Synthesis and Characterization of N-（ 2,3,4,6-Tetra-O-acetyl-β-D-glucopyranosyl） -thiocarbamic-4-hydroxy-benzoyl Hydrazine Dihydrate

Introduction The studies on carbohydrate-containing compoundshave extremely been increased during the last threedecades because these compounds have many interest-ing and useful biological activities besides structuralsupport and energy storing functions[1]. Many nomadicsugars play an important role in biology[2]and many bi-ologically important products have a sugar unit connect-ed with the main structures by means of an atom(O, S,N or C) or a group of atoms[3]. Alarge number of con-formatio…     

含分层损伤复合材料加筋层合板的分层扩展研究

建立了复合材料加筋结构的后屈曲和分层损伤扩展行为的数值模拟方法．基于Mindlin一阶剪切理论和von-Karman大挠度理论的层合板和层合梁单元，提出了含分层损伤复合材料加筋层合板分层扩展行为的有限元分析方法；利用虚裂纹闭合技术计算分层前缘的总能量释放率，并采用总能量释放率准则分层扩展判据，结合自适应网格移动技术，对在压缩载荷作用下的具有不同加筋形式，不同初始分层面积和形状的加筋板结构分层扩展行为进行了数值模拟研究，在分析中还考虑了加筋刚度、位置和分布，分层形状和大小、边界支撑强弱和分层前缘的接触效应对结构分层扩展行为的影响．本所提出的研究方法对工程界关于复合材料结构的设计具有重要意义．     

分次反单本原根

本文给出分次情形的反单本原根SJGG,当群G满足|G|<∞,证明了SJG=SJref=SJG,其中SJref和SJG分别表示反射反单本原根和限制反单本原根.而且讨论了SJG的分次补根.     

TWO LEVEL SCHWARZ METHODS OF MIXED FINITE ELEMENT APPROXIMATION OF BIHARMONIC PROBLEM

In this paper,the two level additive Schwarz algorithm of mixed finite element.dts-cretization of Inharmonic problem is presented,the rate of convergenece is obtained.Moreover,the two level multiplicative Schwarz algorithm is considered.     

不确定条件下多属性决策的比较因素法(英文)

本文针对不确定条件下多属性决策问题,扩展了原有多属性决策的概念,引入了比较因素与次比较因素,获得了其一些代数性质以及相应的定理。在此基础上,给出了不确定条件下多属性决策的比较因素法。     

芳烃混合物的三维荧光光谱的降秩因子分析

本文介绍了降秩因子（ＲＡＦＡ）方法，它是从一个多组分混合物中直接定量计算其中某一组分，而不必知道其他组分的物种及含量的一种定量分析的数学方法。它适用于双线性的数据。本实验首先将荧光分光光度计与外接计算机相连，以获得样品的激发－发射矩阵（ＥＥＭ），再用ＲＡＦＡ方法对蒽，萘，菲，芘，芴，Ｑｕ六种标样的一至五组分的混合物进行定量分析，获得满意的结果。     

低温胁迫下香蕉叶片Chla荧光动力学参量的变化及其品种差异性

低温胁迫下,广东2号香蕉品种和巴西香蕉品种Williams的叶绿素(Chla)荧光动力学参量F_Ⅴ/F_m、ΔF_Ⅴ/F_T以及williams品种的F_IV/F_Ⅴ均呈下降趋势,两个品种的荧光上升半时间T_1/2及广东2号的F_IV/F_Ⅴ呈上升趋势.其中,Williams的F_Ⅴ/F_m、ΔF_Ⅴ/F_T和T_1/2的变化幅度小于广东2号,表明低温胁迫通过抑制光合电子传递速度和PSⅡ无活性中心含量的提高使香蕉叶片PSⅡ原初光能转换效率下降,相同低温对广东2号的影响大于对Williams的影响.F_Ⅴ/F_m和ΔF_Ⅴ/F_T可以作为评价香蕉幼苗抗冷性的物理指标.     

论连通和单连通可裂G_2的A_q(λ)的酉性

设G为一连通,单连通的G2型可裂实李群,K为G的最大紧致子群,g为G的李代数的复化,Aq（λ）为 Knapp在[7]中的定义（g,K）-模.（MAN,σ,υ）表示由[7]中猜测方法确定的Aq（λ）的自然不可约分量的Langlands参数.本文确定了当λ位于弱好区域外时,哪些Langlands商J（MAN,σ,υ）为酉的.     

Partitioning series-parallel multigraphs intoν*-excluding edge covers

We prove that, for any given vertexν* in a series-parallel graph G, its edge set can be partitioned into k= min{k′(G) 1,δ(G)} subsets such that each subset covers all the vertices of G possibly except forν*, whereδ(G) is the minimum degree of G and k′(G) is the edge-connectivity of G. In addition, we show that the results in this paper are best possible and a polynomial time algorithm can be obtained for actually finding such a partition by our proof.     

An explicit formula for the Webster torsion of a pseudo-hermitian manifold and its application to torsion-free hypersurfaces Dedicated to Professor Sheng GONG on the occasion of his 75th birthday

This paper gives an explicit formula for calculating the Webster pseudo torsion for a strictly pseudoconvex pseudo-hermitian hypersurface. As applications, we are able to classify some pseudo torsion-free hypersurfaces, which include real ellipsoids.