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ECOLOGICAL MODELLING 2006年第3-4期192卷 586-600页

作者： Latham, LG Univ Med Prod USA Inc Irvine CA 92606 USA

Network flow analysis relies on mathematical techniques to gain knowledge about network structure in real and theoretical systems. From a two-dimensional representation of the flow of material, energy, or information in a network, indices and matrices provide non-obvious knowledge about the system. Where the indices and matrices are described in the literature, researchers rarely find an algorithm or computer code example to facilitate the inclusion of the technique into their projects. Researchers are forced to code the algorithms from scratch, which can be difficult, or obtain them from other investigators, which is time-consuming. In this paper, I describe the most popular network flow analysis indices and matrices with reference to relevant citations and supply algorithms and free software for their calculation. I also propose that researchers adopt a consistent set of primary symbolic letter designations for the indices and matrices. (c) 2005 Elsevier B.V. All rights reserved.

关键词： network analysis computer algorithm

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DIGITAL-SIMULATION OF B/H EXCURSIONS FOR POWER-SYSTEM STUDIES

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IEE PROCEEDINGS-C GENERATION TRANSMISSION AND DISTRIBUTION 1988年第3期135卷 202-209页

作者： RAY, S Department of Electrical Engineering College of Technology Govind Ballabh Pant University of Agriculture and Technology Pantnagar India

Many power system circuits contain iron cored coils, which are common nonlinear circuit elements. Systems engineers have to model these elements while studying such phenomena as inrush current, ferroresonance, subharmonics etc. The nonlinearity involved in these elements cannot be appropriately taken into account unless due regard is given to the damping effects on account of hysteresis. This paper attempts to simulate digitally the appropriate paths of B/H excursions in a piecewise linear manner when the magnetic core is subjected to random variations of magnetic field intensity and sets up a computer algorithm. The algorithm may be used in digital analysis of systems containing iron cored coils.

关键词： magnetic hysteresis random variations iron cored coils Power engineering computing magnetic core Magnetic cores magnetic field intensity damping effects power system studies inrush current Power systems magnetic cores power system analysis computing computer algorithm nonlinear circuit elements nonlinear network analysis damping subharmonics ferroresonance B/H excursions digital simulation

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ANALYTICAL AND EXPERIMENTAL-STUDY OF VIBRATING RECTANGULAR-PLATES ON RIGID POINT SUPPORTS

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AIAA JOURNAL 1991年第5期29卷 838-844页

作者： GORMAN, DJ SINGAL, RK CANADIAN SPACE AGCY DIRECTORATE SPACE MECHOTTAWA K2H 852ONTARIOCANADA

An analytical-type solution based on the superposition method is developed for the free-vibration frequencies and mode shapes of rectangular plates resting on arbitrarily located rigid point supports. The supports are of the type realized by means of bolts or spot welds. An extensive experimental program was conducted in support of the project, and excellent agreement between computed and experimental results was obtained. While the analysis is general in nature, it will be highly applicable to the study of vibration of electronic circuit boards and solar panels.

关键词： Resonant Frequencies Electronic Circuits Bending Moment Aspect Ratio computer algorithm Poisson's Ratio Frequency Response Functions Flexural Rigidity Accelerometer Fatigue Life

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Alignment and initial operation of an advanced solar simulator

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JOURNAL OF SPACECRAFT AND ROCKETS 1996年第6期33卷 867-869页

作者： Jaworske, DA Jefferies, KS Mason, LS NASA Lewis Research Center Cleveland Ohio 44135

A solar simulator utilizing nine 30-kW xenon ape lamps was built to provide radiant power for testing a solar dynamic space power system in a thermal vacuum environment. The advanced solar simulator achieved the following values specific to the solar dynamic system: 1) a subtense angle of 1 deg;2) the ability to vary solar simulator intensity up to 1.7 kW/m(2);3) a beam diameter of 4.8 m;and 4) uniformity of illumination on the order of +/-10%. The flexibility of the solar simulator design allows for other potential uses of the facility.

关键词： Solar Simulator Power System Photodiodes Radiant Energy Thermal Energy Storage Eclipses Jet Propulsion Laboratory Electric Power Statistical Analysis computer algorithm

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Minimax D-optimal designs for the logistic model

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BIOMETRICS 2000年第4期56卷 1263-1267页

作者： King, J Wong, WK Univ Calif Los Angeles Dept Biostat Los Angeles CA 90095 USA

We propose an algorithm for constructing minimax D-optimal designs for the logistic model when only the ranges of the values for both parameters are assumed known. Properties of these designs are studied and compared with optimal Bayesian designs and Sitter's (1992, Biometrics, 48, 1145-1155) minimax D-optimal kk-designs. Examples of minimax D-optimal designs are presented for the logistic and power logistic models, including a dose-response design for rheumatoid arthritis patients.

关键词： approximate designs computer algorithm D-optimality efficiency information matrix power logistic model

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Optimizing subcritical-flow thrust-vectoring of converging-diverging nozzles

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JOURNAL OF PROPULSION AND POWER 2000年第2期16卷 202-206页

作者： Wilson, EA Adler, D Bal-Or, BZ Sherbaum, V Lichtsinder, M Technion Israel Inst Technol Turbomachinery Lab IL-32000 Haifa Israel Technion Israel Inst Technol Jet Engine Lab IL-32000 Haifa Israel

Engine thrust vectoring (TV) is a potential technology for military and future civil aircraft in which the Technion-Israel Institute of Technology has made significant contributions. This paper provides realistic predictions of steady-state engine performance during steady-state pitch vectoring. The results obtained comprise a required fundamental step for advanced aircraft/TV implementation. This work is a part of the Lockheed Martin yaw-pitch TV F-16/F-100 research study conducted here at the Jet Laboratory. To this end, a unique TV-engine computer algorithm has been developed that expands the conventional steady-state modeling capabilities of on- and off-design as well as the conventional transients (via throttle changes) to create steady-state and dynamic TV-engine simulations at various altitudes and Mach numbers. This paper reviews the steady state performances and the optimization observations initially obtained. The subcritical flow realm of nozzle performance provides trends aiding in the prediction of thrust benefits beyond the conventional nozzle design of the F100 model are available as the effective nozzle throat area is allowed to contract through vectoring.

关键词： Thrust Vectoring Convergent Divergent Nozzles Yaw Civil Aircraft Subcritical Flow Thermodynamic Engine computer algorithm Mach Numbers MiG 29 Angle of Attack

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ACCELERATED SUBSPACE ITERATION FOR EIGENVECTOR DERIVATIVES

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AIAA JOURNAL 1992年第8期30卷 2114-2118页

作者： TING, T University of Bridgeport Bridgeport Connecticut 06601

An accelerated subspace iteration method for calculating eigenvector derivatives has been developed. Factors affecting the effectiveness and the reliability of the subspace iteration are identified, and effective strategies concerning these factors are presented. The method has been implemented and the results of a demonstration problem are presented.

关键词： Eigenvector Finite Element Modeling Numerical Stability Computing Structural Dynamics Turbine Blades Structural Optimization computer algorithm Structural System Nastran

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OPTIMUM OPTICAL MODULATION INDEX OF LASER TRANSMITTERS IN SCM SYSTEMS

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ELECTRONICS LETTERS 1990年第16期26卷 1273-1275页

作者： ALAMEH, K MINASIAN, RA Sch. of Electr. Eng. Sydney Univ. NSW Australia

An analysis of the optimum optical modulation index of laser transmitters in SCM systems is presented. Nonlinear distortion arising from overmodulation in a laser-limiter combination is studied. A generalised analysis, based on rectangular signal input power spectral density and broadband transmission, is given for the nonlinear noise spectral density. A computer algorithm is developed to generate the optimum modulation index which maximises the received CNR for SCM transmission.

关键词： SCM systems SCM transmission broadband transmission carrier noise ratio computer algorithm generalised analysis laser transmitters laser-limiter combination multiplexing nonlinear noise spectral density optical communication optical fibres optimum optical modulation index overmodulation passive optical network received CNR maximisation rectangular signal input power spectral density subcarrier multiplexing

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INPUT IMPEDANCE OF ARBITRARILY SHAPED MICROSTRIP ANTENNAS

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ELECTRONICS LETTERS 1988年第19期24卷 1214-1215页

作者： PICHON, P MOSIG, J PAPIERNIK, A ECOLE POLYTECH FED LAUSANNE ELECTROMAGNET LABCH-1015 LAUSANNESWITZERLAND UNIV NICE CNRSELECTR LABGRECO MICROANTENNESF-06034 NICEFRANCE

Deals with the analysis of arbitrarily shaped microstrip antennas. A powerful and flexible technique is obtained by combining a mixed potential integral equation, successfully used for rectangular patches, with a method of moments, using a division of the patch into triangular cells and overlapping basis functions, defined over cell couples. The resulting computer algorithm is validated by comparing its predictions with the measurements obtained from an equilateral triangular patch

关键词： antenna radiation patterns arbitrarily shaped microstrip antennas cell couples computer algorithm equilateral triangular patch method of moments mixed potential integral equation overlapping basis functions rectangular patches strip line components triangular cells waveguide antennas

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Two level scheme solvers for nuclear spectroscopy

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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 2011年第1期654卷 496-501页

作者： Jansson, Kaj DiJulio, Douglas Cederkall, Joakim Lund Univ Dept Phys S-22100 Lund Sweden

A program for building level schemes from gamma-spectroscopy coincidence data has been developed. The scheme builder was equipped with two different algorithms: a statistical one based on the Metropolis method and a more logical one, called REMP (REcurse, Merge and Permute), developed from scratch. These two methods are compared both on ideal cases and on experimental gamma-ray data sets. The REMP algorithm is based on coincidences and transition energies. Using correct and complete coincidence data, it has solved approximately half a million schemes without failures. Also, for incomplete data and data with minor errors, the algorithm produces consistent sub-schemes when it is not possible to obtain a complete scheme from the provided data. (C) 2011 Elsevier B.V. All rights reserved.

关键词： Coincidence matrix computer algorithm Level scheme solver Nuclear gamma-ray spectroscopy

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