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Conference on Precision Electromagnetic Measurements (CPEM)

作者： Wael Saleh David Wright Philip Slade Nasser Qaddoumi Microwave hnaging & Nondestructive Evaluation Laboratory minel Electrical Engineering Program School of Engineering American University of Sharjah Sharjah UAE Electronic Systems Research Group Department of Engineering School of Engineering and Computer Science University of Exeter Exeter UK

A novel microwave nondestructive testing technique is presented for breast cancer detection. A method utilizing the reflection coefficient at the aperture of a waveguide sensor radiating into a breast is described resulting in theoretical microwave images that clearly indicate the presence of a tumor. These images demonstrate the feasibility of detecting breast tumors using this approach

关键词： Breast tumors Microwave imaging Microwave theory and techniques Nondestructive testing Breast cancer Cancer detection Reflection Apertures Waveguide theory Image sensors

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A low-power CMOS neural amplifier with amplitude measurements for spike sorting

A low-power CMOS neural amplifier with amplitude measurement...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： T. Horiuchi T. Swindell D. Sander P. Abshier Institute for Systems Research Neuroscience and Cognitive Science Program University of Maryland College Park MD USA Electrical and Computer Engineering Department University of Maryland College Park MD USA Electrical and Computer Engineering Department Electrical Engineering Department Pennsylvania State University State College PA USA

Integrated, low-power, low-noise CMOS neural amplifiers have recently grown in importance as large microelectrode arrays have begun to be practical. With an eye to a future where thousands of signals must be transmitted over a limited bandwidth link or be processed in situ, we are developing low-power neural amplifiers with integrated pre-filtering and measurements of the spike signal to facilitate spike-sorting and data reduction prior to transmission to a data-acquisition system. We have fabricated a prototype circuit in a commercially-available 1.5 /spl mu/m, 2-metal, 2-poly CMOS process that occupies approximately 91,000 square /spl mu/m. We report circuit characteristics for a 1.5 V power supply, suitable for single cell battery operation. In one specific configuration, the circuit bandpass filters the incoming signal from 22 Hz to 6.7 kHz while providing a gain of 42.5 dB. With an amplifier power consumption of 0.8 /spl mu/W, the rms input-referred noise is 20.6 /spl mu/V.

关键词： Sorting Signal processing Low-noise amplifiers Microelectrodes Bandwidth Integrated circuit measurements Prototypes CMOS process Power supplies Batteries

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Kinetics of Chlorine Decay in Water Distribution systems

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Journal of Donghua University(English Edition) 2004年第1期21卷 140-145页

作者：周建华薛罡赵洪宾汪永辉郭美芳 Guangzhou Municipal Engineering Design & Research Institute Guangzhou 510060 College of Environmental Science and Engineering Donghua University Shanghai 200051 School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 College of Environmental Science and Engineering Donghua University Shanghai 200051 combined first and second-order model which includes bulk decay and wall decay was developed to describe chlorine decay in water distribution systems. In the model the bulk decay has complex relationships with total organic carbon (TOC) the initial chlorine concentration and the temperature. Except for the initial stages they can be simplified into a linear increase with TOC a linear decrease with initial chlorine concentration and an exponential relationship with the temperature. The model also explains why chlorine decays rapidly in the initial stages. The parameters of model are determined by deriving the best fitness with experimental data. And the accuracy of model has been verified by using the experimental data and the monitoring data in a distribution system.

A combined first and second-order model, which includes bulk decay and wall decay, was developed to describe chlorine decay in water distribution systems. In the model the bulk decay has complex relationships with total organic carbon (TOC), the initial chlorine concentration and the temperature. Except for the initial stages they can be simplified into a linear increase with TOC, a linear decrease with initial chlorine concentration and an exponential relationship with the temperature. The model also explains why chlorine decays rapidly in the initial stages. The parameters of model are determined by deriving the best fitness with experimental data. And the accuracy of model has been verified by using the experimental data and the monitoring data in a distribution system.

关键词： water distribution systems chlorine decay bulk decay wall decay

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Erratum: 4pAB4. Strategies for weighting exposure in the development of acoustic criteria for marine mammals [J. Acoust. Soc. Am. 118(3), 2019 (2005)]

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The Journal of the Acoustical Society of America 2005年第6期118卷 3962-3962页

作者： James H. Miller Anne E. Bowles Brandon L. Southall Roger L. Gentry William T. Ellison James J. Finneran Charles R. Greene, Jr. David Kastak Darlene R. Ketten Peter L. Tyack Paul E. Nachtigall W. John Richardson Jeanette A. Thomas Dept. of Ocean Engineering University of Rhode Island Narragansett Rhode Island 02882 Hubbs-Sea World Research Institute 2595 Ingraham Street San Diego California 92109 NOAA Acoustics Program National Marine Fisheries Service Office of Protected Resources Marine Mammal Division 1315 East-West Highway Silver Spring Maryland 20910–6233 Marine Acoustics Inc. P.O. Box 340 Litchfield Connecticut 06759 Space and Naval Warfare Systems Center 53560 Hull Street San Diego California 92152–5000 Greeneridge Sciences Inc. 4512 Via Huerto Santa Barbara California 93110 Long Marine Laboratory University of California at Santa Cruz 100 Shaffer Road Santa Cruz California 95060 Woods Hole Oceanographic Institution Woods Hole Massachusetts 02543 Hawaii Institute of Marine Biology P.O. Box 1346 Kane'ohe Hawai'i 96744 LGL Ltd. Environmental Research Associates P.O. Box 280 22 Fisher Street King City Ontario L7B 1A6 Canada Western Illinois University Quad Cities 3561 60th Street Moline Illinois 61265

The correct authors and affiliations for this abstract are: James H. Miller (Dept. of Ocean Eng., Univ. of Rhode Island, Narragansett, RI 02882, miller@***)

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Doe's effort to reduce truck aerodynamic drag - joint experiments and computations lead to smart design

Doe's effort to reduce truck aerodynamic drag - joint experi...

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34th AIAA Fluid Dynamics Conference and Exhibit 2004

作者： McCallen, Rose C. Salari, Kambiz Ortega, Jason M. DeChant, Larry J. Hassan, Basil Roy, Christopher J. Pointer, W. David Browand, Fred Hammache, Mustapha Hsu, Tsun-Ya Leonard, Anthony Rubel, Mike Chatalain, Philippe Englar, Robert Ross, James Satran, D. Heineck, James T. Walker, Stephen Yaste, D. Storms, B. Lawrence Livermore National Laboratory Livermore CA 94551 United States Sandia National Laboratories Albuquerque NM 87185-0825 United States Auburn University Auburn AL 36849 United States Argonne National Laboratory Argonne IL 60439 United States University of Southern California LosAngeles CA 90089-1191 United States Georgia Tech Research Institute Atlanta GA 30332 United States NASA Ames Research Center Moffet Field CA 94035 United States Center for Applied Scientific Computing P.O. Box 808 L-98 United States New Technologies Engineering Division P.O. Box 808 L-644 United States Aerosciences and Compressible Fluid Mechanics Dept. PO Box 5800 MS 0825 United States Aerospace Engineering Dept. 211 Aerospace Engineering Bldg United States Nuclear Engineering Division NE-208 United States Aerospace and Mechanical Engineering MS 1191 United States Engineering and Applied Science 1200 East California Blvd. MC 301-46 United States Graduate Aeronautical Laboratories 1200 East California Blvd. MC 205-45 United States Aerospace Transportation and Advanced Systems Code 0844 United States Systems Analysis Branch MS 260-1 United States Aeronautical Projects and Program Office MS 260-1 United States

ISBN: (纸本)9781624100314

At 70 miles per hour, overcoming aerodynamic drag represents about 65% of the total energy expenditure for a typical heavy truck vehicle. The goal of this US Department of Energy supported consortium is to establish a clear understanding of the drag producing flow phenomena. This is being accomplished through joint experiments and computations, leading to the 'smart' design of drag reducing devices. This paper will describe our objective and approach, provide an overview of our efforts and accomplishments, and discuss our future direction. © 2004 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Aerodynamic drag

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Study on the effect of Mach number and initial amplitudes on the evolution of a single-mode shock-induced hydro-dynamic instability

Study on the effect of Mach number and initial amplitudes on...

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The 24th International Symposium on Shock Waves

作者： O.Sadot A.Rikanati D.Oron G.Ben-Dor D.Shvarts Dept.of Physics Nuclear Research Center Negev 84190 Israel Dept. of Mechanical Engineering Ben Gurion University of the Negev Beer-Sheva 84105 Israel Dept.of Physics Nuclear Research Center Negev 84190 Israel Dept.of Physics Ben Gurion University of the Negev Beer-Sheva 84105 Israel Dept.of Physics Nuclear Research Center Negev 84190 Israel Dept.of Physics of Complex Systems Weizmann Institute of Science Rehovot 76100 Israel Dept.of Mechanical Engineering Ben Gurion University of the Negev Beer-Sheva 84105 Israel Dept.of Physics Nuclear Research Center Negev 84190 Israel Dept.of Mechanical Engineering Ben Gurion University of the Negev Beer-Sheva 84105 Israel Dept.of Physics Ben Gurion University of the Negev Beer-Sheva 84105 Israel

In the present study the Mach number and the high-initial amplitudes effects on the evolution of the single-mode shock wave induced instability were investigated. To distinguish between the above-mentioned effects, two sets of shock-tube experiments were conducted: high-initial amplitudes with a low-Mach incident shock;and small amplitude initial conditions with moderate-Mach incident shock. In the high-amplitude experiments a reduction of the initial velocity with respect to the linear prediction was measured. The results were compared to those predicted by a vorticity deposition model and to previous experiments with moderate and high Mach numbers done by others and good agreement was found. The result suggested that the high-initial amplitude effect is the dominant one rather then the high-Mach number effect as suggested by others. In the small amplitude-moderate Mach numbers experiments a reduction from the impulsive theory was noted at late stages.

关键词： Study on the effect of Mach number and initial amplitudes on the evolution of a single-mode shock-induced hydro-dynamic instability

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A Solution to Shape Optimization Problems for the Rigidity Design of Plate and Shell Structures

A Solution to Shape Optimization Problems for the Rigidity D...

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The Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational MechanicsⅠ

作者： Masatoshi Shimoda Jiro Tsuji Yasuhiro Kanda Hisayuki Ishizu Hideyuki Azegami Department of Mechanical Design Engineering Shonan Institute of Technology 1-1-25 Tsujido-nishikaigan Fujisawa 251-8511 Japan Development Planning Department Mitsubishi Automotive Engineering Co. Ltd. 1 Nakashinkiri Hashime-cho Okazaki -444-8501 Japan Okazakilst System Department MMC Computer Research Ltd. 1 Nakashinkiri Hashime-cho Okazaki 444-8501 Japan Digital Technology Dept. Mitsubishi Motors Corp. Hashime-cho Okazaki 444-8501 Japan Dept. of Complex Systems Science Nagoya University Chigusa-ku Nagoya 464-8601 Japan

Plate and shell structures are widelyused in industrial products and structures such as automotives, vessels and architectures for its good formability and lightweight property. This paper presents a numerical shape optimization method for the rigidity design of plate and shell structures. A solution to a compliance minimization problem subject to a volume constraint is proposed, and its reciprocal problem is also solved. The boundaries are assumed to be movable in the in -plane directions so as to keep the initial curvatures in the design domain. For simplicity, the structures to be optimized are discretized by plane elements based on the Mindlin-Reissner plate theory. The problems are formulated as non-parametric, or distributed shape optimization problems involving the design of free boundaries. The shape gradient functions are theoretically derived using the material derivative method and the Lagrange multiplier method. With the shape gradient function, the smooth domain variation that minimizes the objective functional is de termined by the traction method developed by the authors. The validity and practical utility of this numerical solution for the rigidity design of plate and shell structures are verified through simple examples and applications to automotive components.

关键词： Shell A Solution to Shape Optimization Problems for the Rigidity Design of Plate and Shell Structures Shape

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Digital and construction of a digital vehicle proving ground

Digital and construction of a digital vehicle proving ground

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2003 IEEE Intelligent Vehicles Symposium, IV 2003

作者： Wang, Fei-Yue Wang, Xiaojing Li, Li Mirchandani, Pit Wang, Zhixue Program for Advanced Research in Complex Systems University of Arizona TucsonAZ United States Key Laboratory for Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing China National Center for Intelligent Transportation Systems and Engineering Beijing China

ISBN: (纸本)0780378482

关键词： Automobile proving grounds

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Integrated intelligent control and management for urban traffic systems

Integrated intelligent control and management for urban traf...

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2003 IEEE International Conference on Intelligent Transportation systems, ITSC 2003

作者： Wang, Fei-Yue Key Laboratory of Complex Systems and Intelligence Science Chinese Academy of Sciences Beijing China Advanced Research in Complex Systems Department of Systems and Industrial Engineering University of Arizona TucsonAZ United States

ISBN: (纸本)0780381254

This paper is a brief summary of the recent development of integrated intelligent control and management system for urban traffic systems in China at the Key Laboratory for complex systems and Intelligence Sciences of the Chinese Academy of Sciences. The key technologies employed in this development include hierarchical intelligent control systems, agent-based control (ABC) and artificial transportation systems (ATS) for network-enabled traffic operational systems. The integrated system covers surface street intersection signal control, freeway/road entrance/exit ramp metering, and integrated traffic network control, guidance, and management. © 2003 IEEE.

关键词： Control systems

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A Moment-Based Method for Large-Scale Generalized Eigenvalue Problems

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Applied Numerical Analysis & Computational Mathematics 2004年第2期1卷

作者： Tetsuya Sakurai Hiroto Tadano Yuichi Inadomi Umpei Nagashima Department of Computer Science University of Tsukuba Tsukuba 305-8573 Japan Core Research for Evolutional Science and Technology Japan (CREST) Doctoral Program of Systems and Information Engineering University of Tsukuba Tsukuba 305-8573 Japan Grid Technology Research Center National Institute of Advanced Industrial Science and Technology Tsukuba 305-8568 Japan

In this paper we consider a method for finding several eigenvalues and corresponding eigenvectors of large-scale generalized eigenvalue problems. In this method, a small matrix pencil that has only the desired eigenvalues is derived using complex moments obtained via numerical integration. Since the process to derive the moments can be performed in parallel and we do not need to exchange data between processes, the presented method is suitable for master-worker programming models. We have implemented and tested the proposed method in a grid RPC (remote procedure call) system. Numerical examples illustrate the properties of our approach. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

关键词： Eigenvalue problems moment-based method parallel algorithm

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