Formation of composites fabricated by exothermic dispersion reaction in A1-TiO2-B2O3 system

The formation of aluminum matrix composites fabricated by exothermic dispersion reaction in A1-TiO2-B2O3 system was investigated. The thermal analysis results show that the reactions are spontaneous and exothermic. The Gibbs free energy of α-Al2O3 is the lowest among all the combustion products, followed by TiB2 and Al3Ti. It is noted that when the B2O3/TiO2 mole ratio is below 1, the reaction products are composed of particle-like α-Al2O3, TiB2 and rod-like Al3Ti. The α-Al2O3 crystallites, resulting from the reaction between A1 and TiO2 or B2O3, are segregated at the grain boundaries due to a lower wettability with the matrix. SEM micrographs show that rod-like Al3Ti phase distributes uniformly in the matrix. When the BEO3/TiO2 mole ratio is around 1, the Al3Ti phase almost disappears in the composites, and the distribution of α-Al2O3 particulates is improved evidently.     

液罐汽车转弯制动稳定性的研究

该文研究罐装部分液体汽车在转弯制动工况下，由于液体货物质心位置的变化对行驶稳 定性的影响。文中建立了有关力学模型和数学模型，分析研究了罐体内装载不同量液体对汽车转弯制动时横摆角速度的影响规律。     

无线电引信被干扰率及抗干扰率

本文从无线电引信相对杀伤比率出发，引伸出引信被干扰率及抗干扰率的定义及计算公式。     

莲花水电站机组功率自动调整经验

通过对莲花水电站机组有功、无功功率自动调整的方案选择和软件编制等经验进行总结，得出用开关量输出，对微机电调和微机励磁调节器进行有功、无功自动调节控制和正常停机自动减载跳闸停机，这种方式比较简单、可靠、实用。     

电制动停机装置在陈村水电站的应用

陈村水电站于１９８７年开始使用电制动停机装置，到１９９２年投用成功率达９６％以上。是国内全部采用电制动停机且连续正常运行时间最长的电站之一，本文简单介绍了电制动原理，重点介绍了电制动装置在陈村水电站运行情况以及提高电制动可靠性的做法，最后叙述了电制动装置应用的体会和今后值得注意的问题。     

单片机控制的多功能纸张定量仪系统的设计

文章介绍一种单片机控制的多功能纸张定量仪的设计思想以及在设计中采用的多种方法和技术。     

M8810等磨床制动系统的改进

Ｍ８８１０等磨床制动系统的改进山东文登轴承厂（２６４４００）孙国兵，王树兴叙词磨床，制动操纵机构Ｍ８８１０、Ｍ８８２０、Ｍ８８０４Ｋ和Ｍ８８１４Ｋ等轴承沟道磨床，目前在一些企业中仍有相当数量，我厂尚有１１台正在使用。这几种机型的磨架制动系统，原采用机...