C/SiC刹车材料硼硅玻璃防氧化涂层的结构与性能

采用溶胶-凝胶法制备了C/SiC刹车材料硼硅玻璃防氧化涂层。用FTIR、XRD、TG-DSC研究了溶胶到玻璃的形成过程,并分析了硼硅玻璃涂层的防氧化性能及抗热震性能。结果表明,所得硼硅玻璃涂层均匀、致密,并与基体结合紧密。在800℃,硼硅玻璃涂层具有优异的防氧化性能,良好的高温稳定性和抗热震性能,尤其具有优良的耐海水侵蚀性能。在800℃氧化10 h,未经海水浸泡的涂层样失重率约为0.33%;经过海水浸泡的涂层样失重率约为2.36%。经50次热震(共氧化10 h)后,涂层保持完好,失重率约为9.79%。     

国外MEMS陀螺及组合力学环境适应性技术研究进展

针对工程使用过程中，振动、冲击和过载等力学输入造成微机电(Micro-Electro Mechanical System, MEMS) 陀螺及组合性能恶化的问题，对国外MEMS陀螺及组合力学环境适应性技术研究进展进行了梳理。从敏感结构、封装体、器件/系统层级，设计、加工工艺、封装和系统集成等角度，介绍国外主流的力学环境适应性技术方法，为国内相关技术的研究提供参考。     

俄产微电路的使用技术

从微电路引出线成形、镀锡,微电路的钎焊、安装、拆装，以及微电路的抗干扰防护等操作工序，阐述了有关俄产微电路使用的工艺技术、操作技巧和建议规定.     

Cancer risk above 1 Gy and the impact for space radiation protection

Analyses of the epidemiological data on the Japanese A-bomb survivors, who were exposed to γ-rays and neutrons, provide most current information on the dose–response of radiation-induced cancer. Since the dose span of main interest is usually between 0 and 1 Gy, for radiation protection purposes, the analysis of the A-bomb survivors is often focused on this range. However, estimates of cancer risk for doses larger than 1 Gy are becoming more important for long-term manned space missions. Therefore in this work, emphasis is placed on doses larger than 1 Gy with respect to radiation-induced solid cancer and leukemia mortality. The present analysis of the A-bomb survivors data was extended by including two extra high-dose categories and applying organ-averaged dose instead of the colon-weighted dose. In addition, since there are some recent indications for a high neutron dose contribution, the data were fitted separately for three different values for the relative biological effectiveness (RBE) of the neutrons (10, 35 and 100) and a variable RBE as a function of dose. The data were fitted using a linear and a linear-exponential dose–response relationship using a dose and dose-rate effectiveness factor (DDREF) of both one and two. The work presented here implies that the use of organ-averaged dose, a dose-dependent neutron RBE and the bending-over of the dose–response relationship for radiation-induced cancer could result in a reduction of radiation risk by around 50% above 1 Gy. This could impact radiation risk estimates for space crews on long-term mission above 500 days who might be exposed to doses above 1 Gy. The consequence of using a DDREF of one instead of two increases cancer risk by about 40% and would therefore balance the risk decrease described above.     

Vapor hydrogen peroxide as alternative to dry heat microbial reduction

The Jet Propulsion Laboratory (JPL), in conjunction with the NASA Planetary Protection Officer, has selected vapor phase hydrogen peroxide (VHP) sterilization process for continued development as a NASA approved sterilization technique for spacecraft subsystems and systems. The goal was to include this technique, with an appropriate specification, in NASA Procedural Requirements 8020.12 as a low-temperature complementary technique to the dry heat sterilization process.     

高校综合防雷技术及解决方案研究

本文探讨了雷电灾害的原因及目前高校采用的主要防雷措施,详细分析了雷电防护的主要技术,最后以中国石油管道学院为例,探讨了高校综合防雷方案,把防雷技术理论应用到了实际工程中。     

电子系统的电磁脉冲效应及防护

电磁脉冲对电子系统具有很强的干扰和破坏作用.为研究电磁脉冲对电子系统的影响,进行了静电放电电磁脉冲对单片机系统的辐照效应实验.实验表明,单片机系统在静电放电电磁脉冲作用下,会出现多种故障现象.在效应实验基础上,研究了单片机加固技术.     

民用飞机线束电弧问题研究

描述了电弧的概念、特点、产生机理及危害。从民用飞机电气线路互联系统(EWIS)布线安装设计的角度出发,深入分析了线束电弧产生的主要原因,即导线绝缘层的物理破坏和老化。在借鉴国际通用技术规范和型号研制经验的基础上,针对可能导致电弧产生的因素,提出了具体的电弧防护措施,有助于在布线安装设计初期,最大程度上减小电弧产生的隐患。同时,针对民用飞机设计单位构建线束电弧防护设计体系提出相应建议,为线束设计人员提供参考。     

日本铁矿石资源战略模式对我国的启示

在解析日本铁矿石资源现状的基础上,进一步梳理了日本铁矿石战略模式,将其总结为两个基础（获得海外权益矿、铁矿石战略储备制度）、四个保障（政府支持、法律保障、海运配套及技术支持）和多方互动;并指出对我国铁矿石战略的五大借鉴意义。     

我国直升机抗坠毁试验技术发展现状及展望

直升机抗坠毁技术是直升机研制中的五大关键技术之一,而抗坠毁试验是验证这一关键技术的重要途径与手段.详细介绍了国外抗坠毁试验技术的发展,对国内近年来开展的抗坠毁试验技术研究工作进行了综合阐述分析,指出了今后我国直升机抗坠毁试验技术的一个重要研究与发展方向.