检索结果-南通市图书馆

On Hamiltonian realization of time-varying nonlinear systems

在线全文

学校读者我要写书评

暂无评论

science in China(series F) 2007年第5期50卷 671-685页

作者： wANG YuZhen Ge s. s. CHENG DaiZhan school of Control science and Engineering Shandong University Jinan 250061 China Department of Electrical and Computer Engineering the National University of Singapore Singapore 117576 Institute of systems science Chinese Academy of Sciences Beijing 100080 China

This paper Investigates Hamiltonian realization of time-varying nonlinear （TVN） systems, and proposes a number of new methods for the problem. It is shown that every smooth TVN system can be expressed as a generalized Hamiltonian system if the origin is the equilibrium of the system. If the Jacooian matrix of a TVN system is nonsingular, the system has a generalized Hamiltonian realization whose structural matrix and Hamiltonian function are given explicitly. For the case that the Jacobian matrix is sin- gular; this paper provides a constructive decomposition method, and then proves that a TVN system has a generalized Hamiltonian realization if its Jacobian matrix has a non- singular main diagonal block. Furthermore, some sufficient （necessary and sufficient） conditions for dissipative Hamiltonian realization of TVN systems are also presented in this paper.

关键词： generalized Hamiltonian realization dissipative Hamiltonian realization diffoemorphism structural construction

searching for candidate genes for male infertility

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2003年第2期5卷 137-147页

作者： B.N.Truong E.K.Moses J.E.Armes D.J.Venter H.w.G.Baker Melbourne IVF Centre Centre Department of Obstetrics and Gynaecology Royal Women'sHospital University of Melbourne Victoria 3053 AustraliaPregnancy Research Centre Department of Obstetrics and Gynaecology Royal Women's Hospital University of Melbourne Victoria 3053 AustraliaDepartments of Pathology and Obstetrics/Gynaecology University of Melbourne Victoria 3010 AustraliaDepartments of Pathology and Obstetrics/Gynaecology University of Melbourne Victoria 3010 Australia Murdoch Children's Research Institute Royal Children's Hospital Victoria 3052 AustraliaDepartments of Pathology and Obstetrics/Gynaecology University of Melbourne Victoria 3010 Australia

Aim: we describe an approach to search for candidate genes for male infertility using the two human genome databases: the public University of California at santa Cruz (UCsC) and private Celera databases which list kn... 详细信息

stract>Aim: we describe an approach to search for candidate genes for male infertility using the two human genome databases: the public University of California at santa Cruz (UCsC) and private Celera databases which list known and predicted gene sequences and provide related information such as gene function, tissue expression, known mutations and single nucleotide polymorphisms (sNPs). Methods and Results: To demonstrate this in silico research, the following male infertility candidate genes were selected: (1) human BOULE, mutations of which may lead to germ cell arrest at the primary spermatocyte stage, (2) mutations of casein kinase 2 alpha genes which may cause globozoospermia, (3) DMR-N9 which is possibly involved in the spermatogenic defect of myotonic dystrophy and (4) several testes expressed genes at or near the breakpoints of a balanced translocation associated with hypospermatogenesis. we indicate how information derived from the human genome databases can be used to confirm these candidate genes may be pathogenic by studying RNA expression in tissue arrays using in situ hybridization and gene sequencing. Conclusion: The paper explains the new approach to discovering genetic causes of male infertility using information about the human genome.

关键词： male infertility genetics spermatogenesis human genome database tissues array

在线全文

学校读者我要写书评

暂无评论

COBOL程序设计结构式方法第1版

s-fuzzy Version of stone's Theorem for Distributive Lattices

1986年

作者：（美）艾贝尔（abel P.）张作民徐承业译

书名原文: COBOL programming a structured approach

ISBN: (纸本)15034·2958

书名原文: COBOL programming a structured approach

关键词： COBOL语言程序设计

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

模糊系统与数学 2011年第4期25卷 47-54页

作者： Y.s.Pawar s.s.Khopade Department of Mathematics Shivaji University

In this paper,we initiate a study of s-fuzzy ideal(filter) of a lattice where s stands for a meet semilattice.A s-fuzzy prime ideal(filter) of a lattice is defined and it is proved that a s-fuzzy ideal(filter) of a lattice is s-fuzzy prime ideal(filter) if and only if any non-empty α-cut of it is a prime ideal(filter).stone's theorem for a distributive lattice is extended by considering s-fuzzy ideals(filters).

关键词： Distributive Lattice semilattice Fuzzy Ideal Fuzzy Filter Prime Fuzzy Ideal Prime Fuzzy Filter

在线全文

学校读者我要写书评

暂无评论

幔源橄榄岩包体中单斜辉石的微量元素组成

科学通报 1992年第24期37卷 2255-2258页

作者：陈道公 s.Y.O'Reilly w.L.Griffin 中国科学技术大学合肥230026 澳大利亚Macquarie大学地学院澳大利亚联邦科学工业研究组织勘探地球科学分部

了解地幔岩石中主要矿物相的微量元素分布、丰度状况对理解部分熔融、地幔的富集和亏损以及地幔交代作用等有重要意义。以往地幔样品的微量元素多由仪器中子活化分析所得,质量不高。我们采用高精度微区微粒的质子微探针(PIXE)技术对中... 详细信息

了解地幔岩石中主要矿物相的微量元素分布、丰度状况对理解部分熔融、地幔的富集和亏损以及地幔交代作用等有重要意义。以往地幔样品的微量元素多由仪器中子活化分析所得,质量不高。我们采用高精度微区微粒的质子微探针(PIXE)技术对中国不同地区50个橄榄岩包体中173个单斜辉石颗粒进行了微量元素定量测定,共获得10种微量元素和5种主要元素含量,本文对其总体情况作一扼要介绍,实测数据及模式处理等将另行报道。

关键词：微量元素单斜辉石地幔橄榄岩

在线全文

学校读者我要写书评

暂无评论

作者： s.w.C·帕克

学校读者我要写书评

暂无评论

脑和心理的发展周期

全球教育展望 2001年第5期30卷 1-4,13页

作者： K.w.费希尔 s.P.罗斯郑太年哈佛大学教育学院认知发展实验室科罗拉多大学华东师范大学课程与教学研究所

思维和学习的变化与脑的物理变化相关。这些变化的重复性模式表明。

关键词：人脑心理发展周期认知发展周期大脑皮层生长周期

MHD three dimensional flow of viscoelastic fluid with thermal radiation and variable thermal conductivity

在线全文

学校读者我要写书评

暂无评论

Journal of Central south University 2014年第10期21卷 3911-3917页

作者： sHEHZAD s A HAYAT T ALsAEDI A Department of Mathematics Comsats Institute of Information Technology Department of Mathematics Quaid-i-Azam University

The objective of the present work is to model the magnetohydrodynamic(MHD) three dimensional flow of viscoelastic fluid passing a stretching surface. Heat transfer analysis is carried out in the presence of variable thermal conductivity and thermal radiation. Arising nonlinear analysis for velocity and temperature is computed. Discussion to importantly involved parameters through plots is presented. Comparison between present and previous limiting solutions is shown. Numerical values of local Nusselt number are computed and analyzed. It can be observed that the effects of viscoelastic parameter and Hartman number on the temperature profile are similar in a qualitative way. The variations in temperature are more pronounced for viscoelastic parameter K in comparison to the Hartman number M. The parameters N and ε give rise to the temperature. It is interesting to note that values of local Nusselt number are smaller for the larger values of ε.

关键词： three dimensional flow viscoelastic fluid variable thermal conductivity thermal radiation

在线全文

学校读者我要写书评

暂无评论

The Audacity of Hope

ChinAfrica 2020年第3期12卷 58-58页

作者： abel Hara 不详

In recent weeks,not only has the news of novel coronavirus outbreak in China become an international concern but the declaration of the ongoing epidemic as a global health emergency by the world Health Organization ha... 详细信息

关键词： wuhan his novel