混合泵浦两段级联掺铒光纤放大器实验研究

基于内插隔离－耦合环两段级联新结构，采用９８０ｎｍ与１４８０ｎｍ激光二极管混合泵浦方式，研制出在１．５５μｍ波段兼具高增益，大功率，低噪声九特性的掺铒光纤放大器。     

Communication Scheme via Cascade Chaotic Systems

A new chaotic communication scheme is constructed. Different from the existing literature, cascade chaotic systems are employed. Two cascade modes are considered. First, we investigate the input to state cascade mode; cascade systems between different kinds of chaotic systems are considered. Then the parameter cascade case of chaotic system is studied. Under the different cases, the corresponding receivers are designed, which can succeed in recovering the former emitted signal. Simulations are performed to verify the validity of the proposed main results.     

THE CHECK OF OPTIMALITY CONDITIONS IN NONSMOOTH PROGRAMMING

In this paper,the geometrical meaning of two basic optimality conditions for a class of common cases in nonsnaooth programming is exposed. Thus it makes the check of optimalityconditions for this class of nonsmooth programming problem much easier.     

二阶NFDE零解的稳定性

本给出了二阶中立型微分方程     

分析（E1）类的广义R—H—C边值可解性

本通过研究一类满足边界条件的二阶椭圆复线性方程组的广义混合型边值问题，提出了其可解条件，并就其解给出了明确的解析式．     

二阶脉冲微方程三点边值问题解的存在性

We study the existence of solutions to the second order three-point boundary value problem: where 0 <η< 1, α∈R, and f : [0, 1]×R×R→R, Ii: R×R→R, Ji : R×R→R(i=1,2,…k) are continuous. Our results is new and different from previous results. In particular, we obtain the Green function of the problem, which makes the problem simpler.     

瞬变流摩阻计算及摩阻对水力瞬变的影响

摩阻损失的精确计算对于长输管道的水力瞬变分析是很重要的一个环节、过去为减少计算工作量，采用固定摩阻系数和流量一阶近似法计算瞬交流摩阻，精度有限．本跟踪液流流态变化，采用变摩阻系数和流量二阶插值法计算瞬交流摩阻，提高了摩阻计算精度．同时，从理论上分析了管道摩阻对水力瞬变的影响，澄清了一些模糊认识．     

二阶曲线射影仿射分类的合同变换法

二阶曲线的射影(仿射)分类是指:凡在射影(仿射)变换下互为对应的二阶曲线归为一类,分类常用方法是在射影(仿影)平面上选取适当的坐标系化简方程,其中涉及到高等几何的概念较多,分析与解题的过程也较为繁杂。本文避开对坐标三点形的选择,对二阶曲线的系数矩阵施以合同变换,达到分类的目的。     

二阶抽样中二级单位总样本量的分配

本文讨论了二阶抽样中一阶抽样为不等概率抽样、二阶抽样为简单随机抽样时,二级单位总样本量的几种分配方案。给出各种分配方案下总体总值的Horvitz-Thompson估计量的方差。并加以比较,最后给出最优分配方案。