检索结果-南通市图书馆

A mixed finite element method for the unilateral contact problem in elasticity

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 2006年第4期49卷 513-524页

作者： HUA Dongying & WANG Lieheng The First Fundamental Department, beijing information Technology institute, beijing 100101, china institute of Computational Mathematics and Scientific/Engineering Computing, academy of Mathematics and System sciences, chinese academy of sciences, beijing 100080, china 1. The First Fundamental Department Beijing Information Technology Institute Beijing 100101 China 2. institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China

In this paper, we provide a new mixed finite element approximation of the variational inequality resulting from the unilateral contact problem in elasticity. We use the continuous piecewise P2-P1 finite element to approximate the displacement field and the normal stress component on the contact region. Optimal convergence rates are obtained under the reasonable regularity hypotheses. Numerical example verifies our results.

关键词： unilateral contact problem, mixed finite element method.

PARALLEL CHAOTIC MULTISPLITTING ITERATIVE METHODS FOR THE LARGE SPARSE LINEAR COMPLEMENTARITY PROBLEM

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2001年第3期19卷 281-292页

作者： Zhong-zhi Bai (State key laboratory of Scientific/Engineering Competing institute of Computational Mathematics and Scientific/Engineering Computing, academy of Mathematics and Systems sciences, 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

Focuses on a study which presented a parallel chaotic multisplitting method for solving the large sparse linear complementarity problem. Preliminaries of the study; Equations of the parallel chaotic multisplitting met... 详细信息

关键词： linear complementarity problem matrix multisplitting chaotic iteration relaxed method convergence property

On the Organizational Dynamics of the Genetic Code

在线全文

学校读者我要写书评

暂无评论

genomics,Proteomics & Bioinformatics 2011年第Z1期 21-29页

作者： Zhang Zhang1 and Jun Yu1,2* 1Plant Stress genomics Research Center, Division of Chemical and Life sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia 2CAS key laboratory of genome sciences and information, beijing institute of genomics, chinese academy of sciences, beijing 100029, china.

The organization of the canonical genetic code needs to be thoroughly illuminated. Here we reorder the four nucleotides-adenine, thymine, guanine and cytosine-according to their emergence in evolution, and apply the organizational rules to devising an algebraic representation for the canonical genetic code. Under a framework of the devised code, we quantify codon and amino acid usages from a large collection of 917 prokaryotic genome sequences, and associate the usages with its intrinsic structure and classification schemes as well as amino acid physicochemical properties. Our results show that the algebraic representation of the code is structurally equivalent to a content-centric organization of the code and that codon and amino acid usages under different classification schemes were correlated closely with GC content, implying a set of rules governing composition dynamics across a wide variety of prokaryotic genome sequences. These results also indicate that codons and amino acids are not randomly allocated in the code, where the six-fold degenerate codons and their amino acids have important balancing roles for error minimization. Therefore, the content-centric code is of great usefulness in deciphering its hitherto unknown regularities as well as the dynamics of nucleotide, codon, and amino acid compositions.

关键词： genetic code codon GC content purine content organizational dynamics compositional dynamics

Light A physics in the lepton-specific two-Higgs doublet model

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(Physics,Mechanics & Astronomy) 2010年第11期53卷 1981-1987页

作者： CAO JunJie 1,HENG ZhaoXia 2,3 & WAN PeiHua 1 1 College of Physics & information Engineering,Henan Normal University,Xinxiang 453007,china 2 key laboratory of Frontiers in Theoretical Physics,institute of Theoretical Physics,chinese academy of sciences,beijing 100190,china 3 Kavli institute for Theoretical Physics china,chinese academy of sciences,beijing 100190,china 1. College of Physics & information Engineering Henan Normal University Xinxiang 453007 China2. Key Laboratory of Frontiers in Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China3. Kavli Institute for Theoretical Physics China Chinese Academy of Sciences Beijing 100190 China

We examine various direct and indirect constraints on the lepton-specific two-Higgs doublet model and discuss its phenomenology at colliders in the allowed parameter *** constraints we consider come from the precision electroweak data,the direct search for Higgs boson,the muon anomalous magnetic moment,as well as some theoretical consistency *** find that in the allowed parameter space the CP-odd Higgs boson A is rather light (m A < 30 GeV with 95% possibility),which is composed dominantly by the leptonic Higgs and decays dominantly into τ + τ;while the SM-like Higgs boson h (responsible largely for electroweak symmetry breaking) decays dominantly in the mode h → AA → 4τ with a large decay width,which will make the Higgs discovery more difficult at the ***,this scenario predicts rare Z decays Z → AAA and Z →τ + τA with their branching ratios ranging from 10-8 to 10-and 10-5 to 10-4 respectively,which may be accessible at the GigaZ option of the ILC.

关键词： Lepton-specific two-Higgs doublt model light Higgs boson A Z decays

A direct product decomposition of QMV algebras

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2012年第4期55卷 841-850页

作者： LU Xian 1 ,SHANG Yun 1,& LU RuQian 1,2 1 institute of Mathematics,academy of Mathematics and Systems Science,beijing 100190,china 2 key laboratory of Intelligent information Processing,institute of Computing Technology,chinese academy of sciences,beijing 100190,china 1. institute of Mathematics Academy of Mathematics and Systems Science Beijing 100190 China2. Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

We study the direct product decomposition of quantum many-valued algebras (QMV algebras) which generalizes the decomposition theorem of ortholattices (orthomodular lattices).In detail,for an idempo- tent element of a given QMV algebra,if it commutes with every element of the QMV algebra,it can induce a direct product decomposition of the QMV *** the same time,we introduce the commutant C(S) of a set S in a QMV algebra,and prove that when S consists of idempotent elements,C(S) is a subalgebra of the QMV *** also generalizes the cases of orthomodular lattices.

关键词： QMV algebra commutativity idempotent decomposition theorem

Fiducial intervals of restricted parameters and their applications

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2005年第11期48卷 1567-1583页

作者： LI Xinmin, LI Guoying & XU Xingzhong College of Mathematics and information sciences, Shandong University of Technology, Zibo 255049, china academy of Mathematics and System sciences, chinese academy of sciences, beijing 100800, china Department of Mathematics, beijing institute of Technology, beijing 100801, china 1. College of Mathematics and information sciences Shandong University of Technology 255049 Zibo China 2. academy of Mathematics and System sciences Chinese Academy of Sciences 100800 Beijing China 3. Department of Mathematics Beijing Institute of Technology 100801 Beijing China

In practice, the unknown parameters are often restricted. This paper provides a general method for constructing the fiducial intervals of the restricted parameters. Applying the general method, the fiducial intervals are constructed for the location (scale)parameters and the difference (ratio) of two locations (scales) in a location (scale) family of distributions. The frequency properties of these intervals are verified. For a variance components model, the fiducial intervals for the three parameters of common interest are obtained. Their frequency properties are investigated theoretically and computationally.

关键词： restricted parameter space,fiducial interval,frequency property,variance components

Role of ubiquitination in meiotic recombination repair

在线全文

学校读者我要写书评

暂无评论

Science china(Life sciences) 2010年第4期53卷 447-454页

作者： CUI Li & LI Wei State key laboratory of Reproductive Biology, institute of Zoology, chinese academy of sciences, beijing 100101, china 1. State key laboratory of Reproductive Biology Institute of Zoology Chinese Academy of Sciences Beijing 100101 China

Programmed and unprogrammed double-strand breaks (DSBs) often arise from such physiological requirements as meiotic recombination, and exogenous insults, such as ionizing radiation (IR). Due to deleterious impacts on genome stability, DSBs must be appropriately processed and repaired in a regulatory manner. Recent investigations have indicated that ubiquitination is a critical factor in DNA damage response and meiotic recombination repair. This review summarizes the effects of proteins and complexes associated with ubiquitination with regard to homologous recombination (HR)-dependent DSB repair.

关键词： ubiquitin meiosis homologous recombination DNA double-strand breaks

Mechanism and Defense on Malicious Code

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural sciences 2005年第1期10卷 83-88页

作者： WEN Wei-ping 1,2,3, QING Si-han 1,2,31. institute of Software, the chinese academy of sciences, beijing 100080, china 2.Engineering Research Center for information Security Technology, the chinese academy of sciences, beijing 100080, china 3.Graduate School of the chinese academy of sciences, beijing 100080, china institute of Software the Chinese Academy of Sciences Beijing 100080 China

With the explosive growth of network applications, the threat of the malicious code against network security becomes increasingly serious. In this paper we explore the mechanism of the malicious code by giving an attack model of the malicious code, and discuss the critical techniques of implementation and prevention against the malicious code. The remaining problems and emerging trends in this area are also addressed in the paper.

关键词： malicious code attacking model mechanism defense system security network security

A computational model for feature binding

在线全文

学校读者我要写书评

暂无评论

Science china(Life sciences) 2008年第5期51卷 470-478页

作者： SHI ZhiWei1,2, SHI ZhongZhi1, LIU Xi1,2 & SHI ZhiPing1 1 key laboratory of Intelligent information Processing, institute of Computing Technology, chinese academy of sciences, beijing 100190, china 2 Graduate University of chinese academy of sciences, beijing 100049, china key laboratory of Intelligent information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Graduate University of chinese academy of sciences Beijing 100049 China

The "Binding Problem" is an important problem across many disciplines, including psychology, neuroscience, computational modeling, and even philosophy. In this work, we proposed a novel computational model, Bayesian Linking Field Model, for feature binding in visual perception, by combining the idea of noisy neuron model, Bayesian method, Linking Field Network and competitive mechanism. Simulation Experiments demonstrated that our model perfectly fulfilled the task of feature binding in visual perception and provided us some enlightening idea for future research.

关键词： Binding Problem computational model Bayesian Linking Field Model