Epoxy Resin-Photopolymer Composite with None-Shrinkage for Volume Holography

A novel photopolymer storage medium for holographic storage is presented. In particular, the refractive in-dex of the monomer methyl methacrylate is much lower than that of the binder epoxy resin solidified by m-xylylenediamine, and the material can be developed into samples with dimension stability and high optical quality and thickness of several millimetres or more. Some none-polymeric macromolecule impurity is uniformly mixed into the medium to aid the monomer diffusing and to enhance the diffraction efficiency. A holographic recording medium of 0.8 mm thickness has been fabricated, and relative theoretical analysis and experiments are presented.     

EXISTENCE OF STOCHASTIC EQUILIBRIUM WITH INCOMPLETE FINANCIAL MARKETS

This paper analyzes the aritrage-tree security markets and the general equilibrium ex-istence problem for a stochastic economy with incomplete financial markets. Information structure is given by an event tree. This paper restricts attention to puraly financial securities. It isassume that trading takes place in the sequence of spot markets and futures markets for securi-ties payable in units of account. Unlimited short-selling in securities is allowed. Financial markets may be incomplete, some consumption streams may be impossible to obtain by any tradingstrategy. Securities may be individually precluded from trade at arbitrary states and dates. Thesecurity price process is arbitrage-free the dividend process if and only if there exists a stochaticstate price (present value) process : the present value of the security prices at every vertex isthe present value of their dividend and capital values over the set of immediate successors ; thecurrent value of each security at every vertex is the present value of its future dividend streamover all succeeding vertices. The existence of such an equilibrium is proved under the followingcondition: continuous, weakly convex, strictly monotone and complete preferences, strictlypositive endowmenta and dividends processes.     

关于稳定调和映照的一点注记

§1 引言设 f 是从紧致 Riemann 流形 M 到 Riemann 流形 N 的一个光滑映照.映照 f 的能量积分定义为E(f)=1/2 integral from M‖df‖~2dV_M.如果映照 f 是能量泛函 E 的一个临界点,则称 f 为从 M 到 N 的调和映照.调和映照f 称为稳定的如果其二阶变分非负.设 S~n 表示 n 维欧氏球面.我们知道不存在从任意紧致 Riemann 流形到 S~n 或从 S~n 到任意 Riemann 流形的非常值稳定调和映照(n≥3).文献[3]、[4]、[5]和[6]进一     

南极中国长城站地区西湖沉积物的地球化学行为与环境

本文对取自长城站区西湖水下沉积物260cm岩芯采用中子活化等方法分析得出:湖区周边的新生代火山岩构成了西湖沉积物的主要物源.粘土粒级中元素有明显的化学分异作用.沉积物中Cs/Rb,Br/Cl,La/Yb,CaCO_3及粘粒中阳离子代换量的变化表明3.6ka B.P.以来,气候存在温和—寒冷—温和的变化,反映该区冰盖进退的历史.     

一类高阶非线性差分方程的振动性和稳定性

建立了非线性差分方程所有正解关于其正平衡点振动的充要条件，部分地解决了文[1]中的一个公开问题，同时还获得了方程的正平衡点渐近稳定的一个充分性判据．     

光电预偏置激光脉冲稳幅器性能研究

 分析了由普克尔斯盒与偏振器组成的预加动态偏置电压光电可变透过率装置对调Q激光脉冲幅度的稳定作用;着重阐述了装置的参数设计,对装置的数值模拟计算表明该装 置可将激光脉冲的相对波动由10%减小到1%以下;用该装置进行稳幅实验,得到与设计分析相 符的结果。     

基于插值的全矢量有限差分法求解阶跃光波导本征模式

给出了一种适合求解阶跃折射率分布光波导本征模式的全矢量有限差分法.该方法充分考虑了电场分量在折射率分布跃变处的不连续性, 在拉格朗日插值的基础上得到了一种精度较高的差分格式.为了验证其有效性,对一种典型结构、折射率阶跃分布的波导作了计算,并与其它方法的结果作了比较.最后对不理想刻蚀情况做了模拟计算.     

基于FA-DEA聚类的模式分析方法及在我国软件园研究中的应用

模式分析方法日益成为现代经济管理研究的主流方法之一,但是目前关于模式分析的结构化方法的研究还不多见.本文提出了基于FA-DEA聚类的模式研究结构化方法,这个方法区别于以往文献的是采用了混合聚类方法,综合运用关键因素的绝对量信息和效率的相对量信息.基于上述方法,本文确定了我国软件园发展的三种发展模式.并对三个模式的条件、特征以及它们之间的分界与演进做了详细的描述.最后,给出了若干建议.