Al2O3型碳/陶功能梯度材料烧蚀试验研究

Al2O3型影陶功能梯度材料作为一种新型喷管热防护材料，其具有导热系数较低及良好的隔热性能。在氧乙炔烧蚀试验条件下该材料有很好的耐烧蚀性，但由于发动机内的工作环境更为恶劣，为了更好地反映材料在固体火箭发动机中的烧蚀情况，该研究工作采用了试验发动机进行烧蚀试验。结果表明，试验发动机中获得的烧蚀率数据高于氧乙炔试验数据。文中在试验基础上分析了Al2O3型影陶功能梯度材料在发动机工作条件下的烧蚀性能及导热性能。     

火箭电气系统电缆网热防护研究

简要介绍了箭上电气系统电缆网热防护技术应用现状，阐述了一体化热防护研究的必要性，提出了轻质电缆网的芯线、绝缘层、屏蔽层、插头和热防护层有效集成的总体方案。研制热防护材料，确定热防护层结构，试制一体化热防护电缆网，模拟热环境试验，研究表明：一体化热防护电缆网满足结构减重与轻柔、可靠性提高和总装周期缩短等总体指标要求。     

对海作战无人机指挥控制系统发展综述

首先对国外无人机指挥控制系统的发展现状、趋势进行了分析,引出我国对海作战无人机指挥控制系统产品谱系、技术领域发展路线的研究需求,还分析了我国对海作战无人机的作战需求和部署模式,得出不同形态控制站的发展思路和技术路线,同时结合美军无人机指挥控制系统核心能力发展情况,提出我国对海作战无人机指挥控制系统重点技术发展规划,为我国对海作战先进无人机指挥控制装备的研发进行探索。     

Overview of current capabilities and research and technology developments for planetary protection

The pace of scientific exploration of our solar system provides ever-increasing insights into potentially habitable environments, and associated concerns for their contamination by Earth organisms. Biological and organic-chemical contamination has been extensively considered by the COSPAR Panel on Planetary Protection (PPP) and has resulted in the internationally recognized regulations to which spacefaring nations adhere, and which have been in place for 40 years. The only successful Mars lander missions with system-level “sterilization” were the Viking landers in the 1970s. Since then different cleanliness requirements have been applied to spacecraft based on their destination, mission type, and scientific objectives. The Planetary Protection Subcommittee of the NASA Advisory Council has noted that a strategic Research & Technology Development (R&TD) roadmap would be very beneficial to encourage the timely availability of effective tools and methodologies to implement planetary protection requirements. New research avenues in planetary protection for ambitious future exploration missions can best be served by developing an over-arching program that integrates capability-driven developments with mission-driven implementation efforts. This paper analyzes the current status concerning microbial reduction and cleaning methods, recontamination control and bio-barriers, operational analysis methods, and addresses concepts for human exploration. Crosscutting research and support activities are discussed and a rationale for a Strategic Planetary Protection R&TD Roadmap is outlined. Such a roadmap for planetary protection provides a forum for strategic planning and will help to enable the next phases of solar system exploration.     

复合材料电搭接分析

电搭接是指用金属编织线或金属片将机载设备的外壳与飞机基本结构连接起来,使两者处于一个共同的电位点。飞机上采用复合材料后,由于复合材料与金属之间电性能的差异,在GJB358-87中规定的搭接电阻值就不完全适用。本文在研究了大量国内外资料的基础上,根据国内目前的技术水平,对安装在复合材料结构上的机载设备,按不同的电搭接功能要求,提出了合适的搭接电阻值。     

一种再入飞行器结构的热流载荷反演方法

提出了一种基于共轭梯度法的再入飞行器热流载荷反演方法.以一维结构为例验证反演方法的有效性,并分析了材料温变热物性参数和传感器测量误差对反演精度的影响;进而针对热防护结构和返回舱结构开展了热流载荷反演分析.结果表明:本文方法能有效地反演热防护结构和返回舱结构的热流载荷;考虑材料的温变热物性参数会使得反演过程存在非线性因素...     

The statistical treatment implemented to obtain the planetary protection bioburdens for the Mars Science Laboratory mission

NASA Planetary Protection Policy requires that Category IV missions such as those going to the surface of Mars include detailed assessment and documentation of the bioburden on the spacecraft at launch. In the prior missions to Mars, the approaches used to estimate the bioburden could easily be conservative without penalizing the project because spacecraft elements such as the descent and landing stages had relatively small surface areas and volumes. With the advent of a large spacecraft such as Mars Science Laboratory (MSL), it became necessary for a modified—still conservative but more pragmatic—statistical treatment be used to obtain the standard deviations and the bioburden densities at about the 99.9% confidence limits. This article describes both the Gaussian and Poisson statistics that were implemented to analyze the bioburden data from the MSL spacecraft prior to launch. The standard deviations were weighted by the areas sampled with each swab or wipe. Some typical cases are given and discussed.     

金属热防护系统动力学建模研究

研究了金属热防护系统的动力学建模及简化计算方法.首先,给出了蜂窝结构面外的等效热导率、比热容、密度和弹性系数的表达式,并给出了算例验证;其次,建立了包括外层蜂窝、中间防热层、内层蜂窝、应变隔离层和承力结构的完整模型,研究了外表面受高温加热情况下结构的热力学响应及弯曲模态;最后,提出了带金属热防护系统的结构弯曲热模态计算...     

民机货舱防火系统验证试飞方法研究

介绍了中国民用航空规章（CCAR-25）对民用飞机货舱防火系统条款的有关要求,分析了民用飞机演示这些条款时采用的符合性验证方法及试飞注意事项,为我国大中型运输机适航试飞积累了经验。     

财产权的刑事诉讼法保护:趋势、特点与途径

财产权是世界范围内普遍承认和保护的基本人权。现代以来财产权的法律保护呈现出公法保护与私法保护相互融合的趋势,构建财产权的公法保护体系必须注重刑事诉讼中的财产权保护。刑事诉讼中的财产权保护的特点在于,它通过刑事诉讼法为当事人设定一系列的程序性权利,也即为国家设定一系列的程序性义务来控制国家权力的滥用。我国应从转变思想观念、规范涉财程序、完善救济措施等方面完善我国刑事诉讼中的财产权保护。