高温热处理与C/C复合材料性能关系研究

采用整体炭毡为增强坯体,经过化学气相渗透(CVI)及树脂浸渍/炭化(PIC)工艺制备成整体毡C/C复合材料样品,对样品连续进行了3次2 500℃以上的高温热处理(HTT)。材料性能测试结果表明,3次HTT后材料z向抗拉强度由16.7MPa下降到8.87MPa,抗压强度由129.0MPa下降到72.7MPa,抗弯强度由35.7MPa下降到17.6MPa,抗剪强度由34.4MPa下降到18.7MPa;xy向室温(RT)~1 000℃的平均线膨胀系数由1.55×10-6K-1降低到1.13×10-6K-1;800℃的热导率由106.91 W/(m.K)降低到61.27 W/(m.K),比定压热容由2.56 kJ/(kg.K)下降到1.93 kJ/(kg.K);z向变化趋势基本相同。     

大气等离子喷涂纳米ZrO2涂层工艺与性能研究

以结合强度为测试指标进行正交试验,优化出纳米ZrO2热障涂层喷涂的最佳工艺参数,并对该涂层的结合强度、抗热震性能及隔热性能进行了试验研究。试验结果表明,经优化工艺喷涂的涂层结合强度可达33 MPa;抗热震性能好,1050℃水冷试验中,涂层可经历22次左右的热震循环;隔热效果明显,火焰与涂层表面以及涂层表面和试样背面随着火焰温度不同,分别具有300~600℃和100~200℃左右的温差。     

带电粒子辐照对热控涂层的光学性能退化影响

带电粒子辐照将引起材料折射率和消光系数的变化。文章首先介绍了带电粒子在热控涂层中的剂量深度分布,接着利用渐变折射率概念建立了剂量深度分布和材料折射率与消光系数的关系,给出了热控涂层光学性能变化的分析模型,最后对这一理论的应用进行了讨论。     

舰载机CRM培训体系研究

针对人为因素对航空安全的影响,介绍了目前世界各航空大国广泛开展的机组资源管理（CRM）的涵义,探究了CRM训练在军用航空中的发展与应用,提出了构建舰载机CRM培训体系的设想,为国产舰载机的安全飞行提供了一定的参考。     

An Empirical Study of the Effect of Metacognitive Strategy Instruction on Listening Comprehension

The paper tries to apply meta-cognitive strategy training to English listening comprehension teaching. It also aims at helping students choose appropriate meta-cognitive strategies to accomplish specific listening tasks, which may hopefully facilitate students' listening comprehension. Data analysis proves that strategy training helps improve students' listening comprehension.     

论物业税对我国房地产市场的影响

伴随着我国房地产业的快速发展，物业税是否开征已引起社会各界的普遍关注。文章在界定物业税概念的基础上，重点探讨了我国物业税的构成内容，认为我国房产税可等同于物业税。最后就开征物业税对我国房价、购房者、地方财政和房地产开发商的影响进行分析。     

Simulation of the MELiSSA closed loop system as a tool to define its integration strategy

Inspired by a terrestrial ecosystem, Micro-Ecological Life Support System Alternative (MELiSSA) is a project focused on a closed-loop life support system intended for future long-term manned missions (Moon and Mars bases). Started by the ESA in 1989, this 5-compartment concept has evolved through a mechanistic engineering approach designed to acquire both theoretical and technical knowledge. In its current state of development, the project can now start to demonstrate the MELiSSA loop concept at pilot scale. Thus, an integration strategy for a MELiSSA Pilot Plant (MPP) has been defined, describing the different test phases and connections between compartments. The integration steps are due to be started in 2008 and completed with a complete operational loop in 2015. The ultimate objective is to achieve a closed liquid and gas loop fulfiling 100% of oxygen requirements and at least 20% of food requirements for one-man. Although the integration logic could start with the most advanced processes in terms of knowledge and hardware development, this logic needs to be expanded to encompass a high-level simulation policy. This simulation exercise will make it possible to run effective demonstrations of each independent process, followed by progressive coupling with other processes in operational conditions mirroring as far as possible the final configuration.     

基于CST参数化的翼型优化遗传算法研究

用外形建模的CST参数化方法,构建翼型几何可直接利用其后缘角、前缘半径等几何特征,其控制参数更能反映翼型特有的气动敏感性,有助于遗传算法搜索寻优。基于这一参数化方法,结合遗传算法,构造了用于翼型优化的设计方法。算法中,CST控制参数作为设计变量,采用二进制编码,并通过引入精英策略,提高了遗传算法的收敛性能。算法适应度评估涉及的流场求解则采用了基于Jameson有限体积法的Euler方程解算程序。先以NACA0012翼型为例,以其某一已知的表面压力分布为目标,进行了遗传算法的重构运算,给出了重构的翼型几何外形,验证了方法。在此基础上,进行了带约束的跨音速翼型优化设计,给出了升力系数极大化和阻力系数极小化等设计算例,展示出翼型优化设计的效果。     

板料n,r值对钣金零件成型工艺的影响

本文详细论述了板料成型性能指数ｎ，ｒ值的物理意义及其对各种钣金元件成型工艺性的影响，结合典型成型工艺，利用钣金冷压成型原理，对ｎ，ｒ值的具体影响进行了分析研究腹出了一些针对具体成型工艺的一般规律性的结论。将本文的一些概念和分析研究的结果同具体的生产实践相结合，则会对促进生产和提高成型件的质量有一定的指导意义。     

T250与30CrMnSiA异种材料焊接工艺技术

从冶金方面分析了T250与30CrMnSiA材料焊接工艺性。通过手工钨极氩弧焊焊接工艺研究试验,选择焊丝材料,确定材料焊接状态,制定了合理有效的焊接工艺规范和措施。采用光学金相显微镜、维氏硬度测试和力学性能检测等手段,对T250与30CrMnSiA异种材料焊接接头金相组织、力学性能和显微硬度等方面进行详细分析。结果表明,T250和30GrMnSiA异种材料具有良好的焊接性,填充HT250焊丝,采用热输入量较小的焊接电流进行焊接,接头强度与30GrMnSiA材料强度相当。