POROSITY CALCULATION OFMIXTURES OF FIBROUS PARTICLES

The initial forming of fiber blend to high green density, i.e. the packing of fibrous particles, is important to the reinforcement of composite materials. It is very useful to develop a general predictive method for the optimum selection of particle mixtures for the property control of ceramic or composite products. This paper presents such a mathematical model developed on the basis of the similarity analysis between the spherical and non-spherical particle packings and assesses its applicability to the packing of fibrous particles with discrete and/or continuous length distributions. The results indicate that the model can predict this packing system well and hence provide an effective way to solve various packing problems in the composite materials processing.     

Cr^4＋：YAG可饱和吸收特性测量

测量了Cr4+:YAG材料的可饱和吸收特性,用多种数据分析方法处理了实验结果,Cr4+:YAG的基态吸收截面σgs=11×10-19cm2,激发态吸收截面σes=1.2×10-19cm2。     

论设计无对称中心的有机功能晶体

本文仅当前设计无对中心的机功能晶体，作了简要地论述。     

闭排队网络中性能势与无穷小实现因子之间的关系

In this paper,the concept of the infinitesimal realization factor is extended to the parameter-dependent performance functions in closed queueing networks. Then the concepts of realization matrix (its elements are called realization factors) and performance potential are introduced,and the relations between infinitesimal realization factors and these two quantities are discussed. This provides a united framework for both IPA and non IPA approaches. Finally,another physical meaning of the service rate is given.     

JY70P等离子体光量计通讯功能的开发

最近我们从法国引进了一台等离子体光量计。本文介绍了在该仪器上开发通讯功能的一种方法，在仪器内部手稿接口板，接上数据传输线，编制通讯软件并使其纳入到原系统软件模块中去，从而完成了异型机之间的PASCAL操作系统下的通讯功能的开发任务。     

热电材料研究进展

在介绍热电材料制冷工作原理，分析热电材料优值系数的基础上，介绍了300K以下热电材料的研究进展，分析了热电材料的制冷特点、现状和应用前景．     

对一道高考压轴题的探讨

历年高考都十分重视对考生的后继学习潜能以及研究素质的考查，命题越来越科学合理、新颖巧妙．其中，以某些高等数学知识为背景材料设计而成的高考题，尤其为广大中学数学教师所津津乐道．新课程引入导数后，给我们研发具有高等数学背景的数学试题，提供了更广阔的空间．