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USSR Computational Mathematics and Mathematical Physics最新文献

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Analysis of transient electromagnetic processes in wire antenna systems 有线天线系统瞬变电磁过程分析
USSR Computational Mathematics and Mathematical Physics Pub Date : 1990-01-01 DOI: 10.1016/0041-5553(90)90017-M
V.A. Strizhkov
{"title":"Analysis of transient electromagnetic processes in wire antenna systems","authors":"V.A. Strizhkov","doi":"10.1016/0041-5553(90)90017-M","DOIUrl":"10.1016/0041-5553(90)90017-M","url":null,"abstract":"<div><p>The problems of the correctness and accuracy of the Fredholm integral equations of the first kind which arise when analysing non-stationary processes in thin-wire structures are investigated. Some transients that occur in antenna arrays consisting of unbalanced dipoles are considered.</p></div>","PeriodicalId":101271,"journal":{"name":"USSR Computational Mathematics and Mathematical Physics","volume":"30 1","pages":"Pages 123-125"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0041-5553(90)90017-M","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78393661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical canonical factorization algorithms and their application 数值正则分解算法及其应用
USSR Computational Mathematics and Mathematical Physics Pub Date : 1990-01-01 DOI: 10.1016/0041-5553(90)90070-9
R.P. Tarasov
{"title":"Numerical canonical factorization algorithms and their application","authors":"R.P. Tarasov","doi":"10.1016/0041-5553(90)90070-9","DOIUrl":"10.1016/0041-5553(90)90070-9","url":null,"abstract":"<div><p>A study is made of numerical algorithms for canonical factorization, of two types: a) polar decomposition of an arbitrary bounded operator in <em>H</em>-space, and b) factorization of an operator-valued function of the unilateral shift operator in the space <em>l</em><sub>2</sub>.</p></div>","PeriodicalId":101271,"journal":{"name":"USSR Computational Mathematics and Mathematical Physics","volume":"30 2","pages":"Pages 1-12"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0041-5553(90)90070-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79396440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exact auxiliary functions in optimization problems 优化问题中的精确辅助函数
USSR Computational Mathematics and Mathematical Physics Pub Date : 1990-01-01 DOI: 10.1016/0041-5553(90)90005-D
Yu.G. Yevtushenko, V.G. Zhadan
{"title":"Exact auxiliary functions in optimization problems","authors":"Yu.G. Yevtushenko,&nbsp;V.G. Zhadan","doi":"10.1016/0041-5553(90)90005-D","DOIUrl":"10.1016/0041-5553(90)90005-D","url":null,"abstract":"<div><p>The concept of an exact auxiliary function such that the problem of minimizing it has the same set of solutions as the original optimization problem. Sufficient conditions are given for the auxiliary functions to be exact and examples of such functions are described. The introduction of exact auxiliary functions makes it possible to reduce the solution of the original problem to single minimization of an auxiliary function. The constrained optimization problem often reduces to unconstrained optimization.</p></div>","PeriodicalId":101271,"journal":{"name":"USSR Computational Mathematics and Mathematical Physics","volume":"30 1","pages":"Pages 31-42"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0041-5553(90)90005-D","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75780671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 33
Two-dimensional non-stationary flows of a viscous fluid 粘性流体的二维非稳态流动
USSR Computational Mathematics and Mathematical Physics Pub Date : 1990-01-01 DOI: 10.1016/0041-5553(90)90067-3
K.M. Zhumabekova, V.P. Shidlovskii
{"title":"Two-dimensional non-stationary flows of a viscous fluid","authors":"K.M. Zhumabekova,&nbsp;V.P. Shidlovskii","doi":"10.1016/0041-5553(90)90067-3","DOIUrl":"10.1016/0041-5553(90)90067-3","url":null,"abstract":"","PeriodicalId":101271,"journal":{"name":"USSR Computational Mathematics and Mathematical Physics","volume":"30 4","pages":"Pages 216-217"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0041-5553(90)90067-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"96297526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A method of finding the integral characteristics of attenuation factors for transfer equations 求传递方程衰减因子积分特性的方法
USSR Computational Mathematics and Mathematical Physics Pub Date : 1990-01-01 DOI: 10.1016/0041-5553(90)90065-Z
D.S. Anikonov, I.Sh. Irkegulov
{"title":"A method of finding the integral characteristics of attenuation factors for transfer equations","authors":"D.S. Anikonov,&nbsp;I.Sh. Irkegulov","doi":"10.1016/0041-5553(90)90065-Z","DOIUrl":"https://doi.org/10.1016/0041-5553(90)90065-Z","url":null,"abstract":"<div><p>An algorithm for finding the integral characteristics (optical thicknesses) of attenuation factors for illuminated regions containing inner zones of various forms is constructed and numerically implemented.</p></div>","PeriodicalId":101271,"journal":{"name":"USSR Computational Mathematics and Mathematical Physics","volume":"30 4","pages":"Pages 208-212"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0041-5553(90)90065-Z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91684365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The generalized residual principle and generalized residual method for l-pseudo-solutions l-伪解的广义残差原理与广义残差法
USSR Computational Mathematics and Mathematical Physics Pub Date : 1990-01-01 DOI: 10.1016/0041-5553(90)90183-S
B. Aliyev
{"title":"The generalized residual principle and generalized residual method for l-pseudo-solutions","authors":"B. Aliyev","doi":"10.1016/0041-5553(90)90183-S","DOIUrl":"10.1016/0041-5553(90)90183-S","url":null,"abstract":"<div><p>Regularizing algorithms to determine approximations to <em>L</em>-pseudo-solutions are proposed on the basis of a generalized residual principle and a generalized residual method, when the initial data are specified only approximately. It is shown that the algorithms are equivalent.</p></div>","PeriodicalId":101271,"journal":{"name":"USSR Computational Mathematics and Mathematical Physics","volume":"30 3","pages":"Pages 1-7"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0041-5553(90)90183-S","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91348529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
External estimates and construction of attainability sets for controlled systems 受控系统可达性集的外部估计和构造
USSR Computational Mathematics and Mathematical Physics Pub Date : 1990-01-01 DOI: 10.1016/0041-5553(90)90083-5
D.L. Kondrat'yev, A.V. Lotov
{"title":"External estimates and construction of attainability sets for controlled systems","authors":"D.L. Kondrat'yev,&nbsp;A.V. Lotov","doi":"10.1016/0041-5553(90)90083-5","DOIUrl":"10.1016/0041-5553(90)90083-5","url":null,"abstract":"<div><p>A numerical method for constructing external estimates of attainability sets for non-linear controlled systems of ordinary differential equations is proposed. In some cases the method enables the attainability set itself to be approximated.</p></div>","PeriodicalId":101271,"journal":{"name":"USSR Computational Mathematics and Mathematical Physics","volume":"30 2","pages":"Pages 93-97"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0041-5553(90)90083-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91539396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
A numerical method for solving the radiation transport equation in planar and spherical geometry 求解平面和球面几何辐射输运方程的数值方法
USSR Computational Mathematics and Mathematical Physics Pub Date : 1990-01-01 DOI: 10.1016/0041-5553(90)90060-6
V.I. Gryn, A.I. Marchenko, V.V. Urban
{"title":"A numerical method for solving the radiation transport equation in planar and spherical geometry","authors":"V.I. Gryn,&nbsp;A.I. Marchenko,&nbsp;V.V. Urban","doi":"10.1016/0041-5553(90)90060-6","DOIUrl":"10.1016/0041-5553(90)90060-6","url":null,"abstract":"<div><p>A computational scheme is proposed for the numerical solution of the stationary radiation transport equation ignoring scattering. It is proved that, at large optical thicknesses, the cosines and absorption coefficients averaged over the one-sided radiation intensities cannot be used in the zeroth approximation and it is necessary to use their first approximation.</p></div>","PeriodicalId":101271,"journal":{"name":"USSR Computational Mathematics and Mathematical Physics","volume":"30 4","pages":"Pages 172-181"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0041-5553(90)90060-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89671765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the existence of solutions of the contrast structure type 论对比结构类型解的存在性
USSR Computational Mathematics and Mathematical Physics Pub Date : 1990-01-01 DOI: 10.1016/0041-5553(90)90007-F
A.B. Vasil'yeva, A.V. Pavel'yev
{"title":"On the existence of solutions of the contrast structure type","authors":"A.B. Vasil'yeva,&nbsp;A.V. Pavel'yev","doi":"10.1016/0041-5553(90)90007-F","DOIUrl":"10.1016/0041-5553(90)90007-F","url":null,"abstract":"<div><p>A proof of the existence of stationary solutions of a system of two diffusion equations, where the solutions are of the contrast-structure type is given.</p></div>","PeriodicalId":101271,"journal":{"name":"USSR Computational Mathematics and Mathematical Physics","volume":"30 1","pages":"Pages 54-64"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0041-5553(90)90007-F","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"101926062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Weighted estimate of the Monte-Carlo method for calculating the higher moments of the additive transport characteristics of multiplying particles 加权估计的蒙特卡罗方法计算的高矩的附加输运特性的倍增粒子
USSR Computational Mathematics and Mathematical Physics Pub Date : 1990-01-01 DOI: 10.1016/0041-5553(90)90011-G
A.V. Lappa
{"title":"Weighted estimate of the Monte-Carlo method for calculating the higher moments of the additive transport characteristics of multiplying particles","authors":"A.V. Lappa","doi":"10.1016/0041-5553(90)90011-G","DOIUrl":"10.1016/0041-5553(90)90011-G","url":null,"abstract":"<div><p>A closed Integral representation is given for a moment of an arbitrary order of an arbitrary additive stochastic characteristic of a cascade process involving the transport of particles in a substance. An unbiased non-simulation estimate of the Monte-Carlo method is proposed for calculating such moments on the trajectories of a branching Markov process with discrete time. An example of the efficient use of the estimate is given.</p></div>","PeriodicalId":101271,"journal":{"name":"USSR Computational Mathematics and Mathematical Physics","volume":"30 1","pages":"Pages 91-100"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0041-5553(90)90011-G","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73433610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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