Ca的掺入对复合氧化物LaFeO3和LaMnO3的结构及电性的影响

用柠檬酸法、固相法制备了替代的复合氧化物Ｌａ１－ｘＣａｘＦｅＯ３及Ｌａ１－ｘＣａｘＭｎＯ３。对样品进行了ＸＲＤ及导电能力测试。结果表明：Ｘ≤０．５，复合氧化物为单相的钙钛矿结构；Ｃａ的掺入，改善了ＬａＦｅＯ３导电性能，使其室温电阻率从６×１０＾４Ω·ｃｍ降低到１０Ω·ｃｍ左右；而对ＬａＭｎＯ３的影响不大，其室温电阻率在１０＾－１Ω·ｃｍ左右。     

用神经网络法编程加工轮毂上特殊曲面的探讨

根据轮毂上曲面的特殊性,提出了采用神经网络方法进行编程,实现数控加工,以取代传统的加工方法的设想。     

一种先进复合材料件无损检测的探讨

一种先进复合材料受力件的制品,如何检测内部是否有分层脱胶,曾遇到很大的困难。本文阐述如何结合实际解决这一难题,从而免受重大损失。     

用高速纹影摄影技术观测自由面微物质的喷射

本文介绍了适于爆轰实验研究的透射式高速纹影仪。该设备具有较高的测试灵敏度。应用它观测了铅和钢样品自由面的微物质喷射现象,取得了好的结果。     

Unification and comparison between two concepts of radar targetangular glint

This paper provides a general proof of unification between two concepts of radar target angular glint. The analysis of a two-point target model, consisting of an electrically and magnetically ideal dipole, shows the relation, difference, and equivalent condition between them more clearly. Angular glint has been synthesized from the measured data of radar echo phase, and compared with the theoretical result     

轮廓仪的多参数微机测量系统

介绍了“轮廓仪的多参数微机测量系统”的构成和技术指标，阐述了设计硬件电路和编制数据处理软件的方法，最后对系统的测量精度进行了测试与比对。     

Performance of a two-layer LEO satellite communication network

A novel two-layer low Earth orbiting (LEO) satellite network is proposed. Comparing with a single layer global network, not only the system performance is improved but also the number of satellites can be reduced. The main ideas include (1) to raise the altitude of the original global network, and (2) to add several satellites at lower altitude to form a regional network to serve calls from the areas of heavy traffic. In order to fully utilize the benefits of the two-layer network, additional functions such as adjustable beam and dynamic channel management are added. Call blocking rate is derived. Numerical examples are provided to demonstrate several interesting phenomena.     

大气行星波对LF和VLF无线电波传播的影响

本文采用最大熵谱估计方法,对1985-1987年三个冬天,在东半球(20°S—65°N、13°E—141°E)白天观测的LF和VLF电波相位、幅度、卫星观测的Ly-α射线通量及高纬上空的行星波活动等大量资料,进行了熵谱分析。观测及分析结果表明:(1)LF和VLF电波的相位具有2—2.2天、3—4天、6—12天、12—20天、20—32天周期范围的行星尺度扰动.Ly-α射线辐射通量主要具有20—32天周期范围内的波动.(2)发现在中纬地区冬天观测的LF电波幅度大的扰动与高纬60°N上空观测的行星波H_1的变化规律非常一致. 波形结构的主要峰和谷几乎完全对应,仅在时间上前者约滞后3—4天.计算给出两者的相关系数在0.65—0.85之间.根据观测事实和谱分析结果对比,作者认为LF和VLF电波相位、幅度周期在20天以上的扰动主要受太阳Ly-α辐射通量变化的控制.冬天其周期在2—20天范围内的扰动,主要受来自对流层和下平流层中激发的大气行星波的影响.     

An output feedback controller for a synchronous generator

A novel approach using eigenstructure assignment is developed for the design of excitation controllers for synchronous generators. The computation procedure for the method is easy to apply, and an exact solution can be obtained without iteration. Controllers designed by the proposed approach can be easily implemented by means of proportional-integral (PI) controllers. Practical considerations in reaching an optimum selection of closed-loop eigenvalues are addressed. Time-domain simulation results are presented to verify the effectiveness of the design method     

The application of remote sensing techniques to regional geological survey in China

Information is provided on the applications of remote sensing to regional geological survey and mapping on medium and small scale over recent years in China. The work began from establishing interpretation key for strata, magmatic rocks and regional structures. Preliminary results have been obtained. It is explained through case histories in Sichuan Province and Xinjiang Uygur Autonomous Region. By means of remote sensing the time of compilation has been shortened and the cost was reduced, the accuracy and quality of geological maps was improved, and abundant basic geological data were provided for exploration. In addition, prediction of various ore targets were defined along with new ideas for geological scientific research.