The ‘first’ surge: the repulse of the Easter Invasion in South Vietnam, 1972 – implications for Iraq and Afghanistan

In a military intervention, do surges work? I compare the failed ‘surge’ in Vietnam, the repulse of the Easter Invasion in 1972, as a means of assessing the more ambiguous surges in Iraq and Afghanistan. I identify four features of a surge for this analysis: the military dimensions and strategy of the surging forces, the military capabilities of the host forces, the political vitality and will of the host country, and the political commitment in the domestic politics of the intervener. I find that the last feature is the most critical; and, in all three surges, the American political commitment was lacking.     

转管炮降低机心组导轨摩擦力研究

为了使转管炮机心组消耗的驱动功率最小,对机心组速度、主滚轮相对机体位置、机心体左右导轨及倾角关系等对驱动功率的影响进行研究。表明最好选用机心组凸轮加速度最小,主滚轮相对机体质心位置等于零,最好用无横向位移以及有夹角的关系最好。优化结果表明:9 000 rpm的射速,驱动功率由机心组加速度变化引起140kw下降到31 kw,降到不足于原设计曲线的22%;射速为3 300 rpm的主滚轮压力峰值参数化峰值1 086.5 N,升高到10 000 rpm的峰值9 779.3 N。无横向以及有夹角降低压力有横向以及无夹角90.9%。     

探索新疆少数民族优秀传统文化融入南疆高校“微德育”的途径

在少数民族地区有效开展德育工作,既要弘扬社会主义主旋律,又要照顾到少数民族大学生的特殊民族文化背景。新疆少数民族优秀传统文化是中华民族的共有精神财富,蕴含广博的德育资源。“微德育”是“微时代”背景下高校进行德育工作的创新手段,将新疆少数民族优秀传统文化融入南疆高校“微德育”,对于推进新疆少数民族优秀传统文化现代化、强化德育的实效性和促进民族团结、维护祖国统一有着重要的实践意义。     

Reclaiming the Party’s Control of the Gun: Bringing Civilian Authority Back in China’s Civil-Military Relations

ABSTRACT

Since emerging as China’s top leader following the 18th Party Congress, Xi Jinping has moved swiftly to consolidate his formal authority as Central Military Commission chairman over the Chinese People’s Liberation Army. In redressing the civil-military imbalance wrought by Dengist economic reforms, the commander-in-chief has combined institutional mechanisms with the use of fear to impose authoritative civilian control over the military. This paper proposes that a combination of changes to the Chinese strategic environment has contributed to Xi’s utility of the anti-corruption campaign to purge the regime’s coercive forces of its previous underpinnings, and advances that the war on military malfeasance has given rise to a new set of dynamics in civil-military relations in post-Reform China.     

Northern Ireland and minimum force: the refutation of a concept?

The debate over whether there exists a British counter-insurgency tradition of minimum force is one that has been thoroughly discussed. Is there anything left to say? This study suggests there is further insight to be attained if one explicitly evaluates the concept of minimum force in relation to the conduct of the security forces in the years of the Northern Ireland conflict. Through an examination of three key periods in the conflict, it will be shown that while there was invariably an awareness of the need to act with restraint among senior officers at the strategic level, this was often difficult to apply at the tactical level in the heat of confrontation. The argument demonstrates that the British Army, and other instruments of the state, rarely acted in a manner that could be described as ‘minimal’. Instead, it was the broader liberal values of the British state that explains largely the degrees of restraint exhibited by the government and security forces.     

尾空泡对水下航行体流体阻尼力影响数值计算分析

针对航行体尾空泡对流体阻尼力影响的问题,结合动坐标系技术和空泡多相流数值模拟方法,通过求解雷诺平均的纳维-斯托克斯方程组,进行阻尼力计算研究。试验数据对比结果表明,该方法具有较好的精度。数值计算研究表明,尾空泡会削弱航行体尾部压力的不对称性,使航行体尾部流体阻尼力减小。当尾空泡增加到一定尺寸时,流体阻尼力减小的幅度逐渐趋缓,同时尾空泡也改变了流体阻尼力随攻角的变化趋势。研究充分表明了航行体流体力设计中考虑尾空泡影响的必要性。     

阵列雷达波束内双目标的极大似然角度估计方法

单波束内目标往往相距较近,采用传统角度分辨技术难以将其分辨,从而给目标跟踪和识别带来较大困难。于是提出基于LM算法的极大似然角度估计方法,实现波束内双目标的分辨。该方法在阵列雷达的基础上建立双目标回波模型,推导极大似然角度估计算法。考虑到求解算法直接影响极大似然角度估计的收敛速度和估计精度,利用LM算法实现了极大似然估计的求解,从而得到目标角度的精确估计。该方法避免了多次脉冲相干积累,具有计算量小的特点。仿真结果验证了方法的有效性。     

尾空泡对水下航行体流体阻尼力影响数值研究

针对航行体尾空泡对流体阻尼力影响问题,结合动坐标系技术和空泡多相流数值模拟方法,通过求解雷诺平均的NS方程组,进行了阻尼力计算研究。通过与试验数据对比,表明该方法具有较好的精度。数值计算研究表明,尾空泡会削弱航行体尾部压力的不对称性,使航行体尾部流体阻尼力减小。当尾空泡增加到一定尺寸时,流体阻尼力减小幅度逐渐趋缓,同时尾空泡也改变了流体阻尼力随攻角的变化趋势。研究充分表明了航行体流体力设计中考虑尾空泡影响的必要性。     

有限质量降落伞充气动力学数值模拟

为研究空投任务中降落伞有限质量充气过程的动力学行为,基于罚函数耦合方法和网格自适应技术分析了降落伞柔性结构与周围不可压缩流场的流固耦合特性。数值模拟开伞过程伞衣三维外形变化,获得降落伞系统下落速度、阻力面积等参数;对比分析初始投放速度对降落伞开伞时间、伞衣阻力面积的影响;通过试验数据对比分析开伞力变化。计算结果表明,该方法可以有效模拟降落伞系统有限质量充气过程的动力学特性,仿真结果与试验结果相符。     

飞机武器系统作战效能分析研究的进展

阐述了飞机武器系统的组成、作战任务、作战效能分析等发展概况。在此基础上就飞机武器系统作战效能分析研究进行了综述 ,并指出了飞机武器系统作战效能分析的发展趋势