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A Three Dimensional Gas-Kinetic Scheme with Moving Mesh for Low-Speed Viscous Flow Computations

Advances in applied mathematics and Mechanics 2010年第6期2卷 746-762页

作者： Changqiu Jin Kun Xu Songze Chen Institute of Applied Physics and Computational Mathematics Beijing 100088China Mathematics Department Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina College of Engineering Peking UniversityBeijing 100871China

The paper introduces the gas-kinetic scheme for three-dimensional(3D)flow ***,under a unified coordinate transformation,the 3D gaskinetic BGK equation is transformed into a computational space with arbitrary mesh moving ***,based on the Chapman-Enskog expansion of the kinetic equation,a local solution of gas distribution function is constructed and used in a finite volume *** a result,a Navier-Stokes flow solver is developed for the low speed flow computation with dynamical mesh *** test cases are used to validate the 3D gas-kinetic *** first example is a 3D cavity flow with up-moving boundary at Reynolds number 3200,where the periodic solutions are compared with the experimental ***,the flow evolution inside a rotating 3D cavity is simulated with the moving mesh method,where the solution differences between 2D and 3D simulation are explicitly ***,the scheme is applied to the falling plate study,where the unsteady plate tumbling motion inside water tank has been studied and compared with the experimental measurements.

关键词： Gas-Kinetic scheme moving mesh low-speed viscous flow freely moving body

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Longitudinal momentum distributions in single ionization of He by Ni24+ ions.

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PHYSICA SCRIPTA 1997年第0期T73卷 240-241页

作者： ORourke, SFC Crothers, DSF Theoretical and Computational Physics Research Division Department of Applied Mathematics and Theoretical Physics The Queen's University of Belfast Belfast BT7 1NN Northern Ireland

The longitudinal momentum distributions for the recoil ion and ejected electron in single ionization of He by 3.6 MeV/amu Ni24+ ions are presented using the continuum distorted-wave (CDW-CDW) model The results are discussed in the context of recent continuum distorted-wave eikonal-initial state (CDW-EIS) calculations [Rodriguez et al., J. Phys. B. 28, L471 (1995)] and compared with available experimental data.

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Biomedical data and AI

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Science China Life Sciences 2025年第5期68卷 1536-1540页

作者： Hao Xu Shibo Zhou Zefeng Zhu Vincenzo Vitelli Liangyi Chen Ziwei Dai Ning Yang Luhua Lai Shengyong Yang Sergey Ovchinnikov Zhuoran Qiao Sirui Liu Chen Song Jianfeng Pei Han Wen Jianfeng Feng Yaoyao Zhang Zhengwei Xie Yang-Yu Liu Zhiyuan Li Fulai Jin Hao Li Mohammad Lotfollahi Xuegong Zhang Ge Yang Shihua Zhang Ge Gao Pulin Li Qi Liu Jing-Dong Jackie Han Peking-Tsinghua Center for Life Sciences (CLS) Academy for Advanced Interdisciplinary StudiesPeking University Center for Quantitative Biology (CQB) Academy for Advanced Interdisciplinary StudiesPeking University Peking University-Tsinghua University-National Institute of Biological Sciences Joint Graduate Program Academy for Advanced Interdisciplinary StudiesPeking University Department of Physics University of Chicago School of Life Sciences Southern University of Science and Technology Peking University Chengdu Academy for Advanced Interdisciplinary Biotechnologies College of Chemistry and Molecular Engineering Peking University Department of Biotherapy Cancer Center and State Key Laboratory of BiotherapyWest China HospitalSichuan University Department of Biology Massachusetts Institute of Technology Lambic Therapeutics Inc. Changping Laboratory Al for Science Institute Key Laboratory of Computational Neuroscience and Brain-Inspired Intelligence Fudan University Department of Obstetrics and Gynecology West China Second University HospitalSichuan University Peking University International Cancer Institute and Peking University-Yunnan Baiyao International Medical Institute and State Key Laboratory of Natural and Biomimetic Drugs Department of Molecular and Cellular PharmacologySchool of Pharmaceutical SciencesPeking University Health Science CenterPeking University Channing Division of Network Medicine Department of MedicineBrigham and Women's Hospital and Harvard Medical School Center for Artificial Intelligence and Modeling the Carl R.Woese Institute for Genomic BiologyUniversity of Illinois Urbana-Champaign Department of Genetics and Genome Sciences School of Medicine and Department of Computer and Data Sciences and Department of Population and Quantitative Health SciencesCase Western Reserve University Department of Biochemistry and Biophysics University of California Sanger Institute Department of Automation Tsinghua University State Key Laboratory of Multimodal Artificial Intelligence Systems I

The development of artificial intelligence(AI) and the mining of biomedical data complement each other. From the direct use of computer vision results to analyze medical images for disease screening, to now integrating biological knowledge into models and even accelerating the development of new AI based on biological discoveries, the boundaries of both are constantly expanding, and their connections are becoming closer.

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First polar direct-drive exploding-pusher target experiments on the ShenGuang laser facility

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Chinese physics B 2019年第9期28卷 288-294页

作者： Bo Yu Jiamin Yang Tianxuan Huang Peng Wang Wanli Shang Xiumei Qiao Xuewei Deng Zhanwen Zhang Zifeng Song Qi Tang Xiaoshi Peng Jiabin Chen Yulong Li Wei Jiang Yudong Pu Ji Yan Zhongjing Chen Yunsong Dong Wudi Zheng Feng Wang Shaoen Jiang Yongkun Ding Jian Zheng Laser Fusion Research Center China Academy of Engineering PhysicsMianyang 621900China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Institute of Applied Physics and Computational Mathematics Beijing 100088China IFSA Collaborative Innovation Center Shanghai Jiao Tong UniversityShanghai 200240China

Low density and low convergence implosion occurs in the exploding-pusher target experiment, and generates neutrons isotropically to develop a high yield *** order to validate the performance of ShenGuang(SG) laser facility and test nuclear diagnostics, all 48-beam lasers with an on-target energy of 48 kJ were firstly used to drive room-temperature, DT gas-filled glass *** optimization has been carried out and optimal drive uniformity was obtained by the combination of beam repointing and *** final irradiation uniformity of less than 5% on polar direct-drive capsules of 540 μm in diameter was achieved, and the highest thermonuclear yield of the polar direct-drive DT fuel implosion at the SG was 1.04 × 10^(13).The experiment results show neutron yields severely depend on the irradiation uniformity and laser timing,and decrease with the increase of the diameter and fuel pressure of the *** thin CH ablator does not impact the implosion performance, but the laser drive uniformity is *** simulated results validate that the cos γ distribution laser design is reasonable and can achieve a symmetric pressure *** optimization will focus on measuring the symmetry of the hot spot by self-emission imaging, increasing the diameter, and decreasing the fuel pressure.

关键词： polar direct-drive exploding-pusher target neutron yield irradiation uniformity

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MULTISCALE FINITE ELEMENT METHOD FOR SUBDIVIDED PERIODIC ELASTIC STRUCTURES OF COMPOSITE MATERIALS

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Journal of computational mathematics 2001年第2期19卷 205-212页

作者： Li-qun Cao Jun-zhi Cui De-chao Zhu Jian-lan Luo Institute of Computational Mathematics and Science-Engineering Computing Academy of Mathematics and Systems SciencesChinese Academy of SciencesBeijing 100080China Solid Mechanics Research Center Beijing University of Aeronautics and AstronauticsBeijing 100083China Department of Applied Physics Beijing University of Aeronautics and AstronauticsBeijing 100083China

Deals with a study which discussed the mechanical behaviour for subdivided periodic elastic structures of composite materials, from the viewpoint of macro- and meso-scale coupling. Multiscale asymptotic expansion and truncation error estimates; Discussion on multiscale finite element method; Details of higher order difference quotients and total error estimates; Numerical experiments.

关键词： multi-scale asymptotic method finite element method composite medium

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Accurate prediction of interference minima in linear molecular harmonic spectra by a modified two-center model

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Chinese physics B 2016年第3期25卷 163-168页

作者：崔鑫张頔玉陈高陈基根曾思良郭福明杨玉军 Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy Jilin UniversityChangchun 130012China School of Science Changchun University of Science and TechnologyChangchun 130022China Department of Physics and Materials Engineering Taizhou UniversityTaizhou 318000China Institute of Applied Physics and Computational Mathematics Beijing 100088China

We demonstrate that the interference minima in the linear molecular harmonic spectra can be accurately predicted by a modified two-center model. Based on systematically investigating the interference minima in the linear molecular harmonic spectra by the strong-field approximation （SFA）, it is found that the locations of the harmonic minima are related not only to the nuclear distance between the two main atoms contributing to the harmonic generation, but also to the symmetry of the molecular orbital. Therefore, we modify the initial phase difference between the double wave sources in the two-center model, and predict the harmonic minimum positions consistent with those simulated by SFA.

关键词： high-order harmonic generation molecular harmonics

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Cascade of Random Rotation and Scaling in a Shell Model Intermittent Turbulence

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Communications in Theoretical physics 2006年第6X期46卷 1074-1080页

作者： SUN Peng CHEN Shi-Gang WANG Guang-Rui Graduate School of China Academy of Engineering Physics P.O. Box 2101 Beijing 100088 China Physics Department Anshan Normal College Anshan 1140057 China Institute of Applied Physics and Computational Mathematics P.O. Box 8009 (28) Beijing 100088 China

The time behaviors of intermittent turbulence in Gledzer-Ohkitani-Yamada model are investigated. Two kinds of orbits of each shell which is in the inertial range are discussed by portrait analysis in phase space. We find intermittent orbit parts wandering randomly and the directions of unstable quasi-periodic orbit parts of different shells form rotational, reversal and locked cascade of period three with shell number. We calculate the critical scaling of intermittent turbulence and the extended self-similarity of the two parts of orbit and point out that nonlinear scaling in inertial-range is decided by intermittent orbit parts.

关键词： intermittent orbit unstable quasi-periodic orbit critical scaling extended self-similarity （ESS）

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Bright Soliton Solutions in Degenerate Femi Gas near Feshbach Resonance

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Chinese physics Letters 2009年第12期26卷 39-41页

作者：刘红何岱海楼森岳贺贤土 Logistics School Beijing Wuzi University Beijing 101149 Department of Mathematics and Statistics McMaster University Hamilton Ontario L8S 4K1 Canada Department of Physics Ningbo University Ningbo 315211 Institute of Applied Physics and Computational Mathematics Beijing PO Box 8009 Beijing 100088

For molecular and standard Bose-Einstein condensates and Fermi gases near Feshbach resonances, the general polytropic equation of states is P∝n γ＋1. According to the effective power γ≈0.5~1.3, we resolve the time-dependent nonlinear Schrodinger equation and find series bright solitons. The analysis could help in the search for matter-wave soliton trains in degenerate Femi gas.

关键词： Atomic and molecular physics Quantum gases liquids and solids Statistical physics and nonlinear systems

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Recovery of frequency-sparse signals from compressive measurements

Recovery of frequency-sparse signals from compressive measur...

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48th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2010

作者： Duarte, Marco F. Baraniuk, Richard G. Program in Applied and Computational Mathematics Princeton University United States Department of Electrical and Computer Engineering Rice University United States

ISBN: (纸本)9781424482146

Compressive sensing (CS) is a new approach to simultaneous sensing and compression for sparse and compressible signals. While the discrete Fourier transform has been widely used for CS of frequency-sparse signals, it provides optimal sparse representations only for signals with components at integral frequencies. There exist redundant frames that provide compressible representations for frequency-sparse signals, but such frames are highly coherent and severely affect the performance of standard CS recovery. In this paper, we show that by modifying standard CS recovery algorithms to prevent coherent frame elements from being present in the signal estimate, it is possible to bypass the shortcomings introduced by the coherent frame. The resulting algorithm comes with theoretical guarantees and is shown to perform significantly better for frequency-sparse signal recovery than its standard counterparts. The algorithm can also be extended to similar settings that use coherent frames. ©2010 IEEE.

关键词： Compressed sensing

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Nucleation-initiated solidification of thin Si films

Nucleation-initiated solidification of thin Si films

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2006 MRS Fall Meeting

作者： Hazair, S. Van Der Wilt, P.C. Deng, Y. Chung, U.-J. Limanov, A.B. Im, James S. Program of Materials Science Department of Applied Physics and Applied Mathematics Columbia University New York NY 10027 United States

ISBN: (纸本)9781604234282

Thin Si films on SiO2 that are completely melted by pulsed laser irradiation cool rapidly and eventually solidify via nucleation and growth of solids. It has been observed that a variety of solidified microstructures can be obtained, depending primarily (but not exclusively) on the degree of supercooling achieved prior to the onset of nucleation. This paper focuses on investigating one particular and unusual polycrystalline microstructure that consists of "flower-like" grains, the interiors of which can be described as being made up of two distinct regions: (1) an extremely defective core region consisting of fine-grained material, and (2) an outer region consisting of relatively defect-free crystal "petals" that radiate outwards. After considering the microstructural details and experimental behavior of the microstructure, we have formulated a growth-based physical model to account for the formation of the microstructure. The model is found to be also capable of accounting for other complex and unusual microstructures obtained via nucleation and growth in the complete melting regime. © 2007 Materials Research Society.

关键词： Thin films

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