一种新型光带通滤波器的设计

设计一新颖的光纤环路作为光带通滤波器,它由３ｄＢ定向耦合器和光纤光栅构成,并用传输矩阵方法对其输入、输出特性进行了理论分析,表明是一种性能优异的带通滤波器,在光通信等领域有着良好的应用前景．     

Are non‐lethal weapons a viable military option to strengthen the hearts and minds approach in Afghanistan?

Commanders of the International Security Assistance Force (ISAF) have repeatedly stressed the hearts and minds approach in Afghanistan, in saying that the human terrain is decisive for a successful outcome of the mission. Avoidance of civilian casualties is considered of strategic importance, and by nature highly dependent on the management of tactical level Escalation of Force (EoF) situations. Non‐lethal weapons (NLWs) are expected to enable tactical commanders to avoid innocent civilian casualties in such situations. This article considers a selected NLW on its potential to accomplish this requirement. It uses a defence technology assessment approach to analyse EoF situations experienced by Dutch ISAF forces in which the NLW is inserted. The analysis demonstrates that a range of contextual factors in the Afghanistan high‐risk environment tend to narrow down the window of opportunity for the NLW to help defuse the risk of unintended civil casualties.     

论公安现役本科院校基础课程设置

公安现役本科院校的基础课程,是根据边、消、警部队人才基本素质全面发展的培养目标要求而设定的。它既要满足国民高等学历教育的需要,又要适应部队人才需要和发展的要求,有其明显的职业指向性。因此,公安现役本科院校的基础课设置必须把公安现役高等教育的职业化特色与普通高等教育规范化要求有机结合,形成具有公安现役教育特色的基础课程体系。     

基于遗传算法的观察所优化配置

文章研究了三维地形中的观察所优化配置问题,结合观察所实际情况,给出了利用遗传算法进行观察所优化的计算方法,并编制了计算机应用程序.计算机模拟实验表明,文中采用的算法能综合考虑多种因素,所得结果合理、准确,并且具有较高的效率.     

A branch and bound algorithm for the minimum storage‐time sequencing problem

The minimum storage‐time sequencing problem generalizes many well‐known problems in combinatorial optimization, such as the directed linear arrangement and the problem of minimizing the weighted sum of completion times, subject to precedence constraints on a single processor. In this paper we propose a new lower bound, based on a Lagrangian relaxation, which can be computed very efficiently. To improve upon this lower bound, we employ a bundle optimization algorithm. We also show that the best bound obtainable by this approach equals the one obtainable from the linear relaxation computed on a formulation whose first Chvàtal closure equals the convex hull of all the integer solutions of the problem. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 313–331, 2001     

反射焦散线方法中光路放大因子λ的讨论

讨论了反射焦散线方法中,反射面的凸性与光路放大因子λ之间的关系,显示了焦散线的特性。     

装甲车新型大视场高潜望镜的研制

从设计角度论述了装甲车新型大视场高潜望镜的研制过程,重点分析了光学系统设计和结构设计。     

On matched active redundancy allocation for coherent systems with statistically dependent component lifetimes

This study addresses the allocation of matched active redundancy components to coherent systems with base components having statistically dependent lifetimes. We consider base component lifetimes and redundancy component lifetimes which are both stochastic arrangement monotone with respect to a pair of components given the lifetimes of the other components. In this context, allocating a more reliable redundancy component to the weaker base component is shown to incur a stochastically larger system lifetime. Numerical examples are presented as an illustration of the theoretical results.     

天基光学短弧观测约束域的粒子群优化定轨方法

针对空间目标定轨问题,提出一种利用两段天基光学短弧观测数据的粒子群优化定轨新算法。在介绍天基光学短弧观测测量帧集、测量约束域及目标函数构造的基础上,为解决已有的基于网格搜索思想寻优的算法存在的多解、局部最优解及运算量过大等问题,提出了一种利用粒子群优化算法在约束域内对目标函数值寻优达到定轨目的的新算法。对算法的性能进行了仿真验证。多次仿真结果表明:该算法大大降低了计算量,且有效地解决了目标函数多解和局部最优解问题,对目标定轨的精度与定轨算法的克拉美罗下限接近。     

双浮体波浪能转换装置中重心布置对波浪能吸收影响分析

提出一种基于横摇运动的双浮体波浪能转换装置,利用水面浮体与水下浮体之间的相对横摇运动实现对波浪能的吸收。在保持水下浮体稳定的前提下,水面浮体的横摇运动决定了整个装置对波浪能吸收情况。水面浮体的横摇运动受其横摇固有频率的影响,主要是重心布置。为了合理选择水面浮体的重心位置,采用数值分析的方法对箱型浮体在长峰不规则波下的工作情况进行分析,讨论重心布置对波浪能吸收的影响以及对PTO参数选择的影响。结果表明,重心的布置可改变波浪能吸收的频段,重心布置越低,可吸收的波浪能频段越广,越有利于波浪能的吸收。