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Fast 3D EM scattering and radiation solvers based on MLFMA 被引量:2
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作者 Hu Jun Nie Zaiping Lei Lin Hu Jie Gong Xiaodong Zhao Huapeng 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2008年第2期252-258,共7页
As the fastest integral equation solver to date, the multilevel fast multipole algorithm (MLFMA) has been applied successfully to solve electromagnetic scattering and radiation from 3D electrically large objects. Bu... As the fastest integral equation solver to date, the multilevel fast multipole algorithm (MLFMA) has been applied successfully to solve electromagnetic scattering and radiation from 3D electrically large objects. But for very large-scale problems, the storage and CPU time required in MLFMA are still expensive. Fast 3D electromagnetic scattering and radiation solvers are introduced based on MLFMA. A brief review of MLFMA is first given. Then, four fast methods including higher-order MLFMA (HO-MLFMA), fast far field approximation combined with adaptive ray propagation MLFMA (FAFFA-ARP-MLFMA), local MLFMA and parallel MLFMA are introduced. Some typical numerical results demonstrate the efficiency of these fast methods. 展开更多
关键词 scattering and radiation multilevel fast multipole algorithm higher order far field approximation ray propagation local interaction parallel.
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Origin of hardening in spectra of cosmic ray nuclei at a few hundred GeV using AMS-02 data
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作者 Jia-Shu Niu 《Chinese Physics C》 SCIE CAS CSCD 2021年第4期25-32,共8页
Many experiments have confirmed spectral hardening at a few hundred GeV in the spectra of cosmic ray(CR)nuclei.Three different origins have been proposed:primary source acceleration,propagation,and the superposition o... Many experiments have confirmed spectral hardening at a few hundred GeV in the spectra of cosmic ray(CR)nuclei.Three different origins have been proposed:primary source acceleration,propagation,and the superposition of different kinds of sources.In this work,a broken power law has been employed to fit each of the spectra of cosmic ray nuclei from AMS-02 directly,for rigidities greater than 45 GeV.The fitting results of the break rigidity and the spectral index differences less than and greater than the break rigidity show complicated relationships among different nuclear species,which cannot be reproduced naturally by a simple primary source scenario or a propagation scenario.However,with a natural and simple assumption,the superposition of different kinds of sources could have the potential to explain the fitting results successfully.Spectra of CR nuclei from a single future experiment,such as DAMPE,will provide us the opportunity to do cross checks and reveal the properties of the different kinds of sources. 展开更多
关键词 cosmic ray propagation origin of cosmic ray cosmic ray composition and energy spectrum
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