基于群体协同的驱护编队中近程防空的系统效能

针对中近程反导的具体要求,分析了典型的驱护编队反导模式下编群队形特点,研究了指挥舰与护卫舰的队形关联性,探讨了基于信息化作战模式的抗饱和攻击能力,建立了基于多目标优化的最保守与最乐观情况下的抗饱和攻击模型,得到舰艇编队协同防空的系统效能,对驱护编队防空反导指挥决策具有很强的参考价值。     

Resistance through Islamic clerics against Boko Haram in northern Nigeria

Islamic clerics and scholars constitute one of the community actors affected by the Boko Haram crisis in northern Nigeria. This group is also one that is most familiar with the essential doctrinal elements required to deconstruct the narrative pushed by Boko Haram in a crisis where ideology represents a vital aspect. While not undermining the bearing which socio-economic and political issues have on the crisis, this paper frames the focus to emphasise the long-term battle where Islamic clerics are involved in winning hearts and minds. Drawing upon fieldwork conducted in Sokoto State and Borno State, this paper highlights the influential role of clerics in communal mobilisation and resistance against Boko Haram. It is suggested that a deeper integration of this community actor into the broader counter-insurgency struggle in northern Nigeria would be beneficial.     

“经济自由”与“自由经济”辨析——理想与政策

自由主义的实践历史 ,是从争取宗教自由开始 ,继而争取政治自由 ,直到近代和现代 ,却转移集中争取经济自由。“经济自由”虽然是个极重要的课题 ,但是一般论著却把目标 (理想 )性的经济自由混淆作手段 (方法 )性的自由经济 (制度 )。相应地 ,一般论者也把“经济自由主义”错误地狭限于“放任 (自由 )经济制度”以满足一小撮人的经济自由。再者 ,本文认为高寿昌先生早在 6 0年代在外地发表的《经济的自由主义》一文很具卓见和勇气 ,现在试图运用 (广义 )逻辑学把它精确化 ,特别是严格区分“经济自由”与“自由经济(制度 )” ,以显示逻辑分析的重大实用价值     

雷达诱饵对空空导弹对抗干扰效果分析

在复杂电子对抗条件下,采用伴飞诱饵对雷达制导空空导弹进行干扰可以有效地提高载机的突防和生存概率。为一次得到在干扰下空空导弹脱靶量与时间的关系,分析诱饵对空空导弹干扰的对抗过程,创新性的采用伴随方法建立了诱饵作用下空空导弹末制导伴随模型,并通过放真程序进行仿真得到对抗过程中各种条件下的空空导弹末制导脱靶量,结果表明,载机在合适的时间投放诱饵并机动能够引起较大脱靶量并降低空空导弹对载机的威胁程度,证明了伴随方法的有效性并为伴飞诱饵的应用提供理论依据。     

近地卫星Ka频段数传链路抗雨衰ACM模式设计

针对近地卫星数传时的信道时变性和严重的Ka频段雨衰现象,采用自适应编码调制（ACM）技术能够充分利用链路资源,相对于传统的固定编码调制方式,进一步提高了链路的数据吞吐量。提出了近地卫星Ka频段数传链路ACM模式设计方法,在降雨环境下建立Ka频段数传链路模型,根据信道状况确定ACM选用模式;采用基于导频符号的最大似然信噪比估计算法结合移动平均的平滑方法实现信道估计,有效地减小了估计值的波动。仿真结果表明,无论晴天还是雨天,采用提出的卫星数传链路ACM模式设计方法,能够在保证系统可靠性的同时获取较高的数据吞吐量。     

Effects of material of metallic frame on the penetration resistances of ceramic-metal hybrid structures

The effects of metallic material on the penetration resistances of ceramic-metal hybrid structures against vertical long-rod tungsten projectiles were studied by artillery-launched experiments and numerical simulation. Hybrid structures with rectangular cores in transverse orthogonal arrangement and slide-fitting ceramic inserts of zirconia toughened alumina prisms were fabricated with titanium alloy TC4 (Ti6Al4V), AISI 4340 steel and 7075 aluminum alloy panels, respectively. The results showed that the hybrid structure of Ti6Al4V exhibited the highest penetration resistance, followed by that of 7075 aluminum alloy with the same area density. The penetration resistance of the hybrid structure of AISI 4340 steel was the lowest. The underlying mechanisms showed that the metallic material of a ceramic-metal hybrid structure can directly affect its energy absorption from the impact projectile, which further affects its penetration resistance. Different metallic frames exhibited different failure characteristics, resulting in different constraint conditions or support conditions for ceramic prisms. The high penetration resistance of the Ti6Al4V hybrid structure was due to its stronger back support to ceramic prisms as compared with that of AISI 4340 steel hybrid structure, and better constraint condition for ceramic prisms by metallic webs as compared with that of 7075 aluminum alloy hybrid structure. The results of mass efficiency and thickness efficiency showed that the Ti6Al4V hybrid structure has advantages in reducing both the thickness and the mass of protective structure. In addition, because the ceramic-metal hybrid structures in the present work were heterogeneous, impact position has slight influence on their penetration resistances.     

地空导弹弹道仿真模型

地空导弹弹道仿真是地空导弹火力单元作战过程仿真的一个重要环节,仿真模型的合理性、算法的可行性、过程描述的正确性,直接影响防空作战仿真结果.从仿真的实际需要出发,给出不同引导方法下的弹道仿真模型、算法、过程描述及关键问题的解决方法,并通过实际应用验证了模型、算法的合理性、可行性和实用性.     

无人战斗机航路规划圆切线算法

通过对无人战斗机低空进入敌防区面临的各种威胁进行分析,建立了适用于圆切线算法的威胁场模型;由于可行方向法对威胁圆叠加时规划出的航路效果不理想,提出了圆的切线算法理论作为此航路规划方法的改进,采用随机产生威胁场的方法来模拟多变的战场环境,并且进行了理论分析,最后得出仿真结果.仿真证明,将两种方法结合规划出的飞行航线在航程上是比较理想的,而且路径规则的效果也得到了很大的提高.     

高超声速飞行器前体外形设计与气动特性分析

利用数值计算开展了高超声速飞行器前体气动特性的考察,重点研究了三维效应对于前体流场及预压缩性能的影响,提出了抑制三维侧缘溢流影响、改善三维前体气动性能的前体侧缘设计思想,考察了侧缘外形的容积效率,提出了有效容积效率的概念和评估方法,对于不同侧缘形式的前体构型进行了气动特性的考察,给出了不同前体构型气动特征的变化规律。     

舰空导弹武器系统在干扰条件下的使用研究

在未来海战中 ,为确保舰空导弹在干扰条件下有效地拦截反舰导弹 ,分析了舰空导弹武器系统可能遇到的干扰 ,并对其战斗使用进行了研究。