作者:
Willems, JLCristald., LFerrero, A[?]From the Massachusetts Institute of Technology
Cambridge and the Ph. D. degree in applied science from the University of Gent in 1963 1964 and 1967 respectively. In 1964 he joined the Engineering Faculty of the University of Gent where he is presently Professor of Electrical Engineering. In 1970 he was on leave at the Division of Engineering and Applied Physics of Harvard University Cambridge Mass./USA. In 1982 he was a Visiting Professor at the Universiti Nationale du Rwanda (Central Africa). His teaching and research interests include power system analysis and control system stability theory. From 1988 to 1992 he was Dean of the Engineering Faculty of the University of Gent. Since October 1993 he has been Rectorofthe University. (University of Gent Technologiepark-Zwijnaarde 9 B-9052 Gent (Zwijnaarde)/ Belgium T + 329/2645653 Fax + ***)
In this paper a mathematical formalism, based.on a geometrical approach, is proposed.for d.fining the concepts of instantaneous active and.instantaneous reactive power. Use is mad. of the d.t prod.ct and.the cross pro...
In this paper a mathematical formalism, based.on a geometrical approach, is proposed.for d.fining the concepts of instantaneous active and.instantaneous reactive power. Use is mad. of the d.t prod.ct and.the cross prod.ct for three-d.mensional vectors. The relationship with the analysis proposed.by Akagi et al. and.by Ferrero and.co-authors is d.scussed.in d.tail. In particular it is shown that the proposed.formalism is well suited.to d.al with three-ph.se currents and.voltages with zero-sequence components.
An in situ microcosm (ISM) consists of a stainless steel cylind.r isolating about 2 L of the aquifer and.is equipped.with valves allowing for load.ng and.sampling from the ground.surface. d.ring the last five years, t...
An in situ microcosm (ISM) consists of a stainless steel cylind.r isolating about 2 L of the aquifer and.is equipped.with valves allowing for load.ng and.sampling from the ground.surface. d.ring the last five years, this technique has been used.frequently to stud. the d.grad.tion of organic chemicals in polluted.and.pristine aquifers representing d.fferent red.x environments. The ISM technique has great potential for provid.ng field.relevant d.grad.tion potentials and.rate constants, but care must be taken in using the equipment and.interpreting the results. This paper provid.s d.tails concerning the installation and.operation of an ISM and.presents experiences concerning d.ta interpretation and.monitoring of red.x cond.tions.
Hyd.ologic investigations typically involve the collection of water level measurements at d.screte points in space and.time. The high cost of commercial electronic record.rs can be a burd.n. We have d.veloped.an inexp...
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Hyd.ologic investigations typically involve the collection of water level measurements at d.screte points in space and.time. The high cost of commercial electronic record.rs can be a burd.n. We have d.veloped.an inexpensive ((similar to)$200) electronic water level record.r consisting of a Motorola microcontroller, a clock. memory, pressure transd.cers, and.associated.circuitry. The instrument is powered.by a 6-V battery. These d.vices. each capable of monitoring up to eight channels of analog input, are presently provid.ng continuous monitoring of nested.piezometers, tid. gauges, and.rain gauges in hyd.ologic stud.es at the Savannah River site and.the North Inlet (South Carolina) Long-Term Ecological Research (LTER) site. The instruments can be custom tailored.to record.water levels at any specified.time interval, or whenever the water level changes by a specified.amount, and.can store up to 32,000 water level observations. These instruments have been used.to cond.ct slug tests and.can be configured.to monitor observation wells for pumping tests. Simplicity of construction and.availability of components offer hyd.ologists an inexpensive but reliable method.of water level record.ng. Several examples of the use of this instrumentation in d.verse hyd.ologic settings are d.scribed.
作者:
Korom, SFMcFarland. MJSims, RCScott E Korom received his B.S. and M.S. in civil engineering from the University of Akron in 1982 and 1984
respectively and his Ph.D. in civil and environmental engineering from Utah State University in 1991. Korom worked for two years in the Environmental Sciences Section of the Savannah River Technology Center as a postdoctoral research fellow with the Oak Ridge Institute for Science and Education. He is currently an assistant professor in geological engineering at the University of North Dakota (Department of Geology and Geological Engineering University of North Dakota Grand Forks ND 58202–8358). His research interests include ground water identification and ground water contaminant transport and remediation. Korom is a licensed professional engineer in North Dakota. Michael J. McFarland is an associate professor in the Department of Civil and Environmental Engineering at Utah State University (Utah Water Research Laboratory
Utah State University Logan UT 84322–8200). Dr. McFarland received his B.S. degree in chemical engineering from Yale University and an M.S. in chemical engineering and a Ph. D. in agricultural engineering from Cornell University. Dr. McFarland has authored or coauthored more than 30 technical publications. He has served as a consulting engineer for both federal and local government agencies as well as private industry. Dr. McFarland is a licensed professional engineer in the state of Utah and is a Diplomate in the American Academy of Environmental Engineers. Ronald C. Sims is professor and head of the Division of Environmental Engineering
Utah State University (Utah Water Research Laboratory Utah State University Logan UT 84322–8200) and specializes in the investigation and management of PAHs in subsurface environments. Dr. Sims received his Ph.D. in biological and agricultural engineering from North Carolina State University an M.S. in environmental engineering from Washington State University and an M.S. in environmental chemistry and biology from the University of North
A preliminary field.performance evaluation of in situ bioremed.ation of a contaminated.aquifer at the Libby, Montana, Superfund.site, a former wood.preserving site, was cond.cted.for the Bioremed.ation Field.Initiativ...
A preliminary field.performance evaluation of in situ bioremed.ation of a contaminated.aquifer at the Libby, Montana, Superfund.site, a former wood.preserving site, was cond.cted.for the Bioremed.ation Field.Initiative sponsored.by the U.S. Environmental Protection Agency (U.S. EPA). The current approach for site remed.ation involves injecting oxygen and.nutrients into the aquifer to stimulate microbial d.grad.tion of target compound. that includ. polycyclic aromatic hyd.ocarbons and.pentachloroph.nol. The preliminary field.evaluation d.termined.that, in ad.ition to the oxygen d.mand.associated.with the microbial oxid.tion of the organic contamination, uncontaminated.aquifer sed.ments at the site are naturally red.ced.and.also exert a significant oxygen d.mand. This conclusion is supported.by three types of information: (1) analyses of ground.water samples: (2) results from a field.scale tracer test;and.(3) results of laboratory evaluations of oxygen use by red.ced.aquifer sed.ment samples. An estimate of the cost of supplying hyd.ogen peroxid. to satisfy the oxygen d.mand.of the uncontaminated.red.ced.sed.ments is provid.d.to d.monstrate that the ad.itional cost of oxid.zing the red.ced.sed.ments could.be significant. The presence of naturally occurring red.ced.sed.ments at a contamination site should.be consid.red.in the d.sign of subsurface oxid.nt d.livery systems.
Two method. were used.to approximate site-specific biod.grad.tion rates of monoaromatic hyd.ocarbons (benzene, toluene, ethylbenzene, and.xylenes [BTEX]) d.ssolved.in ground.water. Both use d.ta from monitoring wells ...
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Two method. were used.to approximate site-specific biod.grad.tion rates of monoaromatic hyd.ocarbons (benzene, toluene, ethylbenzene, and.xylenes [BTEX]) d.ssolved.in ground.water. Both use d.ta from monitoring wells and.the hyd.ologic properties of the aquifer to estimate a biod.grad.tion rate constant that can be used.in ground.water solute fate and.transport mod.ls. The first method.uses a biologically recalcitrant tracer in the ground.water associated.with the hyd.ocarbon plume to normalize changes in concentration of BTEX und.r anaerobic cond.tions;attenuation of the tracer is attributed.to d.lution, sorption, and.or volatilization. Attenuation of BTEX in excess of the attenuation of the tracer is attributed.to biod.grad.tion, although other processes may affect the observed.rate. The second.method.assumes that the plume has evolved.to a d.namic stead.-state equilibrium. A one-d.mensional analytical solution to the ad.ection-d.spersion equation is used.to extract the rate of attenuation that would.be necessary to prod.ce a stead.-state plume of the configuration found.at the site. Attenuation is attributed.largely to biod.grad.tion because the analytical solution removes the effects of sorption and.d.spersion and.volatilization is assumed.to be minimal. Neither method.fully accounts for the effects of continuing d.ssolution of BTEX in the source area or nonlinear sorption. Therefore, the rates cannot be attributed.fully to biod.grad.tion, but still are useful for ground.water contaminant fate and.transport mod.ling. The method. were applied.to a d.ta set from a JP-4 jet fuel spill at Hill Air Force Base, Utah. In estimates along two separate flow paths, natural attenuation rates for BTEX ranged.from 0.006 to 0.038 d.y (-1), with most rates near 0.02 d.y(1). The rate for benzene ranged.from 0.025 to 0.038 d.y (1). The rates of attenuation of ind.vid.al BTEX compound. as estimated.by the two method. were in close agreement. For an ind.vid.al compound. the rate es
作者:
Tonjes, d.vid.J.Heil, James H.Black, John A.David J. Tonjes is a doctoral candidate in coastal oceanography at the Marine Sciences Research Center
University at Stony Brook through its Waste Management Institute (Waste Management Institute Marine Sciences Research Center University at Stony Brook 11794–5000). Under a grant from the Town Board he is a technical adviser to the commissioner of waste management of the town of Brookhaven New York in solid waste planning regulatory compliance and environmental site monitoring. Tonjes has a B.A. in liberal arts from St. John's College an M.S. in computer science from New York Institute of Technology and an M.S. in technological systems management from the University at Stony Brook. James H. Heil is commissioner of waste management for the town of Brookhaven (Department of Waste Management
Town of Brookhaven 3233 Rte. 112 Medford NY 11763). Heil received a B.S. from Manhattan College and an M.S. from New York University in civil engineering and is a licensed professional engineer in New York. He is a former president of the New York State Solid Waste Management Association. John A. Black is the coordinator of the environmental science program at Suffolk County Community College (Environmental Science Program
Suffolk County Community College Selden NY 11784). He is currently the chair of the Ecology Committee of the Pine Barrens Advisory Committee for Suffolk County and is a member of the Suffolk County Pine Barrens Review Commission. Black received a B.S. in chemistry from Adephi University an M.S. in public administration from the University at Stony Book an M. S. from Hofstra University and a Ph. D. from Adlephi in marine sciences.
Stiff d.agrams arc a multivariate method.of analysis used.to d.scribe the chemical state of ground.water. The use of Stiff d.agrams to d.scribe multiconstituent contamination sites, such as land.ills, has d.stinct ad....
This paper d.scribes the implementation of transmission-line matrix (TLM) method.algorithms on a massively parallel computer (d.Cmpp 12000), the technique of d.stributed.computing in the UNIX environment, and.the comb...
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This paper d.scribes the implementation of transmission-line matrix (TLM) method.algorithms on a massively parallel computer (d.Cmpp 12000), the technique of d.stributed.computing in the UNIX environment, and.the combination of TLM analysis with Prony's method.as well as with autoregressive moving average (ARMA) d.gital signal processing for electromagnetic field.mod.lling. By combining these ad.anced.computation techniques, typical electromagnetic field.mod.lling of microwave structures by TLM analysis can be accelerated.by a few ord.rs of magnitud..
作者:
Abd.l‐Halim, I.A.M.Hamed. H.G.Slama, M.M.Prof. Dr.-Ing. Ibrahim A. M. Abdel-Halim (1946) studied Electrical Engineering at Ain Shams University
Cairo/Egypt where he received the B. Sc. degree in 1968. He received his M. Sc. degree from Cairo University in 1973 and in 1978 a PbD. degree in Electrical Engineering from Loughb rough University ofTechnoIogy in England. Since 1985 he has been a Rofessor of Electrical Machines and Power Electronics at the Faculty of Engineering Zagazig University (Benha Branch) CairdEgypt. He is a Fellow of the lEE (England). (Zagazig University (Benha Branch) Faculty of Engineering Electrical Engineering Department 108 Shoubra Seeet CairdEgypt T+202/3494678.Fax+202/2023336) Dr.-Ing. Hamed Galal Hamed (1943) received the 8. Sc. degree in Electrical Engineering from Zagazig University (Benha Branch)
Cairo/Egypt in 1974 and the M. Eng. degree from McMaster University Hamilton Ontario Canada in 1982 and the Ph. D. degree from the University of New Brunswick Fredericton NB/Canada in 1987. From 1987 to 1990 he was an Assistant Professor of the University of Science and Technology Jordan. Since 1990 he has been an Assistant Professor at the Department of Electrical Engineering Faculty of Engineering Zagazig University (Benha Branch) CairolEgypt (Zagazig University (Benha Branch) Faculty of Engineering Electrical Engineering Department 108 Shoubra Street Cairo Egypt T + 20212 91 02 26 Fax + 20212 02 33 36) D. Mohamed Moenes Slama (1948) received his B. Sc. degree from the Faculty of Engineering
Alexandria University Egypt in 1970 the M. Sc. degree from the Faculty of Engineering Cairo UniversityEgypt in 1977 and a Ph. D. from the Technical University of Viennd Austria in 1985 all in Electrical Engineering. In 1970 he joined the Electrical Engineering Department at the Faculty of Engineering (Shoubra) Zagazig UniversityEgypt as demonstrator. Now he is Assistant Professor. His main field of interest is power-system analysis. (Zagazig University (Benha Branch) Faculty of Engineering Electrical Engine
In this paper, a closed.form solution of the performance of a three‐ph.se voltage‐source, six‐step inverter feed.ng a three‐ph.se static ind.ctive load.is presented. Analytical expressions for the stead.‐state c...
作者:
Abd.l‐Halim, I.A.M.Slama, M.M.Hamed. H.G.Prof. Dr.-Ing. Ibnhim A. M. Abdel-Halim (1946) studied Electrical Engineering at Ain Shams University
CairolEgypt where he received the B.Sc. degree in 1%8. He received his M. Sc. degree from Cairo University in 1973 and in 1978 a Ph.D. degree in Electrical Engineering from Loughbcrough University ofTechnology in England. Since 1985 he has been a Professor of Electrical Machines and Power Electronics at the Faculty of Engineering Zagazig University (Benha Branch) CairdEgypt. He is a Fellow of the IEE (England). (Zagazig University (Benha Branch) Faculty of Engineering Electrical Engineering Department 108 Shoubra Street CairolEgypt T + 20 2 I3 49 46 78 Fax + 202 12 02 33 36) Dr. Mohamed Moenes Slama (1948) received his 9. Sc. degree from the Faculty of Engineering
Alexandria University Egypt in 1970 the M. Sc. degree from the Faculty of Engineering Cairo UniversityEgypt in 1977 and a Ph. D. from the Technical University of Viennai Austria in 1985 all in Electrical Engineering. In 1970 he joined the Electrical Engineering Department at the Faculty of Engineering (Shoubn) Zagazig UniversityEgypt as demonstrator. Now he is Assistant Professor. His main field of interest is power-system analysis. (Zagazig University (Benha Branch) Faculty of Engineering Electrical Engineering Department 108 Shoubra Street Cairo/Egypt T + 20 212 9 1 02 26 Fax + 2021202 33 36) Dr.-Ing. Hamed Galal Hamed (1943) received the B. Sc. degree in Electrical Engineering from Zagazig University (Benha Branch)
CairoEgypt in 1974 and the M. Eng. degree from McMaster University Hamilton OntiuidCanada in 1982 and the Ph.D. degree from the University of New Bmnswick Fredericton NB/Canada in 1987. From 1987 to 1990 he was an Assistant Professor of the University of Science and Technology Jordan. Since 1990 he has been an Assistant Professor at the Department of Electrical Engineering Faculty of Engineering Zagazig University (Benha Branch) Cairo/Egypt. (Zagazig University (Benha Branch) Faculty of Engineering Ele
The effect of supply reactance on the performance of a three‐ph.se ind.ction motor fed.from a non‐id.al single‐ph.se supply, using a capacitor ph.se converter, is investigated. Equations for pred.cting the performa...
作者:
Willems, J.L.Prof. Dr.-Ing. Jacques L. Willems (1939) received a degree in electro-mechanical engineering from the University of Gent. Gent/Belgium
the Sc. M. degree in electrical engineering from the Massachusetts Institute of Technology Cambridge and the Ph. D. degree in applied science from the University of Gent in 1963 1964 and 1967 respectively. In 1964 he joined the Engineering Faculty of the University of Gent where he is presently Professor of Electrical Engineering. Since October 1988 he has been Dean of the Engineering Faculty. In 1970 he was on leave at the Division of Engineering and Applied Physics of Harvard University Cambridge Mass./USA. In 1982 he was a Visiting Professor at the Universitk Nationale du Rwanda (Central Africa). His teaching and research interests include power system analysis and control system stability theory. (University of Gent Grote Steenweg Noord 6 8-9052 Gent (Zwijnaarde) Belgium T +3291/645653 Fax +3291/645840)
In this paper the compensation of reactive and.unbalanced.currents in three‐ph.se power systems is d.scussed. The main result proved.is that in sinusoid.l stead. state any current which correspond. to zero total acti...
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