Impact of pricing and transit disruptions on bikeshare ridership and revenue

Transportation - Bikeshare operators routinely explore options to improve ridership and revenue by studying interaction among pricing, service and operations. The objective of this research is to...     

High-Speed Rail Operations on an Existing Network: An Assessment Model for China

High-speed rail operations have the potential to reduce the long-term decline in rail passenger travel demand for the medium to long distance inter-urban markets. Such decline has been evident through most of the industrialized countries where air and road transport tend to be the dominant modes. In China, the operations of long distance high-speed rail on fully dedicated track is not very easy to implement, due to the high proportion of passengers who travel between high-speed and conventional railways. An alternative approach would be to allow for mixed operations with trains of various speeds on the same track. This article puts forward a simulation model designed to allow an evaluation of the most efficient distance for high-speed rail operations under mixed train speed scenarios. The model takes into account the main operating parameters such as passenger volumes, train speeds, capital and maintenance costs, train operating costs and energy consumption. The distance of high-speed train running on conventional rail that will yield the most economic benefit can be estimated using the model. The article includes the results of using the model for a specific example. It is concluded that large-scale high-speed trains have the potential to be successfully operated on conventional rail networks.     

某地铁站运营过渡期区间隧道通风方案分析

某地铁站运营过渡期间,通过对区间隧道通风方案及区间事故工况模拟计算,对比第三方检测单位现场实测区间事故工况下的最小风速,可以得出车站1-车站2区间事故工况下,最小实测风速出现在车站3轨行区位置,与模拟计算位置基本一致,为以后地铁线路设计提供参考。     

Analysis of Metro ridership at station level and station-to-station level in Nanjing: an approach based on direct demand models

A growing base of research adopts direct demand models to reveal associations between transit ridership and influence factors in recent years. This study is designed to investigate the factors affecting rail transit ridership at both station level and station-to-station level by adopting multiple regression model and multiplicative model respectively, specifically using an implemented Metro system in Nanjing, China, where Metro implementation is on the rise. Independent variables include factors measuring land-use mix, intermodal connection, station context, and travel impedance. Multiple regression model proves 11 variables are significantly associated with Metro ridership at station level: population, employment, business/office floor area, CBD dummy variable, number of major educational sites, entertainment venues and shopping centers, road length, feeder bus lines, bicycle park-and-ride (P&R) spaces, and transfer dummy variable. Results from multiplicative model indicate that factors influencing Metro station ridership may also influence Metro station-to-station ridership, varied by both trip ends (origin/destination) and time of day. In comparison with previous case studies, CBD dummy variable and bicycle P&R are statistically significant to explain Metro ridership in Nanjing. In addition, Metro travel impedance variables have significant influence on station-to-station ridership, representing the basic time-decay relationship in travel distribution. Potential implications of the model results include estimating Metro ridership at station level and station-to-station level by considering the significant variables, recognizing the necessity to establish a cooperative multi-modal transit system, and identifying opportunities for transit-oriented development.     

快速密封装置在密封测试中的应用

本论文介绍了一种管件快速密封接头采用机械封堵方式对非标准的特殊管件进行密封。     

荣威750混合动力系统开发

讨论荣威750混合动力汽车通过优化利用混合动力系统硬件(电机、电池、发动机和自动变速器等)和控制方法,以及提升整车零部件性能(如使用低阻轮胎,整车减重等)来提升燃油经济性,并总结了动力总成控制系统的开发。     

基于3D打印技术的两轴变速器教具开发

基于3D打印技术的灵活性、方便性等优点,3D打印技术在许多领域得到广泛的应用;因此引来诸多关注,并在自制教具模型方面得到推广。目前汽车变速器空间结构复杂、难以拆卸,所以在教学中存在抽象、枯燥等现象。为了提高"教、学、做"一体化教学效果,利用3D打印技术打印变速器教具模型,满足汽车专业教学需求。同时提高了学生的实践技能、还为教学节约了成本,还提高了课堂的趣味性及效率。     

小型水下航行体动力系统测试技术应用研究

本文结合小型水下航行体动力电池组和推进电机组测试的要求,对小型水下航行体电动力系统的测试技术进行了探讨.通过对电动力系统测试的技术,进而发展至与其他各系统仿真设备间的有机融合,实现在陆上进行小型水下航行体全产品测试,进而对故障的准确诊断,保证产品试验验证的充分性和有效性.     

浅谈隧道施工中的环境保护

通过工程实例,介绍了在长大隧道施工过程中如何对水环境污染、大气污染、隧道内空气污染、固体废弃物处理、植被保护、防止水土流失、保护土地资源等环境进行保护的措施。