载人航天过程中人的可靠性研究

从失误分析、理论研究及可靠性预测三方面详细分析了人的可靠性研究现状 ,在此基础上 ,指出其未来主要的发展方向与手段。最后 ,认为必须从人、机、环境三个方面进行综合考虑来提高航天员的可靠性。     

Intelligent Silent Zone for Source-Location Privacy Based on Context-Awareness in WSNs

In many wireless sensor networks(WSNs)applications,the preservation of source-location privacy plays a critical role in concealing context information,otherwise the monitored entities or subjects may be put in danger.Many traditional solutions have been proposed based on the creation of random routes,such as random walk and fake sources approach,which will lead to serious packet delay and high energy consumption.Instead of applying the routing in a blind way,this article proposes a novel solution for source location privacy in WSNs by utilizing sensor ability of perceiving the presence a mobile attacker nearby,for patient attackers in particular to increase the safety period and decrease the data delivery delay.The proposed strategy forms an intelligent silent zone(ISZ)by sacrificing only a minority of sensor nodes to entice patient attackers away from real packet routing path.The analysis and simulation results show that the proposed scheme,besides providing source location privacy energy efficiently,can significantly reduce real event reporting latency compared with the existing approaches.     

基于红外图像的返回舱被动测距

针对飞船返回段光学设备不能测距的问题,提出一种基于红外序列图像处理的返回舱被动测距方法。该方法选择主伞作为测量对象,利用最小外接矩形算法实现主伞轮廓图像测量,然后基于小孔成像理论,建立返回舱被动测距模型。为了减小图像噪声及边缘模糊对测量精度的影响,使用了前站引导数据修正以及距离值分段拟合等手段。实验结果表明,在没有连续云层遮蔽情况下,该方法对返回舱距离测量是可靠的和有效的。     

利用OpenGL显示叶轮造型及模拟加工

分析了OpenGL编程原理以及OpenGL与Windows图形设备接口GDI之间的关系,介绍了OpenGL进行叶轮造型显示及虚拟加工的应用方法.     

异面压缩下六边形铝蜂窝平均塑性坍塌应力研究

为了研究铝蜂窝在准静态异面压缩下的平均塑性坍塌应力，基于简化的基本折叠单元理论，以单个完整铝蜂窝六边形单元为研究对象，根据能量守恒定律，形成一个基本折叠单元外力所做的功等于屈曲能和膜能的总和，由此分别假设铝蜂窝材料服从Tresca屈服准则或Mises屈服准则，给出了两个准静态异面压缩下铝蜂窝平均塑性坍塌应力的理论计算公式，试验结果验证了理论推导的正确性。提出的公式对研究铝蜂窝的异面压缩性能具有一定的工程指导意义。     

Soil moisture mapping over the Chinese Loess Plateau using ENVISAT/ASAR data

In this paper, we used the available algorithm for soil moisture estimation over LOPEX05 (the Loess Plateau land surface process Experiment (2005)) area. The available algorithm used ENVISAT/ASAR AP mode VV polarization observational data at a low incidence angle and ground measured soil moistures. The ground measurements were performed in the summer of the 2005 during the LOPEX05 field campaign. The validated results indicate that an average difference between the soil moistures estimated from the microwave remote sensing and ground measurements is less than 0.02 cm³/cm³, with a RMS error of 2.0%, and a maximum less than 0.04 cm³/cm³. The algorithm was applied to the surface soil moisture mapping later. The results show that this algorithm is suitable for monitoring soil moisture information of the agricultural fields over the Chinese Loess Plateau, when ground land cover situation and the resolution of imagery data are taken into account. However, we also find that there are large differences over the steep slope region, the edge of mesa. The results are not acceptable for surface soil moisture estimation in these regions. Thus, the surface soil moisture retrieval in the steep slope region of the Loess Plateau need to be further investigated in the future.     

我国计量行业法规政策和发展趋势分析

计量是实现单位统一、保证量值准确可靠的活动，关系国家安全、国计民生。为夯实计量基础、提升计量能力，抓住计量事业发展的新机遇，本文从行业法规政策、计量发展趋势等方面开展相关研究，为从事计量管理和技术研究工作的人员提供参考。     

高空模拟试车台空气加温炉改造方案研究

以高空模拟试车台空气加温炉为研究对象,利用数值模拟方法对加温炉燃烧特性、出口空气温度等进行了计算和分析.结果表明:现有空气加温炉由于采用自然进气方式,热能利用率仅为0.2左右.在此基础上,结合高空模拟试车台改造要求,对该加温炉改造方案进行了重点研究.改用三台燃烧器方案后,可有效提高加温管出口空气温度的均匀性,温差基本控制在8K内；合理选择燃烧器安装位置及炉壁辐射参数,加温炉的热能利用率可达0.4以上.     

多值逻辑函数最小化的McCluskey—Quine方法改进及程序实现

多值逻辑电路的发展，使得以往的化简方式已不能适应电路取值的增高和函数项的增加。本文以三变量三值函数为例，讨论了多值逻辑电路化简的物理背景，采用改进的McCluskey-Quine方法进行最小化的算法，以及质蕴含项覆盖问题的求解，并给出了程序流程。由于该程序采用的面向对象技术，经过适当扩展可以应用于多变量多值函数。