Evolutionary determinants of war

This paper considers evolutionarily stable decisions about whether to initiate violent conflict rather than accepting a peaceful sharing outcome. Focusing on small sets of players such as countries in a geographically confined area, we use the concept of evolutionary stability in finite populations. We find that players’ evolutionarily stable preferences widen the range of peaceful resource allocations that are rejected in favor of violent conflict, compared to the Nash equilibrium outcomes. Relative advantages in fighting strength are reflected in the equilibrium set of peaceful resource allocations.     

机械抖动偏频激光陀螺静态测角方法

阐述采用机械抖动偏频激光陀螺进行静态角度测量的原理,分析测角随机误差与激光陀螺角随机游走系数、测量时间的关系,通过转台分度误差实验验证了测角随机误差公式。采用排列互比法对测角系统误差和转台分度误差进行分离。实验与理论分析表明,静态测角方法具有良好的环境适应性和稳定性,测角随机误差优于0.26″,系统误差优于1″。最后分析了进一步减小测角随机误差和系统误差的措施。     

应用镁金属化学还原法制备多孔Si/Si-O-C负极材料机理研究

以二乙烯基苯和聚硅氧烷为原料经先驱体转化法制备Si-O-C材料,利用镁金属在惰性气氛保护下高温还原制备多孔的Si/Si-O-C负极材料。利用X射线衍射、能谱分析、元素分析和场发射扫描电镜分析多孔Si/Si-O-C负极材料的组成、结构、形貌,从而研究利用镁金属化学还原法制备多孔Si/Si-O-C负极材料的机理。结果表明,镁金属在还原过程中生成MgO和Mg_2SiO_4等产物,经HCl洗涤后可形成多孔的Si/Si-O-C负极材料。Si/Si-O-C材料中的单质硅分布于多孔的Si-O-C相中,一定程度上可缓解Si在循环过程中产生的体积效应。利用镁金属还原Si-O-C材料制备多孔Si/Si-O-C材料是一种可行的制备方法。     

吸气式远程超声速防空导弹一体化外形设计的几个重大技术问题

根据国外吸气式超声速战术导弹一体化外形设计取得的最新进展 ,着重分析了这类导弹外形设计的特点和技术关键 ,提出了吸气式远程超声速防空导弹一体化外形设计中应解决好的几个重大技术问题 ,以期引起各方对吸气式防空导弹总体设计中有关问题的关注和讨论 ,共同寻找解决这些技术问题的有效途径     

连续变结构系统单步法数字仿真的步长计算

在研究固定结构的连续变结构控制系统单步法数字仿真问题基础上,提出保证准滑模运动精度的仿真步长选择思想和计算方法,并给出仿真实例.研究表明,文中的方法是正确可行的.     

电发火系统感应电流测试方法研究

对电发火系统在电磁环境下的感应电流测量采用一种新型的白光干涉型光纤测温仪。通过测量电发火系统中电火工品桥丝在电磁环境下温度的变化,利用桥丝温度和感应电流的关系,测量出桥丝上的感应电流,进而对弹箭系统进行电磁环境效应评估。     

基于BP神经网络的柴油机调速特性和外特性统一建模

对比分析了柴油机调速系统常用的两种建模方法的优缺点,采用BP神经网络方法建立了柴油机调速特性和外特性统一模型,并给出了仿真结果。     

纳米氧化钒薄膜的制备

以钒醇盐为原料,采用溶胶—凝胶法制备了具有纳米结构的氧化钒薄膜,对影响氧化钒溶胶稳定性的因素进行了系统研究,并初步探讨了焙烧工艺条件对氧化钒薄膜价态的影响。     

超连续谱激光光源研究进展

高非线性光纤制造技术的成熟和光纤激光器性能的提升,极大地促进了超连续谱光源的快速发展,以光纤为非线性介质的超连续谱的产生成为当前研究热点。从可见光、近红外和中红外3个不同波段,综述了超连续谱产生的技术方案与最新进展。当前,可见光和近红外波段的超连续谱光源输出功率已经突破百瓦量级,并出现了多芯光子晶体光纤、光纤放大器和随机光纤激光器产生超连续谱等众多新方案;以氟化物光纤和亚碲酸盐光纤为非线性介质的中红外超连续谱,输出功率也突破了十瓦量级;在光谱拓展方面,以硫系光纤为非线性介质的超连续谱,输出光谱已扩展到12μm以上。     

Clustered coverage orienteering problem of unmanned surface vehicles for water sampling

This study investigates a clustered coverage orienteering problem (CCOP), which is a generalization of the classical orienteering problem. The problem is widely motivated by the emerging unmanned techniques (eg, unmanned surface vehicles and drones) applied to environmental monitoring. Specifically, the unmanned surface vehicles (USVs) are used to monitor reservoir water quality by collecting samples. In the CCOP, the water sampling sites (ie, the nodes) are grouped into clusters, and a minimum number of nodes must be visited in each cluster. With each node representing a certain coverage area of the water, the objective of the CCOP is to monitor as much as possible the total coverage area in one tour of the USV, considering that overlapping areas provide no additional information. An integer programming model is first formulated through a linearization procedure that captures the overlapping feature. A two-stage exact algorithm is proposed to obtain an optimal solution to the problem. The efficiency and effectiveness of the two-stage exact algorithm are demonstrated through experiments on randomly generated instances. The algorithm can effectively solve instances with up to 60 sampling sites.