柱体大攻角入水弹道建模与仿真

基于CFD计算获得了柱体大攻角入水过程流体动力特性,进而建立了大攻角入水弹道模型,使用流场-弹道耦合计算结果验证了模型的适用性和精度,然后仿真分析了入水攻角和速度对入水弹道的影响规律。该模型能较准确地预测柱体大攻角入水弹道,对研究发射平台安全性问题和空投鱼雷等入水攻击性武器的入水弹道预测问题等有较强的指导意义。     

一种基于压缩Fisher向量的目标检索方法

当前,视觉词典法(Bo VW,Bag of Visual Words)是解决目标检索问题的主要方法,但传统的Bo VW方法具有词典生成时间效率低、检索内存消耗大等问题。针对这些问题,提出了基于压缩Fisher向量的目标检索方法,该方法首先将Fisher核机制用于目标检索,它能自动降低目标图像背景带来的不利影响,然后,采用位置敏感哈希(LSH,Locality Sensitive Hashing)对Fisher向量进行压缩编码以降低计算复杂度和内存开销,使之适用于大规模数据库。实验结果表明,新方法只用几百比特就能表征一幅图像内容,对大规模目标检索有很好的适用性,且较之当前主流的压缩视觉词典法具有更高的准确率。     

一种强干扰环境下的相干弱目标DOA估计算法

提出了一种强干扰环境下相干弱信号的DOA估计算法。该算法通过修正的Toeplitz矩阵实现了对相干弱信号的解相干,然后将强干扰信号对应的特征矢量从信号子空间中剔除,最后利用MUSIC算法对弱信号进行DOA估计。所提算法不需要预知强干扰信号方位信息,对非平稳噪声有较好的抑制性能。此外,相对JJM算法,该算法具有更高的估计精度和正确概率,对强干扰信源具有更好的抑制性能。     

多波束相控阵天线角跟踪性能及测试方法

针对目前对多波束相控阵天线角跟踪性能测试研究较少的问题,首先分析了多波束相控阵天线的单脉冲和差测角方法,并对波束滑动、波束穿越及信号频率变化对角跟踪性能的影响进行了仿真分析。类比传统的雷达精度校飞试验,提出了基于飞艇的角跟踪性能测试方法,对角跟踪精度及误差范围进行测试,并利用STK软件实现了可视化。仿真分析表明,该方法可以实现对多波束相控阵天线角跟踪性能的评定并具有较高的工程应用价值。     

White hull or white elephant? Soft power and the Chinese hospital ship,the Peace Ark

Although soft power is now seen as an indispensable foreign policy tool, its efficacy has rarely been put to a rigorous empirical test. Using data from HARMONIOUS MISSIONs 2010, 2011 and 2013, this article seeks to examine the degree to which the soft power engagement missions of the Chinese hospital ship, the Peace Ark, has advanced Chinese interests. Although any conclusions drawn must be considered preliminary, as so little time has passed between the ship's visits and the current analysis, this research indicates that these missions’ impact on advancing Chinese interests was at best limited. Although observations from a single set of cases are unlikely to settle the debate between soft power advocates and detractors, it is hoped that this research will serve as a catalyst to further empirically based research on this topic.     

Sexual and gender-based violence in the Democratic Republic of Congo

Commitment by the government of the Democratic Republic of Congo to addressing sexual and gender-based violence (SGBV) in the country is reflected in a number of international commitments and national strategies. This article traces the (slow) progress in addressing some of the most important issues relating to SGBV to which the government has committed itself. It argues that unless the underlying gender norms and unequal power relations that form the basis of gender violence, discrimination and inequality in Congolese society are addressed, SGBV will persist.     

Military Expenditures and Natural Resources: Evidence from Rentier States in the Middle East and North Africa

It has been argued that the discovery of a new natural resource greatly increases the risk of conflict. This research aims to study the effect of natural resources on military spending, using the data from rentier states in the Middle East and North Africa (MENA) countries from 1987 to 2012. In considering the ‘resource curse,’ the types of natural resources matter. Our empirical results demonstrate that the ‘resource curse’ arising from the abundance of certain natural resources, particularly oil and forest resources, leads to increases in military spending. In contrast, the rent from coal and natural gas has a negative impact on military spending, while the rent from minerals has no impact on military spending, controlling for GDP growth and per capita income.     

Musket,Rank and File for Foot Guards,Lovell’s Pattern of 1838. Ne’er a Shot Fired in Anger?

The Pattern 1838 Musket was initially designed for the rank and file of the British army, it was instead issued to the elite Foot Guards. With arguably the lowest survival rate of any 19th Century British military firearm it is one of the rarest muskets to encounter today. This is its story …     

车载火炮火力与底盘匹配性薄弱环节捕获方法

针对在车载火炮火力与底盘匹配性评估中只评估而未对薄弱环节进行捕获的现状,提出一种基于指标关联度的薄弱环节捕获方法,采用结构熵权法求得指标权重,利用模糊综合评判法对车载火炮进行定量化评估,应用指标关联度法对车载火炮的匹配薄弱环节进行捕获,最后根据薄弱环节捕获结果对车载火炮进行改进,改进后的再评估结果验证了新方法的可行性。     

反导作战多传感器任务规划技术

多传感器任务规划技术是反导作战中的重要研究内容之一,即解决如何发挥多维传感器资源的互补优势,构建"传感器-目标-任务"序列,以实现整体执行效果最优。基于JDL信息融合模型深入剖析了反导作战多传感器任务规划体系结构及其信息交互。在此基础上,结合反导作战特点,从应用和理论研究两个方面分别对多传感器任务规划技术进行了叙述。