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Field test of the in situ permeable ground water flow sensor

GROUND WATER MONITORING AND REMEDIATION 1997年第4期17卷 81-88页

作者： Alden, AS Munster, CL Andrew S. Alden is an environmental engineer with K.W. Brown Environmental Services (501 Graham Rd. College Station TX 77845). He has worked on projects including aquifer characterization using conventional and experimental methods assessment of ground water contamination from landfills and petroleum exploration and distribution operations the suitability of wetland plants in a constructed wetland and regulatory review under RCRA and TSCA. He received a B.S. in mechanical engineering technology and an M.S. in civil engineering (environmental option) from Texas A&M University. He is registered as an engineer in training in Texas and is a member of the ASCE Clyde L. Munster P.E. is an assistant professor in the Agricultural Engineering Department at Texas A&M University College Station Texas. His primary research interests are field laboratory and computer modeling studies of contaminant transport through soil and ground water. Dr. Munster received a B.S.C.E. in 1980 and an M.S.C.E. in 1981 from Virginia Tech and a Ph.D. in agricultural engineering in 1992 from North Carolina State University.

Two in situ permeable flow sensors, recently developed at Sandia National Laboratories, were field tested at the Brazos River Hydrologic Field Site near College Station, Texas. The now sensors use a thermal perturbation technique to quantify the magnitude and direction of ground water flow in three dimensions. Two aquifer pumping tests lasting eight and 13 days were used to field test the flow sensors. Components of ground water flow as determined from piezometer gradient measurements were compared with ground water flow components derived from the 3-D now sensors. The changes in velocity magnitude and direction of ground water flow induced by the pump were evaluated using flow sensor data and piezometric analyses. Flow sensor performance closely matched piezometric analysis results. Ground water flow direction (azimuth), as measured by the flow sensors and derived in the piezometric analysis, predicted the position of the pumping well accurately. Ground water flow velocities measured by the flow sensors compared well to velocities derived in the piezometric analysis. A significant delay in flow sensor response to relatively rapid changes in ground water flow was observed. Preliminary tests indicate that the in situ permeable flow sensor provides accurate and timely information on the velocity magnitude and direction of ground water flow.

关键词： Groundwater flow

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Hydroelastic considerations in ship panel design

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NAVAL ENGINEERS JOURNAL 1997年第5期109卷 61-66页

作者： McCormick, ME Bhattacharyya, R Mouring, SE Dr. Michael E. McCormick:is a research professor of civil engineering at The Johns Hopkins University. Before joining the Hopkins faculty in 1994 he was a professor of ocean engineering for twenty-five years at the U.S. Naval Academy. In addition he has held full-time faculty positions at Swarthmore College Trinity College (Hartford) and the Catholic University of America. He was also a hydrodynamicist at the David Taylor Model Basin for more than four years. Prof. McCormick received his undergraduate degree in mathematics and physics from AmericanUniversity a masters degree in applied mechanics and a Ph.D. in mechanical engineering from Catholic University a Ph.D. in civil engineering and a Sc.D. in engineering science from Trinity College in Dublin Ireland. He has over 100 publications including two books in the areas of ocean engineering wave mechanics and ocean wave energy conversion. He has also edited two books dealing with ocean engineering. In addition he is co-editor of both the journal Ocean Engineering and the Elsevier book series in ocean engineering. Dr. Rameswar Bhattacharyya:is professor of naval architecture at the U.S. Naval Academy where he has served for twenty-six years and adjunct professor of mechanical engineering at The Johns Hopkins University. Prior to joining the Naval Academy faculty he was a faculty member in the Department of Naval Architecture and Marine Engineering at the University of Michigan. His research experience includes ten years at both the Lubecker Flender-Werke and the Hamburg Ship Model Basin in Germany. His research has led to numerous publications including two books one in the area of ship dynamics and the other in the area of computer-aided ship design. Prof. Bhattacharyya received his undergraduate degree in naval architecture from the Indian Institute of Technology and his doctorate in engineering from the Technical University of Hanover Germany. In addition he holds an honorary doctorate from the University of Veracruz. With Prof. McCormick he co

Panels and all other structural components of surface ships and submarines vibrate when the vessel is underway. The vibratory motions are primarily excited by the power plant. At operational (design) speeds, panels vibrate in their fundamental modes and those associated with their higher harmonic frequencies. The panel motions have rather well-defined energy spectra, which depend on both the structural design, position of the panel and the rotational speed of the single or multiple power plants. The panel motions will interact with the vortices in the adjacent turbulent boundary layer. The interaction can result in either an increase in the frictional drag or a decrease. Because of this, the argument is made that the designs of the panels and their support systems should include considerations of this hydroelastic effect.

关键词： Naval architecture

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Hot methanol extraction for the analysis of volatile organic chemicals in subsurface core samples from Dover Air Force Base, Delaware

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GROUND WATER MONITORING AND REMEDIATION 1997年第1期17卷 104-121页

作者： Ball, WP Xia, G Durfee, DP Wilson, RD Brown, MJ Mackay, DM William P. Ball is an assistant professor in the Department of Geography and environmental engineering at Johns Hopkins University (313 Ames Hall 3400 N. Charles St. Baltimore MD 21218). His research interests are in the physical and chemical processes that control contaminant fate in aqueous systems both in the natural environment and in engineered processes of treatment and remediation. Recent work has included both laboratory and computer modeling studies related to contaminant fate and transport in subsurface environments. Ball holds M.S. and Ph.D. degrees in environmental engineering and science from Stanford University and a B.S. degree in civil engineering from the University of Virginia. He is a registered pro-fessional engineer in the state of Virginia. Guoshou Xia is a Ph.D. candidate at Johns Hopkins University He was previously a lecturer in the Department of Civil Engineering at Southeast University in China. He received his B.S. degree in chemistry from Hefei University and his M.S. degree in environmental engineering from East China University of Chemical Technology. His current research interests are in the area ofsubsurface contaminant transport with emphasis on better understanding the nature of organic contaminant interactions with subsurface solids. Donald P. Durfee received his M.S. degree in environmental engineering from Johns Hopkins University in 1993 and is currently a Ph.D. student at Johns Hopkins. He is studying contaminant fate and transport in the subsurface and is also interested in site characterization and remediation issues. Ryan D. Wilson is a research associate and Ph.D. student in the Department of Earth Sciences at the University of Waterloo Waterloo Ontario. His research interests include field and modeling studies of semipassive remediation technologies and the behavior of gaseous tracers. Wilson received his B.Sc. in geology from the University of Alberta in 1987 and his M.Sc. in earth sciences (hydrogeology) from the University of Waterloo in 1993. Michael J. Br

The evaluation of contaminant concentrations in ground water and soil is an essential aspect of most hazardous waste remedial investigations. This paper describes methods applied toward obtaining, preserving, and analyzing subsurface samples for the determination of VOC concentrations in the saturated region of an unconfined coastal plain aquifer at Dover Air Force Base (DAFB), Delaware. The described protocol involved headspace-free subsampling of cores, field preservation of subsamples in methanol, and overnight extraction of the VOCs at elevated temperature (70 degrees C). Methanol-extracted compounds were subsequently transferred to hexane and analyzed by gas chromatography. The method was found to achieve quantitative extraction from the aquifer sands in a single step, although extraction from fine-grained and more strongly sorbing aquitard samples required multiple methanol extractions to achieve comparable recovery. An extensive set of DAFB results is presented as an indication of how these methods can be applied toward characterizing field-scale contamination with a high degree of resolution and accuracy. These data have enabled a quantitative estimate of the contaminant distribution at this site and offer valuable insight into processes of contaminant migration into the underlying aquitard. In these regards, the methods used are believed to have provided much more accurate results than could have been obtained using more commonly applied techniques.

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Development of the iPOINT Testbed for Optoelectronic Asynchronous Transfer Mode Networking

Development of the iPOINT Testbed for Optoelectronic Asynchr...

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1996 International Conference on Information Infrastructure(ICII’96)

作者： John W Lockwood Sung Mo Kang Stephen G.Bishop Haoran Duan Ashfaq Hossain Visiting Assistant Professor of Electrical and Computer Engineering The University of Illinois at Urbana-Champaign 405 North Mathews Avenue Urbana IL 61801USA Department Head of Electrical and Computer Engineering The University of Illinois at Urbana-Champaign 405 North Mathews Avenue Urbana IL 61801USA Director of the Center for Compound Semiconductor Microelectronics The University of Illinois at Urbana-Champaign 405 North Mathews Avenue Urbana IL 61801USA candidate in Electrical and Computer Engineering The University of Illinois at Urbana-Champaign 405 North Mathews Avenue Urbana IL 61801USA candidate in Computer Science The University of Illinois at Urbana-Champaign 405 North Mathews Avenue Urbana IL 61801USA

＜正＞Asynchronous Transfer Mode（ATM）technology will be used to build Internet backbones and within local-area networks to interconnect personal computers and workstations running network-intensive *** such as the World Wide Web（WWW）,desktop video conferencing, distributed computing,network file systems,and remote access to supercomputing resources have dramatically increased the demand for bandwidth in current *** networks must scale in bandwidth as the computational power of the desktop computer as well as the number of installed computer systems continues to grow exponentially. The Illinois Pulsar-based Interconnection（iPOINT）testbed has been established to desjgn and develop scalable ATM switch architectures,explore multicast scheduUng algorithms to enable one- to-many data delivery,and investigate new techniques for data queuing,Within this testbed,Field Programmable Gate Array（FPGA）technologies have been used to prototype the core logic of the ATM switch,scheduler,and queue *** coniunction of the UIUC microelectronics laboratory,low-cost optoelectronic components have been developed and inserted into the testbed. As a part of the computer science research,an MPEG/JPEG video server and clint has been developed and operates on this fully functional testbed.

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PROGRAM VIEW GENERATION AND CHANGE ANALYSIS USING ATTRIBUTED DEPENDENCY GRAPHS

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JOURNAL OF SOFTWARE MAINTENANCE-RESEARCH AND PRACTICE 1995年第4期7卷 239-261页

作者： ALZOUBI, R PRAKASH, A Software Systems Research Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109-2122 U.S.A. He is currently an Assistant Professor at Yarmouk University Irbed H.K. of Jordan. Earlier he has worked for the Ford Motor Company in Dearborn Michigan. His research interests are in the area of software engineering. Since 1989 he has been with the Department of Electrical Engineering and Computer Science at the University of Michigan Ann Arbor where he is currently an Associate Professor. His research interests include software engineering and computer-supported cooperative work. He is a member of the ACM and the IEEE Computer Society.

Software maintenance is usually the most expensive phase of the software life-cycle, Program understanding and impact-of-change analysis are two of the major activities during this phase, In this paper, we describe attributed program dependency graphs (APDGs), a model to store information derived from the program source code and ease construction of tools for software maintenance, We show how the model can be used for interactive view generation and doing two kinds of impact-of-change analysis-incremental and comparison-oriented. Incremental change analysis uses APDGs and a Rule Base to provide a way for the user to analysis the effect of proposed well-defined changes, Comparison-oriented change analysis allows a user to generate structural semantic differences between two versions of a subsystem after an arbitrary sequence of changes, We also introduce SCAN, a prototype collection of loosely integrated tools based on the APDG model and describe our experiences with the system.

关键词： PROGRAM REPRESENTATION DEPENDENCY GRAPHS PROGRAM UNDERSTANDING REVERSE-engineering REengineering IMPACT ANALYSIS CHANGE ANALYSIS

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OPTIMUM FREQUENCY REUSE IN MOBILE TELEPHONY SYSTEMS

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 1995年第3期8卷 185-190页

作者： KAZANTZAKIS, MG DEMESTICHAS, PP ANAGNOSTOU, ME National Technical University of Athens Computer Science Division Department of Electrical and Computer Engineering Heroon Polytechneiou 9 Zografou Athens 15773 Greece Michael G. Kazantzakii was born in Athens Greece in 1962. He received both the Diploma and Ph.D. Degree from the Electrical Engineering Department of the National Technical University of Athens in 1986 and 1992 respectively. During the period 1992–1993 he was a member of the Staff of the Hellenic Navy Research Centre working in the area of underwater acoustics. Since 1994 he has been a researcher at the National Technical University of Athens Department of Electrical Engineering and Computer Science Telecommunications Laboratory. His interests include data mobile and integrated services networks. Panagiotis P. Demestichas was born in Athens Greece in 1967. He received the Diploma in electrical engineering from the National Technical University of Athens (NTUA) Athens in 1993. At present he is a research assistant at NTUA working towards his Ph.D. dissertation. He participated in the BRITE/EURAM-EURATN and in the RACE-TOMQAT and MONET projects. His research interests are in the areas of broadband and mobile networks queueing theory algorithms and complexity theory. He is a Member of the Technical Chamber of Greece. Miltiades E. Anagnostou was born in Athens in 1958. He received the Electrical Engineers Diploma from the National Technical University of Athens (NTUA) in 1981. During the period 1981–1987 he was a teaching assistant at NTUA. In 1987 he received his Ph.D. in the area of computer networks. In 1987–1989 he served the Greek army in the Air Force Research and Development Center. In 1989–1991 he was a Lecturer and since 1991 he has been an Assistant Professor in the Computer Science Division Department of Electrical and Computer Engineering of the NTUA. He teaches courses on modern telecommunications formal specification of protocols stochastic processes and queueing theory. Since 1981 Dr. Anagnostou has been involved

The reason why cellular mobile telephony systems exist is that they allow frequency reuse. Dynamic allocation algorithms improve the network efficiency and the service quality. Dynamic allocation is closely related to the following instantaneous allocation problem: given a number of channels (frequencies), a cell structure and the number of calls to be accommodated in each cell, find the optimum allocation of channels to cells subject to restrictions concerning the distance of cells, where the same frequency can be reused. In this paper we formulate and solve this problem by showing that it can be reduced to a 0-1 programming problem. Finally we present results, and draw subsequent conclusions.

关键词： MOBILE TELEPHONY FREQUENCY ALLOCATION UMTS

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Use of artificial neural networks: predicting trickling filter performance in a municipal wastewater treatment plant

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Environmental Management and Health 1995年第2期6卷

作者： Hao‐Che Pu Yung‐Tse Hung Assistant Professor of Computer Science Computer and Information Science Department Cleveland State University Cleveland Ohio USA Professor of Civil Engineering Civil Engineering Department Cleveland State University Cleveland Ohio USA

Artificial neural networks (ANN) are used as an alternativefunction approximation tool for predicting the performance of tricklingfilter treatment process in a municipal wastewater treatment plant,Solon, Ohio, USA, which uses a trickling filter followed by an activatedsludge process. The treatment plant had an average monthly inflow flowrate of 2.92 mgd (million gallons per day). The average raw, settled,and final BOD (biochemical oxygen demand) was 449, 235 and 4.8 mg/l,respectively, while the corresponding value for TSS (total suspendedsolids) was 296, 131, and 6.1 mg/l. The overall removal efficiency forBOD and TSS was 98.93 per cent and 97.95 per cent respectively. The bestANN model for predicting the trickling filter effluent BOD and TSS has aprediction error of 31.45 per cent and 32.54 per cent respectively. Thenumber of input variables, as well as number of nodes in hidden layerseemed not to have a definite effect on the prediction error for the ANNmodel. The prediction errors obtained with ANN models were lower thanthose obtained by multiple regression analysis.

关键词： Environment Modelling Multiple regression analysis Neural networks Solon Wasteworks Treatment Plant Statistics Waste

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Using simulation with hardware verification for teaching computer architecture

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computer Applications in engineering Education 1995年第3期3卷 173-173页

作者： Segee, B. Field, J. Littlefield, B. Department of Electrical and Computer Engineering University of Maine Orono Maine 04469—5708 Bruce E. Segee:is an Assistant Professor of Electrical and Computer Engineering at the University of Maine. He received BSEE (1985) and MSEE (1989) degrees from the University of Maine and a PhD from the University of New Hampshire (1992). He is a member of IEEE Eta Kappa Nu Tau Beta Pi and Sigma Xi. Dr. Segee's technical interests are in the areas of computer architecture neural networks instrumentation and industrial automation. He is the co-author of a John Wiley textMicroprogramming and Computer Architecture. John C. Field:is Professor and Chairperson of the Electrical and Computer Engineering Department at the University of Maine. He received the BSEE (1963) MSEE (1965) and PhD (1969) degrees all from Northeastern University. He is a member of IEEE Eta Kappa Nu Tau Beta Pi Sigma Xi and Phi Kappa Phi. Dr. Field's technical interests are in the areas of computers and microprocessor applications. He is the co-author of a John Wiley textMicroprogramming and Computer Architecture.

Material for a computer architecture class based on four progressively more complex microprogrammed circuits is described. The circuits and their associated microassemblers and simulators are discussed. Interestingly, the simulators allow students to understand the workings of the hardware more fully than is possible using the hardware alone.

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PARALLEL AND DISTRIBUTED TLM COMPUTATION WITH SIGNAL-PROCESSING FOR ELECTROMAGNETIC-FIELD MODELING

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第3-4期8卷 169-185页

作者： SO, PPM ESWARAPPA, C HOEFER, WJR NSERC/MPR Teltech Research Chair in RF Engineering Department of Electrical and Computer Engineering University of Victoria Victoria British Columbia V8W 3P6 Canada Poman So received his B.Sc. degree in computer science and physics from the University of Toronto Toronto Onatario Canada in 1985. He obtained his B.A. Sc. and M.A.Sc. degrees in electrical engineering (summa cum laude) from the University of Ottawa Ottawa Ontario Canada in 1987 and 1989 respectively. Mr So was a research engineer in the University of Ottawa from January 1989 to October 1991 his research interests included CAD techniques of microwave circuits and numerical methods for electromagnetic wave modelling. He specialized in the development of electromagnetic engineering CAD software and successfully implemented a number of electromagnetic wave simulators based on the two-dimensional and three-dimensional transmission-line matrix methods. From August 1990 to February 1991 he accompanied Professor W. J. R. Hoefer to Rome Italy and Sophia Antiopolas France. During that time he implemented a parallel version of the 3D-TLM simulator for the CM-2 Connection Machine using C-Star and X Windows Library. He is a research engineer and a Ph.D. student at the University of Victoria Victoria British Columbia Canada. He ported the 2D- and 3D-TLM simulators to DECmpp 1200 massively parallel computer using MPL C and C++. He also combined OSA90/hope a commercially available microwave CAD program with a 2D-TLM simulation module for geometry optimization using the Datapipe technique of OSA90/hope. Recently he has developed a distributed client-server computing technique for the TLM method this technique could accelerate the TLM simulation by more than an order of magnitude. Channabasappa Eswarappa received the M.Tech. degree in electrical engineering from the Indian Institute of Technology Kanpur India in 1983 and Ph. D. degree from the University of Ottawa Canada in 1990. He worked as an Assistant Executive Engineer and later as

This paper describes the implementation of transmission-line matrix (TLM) method algorithms on a massively parallel computer (DECmpp 12000), the technique of distributed computing in the UNIX environment, and the combination of TLM analysis with Prony's method as well as with autoregressive moving average (ARMA) digital signal processing for electromagnetic field modelling. By combining these advanced computation techniques, typical electromagnetic field modelling of microwave structures by TLM analysis can be accelerated by a few orders of magnitude.

关键词： Mathematical models

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Electronic classroom assessment techniques: Assessment beyond the classroom in a networked environment

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Assessment Update 1995年第6期7卷

作者： Anita Gandolfo Curtis A. Carver Professor of English and director of the Center for Teaching Excellence at the United States Military Academy West Point New York Assistant professor in the Department of Electrical Engineering and Computer Science at the United States Military Academy

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