检索结果-南通市图书馆

A Canonical Decomposition of the Right Invertible System and All Solutions of the Regular Row-By-Row Decoupling Problem

在线全文

学校读者我要写书评

暂无评论

A Canonical Decomposition of the Right Invertible System and...

CORRECTION METHODS FOR STEADY INCOMPRESSIBLE FLOWS

第三十届中国控制会议

作者： WEI Musheng~1,SHEN Dongmei~(1,2) 1.College of Mathematics and Science,shanghai Normal University,scientific computing key laboratory of shanghai universities shanghai 200234,P.R.China 2.School of Science,Nantong University,Nantong,Jiangsu 226007,P.R.China

＜正＞In this paper,we describe a canonical decomposition of a right invertible system {C,A,B}.By this decomposition, we study all solutions of the regular row-by-row decoupling problem and the regular row-by-row deco... 详细信息

关键词： Right invertible system Canonical decomposition Regular row-by-row decoupling Stability

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1999年第4期17卷 419-424页

作者： Jian Li(State key laboratory of scientific and Engineering computing, ICMSEC, Chinese Academy of Sciences, Beijing 100080, China) 中科院计算数学与科学工程计算所科学与工程计算国家重点实验室北京

Correction methods for the steady semi-periodic motion of incompressible fluid are investigated. The idea is similar to the influence matrix to solve the lack of vorticity boundary conditions. For any given boundary condition of the vorticity, the coupled vorticity-stream function formulation is solved. Then solve the governing equations with the correction boundary conditions to improve the solution. These equations are numerically solved by Fourier series truncation and finite difference method. The two numerical techniques are employed to treat the non-linear terms. The first method for small Reynolds number R equals 0-50 has the same results as that in M. Anwar and S.C.R. Dennis' report. The second one for R greater than 50 obtains the reliable results. (Author abstract) 4 Refs.

关键词： incompressible flow vorticity stream function numerical solution

THE OVERLAPPING DOMAIN DECOMPOSITION METHODFOR HARMONIC EQUATION OVER EXTERIORTHREE-DIMENSIONAL DOMAIN

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2000年第1期18卷 83-94页

作者： Ji-ining Wu De-bao Yu(State key laboratory of scientific and Engineering computing, Institute of ComputationalMathematics and scientific/Engineering computing, Chinese Academy of Sciences, Beijing100080, China) 中科院计算数学与科学工程计算所科学与工程计算国家重点实验室北京 100080

Presents a study which applied the overlapping domain decomposition method based on the natural boundary reduction to solve the boundary value problem of harmonic equation over domain. Methods to solve boundary value ... 详细信息

关键词： DDM exterior harmonic problem natural boundary reduction

NONCONFORMING FINITE ELEMENT APPROXIMATIONS TO THE UNILATERAL PROBLEM

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1999年第1期17卷 15-24页

作者： Lie-heng Wang(State key laboratory of scientific and Engeneering computing, ICMSEC,Chinese Academy of Sciences, Beijing 100080, China) Chinese Acad Sci State Key Lab Sci & Engn Comp ICMSEC Beijing 100080 Peoples R China

The nonconforming finite element (two Crouzeix-Raviart linear elements and Wilson element) approximations to the unilateral problem are considered. The error bounds for these elements are obtained in the appropriate a... 详细信息

关键词： unilateral problem nonconforming finite element

EXPERIMENTAL STUDY OF THE ASYNCHRONOUS MULTISPLITTING RELAXATION METHODS FOR THE LINEAR COMPLEMENTARITY PROBLEMS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2002年第6期20卷 561-574页

作者： Zhong-zhi Bai(State key laboratory of scientific/Engineering computing, Institute of Computational Mathematicsand scientific/Engineering computing, Academy of Mathematics and System Sciences, ChineseAcademy of Sciences, Beijing 100080, China) Institute of Computational Mathematics and scientific/Engineering computing Academy of Mathematics and System Sciences Chinese Academy of Sciences State Key Laboratory of Scientific/Engineering ComputingCAS 北京 100080

Presents a study of the numerical behaviors of the relaxed asynchronous multisplitting methods for linear complementarity problems by solving typical problems from practical applications on a real multiprocessor system. Description of the tested problems and computing environment used in the computations; Description of the asynchronous multisplitting unsymmetric accelerated overrelaxation method; Discussion of results.

关键词： linear complementarity problem matrix multisplitting asynchronous iterative methods numerical experiment

A SCALED CENTRAL PATH FOR LINEAR PROGRAMMING

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2001年第1期19卷 35-40页

作者： Ya-xiang Yuan (State key laboratory of scientific and Engineering computing, Institute of Computational Mathematics and scientific/Engineering computing Chinese Academy of Sciences, Beijing 100080, China) 中科院计算数学与工程计算数学所科学与工程计算国家重点实验室北京 100080

Proposes a central path in interior point methods which scales the variables. Role of the central path in interior point methods; Methodology; Results and discussion.

关键词： central path interior point methods linear programming

AN ITERATIVE PROCEDURE FOR DOMAIN DECOMPOSITION METHOD OF SECOND ORDER ELLIPTIC PROBLEM WITH MIXED BOUNDARY CONDITIONS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1997年第4期15卷 319-326页

作者： Lie-heng Wang (State key laboratory of scientific and Engineering computing, ICMSEC, Chinese Academy of Sciences, Beijing, China) 中科院计算数学与科学工程计算所科学与工程计算国家重点实验室北京

This paper is devoted to study of an iterative procedure for domain decomposition method of second order elliptic problem with mixed boundary conditions (i.e., Dirichlet condition on a part of boundary and Neumann condition on the another part of boundary). For the pure Dirichlet problem, Marini and Quarteroni [3], [4] considered a similar approach, which is extended to more complex problem in this paper.

关键词： EH Math AN ITERATIVE PROCEDURE FOR DOMAIN DECOMPOSITION METHOD OF SECOND ORDER ELLIPTIC PROBLEM WITH MIXED BOUNDARY CONDITIONS

VARIATIONS ON A THEME BY EULER

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1998年第2期16卷 97-106页

作者： Kang Feng Dao-liu Wang (State key laboratory of scientific and Engineering computing, ICMSEC, Chinese Academy of Sciences, Beijing 100080, China) Chinese Acad Sci ICMSEC State Key Lab Sci & Engn Comp Beijing 100080 Peoples R China

The oldest and simplest difference scheme is the explicit Euler method. Usually, it is not symplectic for general Hamiltonian systems. It is interesting to ask: Under what conditions of Hamiltonians, the explicit Euler method becomes symplectic? In this paper, we give the class of Hamiltonians for which systems the explicit Euler method is symplectic. In fact, in these cases, the explicit Euler method is really the phase how of the systems, therefore symplectic. Most of important Hamiltonian systems can be decomposed as the summation of these simple systems. Then composition of the Euler method acting on these systems yields a symplectic method, also explicit. These systems are called symplectically separable. Classical separable Hamiltonian systems are symplectically separable. Especially, we prove that any polynomial Hamiltonian is symplectically separable.

关键词： Hamiltonian systems symplectic difference schemes explicit Euler method nilpotent symplectically separable

A NEW GENERALIZED ASYNCHRONOUS PARALLELMULTISPLITTING ITERATION METHOD

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1999年第5期17卷 449-456页

作者： Zhong-zhi Bai(State key laboratory of scientific and Engineering computing, ICMSEC, Chinese Academyof Sciences, Beijing 100080, China) Chinese Acad Sci ICMSEC State Key Lab Sci & Engn Comp Beijing 100080 Peoples R China

For the large sparse systems of linear and nonlinear equations, a new class of generalized asynchronous parallel multisplitting iterative method is presented, and its convergence theory is established under suitable conditions. This method not only unifies the discussions of various existing asynchronous multisplitting iterations, but also affords new algorithmic and theoretical results for the parallel solution of large sparse system of linear equations. Besides its generality, this method is also much more suitable for implementing on the MIMD multiprocessor systems.

关键词： systems of linear and nonlinear equations asynchronous multisplitting iteration relaxed method convergence theory