“中原之星”电动车组信息显示系统

针对“中原之星”电动车组的特点和技术要求,信息显示系统采用了全新的数据交换方式和显示模式。文中对此作了介绍,包括数据交换的方式与原理、显示内容的组织以及故障数据的处理、记录等。运用情况表明,显示系统功能完善,达到了预期效果。     

轻型双柱墩桥振动试验研究

结合轻型墩横向刚度合理值研究 ,对某典型的轻型双柱墩桥进行全面综合的动力试验 ,分析研究该桥的动力特性、墩梁体系横向振动、支座对桥梁横向振动的影响及列车通过该桥的抗脱轨安全性 ;综合评估轻型双柱墩桥的横向动力性能。     

综合布线系统及其应用

本文结合海润国际住宅综合布线工程阐述了综合布线系统的组成及应用,介绍了综合布线铜缆系统的现状及发展方向。     

分数阶系统极点分布与时间响应

与传统线性定常控制系统相比,分数阶线性定常系统极点分布与时间响应关系有所不同.本文通过分析多值函数特性在黎曼平面中的表达以及s-平面与w-平面的映射关系,给出了分数阶线性定常系统极点分布与时域响应的定性关系.对位于第二黎曼平面的极点更加远离s-平面的右半平面给出了形象化解释,并称其对应的时间响应为“超阻尼”响应.最后介绍了一种分数阶线性定常系统的稳定性判据.     

轻型材料在电力机车车体开发中的应用

介绍了轻型材料的主要特点及其在车体轻量化设计中的作用,着重论述轻型材料在电力机车车体开发中的应用。     

PC轨道梁制造的线性控制技术

跨座式单轨交通系统的PC轨道梁既是承载梁又是列车运行的轨道，重点阐述在PC轨道梁施工中，从底模台车、侧模、端模等的拼装方面控制PC轨道梁线性的施工技术。     

Simulation of the mean zero-up-crossing wave period using artificial neural networks trained with a simulated annealing algorithm

The aim of this work was to develop a predictive model to forecast the mean zero-up-crossing wave periods (T _z ) for 3-hourly sea states at a location in the Pacific using artificial neural networks (ANNs). Seven multilayer ANNs were trained with a simulated annealing algorithm. The output of each trained ANN was used to estimate each of the seven parameters of a new distribution called the hepta-parameter spline proposed for the conditional distribution of T _z , given some mean zero-up-crossing wave periods and significant wave heights. After estimating the parameters of the distribution, the model was used to simulate and predict future values of T _z . Forecasting a sea state and developing the joint distribution of sea state characteristics with the help of the simulated characteristics are also discussed in this article.     

基于人均产值比的成都市物流需求分析

在阐述物流需求与人均国民生产总值关系的基础上,运用"人均产值比"法,对影响成都市农产品、工业品和居民消费品物流需求的主要因素进行分析,从而得出成都市物流需求基本特征,可为物流发展及规划提供参考。     

Cooperation in transit delivery in West German metropolitan areas

West Germany is densely populated, averaging 245 inhabitants/km², but varying widely between urban agglomerations and rural areas. Transport volume has increased by 40% since 1970, with virtually all growth due to private automobiles. Since 1981 public transit has been suffering from decreasing demand.A 1964 Expert's Report to the German federal government was the stimulus for initiating an effective funding mechanism for new public transit construction. In 1965 Germany's first federated transit authority was founded for the region of Hamburg.Principal among the goals of any cooperative agreement among transit companies are improvements for the passengers and improvement of revenues for the companies. To attain these ends, two distinct forms of transit aggrements have been developed in Germany: transit cooperative (Verkehrsgemeinschaft) and transit federation (Verkehrsverbund). The former is more suitable for smaller to medium-sized towns, while the latter is more suitable for larger cities. The two types are described in this article.German transit federations during the 1970s succeeded in significantly increasing ridership, while during the 1980s patronage has either remained steady or has declined. Yet transit federations showed much better perfomance than did public transit in general. In terms of costs and revenues, no public transit organization in Germany is able to break even; deficits vary between 42% and 55%. The author concludes, however, that hidden subsidies for automobile traffic are far higher, because of environmental damage and the high social cost of traffic accidents.     

轻轨车辆车体承载结构材料的选用

本文通过对车体承载结构用的耐候钢、不锈钢及铝合金等材料的有关性能和经济性进行分析比较,指出在经济条件和生产许可的情况下,以采用铝合金作为轻轨车辆车体承载结构材料为宜.