检索结果-南通市图书馆

The Behavior of Super-Brownian Motion near Extinction

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 1998年第3期14卷 315-320页

作者： Guo Junyi Wu Rong department of mathematics,{2., tianjin 300071. china department of mathematics Nankai University

We start from a super-Brownian motion with the branching mechanism presented by Dawson and Vinogradov. Its behaviour near extinction is studied in this paper, and the main result is that the diameter of the support te... 详细信息

关键词： Super-Brownian motion Extinction behaviour Branching mechanism

Inflow conditions for spatial direct numerical simulation of turbulent boundary layers

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2008年第8期51卷 1106-1115页

作者： HUANG ZhangFeng & ZHOU Heng department of Mechanics,tianjin {2.,tianjin 300072.china Liu-Hui Center of Applied mathematics,nankai {2. and tianjin {2.,tianjin 300072.china 1. department of Mechanics Tianjin University Tianjin 300072 China 2. Liu-Hui Center of Applied mathematics Nankai University and Tianjin University Tianjin 300072 China

The inflow conditions for spatial direct numerical simulation(SDNS) of turbulent boundary layers should reflect the characteristics of upstream turbulence,which is a puzzle. In this paper a new method is suggested,in which the flow field obtained by using temporal direct numerical simulation(TDNS) for fully developed turbulent flow(only flow field for a single moment is sufficient) can be used as the inflow of SDNS with a proper transformation. The calculation results confirm that this method is feasible and effective. It is also found that,under a proper time-space transformation,all statistics of the fully developed turbulence obtained by both temporal mode and spatial mode DNS are in excellent agreement with each other,not only qualitatively,but also quantitatively. The normal-wise distributions of mean flow profile,turbulent Mach number and the root mean square(RMS) of the fluctuations of various variables,as well as the Reynolds stresses of the fully developed turbulence obtained by using SDNS,bear similarity in nature.

关键词： inflow conditions spatial direct numerical simulation turbulent boundary layer similarity

Relative Index and the Pairing between the Relative K-Homology and K-Colomogy

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 1996年第2期12卷 156-161页

作者： Zhou Mai Zhou Mai department of mathematics{2. tianjin,300071.china

In this paper we disscus the relative index for the Atiyah-Patodi-Singer type elliptic boundary value problems,as an application we give a new approach to the pairing between the relative K-homology and K-cohomology.

关键词： Relative index Boundary value problem K-homology K-cohomology

Geometric Parameters Corresponding to Representations of the Classical Groups with Integral Infinitesimal Characters

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 1996年第3期12卷 268-284页

作者： Hou Zixin, department of mathematics{2. tianjin, 300071.chinaZhao Qiang, department of mathematics Peking university Beijing, 100871 china and department of mathematics Northwest Normal university Lanzhou, 730070 china department of mathematics Nankai University Tianjin China department of mathematics Peking University Beijing China department of mathematics Northwest Normal University Lanzhou China

In this paper we calculate the orbits of flag manifolds of the complex classical groups under the action of the sets of fixed points of Cartan involutions, and determine all the geometric parameters corresponding to representations of the classical groups with integral infinitesimal char- acters, which are used to discuss Arthur conjecture and the Langlands classification of the irreducible admissible representations of real classical groups(see[1])

关键词： Extended groups Strong real forms E-groups Geometric parameters

FKBP2. in ER binds to BiP specifically

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2004年第1期47卷 17-23页

作者： ZHANG Wanqi, LI Hui, ZHANG Xiaobin, SHEN Ye, WANG Yinong, Ml Huaifeng & HE BinglinState Key Laboratory of Functional Polymer Materials for Adsorption and Separation, Chemical School of nankai university, tianjin 300071. china Hygienic School of {2. Medical university, tianjin 300071. china Medical School of nankai university, tianjin 300071. china 1. State Key Laboratory of Functional Polymer Materials for Adsorption and Separation Chemical School of Nankai University 300071 Tianjin China 2. Hygienic School of tianjin Medical university 300071 Tianjin China 3. Medical School of nankai university 300071 Tianjin China

FKBP2. was found in mouse endoplasmic reticulum (ER) in 1998. It consists of an N-terminal peptidyl-prolyl cis-trans isomerase (PPlase) domain and a C-terminal domain with Ca2. binding sites. The fusion protein of mouse FKBP2. and glutathione S-transferase (GST), GST-FKBP2., and the fusion protein of BiP, a member of heat shock protein 70 (Hsp 70) in ER, and GST, GST-BiP, were subcloned in E. coli, expressed and purified. The fusion proteins were restrictively digested by Factor Xa (FaXa) to obtain the free cloned proteins FKBP2. and BiP. With the assay of adsorption of free FKBP2. or BiP with GST-BiP or GST-FKBP2. attached to the Glutathione-Sepharose 4B, the adsorbed FKBP2. or BiP could be detected by Immunoblot. It means that FKBP2. binds to BiP. Furthermore, BiP in leukocyte ER-extract can be adsorbed with GST-FKBP2. attached to the glutathione-Sepharose 4B. It shows that FKBP2. binds to natural BiP in ER, too. These experiments show that a PPIase binds to a molecular chaperone of the Hsp70 family.

关键词： peptidyl-prolyl cis/trans isomerase, FKBP2., BiP, endoplasmic reticulum, specific binding.

Relations between structural properties and synchronizability on local world dynamical networks

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第8期17卷 956-961页

作者： Sun Shiwen~(**) Liu Zhongxin Chen Zengqiang Yuan Zhuzhi (department of Automation,nankai {2.,tianjin 300071.china) [a]department of Automation Nankai University Tianjin China

In this paper,the effects of various structural properties on the synchronization of coupled oscillators with local-world coupling configurations are *** is found that for local world networks,the larger heterogeneity of the degree distribution,the enhanced interconnection of nodes,and the increased clustering do not improve the synchronizability of dynamical *** the con- trary,the increase of the maximum betweenness centrality appears to be responsible for the decrease of the synchronizability.

关键词： complex dynamical network local-world evolving model synchronizability structural properties betweenness centrality

Weak minimum aberration and maximum number of clear two-factor interactions in 2.(IV)^(m-p)designs

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china mathematics 2005年第11期48卷 1479-1487页

作者： YANG Guijun,LIU Minqian & ZHANG Runchu department of Statistics, tianjin {2. of Finance and Economics, tianjin 3002.2. china department of Statistics, School of Mathematical Sciences and LPMC, nankai university, tianjin 300071. china 1. department of Statistics Tianjin University of Finance and Economics 300222 Tianjin China 2. department of Statistics School of Mathematical Sciences and LPMC Nankai University 300071 Tianjin China

Both the clear effects and minimum aberration criteria are the important rules for the design selection. In this paper, it is proved that some 2.Vm-p designs have weak minimum aberration, by considering the number of clear two-factor interactions in the designs. And some conditions are provided, under which a 2.Vm-p design can have the maximum number of clear two-factor interactions and weak minimum aberration at the same time. Some weak minimum aberration 2.Vm-p designs are provided for illustrations and two non-isomorphic weak minimum aberration 2.V13-6 designs are constructed at the end of this paper.

关键词： clear weak minimum aberration resolution wordlength pattern.

DISTURBANCE ATTENUATION VIA STATE-FEEDBACK CONTROLLERS

在线全文

学校读者我要写书评

暂无评论

Systems Science and Mathematical Sciences 1999年第4期12卷 338-343页

作者： CHEN Wanyi(College of mathematics,nankai {2., tianjin 300071. china)TU Fengsheng(department of Computer and System Science, nankai university, tianjin 300071. china) 南开大学数学系天津 300071 南开大学计算机系天津

This paper focuses on the H optimal control problem in which the wholestate is available for feedback. We show that in attenuating the disturbance, the Hoptimal performance of dynamic state-feedback is no better than that of static state-feedback, which generalizes current results for linear time-invariant systems with no directtransmission from the disturbance and control input to the controlled output.

关键词： Linear time-invariant systems H norm disturbance attenuation.

Maslov P-Index Theory for a Symplectic Path with Applications

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of mathematics,Series B 2006年第4期27卷 441-458页

作者： Chungen LIU School of mathematics and LPMC Nankai University Tianjin 300071 China.

The Maslov P-index theory for a symplectic path is defined. Various properties of this index theory such as homotopy invariant, symplectic additivity and the relations with other Morse indices are studied. As an appli... 详细信息

关键词： Hamiltonian system Symplectic path Maslov P-index Non-periodicboundary problem