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numerical techniques Used in Modeling Codes for Dual-Reflector Antenna Design and Analysis

Journal of Systems Engineering and Electronics 1993年第2期4卷 63-74页

作者： Wang Welling, Wang Shijin and Chen JingxiongBeijing Institute of Radio Measurement, P. O. Box 3923, Beijing 100854, China Beijing Institute of Radio Measurement P. O. Box 3923 Beijing 100854 China

An user-oriented computer software consisting of three modeling codes, named DRAD, DRAA and FDPAT, is introduced. It can be used to design three types of Cassegrain system: classical, with shaped subreflector and with dual shaped reflectors, and to analyse radiation patterns for the antennas. Several mathematical models and numerical techniques are presented.

关键词： Software numerical technique Antenna Dual-reflector antenna Cassegrain system.

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Shape Effect of Nanoparticles on Nanofluid Flow Containing Gyrotactic Microorganisms

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Computer Modeling in Engineering & Sciences 2023年第1期134卷 483-494页

作者： Umair Rashid Azhar Iqbal Abdullah M.Alsharif School of Mathematical Sciences Jiangsu UniversityZhenjiang212013China Department of Mathematics and Natural Sciences Prince Mohammad Bin Fahd UniversityAl Khobar31952Saudi Arabia Department of Mathematics and Statistics College of ScienceTaif UniversityTaif21944Saudi Arabia

In this paper,we discussed the effect of nanoparticles shape on bioconvection nanofluid flow over the vertical cone in a permeable *** nanofluid contains water,Al2O3 nanoparticles with sphere(spherical)and lamina(non-spherical)shapes and motile *** phenomena of heat absorption/generation,Joule heating and thermal radiation with chemical reactions have been *** similarity transformations technique is used to transform a governing system of partial differential equations into ordinary differential *** numerical bvp4c MATLAB program is used to find the solution of ordinary differential *** interesting aspects of pertinent parameters on mass transfer,energy,concentration,and density of themotilemicroorganisms’profiles are computed and *** analysis depicts that the performance of sphere shape nanoparticles in the form of velocity distribution,temperature distribution,skin friction,Sherwood number and Motile density number is better than lamina(non-spherical)shapes nanoparticles.

关键词： Nanoparticle shape nanofluid numerical technique gyrotactic microorganisms magnetohydrodynamics

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Influence of Non-Uniform Temperature Distribution on Metallic Charge Length on Energy and Force Parameters During Groove-Rolling

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Journal of Iron and Steel Research(International) 2012年第8期19卷 17-24页

作者： Mróz Sebastian Czestochowa University of Technology

Change in the temperature of band over its length, associated with the stock being non-uniformly heated in the furnace, influences the variations in the magnitudes of energy-force parameters. Using the FEM (Finite Element Model) programs for the computation of the values of the energy-force parameters can take into account the distribution of temperature over the band length. The mathematical model of the computer program Forge2008 was used to theoretically examine the energy-force parameters and plastic metal flow in the roughing stands of the continuous rolling mill. The results of experimental investigation of influence of the non-uniform temperature distribution were presented on the metallic charge length on the energy and force parameters and dimensions of the band during round bars rolling. Thermovision monitoring energy and force parameters monitoring were carried out in continuous rolling mill D350 in one of the Polish industrial plants. On the basis of obtained results, it could be stated that non-uniform distribution of temperatures along the charge length causes local increase of energy and force parameters values and also such distribution affects the local increase of the width of rolled band. The rolling process of charge with non-uniform distribution of temperature could lead to exceeding required dimensional tolerances of the final products.

关键词： groove-rolling energy parameter force parameter numerical technique FEM

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A note on the equivalence of three major propagator algorithms for computational stability and efficiency

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Earthquake Science 2012年第1期25卷 55-64页

作者： Yanlu Ma Rongjiang Wang Huilan Zhou Institute for Geology Mineralogy and Geophysics Ruhr-University Bochum 44801 Germany China Earthquake Networks Center Beijing 100045 China GeoForschungsZentrum Potsdam （GFZ） Telegrafenberg D-14473 Potsdam Germany College of Earth Sciences Graduate University of Chinese Academy of Sciences Beijing 100049 China

It is shown in this note that the three methods, the orthonormalization method, the minor matrix method and the recursive reflection-transmission matrix method are closely related and solve the numerical instability in the original Thomson-Haskell propagator matrix method equally well. Another stable and efficient method based on the orthonormalization and the Langer block-diagonal decomposition is presented to calculate the response of a horizotttal stratified model to a plane, spectral wave. It is a numerically robust Thomson-Haskell matrix method for high frequencies, large layer thicknesses and horizontal slownesses. The technique is applied to calculate reflection-transmission coefficients, body wave receiver functions and Rayleigh wave dispersion.

关键词： elastic-wave theory layered media numerical technique Rayleigh wave seismic-wavepropagation

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