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IEEE Photonics Conference (IPC)

作者： M. Sugimoto T. Nuinai I. Ogura H. Kosaka K. Kasahara Optoelectronics Research Laboratories NEC Corporation Limited Tsukuba Ibaraki Japan

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Advanced Multi-media Information Distribution System

Advanced Multi-media Information Distribution System

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MILCOM, Military Communications Conference

作者： D.E. Krzysiak Rome Air Dev. Center Griffiss AFB NY USA

A description is given of the Advanced Multimedia Information Distribution System (AMIDS), which will provide high-capacity, secure, low-probability-of-detection/intercept (LPD/LPI), and interoperable communications technologies and services for distributed/dispersed systems. The AMIDS program is also developing communications services that allow dispersed personnel to communicate with each other as if they were located in the same room. The system is intended for future US Air Force command and control.< >

关键词： Multimedia systems Decoding Hardware Circuit simulation Differential quadrature phase shift keying Dynamic range Viterbi algorithm Printed circuits Software performance density estimation robust algorithm

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Chaos via torus breakdown in the forced van der Pol oscillator

Chaos via torus breakdown in the forced van der Pol oscillat...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： N. Inaba Department of Information Science Utsunomiya University Utsunomiya Japan

Chaos in the forced van der Pol oscillator including a pair of diodes is investigated. First, the authors show that the normal forced van der Pol equation exhibits chaos. The generation of chaos is explained by a Lorenz plot. Secondly, they analyze chaos rigorously by using a piecewise-linear technique and a degeneration technique which corresponds to an idealized case where the diode is assumed to operate as an ideal switch. In this case, the Poincare map is derived strictly as one-dimensional mapping which is a noninvertible return mapping of a circle. This mapping clarifies the mechanism of chaos.< >

关键词： Chaos Electric breakdown density estimation robust algorithm Equations Diodes Circuits Piecewise linear techniques Switches Voltage-controlled oscillators Piecewise linear approximation

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POTENTIAL AND ELECTRON-DISTRIBUTION MODEL FOR THE BURIED-CHANNEL MOSFET

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IEEE TRANSACTIONS ON ELECTRON DEVICES 1989年第4期36卷 670-689页

作者： VANDERTOL, MJ CHAMBERLAIN, SG Department of Electrical Engineering University of Waterloo Waterloo ONT Canada

The authors present a novel analytic model for the potential and electron distribution in the channel-depth direction for the buried-channel (BC) MOSFET (metal-oxide-semiconductor field-effect transistor). The purpose of the model is to aid in the fundamental physical understanding of the operational modes of the BC-MOSFET and the mechanisms affecting these modes. Using Poisson's equation, individual analytic expressions are formulated to predict the potential distribution and electron concentration profile under conditions of depletion, inversion, pinchoff, and accumulation as a function of the gate bias, substrate bias, and applied channel potential. While the potential distribution in the channel-depth direction enables the band-bending within the device to be visualized, the signal electron concentration profile leads to an easy physical interpretation of the modes of operation and the location of mobile charge relative to the channel surface: this is important for mobility and device speed considerations. In addition, the model can be used for device design.< >

关键词： MOSFET circuits Implants density estimation robust algorithm Doping Inverters Scholarships Poisson equations Visualization Electron mobility Semiconductor process modeling

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MEASUREMENT OF TOWED ARRAY POSITION, SHAPE, AND ATTITUDE

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IEEE JOURNAL OF OCEANIC ENGINEERING 1989年第4期14卷 375-381页

作者： VANBALLEGOOIJEN, EC VANMIERLO, GWM VANSCHOONEVELD, C VANDERZALM, PPM PARSONS, AT FIELD, NH TNO DIV TECH DEVINFORMAT & COMMUN GRPTHE HAGUENETHERLANDS ADMIRAL RES ESTAB PORTLAND DT5 2JSDORSETENGLAND

A practical method is described for the three-dimensional determination of the position, shape, and attitude of a hydrophone array towed from a surface vessel. It provides successive snapshots of the array configuration with a maximum rate of about three per minute. The method is intended as an alternative to the use of fixed test ranges and provides results suitable for validating computer models of array motion. It uses the travel-time differences of impulsive waves measured across the array. The waves are generated by two explosive charges dropped from consorts. Results of a typical experiment are presented as an illustrative example. The array position relative to the tow ship is obtained to within an accuracy of a few metres.< >

关键词： Shape measurement Position measurement Sensor arrays Sonar equipment Marine vehicles Testing Acoustic sensors Degradation Sea measurements density estimation robust algorithm

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A RESISTANCE RATIO BRIDGE BASED ON A CRYOGENIC CURRENT COMPARATOR FOR MEASURING THE QUANTIZED HALL RESISTANCE

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 1989年第1期38卷 54-58页

作者： VANDERWEL, W MOOIJ, JE HARMANS, CJPM ANDRE, JP WEIMANN, G PLOOG, K FOXON, CT HARRIS, JJ VAN SWINDEN LAB 2600 AR DELFTNETHERLANDS FORSCHUNGSINST DEUTSCH BUNDESPOST D-6100 DARMSTADTFED REP GER PHILIPS RES LABS REDHILL RH1 5HASURREYENGLAND LABS ELECTR & PHYS APPL F-94450 LIMEIL BREVANNESFRANCE MAX PLANCK INST FESTKORPERFORSCH D-7000 STUTTGART 80FED REP GER

A description is given of a resistance bridge based on a cryogenic current comparator covering a range of 1-12 906 Omega . Type-B ('systematic') uncertainty contributions are carefully evaluated and are less than 0.004 p.p.m. (1 sigma ). Type-A or random contributions are 0.006 p.p.m. ( sigma , 20 min.) in a transfer of the quantized Hall resistance R/sub H/ (i=2) to 100 Omega . Measurements relating h/2e/sup 2/ to Omega /sub VSI/ maintained by the Van Swinden Laboratory are presented, showing agreement to 0.09 p.p.m. with the results of other national standards institutes.< >

关键词： Bridges Cryogenics Current measurement Electrical resistance measurement Laboratories Resistors Circuits density estimation robust algorithm Q measurement Optical filters

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Bifurcation phenomena and chaotic oscillations in a system described by the Duffing-Van der Pol's equation

Bifurcation phenomena and chaotic oscillations in a system d...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： K. Yamaguchi H. Shibayama Faculty of Engineering Osaka Institute of Technology Osaka Japan

Bifurcation of periodic oscillations and chaotic states in a system described by the Duffing-van der Pol's equation are considered. Bifurcation sets of periodic solutions are calculated using digital computers. The structure of invariant curves in the harmonic entrained region is studied. The strange attractor and the strange repeller obtained in the system are given. Correlations between chaotic oscillations and unstable periodic points are considered.< >

关键词： Bifurcation Chaos density estimation robust algorithm Nonlinear equations Steady-state Periodic structures Oscillators Frequency

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Status And Research Objectives Of The Dutch Free Electron Laser For Infrared Experiments

Status And Research Objectives Of The Dutch Free Electron La...

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Proceedings of the International Free Electron Laser Conference

作者： P.W. Van Amersfoort R.W.B. Best R. Van Buuren P.F.M. Delmee B. Faatz C.A.J. Van Der Geer D.A. Jaroszynski P. Manintveld W.J. Mastop B.J.H. Meddens A.F.G. Van Der Meer D. Oepts J. Pluygers M.J. Van Der Wiel FOM-Instituut uoor Plasmafysica Rijnhuizen Association Euratom-FOM Netherlands FOM-Instituut uoor Plasmafysica Rijnhuizen Association Euratom-FOM Nieuwegein Netherlands

We review the status and research objectives of the free electron laser for infrared experiments (FELIX), which will be operated as a users facility for the far-infrared and submillimeter spectral regions. The spectra... 详细信息

关键词： Free electron lasers Undulators density estimation robust algorithm Infrared spectra Structural beams Optical pulses Frequency Electron beams Plasmas Tunable circuits and devices

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Reliability of uninterruptible power supply systems

Reliability of uninterruptible power supply systems

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International Conference on Telecommunications Energy (INTELEC)

作者： F. Schneider Fernmelde Technisches Zentralamt der Deutschen Bundespost Darmstadt Germany

After discussing basic ideas concerning the reliability of UPS (uninterruptible power supply) systems, the authors present reliability parameters and formulae, reliability formulae for down-times of short mains, reliability formulae for down-times for long mains, and reliability formulae for the entire power supply system. To give an idea of the reliability values that can be reached in uninterruptible power supply systems and of the factors by which these values are affected, a number of examples are calculated by means of the derived formulae.< >

关键词： Power system reliability Uninterruptible power systems Batteries Power supplies Availability Switches density estimation robust algorithm Feeds Control systems Power grids

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A 14-NS 1-MBIT CMOS SRAM WITH VARIABLE BIT ORGANIZATION

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IEEE JOURNAL OF SOLID-STATE CIRCUITS 1988年第5期23卷 1060-1066页

作者： KOHNO, Y WADA, T ANAMI, K KAWAI, Y YUZURIHA, K MATSUKAWA, T KAYANO, S LSI Research and Development Laboratory Mitsubishi Electric Corporation Limited Itami Hyogo Japan

The authors describe a 14-ns 1-Mb CMOS SRAM (static random-access memory) with both 1M word*1-b and 256 K word*4-b organizations. The desired organization is selected by forcing the state of an external pin. The fast access time is achieved by the use of a shorter divided-word-line (DWL) structure, a highly sensitive sense amplifier, a gate-controlled data-bus driver, and a dual-level precharging technique. The 0.7- mu m double-aluminum and triple-polysilicon process technology with trench isolation offers a memory cell size of 41.6 mu m/sup 2/ and a chip size of 86.6 mm/sup 2/. The variable bit-organization function reduces the testing time while keeping the measurement accuracy of the access times.< >

关键词： Random access memory Decoding Capacitance Read-write memory Pulse generation density estimation robust algorithm Circuit synthesis Signal detection Clocks Operational amplifiers

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