基于参数化建模的包带式星箭连接结构优化设计

采用MSC.Patran参数化建模和遗传算法进行包带式星箭连接结构优化设计。首先给出了包带连接结构二维轴对称模型优化设计过程中涉及的V形卡块刚度等效、包带预紧力模拟和载荷施加方法,以及强度和刚度约束条件、优化目标等内容;然后以某直径为3m的包带连接结构为例进行了优化设计,并分析了对接框内延伸段长度和端头高度对应力及变形的影响;最后建立三维有限元模型进行静力分析。结果表明（1）该方法适用于包带连接结构的优化设计;（2）增加对接框内延伸段长度和端头高度能够提高整体连接刚度;（3）三维有限元模型与轴对称模型计算结果一致,验证了轴对称模型分析方法的正确性,以及V形卡块等效和预紧力模拟方法的有效性。     

Military Spending and Economic Growth in the Middle East Countries: Bootstrap Panel Causality Test

This study revisits the causal relationship between military spending and economic growth in 10 Middle East countries via a panel causality analysis that accounts for cross-sectional dependence and heterogeneity across countries. Our results indicate unidirectional causality from military spending to growth for Turkey; one-way causality from economic growth to military spending for Egypt, Kuwait, Lebanon, and Syria; bidirectional causality for Israel; and no causality in either direction for Jordan, Oman, and Saudi Arabia. The empirical evidence does not provide consistent results regarding the causal relationship between defense expenditure and economic growth in these countries.     

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.     

Transnational terrorism as a spillover of domestic disputes in other countries

This paper models transnational terrorism as a three‐way strategic interaction involving a government that faces armed opposition at home, which may spill over in the form of acts of terrorism by the state's opponents against the government's external sponsor. The external sponsor also utilises deterrence against potential terrorists, which only lowers terrorism if terrorists are not intrinsically motivated by a deep‐seated sense of humiliation. The model highlights the importance of intrinsic motivation. A rise in the external power's preference for deterrence against terrorism may backfire in these circumstances. Increases in the government's military efficiency against the rebels, who are also terrorists against the government's sponsor, raises overall levels of violence.     

MODELLING THE RELATIONSHIP BETWEEN DEFENSE SPENDING AND ECONOMIC GROWTH FOR THE FIJI ISLANDS

The goal of this paper is to examine the nexus between GDP and military expenditure. We model this relationship within a multivariate framework by including exports in the model. We use the recently developed bounds testing approach to cointegration and find that there is a long run relationship among the variables when GDP is the endogenous variable. Normalizing on GDP and using four different estimators, we find that in the long run both military expenditure and exports have a positive impact on GDP. Finally, using the Granger causality test, we find that there is evidence for military expenditure Granger causing exports and exports Granger causing GDP, implying that military expenditure indirectly Granger causes GDP in the short run. In the long run, we find that both military expenditure and exports Granger cause GDP for Fiji. Our findings are consistent with the Keynesian school of thought, leading us to derive some policy implications.     

The Long-run Causal Relationship Between Military Expenditure and Economic Growth in China: Revisited

This paper re-examines the long-run causal relationship between military expenditure and economic growth in China over the period 1952–2010. An empirical econometric analysis based on a Barro-style growth model is conducted. By employing the Bartlett corrected trace test, which provides better approximations of the finite sample distribution to determine the rank of cointegration, the results support the existence of a single long-run equilibrium relationship between the variables. Furthermore, it is confirmed that the cumulated shocks of military expenditure primarily originate from different components of shocks that relate to economic development rather than the other way round.     

BUTTER,GUNS AND ICE‐CREAM THEORY AND EVIDENCE FROM SUB‐SAHARAN AFRICA

This paper is intended to complement the existing literature on civil wars. First, it presents a simple theoretical model of conflict that defines a two‐sector economy. In a contested sector, two agents struggle to appropriate the maximum possible fraction of a contestable output. In an uncontested sector, they hold secure property rights over the production of some goods. Agents split their resource endowment between ‘butter’, ‘guns’ and ‘ice‐cream’. Following the theoretical insights the empirical analysis focuses on the relationship between civil wars and different sectors of the economy. In particular, a panel probit specification shows that the incidence of a civil war decreases in the size of manufacturing sector.     

The causal nexus between military spending and unemployment in the G7: a bootstrap panel causality test

We revisit the causal relationship between military spending and unemployment in the G7 countries applying a bootstrap panel causality analysis that accounts for both cross-sectional dependence and for heterogeneity across countries. Using per capita real GDP as a controlled variable, we found a unidirectional causality running from military spending to unemployment for Canada, Japan, and the US, one-way causality running from unemployment to military spending for France and Germany, and bidirectional causality for Italy and the UK. The empirical evidence does not seem to provide consistent results regarding the causal relationship between military spending and unemployment in G7 countries.     

舰载火箭炮子母弹射击火力分配模型

摘 要：由于舰载火箭弹的弹道特性与普通身管炮弹有着明显的差异,传统的舰炮射击效力计算及火力分配方法不适用于舰载火箭炮。结合舰载火箭弹弹道特点,分析了其射击误差,探讨了集群目标的简化处理方法,提出了一种基于蒙特卡洛法的舰载火箭炮对岸射击最优效力射火力分配计算模型。通过举例分析表明,该方法切实可行,利用该模型可以提高射击指挥员指挥决策的科学性。     

某型炮射导弹工况射击时目标丢失现象分析

某型炮射导弹在定型试验期间出现瞄准线跳动、工作指示灯反复熄灭、目标丢失的现象,致使炮射导弹无法正常工作.造成制导火控系统工况转换的原因较多,为了快速查明该故障原因,利用模糊综合评判方法,较为准确地实现故障定位,通过后续试验数据结果证明,该方法有效可靠,对炮射导弹定型试验期间故障诊断具有积极的参考价值.