基于功率控制的水下声学传感器网络部署

目前对在传感器网络部署优化的研究中,主要集中在二维传感器部署优化的研究上,对水下三维传感器网络的部署研究特别是以优化网络资源、延长网络寿命为目的水下传感器网络非均匀部署的研究较少。改进了现有传感器探测模型,建立探测功率与传感半径的关系,结合体心立方格覆盖方案,建立了水下传感器网络非均匀部署模型,仿真实验表明,非均匀部署模型有效地控制了节点部署密度,平衡了网络能量,相对于均匀部署模型显著提高了网络寿命。     

濒海战斗舰——美国海军新型装备

美国海军称濒海战斗舰（LCS）是一种适于近海复杂水情的快速、高度机动的水面作战平台。海湾战争之后,美军为了加强水面舰艇对地攻击、加强机动性和适应削减军费的形势,濒海战舰应运而生一跃成为当今世界武器的新宠。LCS具有单体和三体两种船体,根据三种作战任务实现模块化重构。尽管发展十多年来LCS在功能设计和火力配置上远远未达到军方的要求,被人指责为＂中看不中用＂,尽管LCS的费效比一直为美国国会所诟病,然而,LCS的建造代表着美国海军作战理念的战略转型。美海军在LCS的快速灵活、续航能力、武器装备方面不断寻求最优组合,以达到其控制亚太和世界海洋权的目的。文章较为系统地介绍美国LCS崛起的原因、发展历史、战术技术性能及近期发展动态。     

线性赋范空间中一类非线性方程的迭代解

在一般的线性赋范空间中研究一类算子方程的解的迭代逼近问题,获得了一系列结果。     

The Peninsular War guerrilla and its antecedents: humiliation forgotten,disaster prefigured: the guerra fantástica of 1762

ABSTRACT

The brief war that took place between Spain and Portugal in 1762 is one of the least known episodes in the latter’s military history, whereas, thanks to Wellington’s construction of the Lines of Torres Vedras, the French invasion of 1810–11 is right at the other end of the spectrum. Yet the two episodes are closely linked to one another. At the very least, they are uncannily reminiscent in terms of their details – in both cases substantial foreign armies were vanquished through a combination of irregular resistance, scorched-earth tactics and the clever use of field fortifications – and the article therefore argues that Wellington based the plan that defeated the forces of Marshal Massena on the strategy used by the Portuguese half a century earlier.