超空间上连续函数的存在性

本文对[1]中二个未曾解决的问题作了较详细的研究,并以定理3和定理4对它们作出了圆满的解答;同时,得到一些有意义的重要结论。     

海用跟踪雷达轴线角速度测量

讨论了一种伺服设计方案的雷达轴线角速度的测量方法。给出了三个不同的测量点,并说明在稳态条件下,从这三个点测量到的结果都可当作目标视线角速度,且误差不大。最后还给出了测量值的暂态计算机模拟结果。     

紊流时输油管道油流静电带电计算研究

对紊流条件下输油管道内油流静电带电的计算进行了研究。在合理简化紊流扩散系数和油流速度的基础上,推导出油内有关油流带电的电荷输运方程的解析解,并且根据该解析解导出了冲流电流计算公式。该计算公式同时适用于所有电导率范围内液体介质冲流电流的计算。最后利用文中推出的计算公式对一实验油道的油流带电进行了计算,结果显示公式得到的值和实验值非常吻合。     

惯导系统动基座对准精度评估方法

弹载惯性制导系统空中对准是机载战术导弹发射前必须完成的任务,其对准精度直接影响导弹系统的制导精度。利用最优平滑技术对弹载惯导系统传递对准效果进行评估,是分析导弹系统的战术性能和惯导系统自身器件性能的有效方法。Rauch-Tung-Striebel(1965)提出了固定区间平滑算法,Meditch(1967)提出了固定点平滑算法;Bierman(1983)、Watamabe(1989)等许多学者对RTS算法提出了改进方法,这些方法在保证平滑算法中数值的稳定性和提高计算效率方面有了明显改善。针对固定区间平滑算法所适应的对象,分析了这类平滑算法的特点,提出了RTS固定区间平滑算法的改进方法;结合弹载惯性制导系统传递对准效果评估,进一步证明了分析的正确性。     

Bureaucracy Does Its Thing: US Performance and the Institutional Dimension of Strategy in Afghanistan

It is not too soon to draw cautionary lessons from the inconclusive results of US performance during more than 11 years of Operation ‘Enduring Freedom’ in Afghanistan. As in Vietnam, fundamental difficulties persist in adapting enduring institutions to the requirements of strategy. At the heart of the matter is tension between the assumptions that underlie counterinsurgency as practiced in Afghanistan and organization of the US Armed Forces, State Department, and Agency for International Development. Knowledge of basic principles and necessary changes is available to answer the question, could the US have done better?     

Global counterinsurgency and US army expansion: the case for recruiting foreign troops

Given the nature of global counterinsurgency operations, the demands of military expansion, and the need for cultural, linguistic, and regional expertise, the United States Army should evaluate the establishment of US-led foreign troop units for its evolving force structure. This article proposes the creation of an American foreign legion based upon the recruitment of US-led, ethnically homogeneous tribal force units to meet the grist mill of counterinsurgency operations. This structured approach would be more beneficial than the current reliance on a de facto American Foreign Legion, represented by private military contractors (PMCs), many of them comprised of foreigners. These PMCs carry a number of oversight, accountability, and legal risks not found in a fully integrated, and US-officered foreign legion. The British Brigade of Gurkhas, the South-West African Police Counter-Insurgency Unit (Koevoet), and the Kit Carson Scouts serve as relevant historical examples where foreign troops were used to supplement national manpower resources.     

Counterinsurgency force ratio: strategic utility or nominal necessity

As a consequence of intervention in Iraq and Afghanistan, force ratio for counterinsurgency (COIN) has come under increased scrutiny. Reduced to its essence, the issue is simply, ‘How many troops does it take to get the job done?’ This answer has been sought by the US military, academia, and think tanks. There have been numerous responses, culminating in several ‘plug-and-play’ equations for minimum force ratios in COIN operations. Due to the impossibility of determining precisely how many insurgent forces there are, it has become common to base force ratios on the population of the country. In the realm of policy, the question above is posed as, ‘How many of our troops does it take to get the job done?’     

基于插件技术的人工免疫智能空间优化平台研究

采用人工智能方法求解空间优化问题已成为当前地理学研究领域的热点之一。研究目的在于通过设计一个开放的、可扩展的人工免疫空间优化模型框架,开发基于插件技术的优化工具软件,丰富空间优化决策支持的方法和技术体系。研究从空间优化问题的基本特点和计算需求出发,定义了面向空间优化问题求解的克隆选择优化模型框架。在此基础上,采用"插件-宿主平台"结构设计了人工免疫智能空间优化平台的总体架构,定义免疫算子插件与空间优化问题应用插件开发机制。实验结果表明,平台的架构和功能设计充分考虑了计算平台的开放性和扩展性,通过平台标准接口的功能扩展可实现对不同类型空间优化问题的求解。空间优化问题研究者或政府决策部门无需关系人工免疫优化方法的具体内涵即可基于本平台完成其具体空间优化决策支持任务。     

自补偿液体静压精密转台轴承设计与实验

设计了一种用于精密转台的新型自补偿圆锥形液体静压轴承,并完成了轴承的制造与性能测试。采用流量平衡原理推导了轴承设计公式,得到了轴向和径向的最优刚度及其优化条件,计入制造误差对轴承承载性能进行了仿真,并测试了轴承的刚度和回转精度。结果表明:轴承刚度受到节流间隙与承载间隙的流阻比以及油腔间内流系数影响,流阻比存在最优值,而内流系数越小,对刚度越有利;计入制造误差的仿真模型能够有效预测轴承刚度范围。     

无人机集群作战概念及关键技术分析

无人机集群作战正在从概念走向雏形.文章总结了国外无人机集群作战概念的发展,分析了无人机集群作战的主要关键技术,包括大规模无人机管理与控制、多无人机自主编队飞行、集群感知与态势共享、集群突防与攻击、集群作战任务控制站等技术,并展望了未来无人机集群协同搜索、协同干扰、协同攻击、协同察/打、集群对抗等作战应用.