互素多项式在线性变换下的维数特征

给出了一类线性变换多项式的维数特征定理,并通过将该定理应用于矩阵多项式的秩问题,获得或推广了现行相关文献中的许多结果。     

Towards skin polarization characterization using polarimetric technique

Measurement of optical properties of skin is an expanding and growing field of research. Recent studies have shown that the biological tissue, especially skin, changes the polarization state of the incident light. Using this property will enable the study of abnormalities and diseases that alter not only the light intensity but also its polarization state. In this paper we report an experimental study for measuring changes of polarization state of the light scattered from a phantom similar to a sample model of scattering skin. Using the notation of Stokes vector for the polarized light and Mueller matrix for the sample with its polarization properties, we have shown that some elements of the matrix were particularly sensitive to the changes of the polarization-altering physical properties of the scatterers within the phantom.      

空间连杆机构装配构形的建模及求解

提出完全有效元素法并用于建立一类空间连杆机构装配构形问题的统一数学模型;将综合消元法用于确定机构的所有装配构形。实例计算表明,本文理论正确、方法实用新颖、程序运行可靠。     

Young children,gender and the heterosexual matrix

In this paper I consider the adult focus of current mainstream gender theory. I relate this to how the concept of the heterosexual matrix originates in a social contract which excludes children from civil society. I argue that this exclusion is problematic both for theoretical reasons and from the perspective of children themselves. I start by discussing the nature of the heterosexual matrix and its foundations. I consider the implications for participation which arise from being named as a child, how that affects children's attempts to claim participation in civil society, and how this is related to children's naming of themselves as gendered. I then briefly consider the possibility that, because of their exclusion, children might also be considered to be exempt from the heterosexual matrix. However, I argue, there is considerable evidence that children are actively sexual beings who also work hard to claim inclusion in local practices of heterosexuality. I end by suggesting that there are three key reasons for this: that the discourses of normative sexuality provide children with a language to express sexual feelings; that self-insertion in the heterosexual matrix is a way for children to claim rights to participation; and that taking up heterosexual formations is a means whereby children can experience the power of naming themselves as part of the social world.     

一类具有强奇性的矩阵型偏微分方程的正解的存在性

研究矩阵型强奇异偏微分方程 其中,Ω⊂Rⁿ是有界开集,M（x）是定义在Ω上的实对称矩阵,-p<-1,0 < q < 1,λ>0是参数,f（x）∈L¹（Ω）,f（x）>0 a.e.in Ω。证明,如果存在u₀ ∈H₀¹（Ω）满足∫_Ωf（x）|u₀|^1-pdx <+∞,则对任意的λ>0上述方程都有正H₀¹-解,即慢速解。我们注意到,对于奇异方程,古典解即C²（Ω）∩C（Ω）解不一定是H₀¹（Ω）解。     

石墨炉原子吸收直接法测定海水镍和钒

本文研究了海水基体和共存离子对镍和钒的影响,选用酒石酸、乙酸铵分别作为镍和钒的基体改进剂。未加基体改进剂前,海水镍回收率只有77％,钒的测量精度为11％;加人改进剂后均有改善。采用塞曼效应背景校正技术,热解涂层石墨管,建立了石墨炉原子吸收直接测定海水镍和钒的分析方法。镍和钒的特征质量值(mo)分别为8.4pg和17pg;实际检测限:镍为0.25μgL~(-1)和钒为0.41μgL~(-1)。回收率镍为86～110％,钒为88～106％范围。最大相对标准偏差为谋5.5％,钒4.2％。     

次强Hermiter矩阵及其性质

在次Hermiter矩阵定义的基础上给出了次强Hermiter矩阵的概念,利用次Hermiter矩阵的研究方法及性质,推出了次强Hermiter矩阵的一些性质．     

一类实矩阵方程的双对称解

本文讨论了实矩阵方程X^△AX=A（A为非退化实双对称矩阵,X^△为X的双转置矩阵）的非退化解问题,并给出一般解的形式;同时讨论了实矩阵方程石XAX=A的双对称解问题,并给出了一般解的形式．     

新的线性代数教学方法探讨

针对现今线性代数教学中以理论知识为主,轻视实际应用乃至忽视实际应用的现状,提出了与实际应用相结合的课堂授课方法和较大课题引导学习方式。另外,提出了在课堂教学中采用Matlab进行辅助教学,用Matlab丰富快捷的运算和界面来令课堂生动起来。     

n阶行列式的计算方法

通过一些具体的例题介绍了n阶行列式计算的几种常用而且行之有效的方法