ATC系统中采用电力线载波通信技术的研究

介绍了正交频分复用(OFDM)的基本原理，并结合城市轨道交通ATC系统的特点，提出了利用基于OFDM的电力线载波通信技术在接触网上实现信息传输的思路。     

城市轨道交通信息通信系统技术

针对城市轨道交通系统的特点，介绍了城市轨道交通信息通信系统的各个分系统技术，包括：传输系统，公务电话系统，专用电话系统，广播系统，电视监控系统，电源系统，时钟系统，无线通信系统。     

柴油机掺烧气体燃料的低负荷性能试验研究

采用试验方法研究柴油机低负荷工况掺烧LPG和CNG燃料的经济性和排放性能,探讨气体燃料掺烧比例、喷油提前角和压缩比对低负荷性能的影响,研究表明,柴油机低负荷掺烧气体燃料会导致燃烧室温度下降、燃烧不良、经济性下降和HC排放急剧增加,因此,减少气体燃料掺烧比例、增大喷油提前角、减小喷油器的喷孔直径和适当增大压缩比,有利于改善柴油机掺烧气体燃料的低负荷性能。     

Delay Restoration of Single-Track Railway Rescheduling

On the basis of analysis of the principle of delay restoration in a disturbed schedule, a heuristic algorithm for rescheduling trains is developed by restoring the total delay of the disturbed schedule. A discrete event topologic model is derived from the original undisturbed train diagram and a back propagation analysis method is used to label the maximum buffer time of each point in the model. In order to analyze the principle of delay restoration, the concept of critical delay is developed from the labeled maximum buffer time. The critical delay is the critical point of successful delay restoration. All the disturbed trains are classified into the strong-delayed trains and the weak-delayed trains by the criterion of the critical delay. Only the latter, in which actual delay is less than its critical delay, can be adjusted to a normal running state during time horizon considered. The heuristic algorithm is used to restore all the disturbed trains according to their critical details. The cores of the algorithm are the iterative repair technique and two repair methods for the two kinds of trains. The algorithm searches iteratively the space of possible conflicts caused by disturbed trains using an earfiest-delay-first heuristics and always attempts to repair the earliest constraint violation. The algorithm adjusts the weak-delayed trains directly back to the normal running state using the buffer time of the original train diagram. For the strong-delayed trains,the algorithm uses an utility function with some weighted attributes to determine the dynamic priority of the trains, and resolves the conflict according to the calculated dynamic priority. In the end, the experimental results show that the algorithm produces ＂good enough＂ schedules effectively and efficiently in disturbed situations.     

燃料电池客车

国际锌协会和国际锌能储存技术联合会在上海希尔顿大酒店联合主办首届国际锌空燃料电池研讨会。在这一研讨会上，上海博信电池有限公司展示了由该公司设计制造的世界第一辆纯锌空燃料电池驱动低地板电动城市客车样车，该车连续行驶里程已超过320公里。[编者按]     

先张法中等跨径低高度连续箱梁的研究与应用

本文提出了中等跨度桥梁结构的新型式低高度连续箱梁，与简支空心板技术和经济比较有明显的优点，并进行了多座桥梁的实践与应用，具有很好的推广应用前景。     

柴油主机气缸油消耗率的计算及控制

柴油主机气缸油消耗的多少不仅影响柴油机气缸内缸套和活塞环的磨合润滑，而且和船公司的营运成本密切相关。此文通过对气缸油消耗率的计算及控制分析，以便轮管人员对此有比较正确的认识，尽可能避免在这方面的操作失误，并为船公司争取较好的经济效益。     

兰新线疏乌段光缆在线监测系统

结合兰新铁路采用的光缆网络监测系统介绍了光缆在线监测系统的组成原理及工程中应注意的问题。     

铁路运输信息网的安全保障

随着铁路运输向网络化、信息化、现代化发展,铁路信息网的正常、高效的运行显得越来越重要。那么如何从既有网络着手,构建一个安全可靠、顺畅高效的铁路运输信息化网络呢?本文试图就此作个简要介绍。