舰炮弹丸对零航路捷径超声速导弹的侵彻分析

以零航路捷径下小口径舰炮弹丸对超声速反舰导弹的侵彻毁伤效果为研究方向,仿真计算了零航路捷径下小口径舰炮弹丸与超声速反舰导弹的交汇姿态,建立了反舰导弹模型,在此基础上就不同侵彻部位及交汇角度条件下小口径舰炮弹丸对超声速反舰导弹的侵彻毁伤效果进行了有限元仿真,得出了具有统计意义的仿真结果,总结了弹丸无法毁伤导弹战斗部的几点因素。研究对有效评价小口径舰炮弹丸对超声速反舰导弹的毁伤效果以及对导弹整体的易损性分析提供了理论参考。     

环肋轴对称组合壳塑性极限分析的弹性模量调整有限元方法

基于轴对称截锥壳单元,以单元横截面峰值应力为等效应力,建立了弹性模量调整有限元方法,应用Fortran语言编制了有限元软件用于计算环肋轴对称组合壳的塑性极限载荷.该方法根据组合壳的应力分布情况调整轴对称壳单元和肋骨单元的弹性模量,并进行一系列的弹性迭代计算,计算收敛后即可以得到环肋轴对称组合壳的塑性极限载荷.通过对算例的计算证明:该方法具有良好的收敛性和较高的效率,计算结果与试验结果吻合较好.     

舰载捷联惯导动基座 F-QUEST 初始对准方法

针对目前基于惯性系的捷联惯导动基座对准方法信息利用率不高及矢量观测选取不确定性导致对准精度下降的问题,提出了一种新的舰载捷联惯导动基座滤波四元数估计（filter quaternion estimation,F-QUEST）对准方法。构建了捷联惯导动基座初始对准模型,并利用姿态矩阵链式法则将惯导初始对准转化为姿态确定问题,进而采用 F-QUEST 算法求取姿态矩阵以实现捷联惯导动基座对准。车载试验结果表明：相比传统方法,新方法具有更高的对准精度和更快的收敛速度,水平姿态角误差只需3 s 即可收敛到0．01°。     

Is the Indian Nuclear Tiger Changing Its Stripes?

Sixteen years after stepping out of the nuclear closet, India's nuclear posture, some of its operational practices, and hardware developments are beginning to mimic those of the original five nuclear weapon states. Several proliferation scholars in the United States contend that India's national security managers are poised to repeat the worst mistakes of the superpowers’ Cold War nuclear competition, with negative consequences for deterrence, crisis, and stability in South Asia and the Asia-Pacific region. This article takes a contrarian view. It dissects the best available data to show why the alarmist view is overstated. It argues that not only are the alarmists’ claims unsupported by evidence, their interpretation of the skeletal and often contradictory data threatens to construct the very threat they prophesize.     

Combating Islamist radicalisation in South Africa

Is radical Islamism spreading in South Africa? The answer has to be an emphatic ‘yes’. When discussing issues of radicalisation in Africa, commentators often examine the case of Somalia's al-Shabaab or al-Qaeda's North African franchise, al-Qaeda in the Islamic Maghreb (AQIM). Very little attention is paid to radicalisation amongst South Africa's Muslim population. Yet, there is growing evidence that South Africa has come to play an important role in global jihadi networks, from the provision of safehouses and identity documents to the movement of funds and the existence of paramilitary camps for local and foreign jihadis. This paper aims to briefly examine radicalisation and its attendant sources in the country, as well as seeking ways to combat it utilising lessons learned from other countries. ‘Institutional socialisation’ by means of the sources of radicalisation, as well as the concept of what could be termed ‘the democratisation of jihad’ are discussed. The author also proposes ways to combat radicalisation in South Africa utilising lessons learned from other countries, concluding that issues of radicalisation and deradicalisation have to be dealt with on the part of both government and the South African Muslim community.     

装甲装备器材库存超(欠)储状态分析与程度评价

定义了装甲装备器材库存超(欠)储的概念,提出了维修保障资源点器材储存状态的定性判别和量化方法;考虑数量、时间、空间等影响因素,提出了资源点维修器材超(欠)储程度的评价指标和评价方法,并结合某军区实际数据进行了验证。结果表明:资源点的平均超(欠)储程度反映了保障体系内所有资源点库存偏离正常水平的平均程度,可为确定调剂资源点的优先次序和供应数量提供依据。     

隔离型DC/DC变换器的嵌入式滤波设计

传统的隔离型DC/DC变换器输入端电流断续,会对电源或负载产生严重的电磁干扰,利用嵌入式滤波(Built-in Input Filter,BIF)的方法可以实现输入电流的连续。以嵌入式滤波全桥为例对嵌入式滤波的原理进行了分析,提出了隔离型DC/DC变换器嵌入式滤波拓扑、变压器以及交叉耦合电容参数的设计方法,并用该方法推导和设计了带有嵌入式滤波功能的半桥拓扑,利用PSIM软件进行了仿真分析。搭建了新型半桥拓扑的试验样机,验证了设计方法的有效性。     

The German wars of liberation 1807–1815: The restrained insurgency

In the Age of Napoleon, ‘small wars’ and ‘revolutionary war’ were closely connected. There were, however, different strands of this phenomenon: speaking professionally, conservative officers condemned small wars as an irregular regression to previous less disciplined forms of warfare. The Prussian state continually tried to discipline and regulate spontaneous risings. Yet the irregular character of small wars offered the opportunities for a less complex way of fighting, thus enabling the arming of the ‘people’ to fight. Individual undertakings, such as Ferdinand von Schill's doomed campaign in 1809, were designed to spark off a general popular uprising. But they were cheered by many and supported by few. Meanwhile, Neidhardt von Gneisenau conceived guerrilla-style Landsturm home-defence forces, which were designed for an irregular people's war. These concepts were put into practice in the ‘war of freedom’ – or ‘war of liberation’ – in 1813. Eventually both the mobilisation and the tactics remained regular, however, despite the emphatic appeal to a national ‘people's war’.     

雷达天线扫描方式的自动识别方法

为了对雷达天线扫描方式进行自动识别,改进开发了天线扫描方式模拟器,并分别研究了电子扫描和机械扫描的特征提取和识别方法。基于最大主瓣脉冲序列的特征参数实现电子扫描和机械扫描的区分,然后基于单个天线扫描周期脉冲序列的特征参数实现8种机械扫描方式的自动识别。仿真结果表明,本文方法能够区分一维电扫、二维电扫和机械扫描,并且采用支持向量机决策树对机械扫描方式的识别正确率高于决策树方法。     

MEMS磁力线聚集和垂动调制磁场传感器

针对巨磁阻和磁隧道结等磁阻元件的1/f噪声,提出一种采用微机电系统的磁力线聚集和垂动调制磁场传感器。通过将被测磁场从低频转移到几kHz,实现对磁场的DC/AC转化,从而减小了磁阻元件的1/f噪声。基于该方案采用多层膜巨磁阻元件AA002制作了磁场传感器样品,并进行了实验测试,结果表明:磁传感器样品的调制效率达到了19.3%,超过了已有的其他各种调制方案,同时低频磁场的探测能力达到槡120pT/Hz,相比巨磁阻元件AA002提高了40多倍。