拓扑分子格中的半正则半开元和正则半开元

本文引入并研究了拓扑分子格中的半正则半开（半正则半闭）元和正则半开（正则半闭）元的概念。在此基础上，引入了几乎不定（几乎不定开、几乎不定闭）、几乎半连续（几乎半开、几乎半闭）和几乎半不定（几乎半不定开、几乎半不定闭）序同态的概念，同时给出了它们的若干特征性质，以及它们同其它序同态之间的关系。     

对偶半模与自反半模

本文在半模范畴中建立了对偶半模与自反半模的概念，并把模范畴中有关模的对偶性与自反性的结果完整地推广到半模范畴中。     

半粘合拓扑空间与商半拓扑空间

作者在文［１］中给出了半粘合拓扑空间以及半粘合映射的定义，并得到了它们的基本性质。中文进一步研究了与半枯合拓扑空间和半粘合映射有关的问题。另外也讨论了商空间成为Ｓ_２－拓扑空间的条件．最后给出了一个半同胚定理。     

幂半格与半群

给出了半格上的幂半格的概念,讨论了幂半格的相关性质,建立了半格上的幂半格与半群之间的联系。     

半模的投射盖和半模的根

引入了半模的投射盖和半模的根的初步的定义，给出了半模范畴中投射盖和根的几个初步的结果，推广了模的投射盖和根的一些性质．     

广义半Smooth格

引入了广义半Smooth格和广义半Smooth代数格的概念,讨论了它们的一些基本性质,证明了完备格L是广义完全分配格当且仅当L是拟连续的广义半Smooth格。     

关于绝对半素环和绝对半素根

本文了绝对半素环的概念，研究了绝对半素与与半素环及素环之间的关系，讨论了由全体绝对半素环类决定的上根－－绝对半半素根及其性质。     

半拓扑子集的一些性质

本文引入半边界,并且进一步研究了半拓扑子集的一些性质,例如十集定理(定理2.6).另外也讨论了子空间,乘积空间和商空间中的半开集.     

半局部凸多目标半无限规划的最优性

研究半局部凸函数在多目标半无限规划下的最优性.利用半局部凸函数,讨论了在多目标半无限规划下的择一定理,最优性条件.使半局部凸函数运用的范围更加广泛.     

半严格-G-半预不变凸性与最优化

提出了一类新的广义凸函数——半严格-G-半预不变凸函数,它是一类重要的广义凸函数,是半严格预不变凸函数和半严格-G-预不变凸函数的真推广．首先,用例子说明了半严格-G-半预不变凸函数的存在性,并给出例子说明它是与G-半预不变凸函数不同的一类函数;然后,给出了半严格-G-半预不变凸函数的几个基本性质;最后,讨论了半严格-G-半预不变凸函数分别在无约束和带不等式约束的非线性规划问题中的应用,得到了一些最优性结果,并举例验证所得结论的正确性．     

Laplace方程边值问题的边界积分方程法

§ 1.　Introduction　　Inengineeringandtechnology ,theproblemofstaticelectricfieldscanbeattributedtotheboundaryproblemofLaplaceequationofstaticeletricpotentialfunction .Themethodsofclassi calmathematicalphysicscanbeonlyusedtosolveboundaryproblemofverysimpledomainandspecialboundarycondition .Althoughthemethodsoflimitedelementscanbeusedtosolvetheproblemsonarbitrarydomain ,butitneedstopartitionthewholedomainandtocalculateverycomplex .Theapproachofboundaryintegralequationistosolverelatedproblemsb…     

Noninvariant Boundary Conditions

It is generally believed that in order to solve initial and boundary value problems using Lie symmetry methods, the boundary and initial conditions need to be left invariant by the infinitesimal symmetry generator which admits the invariant solution. In this article we give less restrictive conditions on the imposed initial and boundary values in order that they be recoverable with a particular symmetry generator.     

非特征边界的MHD方程的边界层

考查了小粘性时非特征边界情况下MHD方程在边界附近的性质,说明速度在边界上不为零.源于之前非特征边界条件下不可压缩Navier-Stokes方程边界层的工作,证明了边界层的存在性,并得到了当粘性收敛于零时,MHD方程的解收敛于理想MHD方程的解.     

带谱参数边界条件的四阶边值问题的矩阵表示

研究了一类具有有限谱的带有谱参数边界条件的四阶微分方程边值问题及其矩阵表示,证明了对任意正整数m,所考虑的问题至多有2m+6个特征值,进一步给出这类带有谱参数边条件的四阶边值问题与一类矩阵特征值问题之间在具有相同特征值的意义下是等价的.     

粘滑混合边界条件下平面边界前的Stokes流动

对具有粘滑混合边界条件的平面边界,建立一个Stokes流动的一般性定理,利用双调和函数A与调和函数B,表示了3维Stokes流动的速度场和压力场.关于无滑动平面边界前Stokes流动的早期定理,成为该一般性定理的一个特例.进一步地,从一般性定理导出了一个推论,根据该Stokes流函数,给出了粘滑边界条件时刚性平面轴对称Stokes流动问题的解,得到了流体作用在边界上的牵引力和扭矩公式.给出了一个说明性的例子.     

SLE Boundary Visits

We study the probabilities with which chordal Schramm–Loewner evolutions (SLE) visit small neighborhoods of boundary points. We find formulas for general chordal SLE boundary visiting probability amplitudes, also known as SLE boundary zig-zags or order refined SLE multi-point Green’s functions on the boundary. Remarkably, an exact answer can be found to this important SLE question for an arbitrarily large number of marked points. The main technique employed is a spin chain–Coulomb gas correspondence between tensor product representations of a quantum group and functions given by Dotsenko–Fateev type integrals. We show how to express these integral formulas in terms of regularized real integrals, and we discuss their numerical evaluation. The results are universal in the sense that apart from an overall multiplicative constant the same formula gives the amplitude for many different formulations of the SLE boundary visit problem. The formula also applies to renormalized boundary visit probabilities for interfaces in critical lattice models of statistical mechanics: we compare the results with numerical simulations of percolation, loop-erased random walk, and Fortuin–Kasteleyn random cluster models at Q = 2 and Q = 3, and find good agreement.     

Asymptotic Boundary Value Problem of Harmonic Maps via Harmonic Boundary

We prove that given any continuous data f on the harmonic boundary of a complete Riemannian manifold with image within a ball in the normal range, there exists a harmonic map from the manifold into the ball taking the same boundary value at each harmonic boundary point as that of f.     

边界伸缩法

本文提出边界伸缩原理,并在此基础上提出边界伸缩法.不但较好地解决了边界元方法中求解边界附近区域包括边界上解的问题,而且可以方便地利用迭代过程改善求解精度.计算实例表明.本文提出的方法是十分有效的.     

From the Boundary of the Convex Core to the Conformal Boundary

If N is a hyperbolic 3-manifold with finitely generated fundamental group, then the nearest point retraction is a proper homotopy equivalence from the conformal boundary of N to the boundary of the convex core of N. We show that the nearest point retraction is Lipschitz and has a Lipschitz homotopy inverse and that one may bound the Lipschitz constants in terms of the length of the shortest compressible curve on the conformal boundary.     

Artificial Multilevel Boundary Element Preconditioners

A hierarchical multilevel preconditioner is constructed for an efficient solution of a first kind boundary integral equation with the single layer potential operator discretized by a boundary element method. This technique is based on a hierarchical clustering of all boundary elements as used in fast boundary element methods. This hierarchy is applied to define a sequence of nested boundary element spaces of piecewise constant basis functions as used in the definition of the preconditioning multilevel operator.