线性电路的冲激响应

在线性电路分析中,直接求解线性时变电路的冲激响应一般是很困难的。但是,可带求解冲激响应的问题转化为在一组等效的初始条件下求解零输入响应的问题,关键在于得出这组等效的初始条件。文中介绍了一种求等效初始条件的方法。     

再入机动弹头滚动回路鲁棒姿态控制系统设计

根据经典控制理论,引入姿态角加速度反馈,采用零、极点相消,变增益补偿等设计方法,所设计的再入机动弹头滚动回路姿态控制系统具有良好的快速性、稳定性和很强的鲁棒性。     

材料色散对全固态带隙光纤带内色散的影响

全固态光子带隙光纤已开始用于产生超连续谱,其带隙效应可以控制超连续谱的范围,但是带内的色散特性对于超连续谱的产生有着重要的影响.采用平面波法计算了同一带隙光纤不同阶带隙内的色散曲线和不同带隙光纤同阶带隙内的色散曲线,零色散波长在带内相对位置与带隙位置密切相关,在长波长区域,零色散点位于带隙的短波边;在短波区域,零色散点...     

一种新的柴油机润滑油发射光谱数据综合评价方法

对两台船舶主柴油机润滑油进行了长期监测,应用原子发射光谱仪对采集的36个油样进行了测试。采用基于熵权法的模糊综合评价对各元素进行了权重赋值,并依据权重选取11个元素中的5个主要作用元素进行了数据综合评价,按照正常、注意、警告、异常4个状态对装备磨损状态进行了分类。研究结果表明:所提出的油液原子发射光谱数据综合评价方法能够客观、准确地获取装备磨损状态,其评价结果与实际磨损状态相符,为装备的使用与维护提供了有效的技术依据。     

A search game on a cyclic graph

There is a finite cyclic graph. The hider chooses one of all nodes except the specified one, and he hides an (immobile) object there. At the beginning the seeker is at the specified node. After the seeker chooses an ordering of the nodes except the specified one, he examines each nodes in that order until he finds the object, traveling along edges. It costs an amount when he moves from a node to an adjacent one and also when he checks a node. While the hider wishes to maximize the sum of the traveling costs and the examination costs which are required to find the object, the seeker wishes to minimize it. The problem is modeled as a two‐person zero‐sum game. We solve the game when unit costs (traveling cost + examination cost) have geometrical relations depending on nodes. Then we give properties of optimal strategies of both players. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004.     

一种基于零控脱靶量的滑模末制导律设计

基于零控脱靶量的思想,提出一种能够有效针对大气层再入目标的滑模末制导律.首先,建立纵向平面内的弹目相对运动方程;然后利用扩张状态观测器对目标机动加速度信息进行估计,并对零控脱靶量算法进行分析,提出了制导律的设计思路;接着利用滑模变结构控制理论进行制导律的推导;最后进行仿真分析,仿真结果证明,所设计的制导律能够很好地对目标弹进行拦截,并且指令的跟踪效果也很好,从而验证了算法的有效性.     

The Moral Dimension of “Global Zero”

Regrettably, moral arguments are largely absent from the current debate on nuclear disarmament. Indeed, complementing politico-strategic thinking with ethical categories could significantly strengthen the abolitionist call. To fill the gap, this article analyzes the evolution of the nuclear ethics of the Roman Catholic Church and especially its position on nuclear deterrence. If this strategy was granted interim and strictly conditioned moral acceptance during the Cold War, nuclear deterrence is today increasingly considered ineffective, an obstacle to genuine disarmament, and hence morally unjustifiable. In the new security context, the conditions for the Catholic Church's “interim nuclear ethics” have altered, and nuclear disarmament has become a feasible option and an alternative strategy to deterrence.     

A search game taking account of attributes of searching resources

This article deals with a two‐person zero‐sum game called a search allocation game (SAG), in which a searcher and a target participate as players. The searcher distributes his searching resources in a search space to detect the target. The effect of resources lasts a certain period of time and extends to some areas at a distance from the resources' dropped points. On the other hand, the target moves around in the search space to evade the searcher. In the history of search games, there has been little research covering the durability and reachability of searching resources. This article proposes two linear programming formulations to solve the SAG with durable and reachable resources, and at the same time provide an optimal strategy of distributing searching resources for the searcher and an optimal moving strategy for the target. Using examples, we will analyze the influences of two attributes of resources on optimal strategies. © 2007 Wiley Periodicals, Inc. Naval Research Logistics 2008     

游标卡尺实验中值得注意的几个问题

对游标卡尺实验中普遍存在的问题进行了分析与讨论 ,并给出了合理的解释。     

Weibull型产品的可靠性验证

讨论了Weibull型产品的可靠性验证问题 ,首先分析了Weibull型产品分布参数的无信息验前分布问题 ,利用验前信息可以得到分布参数的验前概率密度函数 ,进而分析了产品的可靠性验证问题 ,顾及了使用方利益和生产方利益。仿真算例表明 ,使用方利益和生产方利益是相互折衷的。