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Investigations of Microwave Absorption in Insulating Dielectric Ionic Crystals Including the Role of Point Defects and Dislocations

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MRS Online Proceedings Library 1996年第1期430卷 397-402页

作者： Benjamin D.B. Klein Binshen Meng Samuel A. Freeman John H. Booske Reid F. Cooper Department of Electrical and Computer Engineering University of Wisconsin Madison USA Materials Science Program University of Wisconsin Madison USA Department of Materials Science and Engineering University of Wisconsin Madison USA

A theoretical model of microwave absorption in linear dielectric (non-ferroelectric) ionic crystals that takes into account the presence of point defects was synthesized and verified using NaCl single crystals. In the next stage of this research, we will introduce a controlled density of dislocations into the single crystal NaCl samples and study the effect on the microwave absorption mechanisms (ionic conduction, dielectric relaxation and multi-phonon processes) both theoretically and experimentally. Qualitative outlines of this modified theory are presented. The loss factor ε’ has been measured in the dislocation-free case by a cavity resonator insertion technique and the experimental results are in good agreement with the theoretical model. We describe the sample preparation technique that will be used to produce a controlled dislocation density in single crystal samples that will also be studied in our cavity resonator insertion system.

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A performance model of space-division ATM switches with input and output queueing 29

A performance model of space-division ATM switches with inpu...

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29th Hawaii International Conference on System sciences, HICSS 1996

作者： Zhang, Guogen Bulgren, William G. Wallace, Victor L. Computer Science Department University of California at Los Angeles Los AngelesCA90024 United States Engineering Management Program University of Kansas LawrenceKS66045 United States Department of Electrical Engineering University of Kansas LawrenceKS66045 United States

ISBN: (纸本)0818673249

An analytic model for the performance evaluation of space-division Asynchronous Transfer Mode (ATM) switches is presented. This model assumes that the switch has a fixed capacity of m, where 12 is given. The result shows that the performance of switches with a small capacity can approach that of output queueing. The model and result can be used for switch design analysis and higher layer performance models. © 1996 IEEE

关键词： Asynchronous transfer mode

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The concept of fuzzy multimedia intelligent communication system (FuMICS)

The concept of fuzzy multimedia intelligent communication sy...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Y. Nakagawa E. Hirota W. Pedrycz Department of Systems Science Interdisciplinary Graduate School of Science and Engineering Tokyo Institute of Technology Yokohama Japan Department of Electrical and Computer Engineering University of Manitoba Winnipeg MAN Canada

A fuzzy multimedia intelligent communication system (FuMICS), that introduces the advantages of the communication of conventional computer and human being and the communication of human being and human being, is proposed from the viewpoint of human friendly communication using the multimedia devices. It is a human friendly communication interface and is able to handle fuzzy information in the fuzzy knowledge base where the multimedia information is integrated. The basic design concept of FuMICS and its application perspective are described toward the realization of intelligent everywhere everybody everytime computing (IEEE computing).

关键词： Fuzzy systems Multimedia communication Multimedia systems Intelligent systems Humans computer interfaces Transmitters Microcomputers Tellurium computer languages

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Statistical Comparative Analyses of engineering Properties of Microwave and Conventionally Sintered Alumina

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MRS Online Proceedings Library 1996年第1期430卷 453-458页

作者： K.R. Binger S.A. Freeman D.J. Grellinger R.F. Cooper J.H. Booske Department of Electrical and Computer Engineering University of Wisconsin - Madison Madison USA Material Science Program University of Wisconsin - Madison Madison USA Department of Material Science and Engineering University of Wisconsin - Madison Madison USA

Processing conditions such as temperature, soak time, and heating rate affect the final density of conventionally-sintered and microwave-sintered ceramics. Of additional importance is the question of whether microwave-sintered ceramics display intrinsically superior macroscopic engineering properties compared with conventionally-sintered control specimens. An analysis using the Yates algorithm indicates that the processing condition which has the largest impact on the density of the specimen is the heating method (microwave vs. conventional). The microwave-sintered specimens resulted in higher densities and higher fracture strengths. However, it was determined that the higher fracture strengths were due to the higher sintered densities rather than a significantly different microstructure.

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Body surface Laplacian mapping from potential recordings in man

Body surface Laplacian mapping from potential recordings in ...

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Southern Biomedical engineering Conference

作者： N. Mehdi X. Yu D. Wu N. Jojic B. Baker P. Gosavi A. Seyd S. Bodak K. Umetani B. He Bioengineering Program University of Illinois Chicago USA Department of Electrical Engineering and Computer Science University of Illinois Chicago USA

Body surface Laplacian maps were studied from a set of unipolar potential data in healthy human subjects. The present results indicate that body surface Laplacian maps can be obtained with high reproducibility in the human subjects studied, and can reveal detailed information regarding the underlying ventricular conduction process.

关键词： Laplace equations Helium Humans Electrodes Electrocardiography Bioelectric phenomena Biomedical engineering Electric potential Board of Directors Reproducibility of results

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Development of a X-window based bioelectric mapping software system

Development of a X-window based bioelectric mapping software...

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Southern Biomedical engineering Conference

作者： X. Yu D. Wu B. He Department of Electrical Engineering and Computer Science University of Illinois Chicago USA Bioengineering Program University of Illinois Chicago USA

The authors have developed a multi-purpose X-window based mapping software system. This software system can be used to analyze and display body surface maps of the Laplacian electrocardiogram, potential electrocardiog... 详细信息

关键词： Bioelectric phenomena Software systems Laplace equations Electric potential Humans Electrocardiography Helium Data analysis Heart Signal processing

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A performance model of space-division ATM switches with input and output queueing

A performance model of space-division ATM switches with inpu...

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Annual Hawaii International Conference on System sciences (HICSS)

作者： Guogen Zhang W.G. Bulgren V.L. Wallace Computer Science Department University of California Los Angeles Los Angeles CA USA Engineering Management Program University of Kansas Lawrence KS USA Department of Electrical Engineering and Computer Science University of Kansas Lawrence KS USA

An analytic model for the performance evaluation of space-division asynchronous transfer mode (ATM) switches is presented. This model assumes that the switch has a fixed capacity of m, where 1/spl les/m/spl les/N (N is the number of trunks). Other important parameters include arrival rate and buffer sizes. Numerical solutions for the maximum throughput, cell delay, and cell loss probability are given with simulation being utilized in order to validate the analytic model. For independent and identical Bernoulli arrivals, the study shows that the contention processes can be modeled as discrete M/D/m (FIFO or Random) queues, while input queues can be modeled by Geom/G/1 queues, and the output queues are G/sup [X]//D/1 queues. A closed-form approximation for cell delay when m>2 is given. The result shows that the performance of switches with a small capacity can approach that of output queueing. The model and result can be used for switch design analysis and higher layer performance models.

关键词： Asynchronous transfer mode Switches Performance analysis Fabrics Communication switching Queueing analysis Throughput Delay computer science Performance loss

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A nonstationary analysis of bandwidth access control schemes for heterogeneous traffic in B-ISDN

A nonstationary analysis of bandwidth access control schemes...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： Yi Qian D. Tipper D. Medhi Department of Electrical and Computer Engineering Clemson University Clemson SC USA Telecommunications Program Department of Information Science University of Pittsburgh Pittsburgh PA USA Department of Computer Networking University of Missouri Kansas City Kansas City MO USA

We present a comparative analysis of bandwidth access control schemes under nonstationary traffic conditions for heterogeneous circuit-mode traffic offered to a B-ISDN network link. A unified model for analysing the behavior of several bandwidth access control schemes is developed using a Markov process model with acceptance functions. Numerical techniques are used to solve the associated Chapman-Kolmogorov equations and determine the nonstationary behavior. Performance results are given for several common bandwidth access control schemes, namely: complete sharing, complete partitioning, partial sharing, classical trunk reservation, and the probabilistic reservation policy. It is shown that the use of the average arrival rate to estimate the average connection blocking rate may be an underestimate for a system with a time varying arrival process. Also, it is found that a nonstationarity in one traffic class arrival process can impact other stationary traffic classes and the degree of variability depends on the particular access control scheme.

关键词： Bandwidth Access control B-ISDN Traffic control Communication system traffic control Circuits Queueing analysis Markov processes Information analysis Cities and towns

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Experimental observation of Coulomb staircase in asymmetric tunnel barrier system

Experimental observation of Coulomb staircase in asymmetric ...

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International Electron Devices Meeting (IEDM)

作者： Y. Matsumoto T. Hanajiri T. Toyabe T. Sugano Department of Electrical and Electronics Engineering Toyo University Kawagoe Saitama Japan Department of Information and Computer Science Toyo University Kawagoe Saitama Japan Frontier Research Program RIKEN Institute of Physical and Chemical Research Wako Saitama Japan

The advantages of single electron devices with asymmetrical tunnel barriers (ATBs), proposed by the authors, over conventional single electron devices with symmetrical tunnel barriers (STBs) are discussed by referring to the features of ATBs and the results of computer simulation of the performance of tunnel-junction-load SET logic and turnstile devices. Experimental observation of a Coulomb staircase and asymmetrical tunnel characteristics in ATBs fabricated with GaAs/AlGaAs heterostructures are also reported.

关键词： Single electron devices Temperature Circuits US Department of Transportation Tunneling Thermal resistance Capacitance computer science Chemical engineering computer simulation

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Room-temperature performance of double-fused 1.54 /spl mu/m vertical-cavity laser

Room-temperature performance of double-fused 1.54 /spl mu/m ...

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Indium Phosphide and Related Materials Conference

作者： D.I. Babic K. Streubel R.P. Mirin J. Piprek N.M. Margalit J.E. Bower E.L. Hu D.E. Mars L. Yang K. Carey Department of Electrical and Computer Engineering University of California Santa Barbara USA Department of Electronics Royal Institute of Technology Stockholm Sweden Materials Science Program University of Delaware Newark USA Hewlett Packard Laboratories Palo Alto CA USA

The progress in understanding wafer-fused vertical-cavity lasers and improvements in fabrication techniques have led to the realization of the first room-temperature continuous-wave operating 1.54-/spl mu/m vertical-cavity lasers. By demonstrating continuous-wave operation at room temperature using vertical-cavity lasers fabricated by two wafer fusion steps, we have shown that wafer fusion is a viable technique. The lasers comprise strain compensated InGaAsP quantum-well active layers sandwiched between two AlGaAs/GaAs quarter-wave mirrors. Characteristics discussed include cavity losses, the gain-current density relationship, and voltage-current characteristics.

关键词： Vertical cavity surface emitting lasers Mirrors Optical pulse generation Absorption Pulse measurements Quantum well lasers Doping Temperature Propagation losses Size measurement

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