卫星质心三轴快速测量配重新工艺

文章介绍在某型号的结构星质心测试中,克服了传统工艺的局限性,采用了新的测试工艺,利用倾斜法对卫星三个坐标轴上的质心位置进行快速测量并配重,节省了时间,在实践中取得了很好的效果。     

网络中心战中服务质量选路的研究

介绍了网络中心战的概念和网络中心战架构中分布式无主节点网络体系结构,提出了网络中心战的业务需求模型。在综合分析网络资源状况和服务质量度量参数的基础上,结合网络中心战对实时性要求较高的特性,提出了以探测器到火力控制单元的网络时延作为服务质量选路标准。以3节点旅（团）级网络中心战演示实验平台为例,提出了一种计算网络中心战架构中端到端时延和获取路径信息的算法,开发了Server／Client架构计算程序,选取探测器到火力控制单元之间的最小网络时延的链路作为最优路径。解决了网络中心战中路由选择的关键问题,满足了网络中心战对时延的要求,并且可用于多业务点提供业务时最优路由的确定。     

TDICCD相机像质综合评价研究

基于对影响航天相机成像质量诸多因素的综合考虑,文章试图从一个新的角度提出用MTF与SNR的乘积大于或等于9来综合评价航天相机成像性能的方法,为研制轻型航天相机提供参考。     

航空军工产品实验室环境鉴定试验工作情况分析（1）

文章分为两部分。此为第一部分,主要阐述了军工产品定型试验分类和目的,特别是航空军工产品地面鉴定试验的基本内容;着重分析了实验室环境鉴定试验的地位和作用,指出在其实施和管理过程中的复杂性。这部分还介绍了承试实验室资质、试验设备使用和管理、试验大纲和试验报告等文件编写和质量控制方面存在的问题,进行分析并提出改进建议。     

星载ScanSAR天线指向稳定度对辐射校正的影响

基于均匀加权天线模型,推导星载ScanSAR天线指向不稳定引起的多普勒中心频率估计误差,建立多普勒中心频率估计误差与图像辐射校正精度之间的数学模型,进而提出星载ScanSAR辐射校正对天线指向稳定度的要求。最后,通过计算机仿真,验证了理论分析的正确性。     

一种星载高相位中心稳定度双频GPS天线

介绍一种用于星载的变形十字交叉振子圆极化天线,通过对普通十字交叉振子天线进行改进,展宽了天线的工作带宽,使该天线能同时工作在GPS的L1和L2两个频率上。该天线结构简单,除了支撑材料外,整个天线由金属构成,易于满足星载的环境要求。该天线具有很高的相位中心稳定度,在要求的波束范围内天线的相位中心稳定度小于2mm,达到了国外同类产品的水平。仿真及实测结果表明,设计实用、可行。文中还研究了天线相位中心的测试方法和数据处理方法,并应用到实际测试中。     

Measurements of the radiation quality factor Q at aviation altitudes during solar minimum (2006–2008)

In radiation protection, the Q-factor has been defined to describe the biological effectiveness of the energy deposition or absorbed dose to humans in the mixed radiation fields at aviation altitudes. This particular radiation field is generated by the interactions of primary cosmic particles with the atoms of the constituents of the Earth’s atmosphere. Thus the intensity, characterized by the ambient dose equivalent rate H∗(10), depends on the flight altitude and the energy spectra of the particles, mainly protons and alpha particles, impinging on the atmosphere. These charged cosmic projectiles are deflected both by the interplanetary and the Earth’s magnetic field such that the corresponding energy spectra are modulated by these fields. The solar minimum is a time period of particular interest since the interplanetary magnetic field is weakest within the 11-year solar cycle and the dose rates at aviation altitudes reach their maximum due to the reduced shielding of galactic cosmic radiation. For this reason, the German Aerospace Center (DLR) performed repeated dosimetric on-board measurements in cooperation with several German airlines during the past solar minimum from March 2006 to August 2008. The Q-factors measured with a TEPC range from 1.98 at the equator to 2.60 in the polar region.     

Characterizing bedrock lithologies using Small Crater Rims and Ejecta Probing (SCREP)

This paper describes the rationale, methodology, and importance of focusing on the rim and proximal ejecta of small (<5 km in diameter), immature impact craters to explore an underlying crustal lithology. Small Crater Rim and Ejecta Probing (SCREP) describes a methodology and application program that extracts bedrock spectral and compositional information from a remote sensing image. Extracted data can yield the pristine lithologies of a planetary crust that would otherwise be obscured by the products of space weathering processes. SCREP was developed with lunar data, specifically Clementine multispectral image mosaics, therefore the technique is discussed in this context. However, its application to other airless solar system bodies is apparent. Knowledge of the pristine bedrock compositions of a planetary crust provides insight into geological surface processes, which can be used to refine models of planetary interiors and their evolution.     

高职生就业心理问题分析及调适对策

高职生就业时存在着焦虑、不满、自卑、从众、攀比、盲目等心理问题,其成因是对自我和对环境认知度较低。要消除高职生就业时的心理问题必须从学校教育着眼,加强对学生的职业心理品质培养和职业生涯规划教育是解决高职毕业生心理问题的有效方法。     

英美文学教学中人文素养的渗透

在英美文学教学中,教师要着力于开发文学作品中的人文因素,结合中国的文化主流价值观,有目的地影响、培养、提高学生的人文素养。