SAR在飞行器组合导航系统中的应用

SAR是雷达理论和技术发展到一定阶段的基础上诞生的一种具有很高分辨率的成像雷达。它在众多领域得到了广泛的应用。在飞行器组合导航系统中,利用SAR图像进行图像匹配,可以极大地提高系统的导航精度。本介绍了SAR、组合导航系统的发展及研究现状。重点介绍了SAR在飞行器组合导航系统中的应用,并给出了具有较高精度、容错性和自主性的INS／GNSS／SAR组合导航系统的原理、结构及仿真结果。     

如何更好的设计便携式电源

LDO的选型和设计 LDO的重要技术指标 ·导通压降 定义为维持输出电压在标称值的100mV范围内时,输入电压与输出电压的最小差值.这个指标直接反映出效率和电池寿命. 静态电流/地电流(Iq或Ignd):LDO在无负载工作时自身所需要的电流,直接反映出效率.     

Event-based incremental updating of spatio-temporal database

Based on the relationship among the geographic events, spatial changes and the database operations, a new automatic (semi-automatic) incremental updating approach of spatio-temporal database (STDB) named as event-based incremental updating (E-BIU) is proposed in this paper. At first, the relationship among the events,spatial changes and the database operations is analyzed, then a total architecture of E-BIU implementation is de-signed, which includes an event queue, three managers and two sets of rules, each component is presented in detail.The process of the E-BIU of master STDB is described successively. An example of buildings incremental updating is given to illustrate this approach at the end. The result shows that E-BIU is an efficient automatic updating ap-proach for master STDB.     

伺服电机多功能综合性能测试平台系统的研制

当前对电机性能的要求越来越高,对仪器检测精度的要求也随之提高,鉴于此,构建了一套伺服电机多功能综合性能测试平台系统的整体方案,该套测试装置实现了较好的通用性和互换性,有效提升了工作效率。     

Valence electron structure of cementite phase and its interface and the tempering phenomenon

Tempering is an important phenomenon in ferrous alloys. Most steels, especially alloying steels, are used after quenching and tempering. To design the composition of quenching and tempering steels, control the tempering process more effectively, improve the properties after tempering and realize the potentials of steels, the essence of tempering process and the properties of tempering products have to be understood. In this paper, the phase structure factors and interface conjunction factors of common alloying elements in cementite and its interface are calculated out. The relationships between these valence electron structure parameters and (i) the phenomena of martensite decomposition, (ii) transformation, gathering and growth of the carbides and (iii) the mechanical properties of tempering products are built up. The nature of the effect of alloying elements on tempering process and properties of tempering products is uncovered on the level of valence electron structure. One new theoretical foundation     

镁合金纳米TiO2/Ni-P化学复合镀层的制备与性能研究

M—P／纳米TiO2颗粒复合镀层可在提高硬度的同时增强镁舍金的耐腐蚀性。本工作以硫酸镍为主盐对镁合金进行了纳米TiO2／Ni—P复合镀，并用金相法、扫描电镜（SEM）、X射线能谱（EDS）、动电位扫描等手段研究了其性能，并优化了施镀条件。结果表明，以硫酸镍为主盐可在镁合金基底上制得致密、厚度均匀、与基体结合良好的纳米TiO2／Ni—P复合镀层；复合镀层的硬度比无纳米合金镀层显著提高，但纳米颗粒加入量超过2g／L后镀层表面硬度几乎不再随加入量变化；复合镀层和合金镀层的耐腐蚀性都比基底镁合金高得多；纳米复合镀可提高镍磷合金镀层在3．5％NaCl溶液中的耐蚀性，而加入过多的纳米颗粒可以使复合镀层的耐蚀性降低。     

用示波器检修彩电的一般程序

用示波器检修彩电,不一定要遵守一些固定的步骤,但对初用示波器修彩电的人,掌握一般的检修程序则是必要的,往往可少走弯路,起到事半功倍的效果。这里用16个字对检修的一般程序作简单概括:准备工作,压缩范围,限定范围,确定故障。     

浅析液氯充装改造工程

简单介绍了液氯充装改造方案的可行性分析及实施细节,通过计算,对比分析了节能效果。     

介绍一种高铬钢的成分设计和计算方法

依据电子结构理论，应用常用合金元素在含１－０ ％ Ｃ钢中奥氏体及马氏体中的相结构因子和含１－０ ％ Ｃ 的马氏体内界面价电子结构计算的数据，设计出１ 种新的Ｃｒ２３ＳｉＭｏ 高合金耐磨钢；介绍了复合铸造承受较大的小能量多冲击和磨损的耐磨件的工艺及Ｃｒ２３ＳｉＭｏ 的性能。