Effect of capacity concentration on highway corridor performance

This paper investigates, through use of analytical models, the effects of capacity concentration on highway corridor performance. It concludes that when highways operate at a fixed total capacity, decreasing the highway spacing can increase the average travel time because highways will become more congested. When highways operate below capacity, decreasing the spacing is usually beneficial as it tends to reduce trip length when accessing highways, and allows a greater percentage of travel to be completed on highways instead of arterials.     

Subsidy and public transit performance: A factor analytic approach

The need to measure and evaluate transit system performance has led to the development of numerous performance indicators. However, depending upon the indicator, we oftentimes reach different conclusions regarding transit system performance. The research reported in this paper uses factor analytic methods to generate a set of underlying attributes (factors) that capture the performance of public transit systems in Indiana. Similar to what is reported in the literature, this study finds three attributes that best describe transit system performance: efficiency, effectiveness, and overall performance. Based upon systemsÕ factor scores, the study finds that systems scoring highly on one attribute generally perform well on the remaining attributes. Further, there is an inverse relationship between system performance and subsidies, a finding that supports performance based subsidy allocations.     

客运专线先张法预应力混凝土箱梁制梁台座的设计

客运专线先张法预应力混凝土箱梁的制梁台座是大吨位先张法制梁工艺的关键设备，需要承受高达51000kN的巨大张拉力。提供了制梁台座的实用设计，为大吨位先张梁的制造提供了必要的技术支持。     

浅析空气式尾轴密封

介绍了常规油润滑唇形尾轴密封的主要缺点，空气式尾轴密封的原理、主要形式及目前常见的AIRGUARD3AS空气式尾轴密封。     

Windows CE流接口驱动程序设计方法

开发嵌入式操作系统的设备驱动程序是应用嵌入式技术的重要基础。流接口驱动程序是Windows CE基本的驱动程序，是很多驱动程序的基础。分析Windows CE流接口驱动程序的基本结构，探讨流接口驱动程序的功能定义，认为流接口驱动程序应当能为应用程序提供查询输入和事件输入等两种输入方式，给出中断程序设计、I/O缓冲区设计的注意事项，总结一般的流接口驱动程序设计开发方法。     

高强高性能混凝土配合比设计技术研究

为了满足某工程中采用的高强高性能混凝土在施工中的要求,通过掺入水泥含量5%的抑制剂,来抑制混凝土的碱骨料反应;掺入70 kg/m3的粉煤灰,增强了混凝土的和易性和可泵性,降低了混凝土的水化热,提高了混凝土的耐久性,同时粉煤灰的掺入对碱骨料反应也有一定的抑制作用,给出了该高强高性能混凝土配合比材料用量,分析了该配合比的特点和混凝土在搅拌过程中的质量控制标准。该项研究对类似工程情况具有借鉴作用。     

完善新《技规》有关工务个别条文的建议

第九版<铁路技术管理规程>(下称"技规")实施快一年了.我们在学习过程中,体会到个别条文,在保证安全、可操作性、创新意识上尚有不足之处,建议进一步完善.     

回转翼型液压舵机检修工艺

文章就大型回转翼型舵机的维修,叙述故障原因,找出解决的方法,完成对磨损面的修补和对密封导套的更换。并利用工厂现有能力对密封导套和定转子进行安装。期间提出一些特殊的工艺方法,可供同行借鉴。     

基于灰理论的港口吞吐量预测研究

港口吞吐量是港口建设的重要依据,有效预测港口吞吐量,才能使港口在海洋运输业中发挥重要作用。灰理论预测可以在少量信息、不完全数据的情况下,揭示港口吞吐量的发展变化特征,是研究港口吞吐量的有效工具。本文对上海港货物吞吐量进行研究的结果表明,应用灰理论对港口吞吐量建立灰色模型GM(1,1)进行短期预测,其结果有较高的实用价值。