飞机机身近区电磁散射建模研究

采用物理光学法和一致性几何绕射理论，分析机身各 球面波照射下的近场电磁散射特性几何绕射并建立其雷达散射截面（ＲＣＳ）数学模型，同时对于复杂机身的前部，采用面元油、即采用双三次Ｂ样条技术对机外形进行拟合，然后再用一致性几何绕射理论进行计算。种方法具有一定的可信度。     

基于决策支持系统的高校人事管理信息化建设

人事管理信息化程度影响着高校人事工作效率和人事决策的实施,以决策支持系统的视角来研究高校人事管理信息化,对进一步加快人事管理的现代化进程、促进人事管理信息系统的建设,最终实现高等学校人事管理的全面信息化具有重要的理论和现实意义.     

B2C电子商务中信号机制的建立

首先提出双向信息不对称问题是制约B2C电子商务发展的关键,通过对信号传递理论的研究成果进行归纳,总结出建立B2C电子商务中信号机制需要符合的条件,并建立起B2C中信号机制的模型,即企业传递信号—消费者甄别的信号机制和消费者传递信号—企业甄别的信号机制。     

基于DS18B20的数字温度测量仪

介绍了DS18B20-线式数字温度传感器的功能特性和结构特点，分析了其工作时序，结合AT89S51给出了数字式温度测量装置的系统结构、硬件接口电路和软件设计方法。     

Corrosion Inhibition of SiC_p/5A06 Aluminum Metal Matrix Composite by Cerium Conversion Treatment

This article studies the effects of the CeCl₃ concentrations in conversion solutions with and without addition of NaCl, pH-values of conversion solution, drying temperature, time and temperature of immersion on the Ce-conversion coatings for corrosion protection of the SiC_p/5A06 Al-MMC and 5A06 Al-alloy in the 3.5% NaCl aqueous solution at room temperature. Potentiodynamic polarization tests reveal that the Ce-conversion treatment could markedly improve the pitting corrosion resistance of the composite and the matrix alloy in chloride containing environment. The best corrosion resistance effects are obtained for the samples treatment in 1‰ CeCl₃·7H₂O/ 3.5% NaCl solution at 45 °C for 60 min, followed by drying at 100 °C for 30 min. Examinations by means of scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) indicate that this behavior is due to the precipitation of Ce-oxides/hydroxides on the cathodic intermetallics and the Al-oxide film on the rest of the metal matrix.     

飞行器空中回收

文中详细介绍了飞行器空中钩取的回收方法和空中钩取作业的主要技术关键。     

2. 5D 衍生结构SiO2 f / SiO2 复合材料的经向力学性能

以几种不同的2.5D衍生结构织物为增强体,制备了法向增强、经向增强及经法向增强2.5D Si O2f/Si O2复合材料,比较了上述材料与现有2.5D Si O2f/Si O2复合材料的经向力学性能,并研究了经法向增强2.5D结构复合材料中增强纱比例、纤维体积分数与材料性能之间的关系,对织物结构进行了优化。结果表明,经法向增强2.5D Si O2f/Si O2复合材料的经向力学性能较现有2.5D复合材料有显著提高,该材料在较低密度下(1.6 g/cm3),经向拉伸强度与现有材料(1.65 g/cm3)持平,且经向压缩强度接近现有材料的4.3倍。     

Ground experiments of Chang’e-5 lunar regolith penetrating radar

The Lunar Regolith Penetrating Radar (LRPR) is an Ultra-Wideband (UWB) array-based Ground penetrating radar (GPR) onboard the lander of Chang’e-5 (CE-5) mission. The primary scientific objectives of the LRPR are to probe the thickness and structure of lunar regolith of the landing site, and support the drilling and sampling process. In order to evaluate the performance of the LRPR, a series of ground experiments are performed using the LRPR prototype mounted on a CE-5 lander model. The performance of the LRPR is evaluated by comparing the experimental data with the simulated data. Data processing and imaging method are verified, and the interferences from the lander and other aspects are analyzed. The results of the ground experiments and simulation demonstrate that the LRPR is able to meet the design requirement of 2-m detection depth. They also indicate that the upper and lower interfaces of the stratified structure in the lunar regolith can be well distinguished by the LRPR when the dielectric constant difference is greater than 0.3, and the imaging effect of the location under the dense antennas is better than that of other positions. However, the identification capability of the LRPR to the independent blocky objects is relatively poor mainly due to the clutters caused by the lander, the sparsity of the antenna elements compared to the size of the basalt block, the limited aperture of the antenna array, and the tail of the transmitted waveform.     

一种用于ISA总线计算机1553B接口模块的设计

介绍一种用于ＩＳＡ总线计算机的低成本的１５５３Ｂ总线接口模块的设计,该设计使得１５５３Ｂ终端具有与美国ＤＤＣ－ＩＤＥＡ产品类同的功能,可进行１５５３Ｂ产品或系统的开发、仿真。简要介绍了模块的硬件设计和软件配置,罗列了其设计特点。     

B／Al单向铺层复合板的力学性能及断裂行为的研究

研究了热压扩散结合工艺对Ｂ／Ａｌ复合材料的强度的影响,并对试样拉伸断口及断裂径进行了研究,分析表明,试样断口有三种断裂模型,断裂路径同热压工艺有密切的关系。