多比特信息分布式检测优化研究

本文拓展了通常意义下多传感器组网分布式检测模型,允许各传感器向融合中心传输多比特信息。给出了Ｋｕｌｌｂａｃｋ分辨率意义下,确定最优多比特信息的方法,以利于改善系统检测性能。数值结果表明,多比特信息分布式检测方案是可行的。     

涵道螺旋桨气动特性数值模拟

以某涵道螺旋桨为研究对象,利用动量理论分析了孤立螺旋桨和涵道螺旋桨产生不同拉力的原因;同时利用SST k-ω湍流模型,采用三维Navier-Stokes方程,利用滑移网格模型,通过数值模拟分别计算了孤立螺旋桨与涵道螺旋桨的复杂流动,分析它们在不同转速下,拉力系数、功率系数和效率的差异。分析表明,加上涵道以后,有效抑制了螺旋桨桨尖涡,减少了能量损失。在相同转速下,总拉力系数增加23%,涵道螺旋桨的拉力系数与功率系数的比值比孤立螺旋桨的高出40%,效率显著提高,同时需用功率系数也略有增加,约0.05,结果与理论分析相吻合。     

量子环流理论研究富勒烯分子的磁学性质

在原子轨道线性组合方法中引进规范变换,推导出在外加恒定磁场下分子中的电子环流表达式,应用该理论导出了分子磁化率的一般公式,并对Ｃ６０和Ｃ７０分子中π电子的磁化率进行了计算。     

An alliance between Cyprus and Greece: assessing its partners’ relative security contribution

The issue that this paper tackles is the assessment of the relative security benefits that Cyprus and Greece derive in the context of their cooperation on defence matters. This form of cooperation, known as the ‘Integrated Defence Space Doctrine’, aims at defending their interests in the Aegean Sea and the broader East Mediterranean theatre. The paper relies heavily on earlier research on this topic, which deals with the Greek–Cypriot alliance facing an arms race against Turkey, and uses a coefficient especially designed to assess the optimal levels of security and the associated defence expenditure of the two allies. A comparison of the relative security coefficient values for the two allies suggests that the security benefit that Greece derives thanks to its alliance with Cyprus exceeds the corresponding Cypriot benefit by far. Given the importance assigned to human resources by this index, in conjunction with the demographic problems of Greece, this conclusion justifies the recent Greek defence policy revision, emphasizing quality, capital equipment and flexibility of forces. This revision aims at satisfying the security requirements of the alliance and the increasing demands of an arms race against Turkey.     

Evasion costs and the theory Of conscription

This paper examines the trade and military relationship between two countries which have a common military enemy. The paper explains how the former two countries, which are military allies and trading partners, share the burden of defence against the third country. It demonstrates how the defence production of a country may hurt its ally because the latter country's terms of trade can be deteriorated. Whether or not a smaller ally spends less on defence is analyzed. Also analyzed is the effects of the reactions of the enemy country on the trade between the two allies and their welfare.     

Determinants of military expenditure and the role of globalisation in a cross-country analysis

Abstract

Anecdotal evidence offers conflicting views on the impact of globalisation on military expenditure. We contribute to the existing literature by investigating the effect of globalisation on military expenditure in 82 countries for the period, 1989–2012. After introducing economic and strategic variables into the model, we utilise the dynamic panel generalised method of moments system to estimate the relationship in the variables. The empirical findings reveal that globalisation reduces both military burden and real military expenditure. The findings are consistent, irrespective of the globalisation indicator adopted. The policy implications of the results are explained.     

基于ANP的多目标网络目标重要度评估方法

摘　要：目标重要度分析是军事计划人员开发作战计划方案的前提和基础,是形成作战行动的基本依据。针对多目标网络中重心的抽象性及不易打击的特点,分析影响重心的关键要素及其依赖关系,提出了基于改进网络分析法的多目标网络重心模型,利用该模型分析目标相对于重心的重要度。研究了该模型涉及的两个关键技术,即改进判断矩阵以提高决策的速度和克服决策的主观性,利用协调理论确定要素之间的依赖关系。以分析某地区多目标网络的过程为例,验证了该模型的有效性和合理性。     

差压式管道内检测机器人启动过程模拟仿真

基于CFD软件Fluent提供的计算方法,利用动网格技术和UDF(用户自定义函数),对差压式管道内检测机器人启动过程进行了动态模拟.该方法克服了以往静态研究的不足,更直观地反映了不同因素影响下机器人的启动情况.仿真结果表明:管内流体速度、机器人质量、管壁摩擦力、不同流体对机器人的启动过程都有明显影响.可为下一步研究机器...     

度量空间的非标准特征(I)

本文首先引进度量空间非标准包的定义,然后将讨论非标准包的许多性质。在此基础上,用非标准方法来刻划度量空间中的各种紧性。最后应用这些结果,将证明ＡｒｚｅｌａＡｓｃｏｌｉ定理,并在较弱的条件下,得到Ｂａｎａｃｈ不动点定理。