERICA

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