SOME GREEDY t-INTERSECTING FAMILIES OF FINITE SEQUENCES

ＳＯＭＥＧＲＥＥＤＹｔ－ＩＮＴＥＲＳＥＣＴＩＮＧＦＡＭＩＬＩＥＳＯＦＦＩＮＩＴＥＳＥＱＵＥＮＣＥＳ￥ＷＵＳＨＩＱＵＡＮ（巫世权）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＮａｔｉｏｎａｌＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌｏｇｙ，Ｃｈａｎｇ...     

关于热传导－对流问题的有限元方法分析

关于热传导－对流问题的有限元方法分析沈树民（苏州大学）ＴＨＥＦＩＮＩＴＥＥＬＥＭＥＮＴＡＮＡＬＹＳＥＳＦＯＲＴＨＥＣＯＮＤＵＣＴＩＯＮ－ＣＯＮＶＥＣＴＩＯＮＰＲＯＢＬＥＭＳ￥ＳｈｅｎＳｈｕ－ｍｉｎ（ＳｕｚｈｏｕＵｎｉｖｅｒｓｉｔｙ）Ａｂｓｔｒａｃｔ：...     

关于热传导－对流问题的有限元方法分析

关于热传导－对流问题的有限元方法分析沈树民（苏州大学）ＴＨＥＦＩＮＩＴＥＥＬＥＭＥＮＴＡＮＡＬＹＳＥＳＦＯＲＴＨＥＣＯＮＤＵＣＴＩＯＮ－ＣＯＮＶＥＣＴＩＯＮＰＲＯＢＬＥＭＳ￥ＳｈｅｎＳｈｕ－ｍｉｎ（ＳｕｚｈｏｕＵｎｉｖｅｒｓｉｔｙ）Ａｂｓｔｒａｃｔ：...     

SOME KINDS OF LIAPUNOV FUNCTIONAL IN STABILITY THEORY OF RFDE

ＳＯＭＥＫＩＮＤＳＯＦＬＩＡＰＵＮＯＶＦＵＮＣＴＩＯＮＡＬＩＮＳＴＡＢＩＬＩＴＹＴＨＥＯＲＹＯＦＲＦＤＥＤＵＸＵＥＴＡＮＧ（杜雪堂）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＨｕｎａｎＮｏｒｍａｌＵｎｉｖｅｒｓｉｔｙ，Ｃｈａｎｇｓｈａ４１００...     

Finite difference schemes of the nonlinear pseudo-parabolic system

ＦＩＮＩＴＥＤＩＦＦＥＲＥＮＣＥＳＣＨＥＭＥＳＯＦＴＨＥＮＯＮＬＩＮＥＡＲＰＳＥＵＤＯ－ＰＡＲＡＢＯＬＩＣＳＹＳＴＥＭＤＵＭＩＮＧＳＨＥＮＧ（杜明笙）（ＩｎｓｔｉｔｕｔｅｏｆＡｐｐｌｉｅｄＰｈｙｓｉｃｓａｎｄＣｏｍｐｕｔａｔｉｏｎａｌＭａｔｈｅｍａｔ...     

A CRITERION OF RECURRENCE FOR BIRTH－DEATH CHAINS OF ORDER 2 AND RELATED PROBLEMS IN RANDOM ENVIRONMENT

ＡＣＲＩＴＥＲＩＯＮＯＦＲＥＣＵＲＲＥＮＣＥＦＯＲＢＩＲＴＨ－ＤＥＡＴＨＣＨＡＩＮＳＯＦＯＲＤＥＲ２ＡＮＤＲＥＬＡＴＥＤＰＲＯＢＬＥＭＳＩＮＲＡＮＤＯＭＥＮＶＩＲＯＮＭＥＮＴＤｉｎｇＷａｎｄｉｎｇ（丁万鼎）ＷａｎｇＲｏｎｇｍｉｎｇ（汪荣明）（Ｄｅｐｔ...     

无界区域非重叠区域分解算法的离散化及其收敛性

无界区域非重叠区域分解算法的离散化及其收敛性余德浩（中国科学院计算数学与科学工程计算研究所）ＤＩＳＣＲＥＴＩＺＡＴＩＯＮＯＦＮＯＮ－ＯＶＥＲＬＡＰＰＩＮＧＤＯＭＡＩＮＤＥＣＯＭＰＯＳＩＴＩＯＮＭＥＴＨＯＤＦＯＲＵＮＢＯＵＮＤＥＤＤＯＭＡＩＮＳＡＮＤＩ...     

无界区域非重叠区域分解算法的离散化及其收敛性

无界区域非重叠区域分解算法的离散化及其收敛性余德浩（中国科学院计算数学与科学工程计算研究所）ＤＩＳＣＲＥＴＩＺＡＴＩＯＮＯＦＮＯＮ－ＯＶＥＲＬＡＰＰＩＮＧＤＯＭＡＩＮＤＥＣＯＭＰＯＳＩＴＩＯＮＭＥＴＨＯＤＦＯＲＵＮＢＯＵＮＤＥＤＤＯＭＡＩＮＳＡＮＤＩ...     

USING FINITE GEOMETRIES TO CONSTRUCT 3-PBIB(2) DESIGNS AND 3-DESIGNS

ＵＳＩＮＧＦＩＮＩＴＥＧＥＯＭＥＴＲＩＥＳＴＯＣＯＮＳＴＲＵＣＴ３－ＰＢＩＢ（２）ＤＥＳＩＧＮＳＡＮＤ３－ＤＥＳＩＧＮＳ￥ＹＡＮＧＢＥＮＦＵ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＣｈｅｎｇｄｕＴｅａｃｈｅｒｓＣｏｌｌｅｇｅ，Ｃｈｅｎｇｄｕ...     

一类抛物－椭圆耦合方程组混合初边值问题的二阶收敛差分格式Ⅰ

一类抛物－椭圆耦合方程组混合初边值问题的二阶收敛差分格式Ⅰ孙志忠（东南大学数学力学系）ＡＳＥＣＯＮＤ－ＯＲＤＥＲＤＩＦＦＥＲＥＮＣＥＳＣＨＥＭＥＦＯＲＴＨＥＭＩＸＥＤＩＮＩＴＩＡＬ－ＢＯＵＮＤＡＲＹＶＡＬＵＥＰＲＯＢＬＥＭＯＦＡＣＬＡＳＳＯＦＰＡＲＡ...     

Quasi-analytical solution of two-dimensional Helmholtz equation

The two-dimensional Helmholtz differential equation governs vibrational problems for a thin membrane and is therefore well studied. Analytical solutions are limited to particular domain shapes, so that in general numerical methods are used when an arbitrary domain is considered. In this paper, a quasi-analytical solution is proposed, suitable to be applied to an arbitrary domain shape. Concretely, the Helmholtz equation is transformed to account for a conformal map between the shape of the physical domain and the unit disk as canonical domain. This way, the transformed Helmholtz equation is solved exploiting well known analytical solutions for a circular domain and the solution in the physical domain is obtained by applying the conformal map. The quasi-analytical approach is compared to analytical solutions for the case of a circular, elliptic and squared domain.     

Semiring and Semimodule Issues in MV-Algebras

It is known that an atomic right LCM domain need not be a UFD but is a projectivity-UFD if it is also modular. This paper studies a slightly weaker and easier condition, the RAMP (acronym for the property in the title) , which also ensures that an atomic right LCM domain will be a projectivity-UFD. Among other things it is shown that in an atomic LCM domain, modularity is equivalent to the pair RAMP and LAMP (the left-right analog of RAMP). This result is then used to show that an atomic LCM domain with conjugation is modular. An example is given of an atomic LCM domain that has neither the RAMP nor the LAMP. All rings are not-necessarily commutative integral domains. Recall that an atomic ring is one in which every nonzero nonunit is a product of atoms (i.e. irreducibles) . A ring R is a right LCM domain if for any two elements a and b in R, aR ∩ bR is a principal right ideal. A right LCM domain need not be a left LCM domain [3] . If a ring has both properties it is called an LCM domain. It Is known (see Example 2 below) that, unlike the commutative case, an atomic right LCM domain need not be a UFD (unique factorization domain). In [1] it is shown that if the ring is also modular then it is a projectivity-UFD (definition of the latter recalled below)     

On the Ascent of Properties Related to Unique Factorization Domains

In this article, we develop equivalent conditions for a certain class of monoidal transform to inherit either the property of being a completely integrally closed domain that satisfies the ascending chain condition on principal ideals, the property of being a Mori domain, the property of being a Krull domain, or the property of being a unique factorization domain, respectively. Such a class of monoidal transform is given in terms of an (analytically) independent set that forms a prime ideal in the base domain. Characterizations are provided illustrating the necessity of the “prime ideal” hypothesis when the base domain is a Noetherian unique factorization domain.     

拟共形映射和弱John域

作为John域的推广,本文定义了弱John域,并讨论了弱John域与拟圆、弱John域与拟共形 映射之间的关系,得到(1)若(?)。中的Jordan域D和它的外部 均是弱John域,则D 是拟圆;(2)R2中的弱John域是拟共不变的;(3)R2中的有界拟圆必是弱John域．最后构造例子 说明R2中的无界拟圆不一定是弱John域．     

The boundary integral method for the steady rotating Navier–Stokes equations in exterior domain (I): the existence of solution

In this paper, we apply the boundary integral method to the steady rotating Navier–Stokes equations in exterior domain. Introducing some open ball which decomposes the exterior domain into a finite domain and a infinite domain, we obtain a coupled problem by the steady rotating Navier–Stokes equations in finite domain and a boundary integral equation without using the artificial boundary condition. For the coupled problem, we show the existence of solution in a convex set.     

An improvement on geometrical parameterizations by transfinite maps

We present a method to generate a non-affine transfinite map from a given reference domain to a family of deformed domains. The map is a generalization of the Gordon–Hall transfinite interpolation approach. It is defined globally over the reference domain. Once we have computed some functions over the reference domain, the map can be generated by knowing the parametric expressions of the boundaries of the deformed domain. Being able to define a suitable map from a reference domain to a desired deformation is useful for the management of parameterized geometries.     

Singularities of the structure of two-sided ideals of a domain of elementary divisors

We prove that, in a domain of elementary divisors, the intersection of all nontrivial two-sided ideals is equal to zero. We also show that a Bézout domain with finitely many two-sided ideals is a domain of elementary divisors if and only if it is a 2-simple Bézout domain.     

等腰梯形域内两点间平均距离

本文研究了凸域内两点间平均距离的问题.利用广义支持函数和凸域的弦幂积分的方法,获得了计算凸域内两点间平均距离的一般公式,并将公式推广到等腰梯形域,得出了等腰梯形域内两点间平均距离的计算结果.     

Hyperbolic metric,curvature of geodesics and hyperbolic discs in hyperbolic plane domains

The purpose of this paper is to investigate the relations among some geometric quantities defined for every hyperbolic plane domain of any connectivity, each of which measures, in some sense, how much the domain deviates either from a disc, convex domain, or simply connected domain on one hand, or a punctured domain on the other hand. Supported by the Landau Center for Mathematical Research in Analysis.     

拟Z-代数domain

基于一般子集系统Z,引入拟Z-代数domain的概念,研究了拟Z-代数domain的一些映射性质,并讨论了拟Z-代数domain与拟Z-连续domain之间的关系及拟Z-代数domain的乘积。