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71.
Autonomous vehicles (AVs) potentially increase vehicle travel by reducing travel and parking costs and by providing improved mobility to those who are too young to drive or older people. The increase in vehicle travel could be generated by both trip diversion from other modes and entirely new trips. Existing studies however tend to overlook AVs’ impacts on entirely new trips. There is a need to develop a methodology for estimating possible impacts of AVs on entirely new trips across all age groups. This paper explores the impacts of AVs on car trips using a case study of Victoria, Australia. A new methodology for estimating entirely new trips associated with AVs is proposed by measuring gaps in travel need at different life stages. Results show that AVs would increase daily trips by 4.14% on average. The 76+ age group would have the largest increase of 18.5%, followed by the 18–24 age group and the 12–17 age group with 14.6 and 11.1% respectively. If car occupancy remains constant in AV scenarios, entirely new trips and trip diversions from public transport and active modes would lead to a 7.31% increase in car trips. However increases in car travel are substantially magnified by reduced car occupancy rates, a trend evidenced throughout the world. Car occupancy would need to increase by at least 5.3–7.3% to keep car trips unchanged in AV scenarios. 相似文献
72.
Transfer points between metro and bus services remain an elusive, yet critical junction for transportation practitioners. Based on massive Smart Card (SC) data, previous studies apply a one-size-fits-all criterion to discriminate between transfers. However, this is not sufficiently convincing for different transfer pairs. To counter this problem, this study applies an association rules algorithm and cluster analysis to recognize metro-to-bus transfers using SC data, and demonstrates transfer recognition in a case study based on SC data collected during a week in Nanjing, China. It is shown that 85% of the transfer-recognition results are quite stable through the whole week, and the median transfer time between metro and bus is below 20?min. The method proposed in this study can be used to identify the busiest transfer points and to obtain average transfer times, which facilitates a smarter and more efficient public transit network. 相似文献
73.
提高和改善大型集装箱船舶装载能力的探讨 总被引:1,自引:1,他引:0
充分掌握大型集装箱船在满足船舶规范规定的适航、适货条件(船舶吃水、稳性、强度、系固、安全航行及适货要求),结合国际及国内有关法规及港口有关规定,提高和改善其装载能力,发挥更大经济效益是值得深入探讨的。 相似文献
74.
用模拟和数字两种方法增强图象,以突出病灶,然后运用新颖的区域生长法识别、测量单个尘肺小阴影,通过统计运算进行尘肺病的诊断和分期。此种辅助诊断方法,提供信息直观可靠。30例X线胸片密集度测定结果,与矽肺病期级别相一致。 相似文献
75.
在分析研究集团电话计费管理系统的实时监控子系统中的数据采集与数据管理之间的接口问题的基础上发现常用的实现方法及其不足之处,随后提出直接将数据存入数据库和使用动态链接库的方法,并对它们的实现作了简要的介绍。 相似文献
76.
The past quarter of a century has brought with it significant change in the field of port management, both in terms of the goals that are set and the tools used. This trend has resulted in increased pressure on port authorities. The purpose of this paper is to deal in greater detail with developments in this area of port economics. 相似文献
77.
A. D. De Pater 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1982,11(3):121-141
Paper deals with the linear behaviour of a railway vehicle with any arbitrary number of wheelsets, body parts and connecting elements. A vehicle which has both perfect curving properties and asymptotical stability at vanishing speed, has to satisfy a twofold condition, indicated by Wickens in 1978. In the present paper this condition is derived in reliance upon the dimension theorem for linear mappings. How the investigation can be executed in practice, is shown for the case of a two-axled vehicle. At last the behaviour in a transition curve is discussed. 相似文献
78.
对桩周土弹性模量确定方法的探讨 总被引:5,自引:0,他引:5
综合分析了目前确定桩基础上弹性模量的3种方法:室内试验方法、基于过去工程实践的经验关系的方法及由单桩的荷载试验曲线反算的方法,提出了一种利用单桩荷载-沉降曲线确定土弹性模量的简单方法,并给出了计算公式和图表供工程实际应用。通过实例分析表明,弹性理论法计算桩基础沉降时,应该用单桩荷载试验曲线反算方法得到的土弹性模量作为计算参数。 相似文献
79.
Transportation - Assessing jobs-housing balance (JHB) and commuting efficiency is crucial to urban and transport planning. However, the scale dependency problem, meaning that metrics may be biased... 相似文献
80.