Electronic Properties of Red P-Type Tl2S5 Single Crystals

Single crystals of red Tl2S5 were prepared by a special modified vertical Bridgman and Stockbarger technique.This growth was performed in our laboratory. The influences of temperature on the electrical conductivity, Hall mobility, carrier concentration, and thermoelectric power (TEP) were carried out in the temperature range 277-413K. Throughout these measurements, various physical parameters such as effective mass of charge carriers,carrier mobility, diffusion coefficient, and the relaxation time for both majority and minority carriers were found.     

氘氚化锂分解残渣中微量氚的回收

氘作同位素交换气对除氚后的新鲜氘氚化锂残渣[主要成分是硅锂化合物和二氧化硅，渣中含氚约为0．9443mg／g(渣)]中的微量氚进行氚的计量与回收，为氘氚化锂残渣中氚的回收提供技术支持。     

关于解椭圆型问题的多子域D-N交替算法

构造一个求解椭圆型边值问题的多子域D—N交替算法，导出对应的容度方程和等价的迭代法，证明算法的收敛性。     

马科维兹资产组合选择模型的旋转算法

提出线性不等式组的一种旋转算法，并用其求解马科维兹资产组合选择模型，此算法每次迭代约需n^2次乘法和加法，其中n是模型中变量的数目，在微机上运行Delphi程序的实验结果表明，从上海和深圳股市1072支股票70期周末收盘价计算出20个最优投资组合仅需314次迭代和45s。     

THE COUPLING OF NATURAL BOUNDARY ELEMENT AND FINITE ELEMENT METHOD FOR 2D HYPERBOLIC EQUATIONS

In this paper, we investigate the coupling of natural boundary element and finite element methods of exterior initial boundary value problems for hyperbolic equations. The governing equation is first discretized in time, leading to a time-step scheme, where an exterior elliptic problem has to be solved in each time step. Second, a circular artificial boundary FR consisting of a circle of radius R is introduced, the original problem in an unbounded domain is transformed into the nonlocal boundary value problem in abounded subdomain. And the natural integral equation and the Poisson integral formula are obtained in the infinite domainΩ2 outside circle of radius R. The coupled variational formulation is given. Only the function itself, not its normal derivative at artificial boundary ΓR, appears in the variational equation, so that the unknown numbers are reducedand the boundary element stiffness matrix has a few different elements. Such a coupled method is superior to the one based on direct boundary element method. This paper discusses finite element discretization for variational problem and its corresponding numerical technique, and the convergence for the numerical solutions. Finally, the numerical example is presented to illustrate feasibility and efficiency of this method.     

溶胶凝胶软石印法制备Zn_2SiO_4∶Mn图案化薄膜及其发光性能的研究

采用溶胶 凝胶法制备了Zn2SiO4∶Mn薄膜并结合毛细管微模板技术实现了薄膜的图案化,利用X射线衍射(XRD),原子力显微镜,光学显微镜,发光光谱等手段对Zn2SiO4∶Mn的结晶过程、发光性质进行了研究。XRD结果表明,溶胶 凝胶法合成的样品在800℃时已开始结晶,在1000℃时可得到纯相的Zn2SiO4∶Mn,这比传统的固相法的烧结温度低150℃。Zn2SiO4∶Mn薄膜的激发光谱在220nm和280nm之间有一个强的吸收峰,峰值位于248nm,发射光谱的最大值位于522nm,为绿光发射。从原子力显微镜照片可知组成薄膜的粒子比较均匀,其平均直径为220nm。我们获得了四种图案化宽度,分别是5,10,20,50μm。光学显微镜的结果表明,图案薄膜烧结后相对于烧结前有10%～20%的收缩。     

非因子化方法研究D~+→ ■~0K~+衰变(英文)

在领头阶和αs 修正阶 ,用QCD因子化方法 ,并对它的软胶子效应用光锥QCD求和规则分析D+ → K0 K+ 衰变过程 ,我们分析发现朴素因子化方法的结果远离实验结果 ,QCD因子化方法结果靠近实验结果 ,但是 ,在QCD因子化方法中 ,若考虑软胶子效应 ,其结果与实验结果相一致 .另外 ,计算发现 ,软胶子效应在该衰变道中有相当大的贡献 ,因此不能被忽略     

氧化硅气凝胶的超临界制备及纳米结构

简要介绍了用溶胶－凝胶法制备新型功能材料氧化硅气凝胶的方法，着重阐述了氧化硅气凝胶的各种干燥过程对其纳米结构的影响，说明了超临界干燥工艺在保持气凝胶的纳米多孔结构方面的突出重要地位，同时，用比表面积测量，扫描电镜，小角Ｘ射线菜射等研究了这种轻质纳米多孔非晶固态材料的结构特性，介绍了这种材料的应用前景。     

金属颗粒-半导体膜Cu:CdS的制备及结构研究

利用磁控溅射产生金属Cu团簇，同时蒸发半导体介质CdS，将Cu团簇包埋在CdS介质中，制备出金属颗粒 半导体膜．团簇大小可通过改变溅射气压控制．用TEM研究了嵌埋团簇的结构．分析表明：CdS很好地包埋了Cu团簇，都呈多晶结构；团簇尺寸在5—20nm，Cu晶格发生了膨胀，膨胀量在7%左右 关键词：     

一道高考题的探究在棱柱中的推广

文[1]作者由2005年湖南省高考数学试题（理10）定义了多边形面积三角形化定比分点及相关概念并得出了一些性质：