WVk([a,b],λ)的一致收敛定理

本文在已有研究结果的基础上，讨论了叙列空间上弱k级有界变差函数的一致收敛问题，得到了若干有关一致收敛的等价条件。     

均匀设计法用于提取普通念珠藻粗多糖条件优选的研究

运用均匀设计法研究从普通念珠藻中提取多糖的最佳工艺条件 :在提取温度为 98℃ ,提取时间为 3 .8小时 ,多糖的提高率最高。在实验范围内料液比无影响     

微乳液对锌──双硫腙的增敏作用及增敏条件优选研究

该文用均匀设计的方法，在微乳液体系中（吐温／n－正丁醇／n－正已烷／水）通过对Zn（Ⅱ）－H2Dz的光度分析，得到最佳增敏条件。结果表明，与水体系比较，该微乳液体系有较好的增敏作用，测定条件更为宽容，测定结果令人满意。     

关于Leibniz型函数项级数的一致收敛判别法

本文给出了Leibniz型函数项级数,并且应用Dini定理及Dirichlet定理证明是一致收敛的,它可作为Dirichlet定理的推广,是判别函数项级数一致收敛性的又一行之有效的新方法。     

凸多边形区域中的有限元方量校正

对凸多边形区域中的线性椭圆蛩方程.采用二次元插值对线性有限元解进行方量校正.使解的精度提高了二阶.     

受轴向均布载荷的压弯组合梁的计算

本文以受轴向、横向均布载荷且两端为固定饺支的组合梁为例,介绍如何用能量法来求解这类问题;讨论轴向均布载荷对弯矩放大系数的影响,并给出何时应考虑轴向压力对弯矩影响的近似判别式。     

UNIFORM PERSISTENCE IN DISCRETE SEMIDYNAMICAL SYSTEM AND ITS APPLICATION

ＵＮＩＦＯＲＭＰＥＲＳＩＳＴＥＮＣＥＩＮＤＩＳＣＲＥＴＥＳＥＭＩＤＹＮＡＭＩＣＡＬＳＹＳＴＥＭＡＮＤＩＴＳＡＰＰＬＩＣＡＴＩＯＮ￥ＷＡＮＧＷｅｎｄｉ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＳｏｕｔｈｗｅｓｔＮｏｒｍａｌＵｎｉｖｅｒｓｉｔｙ，...     

The generation of random ultrametric matrices representing dendrograms

Many methods and algorithms to generate random trees of many kinds have been proposed in the literature. No procedure exists however for the generation of dendrograms with randomized fusion levels. Randomized dendrograms can be obtained by randomizing the associated cophenetic matrix. Two algorithms are described. The first one generates completely random dendrograms, i.e., trees with a random topology, random fusion level values, and random assignment of the labels. The second algorithm uses a double-permutation procedure to randomize a given dendrogram; it proceeds by randomization of the fixed fusion levels, instead of using random fusion level values. A proof is presented that the double-permutation procedure is a Uniform Random Generation Algorithmsensu Furnas (1984), and a complete example is given. This work was supported by NSERC Grant No. A7738 to P. Legendre and by a NSERC scholarship to F.-J. Lapointe.     

Porous SiC ceramics fabricated by quick freeze casting and solid state sintering

Porous SiC ceramics with uniform microstructure were fabricated by quick freezing in liquid nitrogen and solid state sintering.Poly(vinyl alcohol)(PVA) was added as binder and pore morphology controller in this work.The microstructure and mechanical properties of porous SiC ceramics could be controlled by the composition of the aqueous slurries.Both solid content of the slurries and PVA content impacted on the pore structures and mechanical properties of the porous SiC ceramics.The solid content of slurries and PVA content varied from 60 to 67.5 wt%and 2-6 wt%,respectively.Besides,the grain morphology of ceramics was also tailored by changing the sintering temperature from 2050 to 2150 ℃.Porous SiC ceramics with an average porosity of 42.72%,flexural strength of 59.28 MPa were obtained at 2150 ℃ from 67.5 wt% slurries with 2 wt% PVA.     

集值映射空间各种收敛拓扑的统一描述

文献[1]首次刻画了集值映射空间中关于各种收敛性的网的极限类及与之对应的各种邻近结构,本文则进一步探计这些收敛性能否确定与之相伴的拓扑。首先,我们借助一致空间的一致覆盖族定义了一致空间中的(*)包含动算并应用它给出了建立集值映射空间中各种收敛概念及其相伴拓扑的一种统一的框架。其次,我们具体论述了集值映射空间中十二种收敛性的相伴拓扑。最后,我们指出上述拓扑中的四种相伴拓扑均可分别重合于集值映射空间的某个一致拓扑。