Regina Maris and the Command of the Sea: The Sixteenth Century Origins of Modern Maritime Strategy

The concept of the command of the sea has its roots in medieval notions of the sovereignty of coastal waters, as claimed by several monarchs and polities of Europe. In the sixteenth century, a surge of intellectual creativity, especially in Elizabethan England, fused this notion with the Thucydidean term ‘thalassocracy’ – the rule of the sea. In the light of the explorations of the oceans, this led to a new conceptualisation of naval warfare, developed in theory and then put into practice. This falsifies the mistaken but widespread assumption that there was no significant writing on naval strategy before the nineteenth century.     

金属泡沫复合材料夹芯结构的压痕响应实验

金属泡沫夹芯结构是近年来新出现的一种明显具有结构和功能一体化特点的新型轻质材料,它在临近空间飞行器、航海及汽车等领域有着广阔的应用前景。以以纤维增强复合材料面板、闭孔泡沫铝芯子为特征的复合材料夹芯结构为研究对象,对其在球形压头作用下的压痕响应、损伤模式、变形机制和失效机理进行理论分析和实验研究。研究发现,泡沫铝复合材料夹芯结构的压痕响应是夹芯结构的各个组成部分的响应、相互作用以及压头属性的综合作用结果。泡沫铝复合材料夹芯结构在球压头作用下的损伤模式为基体开裂、纤维断裂、层间分层、泡沫铝的屈服及剪切断裂五种失效模式。     

基于语义发布订阅系统的战场态势实时分发技术

随着战争形态的多样化和范围的越来越广,战场态势呈现信息量大、复杂性、无规则性、多变性。针对现有的发布/订阅系统不能支持复杂结构的态势来进行事件发布和订阅的语义匹配,提出了基于语义发布订阅系统的战场态势实时分发技术。采用本体描述战场态势的概念模型,采用RDF图表示需求方订阅条件,基于该战场态势本体设计高效的发布订阅匹配算法。实验结果表明,该技术能够支持复杂战场态势实时分发和具有较高的订阅匹配效率。     

The role of covariate balance in observational studies

Observational data are prevalent in many fields of research, and it is desirable to use this data to make causal inferences. Because this data is nonrandom, additional assumptions are needed in order to construct unbiased estimators for causal effects. The standard assumption is strong ignorability, though it is often impossible to achieve the level of covariate balance that it requires. As such, researchers often settle for lesser balance levels within their datasets. However, these balance levels are generally insufficient to guarantee an unbiased estimate of the treatment effect without further assumptions. This article presents several extensions to the strong ignorability assumption that address this issue. Under these additional assumptions, specific levels of covariate balance are both necessary and sufficient for the treatment effect estimate to be unbiased. There is a trade‐off, however: as balance decreases, stronger assumptions are required to guarantee estimator unbiasedness. These results unify parametric and nonparametric adjustment methods for causal inference and are actualized by the Balance Optimization Subset Selection framework, which identifies the best level of balance that can be achieved within a dataset. © 2017 Wiley Periodicals, Inc. Naval Research Logistics 64: 323–344, 2017     

新体制下集团军信息化建设的现状分析与对策建议

在建设世界一流军队征程中,陆军正面临着一场革故鼎新的变革。文章深入分析了集团军信息化建设中存在的官兵科技素质不高、基础设施不牢靠和指控系统不统一等问题,总结出了一是要积极参与上级信息化建设总体设计,提出操作性很强的建设具体需求;二是要依据上级的"规划图"制定好本级的"施工图",把职责范围内的各项工作落细落实;三是要扎实抓好官兵学习训练,努力提升官兵的综合科技素养等对策建议。     

军队应尽快实现“三个转变”

现代科学技术的广泛军事应用,一方面引起了作战方式方法和手段的深刻变化,另一方面则对军人素质和军事教育训练提出了新的更高要求。我们必须着眼习主席提出的"能打仗、打胜仗"强军目标,尽快实现"三个转变",即士兵要由"娇弱型"向"强悍型"转变,军官要由"管理型"向"指挥型"转变,部队要由"生活型"向"打仗型"转变。     

Original Sword Designs,Now in the Metropolitan Museum of Art,New York,Entered in Competition to Make Admiral Seymour’s City of London Sword of Honour in 1882

This paper examines two rare original Sword Designs, which have recently come to light, patterns said to be the two sides of the Sword of Honour awarded with the Freedom of the City of London to Admiral Seymour, Baron Alcester, Commander-in-Chief HM Ships and Vessels Mediterranean, for the Egyptian Campaign in 1882. The paper places the designs in their historical and iconographical context and assesses, by examining various evidence, if the patterns are, in fact, the original designs of the sword actually presented to Seymour at the Guildhall in 1883.     

储油罐区灭火确定冷却兵力部署的模拟模型

本文提出了冷却燃烧罐和邻近罐时水枪应放置的位置的一系列数学描述原则,从而建立了油罐灭火冷却力量部署的模拟模型,该模型可方便地用于计算机模拟系统。     

Rendezvous search when marks are left at the starting points

Leaving marks at the starting points in a rendezvous search problem may provide the players with important information. Many of the standard rendezvous search problems are investigated under this new framework which we call markstart rendezvous search. Somewhat surprisingly, the relative difficulties of analysing problems in the two scenarios differ from problem to problem. Symmetric rendezvous on the line seems to be more tractable in the new setting whereas asymmetric rendezvous on the line when the initial distance is chosen by means of a convex distribution appears easier to analyse in the original setting. Results are also obtained for markstart rendezvous on complete graphs and on the line when the players' initial distance is given by an unknown probability distribution. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 722–731, 2001     

防空导弹引信技术的发展

从新一代防空导弹引信发展需求出发,描述了国外新一代防空导弹引信发展的情况,重点介绍俄罗斯新一代防空导弹包括S-300V,S-300PMU,“道尔”,“通古斯卡”等导弹引信的主要性能,提出了防空引信、引战配合及仿真技术的发展方向和重点研究项目.