An Inverse Problem of an Unknown Source in a Heat Equation

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Study on Electrical Property of Polyaniline Composite Film

Polyaniline was synthesized by chemically oxidative poly-merization.By means of infrared spectroscopy,the dif-ference between its intrinsic state structure and its dopedstate structure was determined for researching the rela-tionship between macromolecular structure and conduc-tive property before and after doping.The morphologyof solution-processed polyblends with the electricallyconductive polyaniline-camphor sulfonic acid complex(PAn-CSA)was investigated by using scanning electronmicroscopy.The conductive percolation threshold of thecomposite films is about 2.8%.     

Analysis of the Relation between Interest Rate Policy and the Stock Market in China

1　IntroductionThegrowthofsocialeconomyisbasedontheflowofcapitalsfromtheinvestorstotheen-terprises,fromtheloweffectivedepartmentstothehighereffectivedepartments,fromtheconservativedepartmentstotheinnovativedepartments.Inordertoensurethenormalflowofth...     

可持续发展与灾害类型的分析研究

在人口与经济快速增长的条件下，人与自然关系的不协调发展导致了灾害的频繁发生，为了拓展、良化人类生存空间，对灾害的类型与危害进行了系统分析，并提出了防减灾的措施．     

ON ISOTOPY CLASSIFICATION OF EMBEDDINGS OF n-MANIFOLDS IN 2n-MANIFOLDS

Let M be a compact n-manifold without boundary, U a 2n-manifold andf: M→U a map. Under the condition that f_*: π_1(M)→π(U) is surjective and thatker f_* contains no elements represented by orentation-reversing loops, we calculate the set[M U]_f=π_1(U~M, E, f) where E is the space of embeddings of M into U which arehomotopic to f.     

论树图中两点间的路长

本文证明:如果连通图G的树图Г(G)不是超立方体,则对G的任两支撑树T和T′,除了当每一e′∈T′—T都满足|C(T,e′)|=2并且C(T,e′)为G的块时,Г(G)中没有长为d(T,T′) 1的连接T和T′的路外,对每一自然数k,d(T,T′)≤k≤t(G)-1,Γ(G)中都有长为k的连接T和T′的路(这里C(T,e′)、d(T,T′)和t(G)分别表示T e′中的唯一圈,Γ(G)中T和T′的距离、及G的支撑树数目)。     

Systems Engineering in China

A short history of Systems Engineering(SE) is described. The reasons why research work moves from Operations Research (OR), Management Science (MS) and Cybernetices to SE in China are given. This paper indicates some facets of the development of SE in China with emphasis on applications of SE.     

GRADUAL CHANGE AND SUDDEN CHANGE

In this paper, we prove that, if 0相似文献   

Equations of Fuzzy Criterion Models for Reservoir Operations

In this paper we discuss the equations of fuzzy criterion models for reservoir operations based on dynamic programming. The continuity, existence, uniqueness and stability of solutions are shown under some conditions.     

ANALYSIS OF BOUNDARY LAYER SINGULARITY OF A HYPERBOLIC EQUATION

Using the interpolation theory of a family of linear operators and the Sobolevspaces, we introduce a quantity J_∈~4(λ) which depicts the shape of the boundary layer, andthen analyze the boundary singularty of J_∈~4(λ). Our result shows that the thickness of theboundary layer (or the regular region of J_∈~4(λ)) is intrinsically related to the reciprocal ofthe order of the equation; the loss of boundary conditions between the singular solution andthe limit solution does not influence the thickness of the boundary layer, but it influencesthe process of increasing singularity of J_∈~4(λ); the more the loss of boundary conditions, thesmaller the region of increasing singularity. Finally, we give a definition of a neighborhoodof sudden change and propose an open problem regarding this neighborhood.