A joint mid-course and terminal course cooperative guidance law for multi-missile salvo attack

Salvo attacking a surface target by multiple missiles is an effective tactic to enhance the lethality and penetrate the defense system. However, existing cooperative guidance laws in the mid-course or terminal course are not suitable for long- and medium-range missiles or stand-off attacking. Because the initial conditions of cooperative terminal guidance that are generally generated from the mid-course flight may not lead to a successful cooperative terminal guidance without proper mid-course flight adjustment. Meanwhile, cooperative guidance in the mid-course cannot solely guarantee the accuracy of a simultaneous arrival of multiple missiles. Therefore, a joint mid-course and terminal course cooperative guidance law is developed. By building a distinct leader-follower framework, this paper proposes an efficient coordinated Dubins path planning method to synchronize the arrival time of all engaged missiles in the mid-course flight. The planned flight can generate proper initial conditions for cooperative terminal guidance, and also benefit an earliest simultaneous arrival. In the terminal course, an existing cooperative proportional navigation guidance law guides all the engaged missiles to arrive at a target accurately and simultaneously. The integrated guidance law for an intuitive application is summarized. Simulations demonstrate that the proposed method can generate fast and accurate salvo attack.     

微流星体高速撞击航天器Whipple防护结构损伤特性研究(英文)

采用金刚石模拟高脆性、高熔点微流星体材料,对航天器典型Whipple防护结构进行高速撞击试验.试验表明,撞击产生的高温高压效应导致金刚石部分或全部转化为石墨,金刚石对防护结构的损伤主要体现在中低速阶段,当撞击速度大于4.3km/s时,对后板的灼烧损伤极为显著。     

如何讲好社会主义义利观

社会主义义利观 ,把国家和人民利益放在首位而又充分尊重公民个人合法利益 ,使义利关系真正得到了科学认识和辩证统一 ,是中国伦理史上关于义利观的第二次科学杨弃和重大发展。     

温度翘曲应力对机场刚性道面寿命的影响

分析了目前中国民航机场刚性道面的设计过程,指出在设计过程中忽视温度应力的影响不合理。参照公路水泥混凝土路面温度应力计算方法并根据Miner定律研究了温度翘曲疲劳损耗对于机场刚性道面影响规律,即温度翘曲疲劳损耗随板厚、地基反应模量的增大而增大,随着混凝土设计强度的增加而降低。然后提出采用设计寿命的影响因子nt/Nt评价温度翘曲疲劳损耗对于机场刚性道面设计寿命影响的方法并提供了相应的机场刚性道面板厚度设计流程图。最后提供了一个考虑温度翘曲应力的刚性道面设计实例,为工程应用提供参考。     

制造业IT生产力优化

分析了制造业企业在IT系统建设方面遇到的困境以及进行企业IT生产力优化的必要性,提出了企业进行IT生产力优化的基本方法体系,阐释了利用面向服务的架构(SOA)、开放组织架构框架(TOGAF)、ESB模式构建灵活稳健的企业IT架构的技术路线,并给出了针对制造业的解决方案参考模型。     

中间件技术的研究及应用

本文在分析了分布式应用系统体系结构发展变化的基础上．阐述了中间件的概念、功能和在可重用、多异构数据源应用系统的作用，对ODBC、BDE／IDAPIT、0LEDB／ADO和JDBC等分布式数据库中间件；CGI、lSAPI／NSAPI、ASP、JSP等中间件进行了分析比较，并给出了中间件技术在教务管理信息系统的应用实例。     

Weeden and Chow: Commentary from a legal perspective

The paper, ‘Space sustainability through the sustainable management of common-pool resources: a framework and potential policies’ by Brian Weeden and Tiffany Chow, researches Long-Term Sustainability issues (LTS) from the perspectives of both economics and governance, focusing on analyzing Elinor Ostrom's principles, and puts forward the main elements for a management regime. Their paper will be helpful for the international community to understand the importance of LTS, to further discussions in this field and even to shape a framework for tackling LTS. On the other hand, some of the principles raised by Ostrom still need to be clarified and deliberated throughout the international community. This commentary will analyze some of Ostrom's principles from the perspective of the 1967 Outer Space Treaty (OST) and put forward the values LTS should encompass based on an analysis of its relations with provisions in the OST.     

芳纶复合材料用湿法环氧配方的研究

在综合考虑粘度，力学性能和储存期的基础上，研制了以混合芳香胺为固化剂的芳纶用湿法环氧配方， 注浇体力学与俄，美等国家湿法环配方及我国高性能干法配方性能相当，实验证明该湿法环氧配方与Ｆ－１２纤维浸润性及界面粘接性能均较高，其ＮＯＬ环强度转化率均达８７％。     

用大面积源检定核应急机载/车载伽玛能谱仪

人工核素大面积源标准是核工业航测遥感中心等单位经过十余年研究建立的新型计量保障标准,使用该标准,可对监测核应急伽玛辐射环境的机载/车载伽玛能谱仪进行检定.使用大面积源标准检定,可以有效地弥补因机载/车载伽玛能谱仪系统的角响应影响因素复杂而难于模拟计算的缺陷,为监测核应急伽玛辐射环境的机载/车载伽玛能谱仪提供了量值传递的保障.本文介绍了大面积源检定的原理和技术方法.