Dynamic Behavior of Double-Row Pre-stressed Anchor Piles under Earthquake Conditions

To investigate the seismic performance of the double-row pre-stressed anchor piles (DRPAPs) on the Yuxi-Mengzi railway, FLAC3D was used to construct a three-dimensional model. Using Koyna earthquake records as input motions, dynamic time-history analyses were carried out. In the analyses, we compared earth pressure on the front and back of the piles and deformation of the piles under different seismic forces with or without anchor cables. With the anchor cable present, the earth pressure on the back of the pile s free section increases, but that on the back of the pile s anchorage section decreases. Also, with anchor cables, the earth pressure on the front of the upper pile decreases, and that on the back of the lower pile decreases.     

Algorithm for Extracting All Relative-Attribute Reducts in Decision System of Large-Scale Records

A new algorithm based on rough core was proposed to extract all relative-attribute reducts in decision information systems of large-scale records. In the algorithm, the rough core of the decision-making information system is first calculated. Then, an approach based on a top-down strategy is adopted to select the non-core condition attributes and generate candidate relative-attribute reducts. Finally, the set of all relative-attribute reducts is obtained by pruning the candidate relative-attribute reducts. Experimental results show that the proposed algorithm is superior to the other methods such as the algorithm without computing core, the exhaustive method and the discernibility matrix method in extracting all relative-attribute reducts for large-scale data sets.     

谈谈汽车零件的拆卸技巧

汽车零件的拆卸是汽车维修人员的基本功，有人说：拆卸修理工，技术就在拆卸中。机件拆卸的顺利与否，直接关系到汽车维修的速度和质量，技术过硬的维修人员十分讲究拆卸技巧。     

LKJ—93型列车运行监控记录装置袖珍式转储器的研制

简述了ＬＫＪ－９３型列车运行监控记录装置的功能，对袖珍式转储器的性能、原理及使用方法等作了介绍。     

基于微处理器的电气量自动记录装置的研究

文章叙述了智能电量记录表的研究开发目的、应用前景及关键技术等.     

机务行车安全信息管理研究与实践

机务行车安全是铁路安全运输的基础。八十年代后，计算机控制与信息技术的飞速发展给机务行车安全技术与管理带来了令人振奋的变化，其中最具代表性的是机车运行监控记录装置推广应用。该装置具有独特的自动记录功能，可将记录数据经地面计算机处理、分析、统计后再现列车运行状态。因此，如何有效地组织与利用这些记录信息，强化机务行车安全管理与监测行车安全设备运行情况，提高科学管理水平和设备质量，是一个新课题，也是机务行车安全工作的新领域。     

郑武线LKJ—93型列车运行监控记录装置的监控方案设计

分析了郑武线轨面信号制式情况，介绍了ＳＪ－９３机车信号，提出了ＬＫＪ－９３型列车运行监控记录装置在郑武线的监控方案，并且将ＬＫＪ－９３与ＴＶＭ３００的监控模式进行了分析比较。