The equity impacts of bus rapid transit: A review of the evidence and implications for sustainable transport

The paper offers an analysis of empirical evidence on the equity impacts of operational Bus Rapid Transit (BRT) systems in the Global South. The focus is on vertical equity, i.e. whether BRT systems achieve progressive benefits for poorer segments of the population. Findings from Africa, Asia, and Latin America all suggest that BRT does offer significant benefits to low-income groups, in terms of travel time and cost savings, access enhancement, and safety and health benefits. However benefits are often skewed toward medium-income users and thus less progressive than they might be. Two primary reasons for this are insufficient spatial coverage and inappropriate fare policies. While many features of BRT potentially allow it to deliver pro-poor outcomes, such outcomes only materialize if BRT implementers pay specific and sustained attention to equity. The paper identifies key issues that need to be addressed to steer BRT implementation toward more socially sustainable outcomes—including better integration with other transit, paratransit, and nonmotorized transport services, and with the housing sector.     

基于快速成型的产品创新知识供应链研究

知识是技术的源泉,知识供应链是技术创新中知识供应的有效通道。应用知识供应链开发新产品包括强化知识供应链,加速知识流动转化和反馈知识应用绩效,以及保持知识循环等方面。快速成型技术在产品创新知识供应链中,加快了知识流动,促进了隐性知识显性化,反馈了知识创新的作用绩效,加速了知识螺旋循环,有效地支持了产品创新。     

巷道快速掘进技术在贵州省煤与瓦斯突出煤层中的探讨与应用

巷道快速掘进技术是一项系统工程。为了实现矿井高产高效,必须以巷道快速掘进技术为前提和保障。本文以贵州省为例,探讨了巷道快速掘进技术的研究现状及影响因素。针对贵州某矿突出综合检测指标经常超限、掘进速度慢等问题,采用了高压水射流割缝与瓦斯抽放边抽边掘相结合技术。研究表明:该项技术能有效削弱煤层突出危险性,大幅度提高瓦斯抽放量且巷道掘进速度提高了2~3倍。同时根据贵州省的本土情况,提出了针对性地建议和措施,能为巷道快速掘进技术的推广与应用提供一定的指导。     

Who could benefit from a bus rapid transit system in cities from developing countries? A case study from Kampala,Uganda

The present rapid urban growth of cities from developing countries causes negative externalities such as lagging infrastructure development. In combination with rapidly rising motorized vehicle use this leads to severe traffic congestion affecting the mobility of the urban residents. Therefore many urban governments are planning to improve their transport and mobility situations with mass rapid transit systems of which a bus rapid transit (BRT) is a rather easy system to implement at reasonable costs. However, due to high urban inequalities the effects of urban traffic and potential improvements of the urban transport system for the diverse group of urban residents can differ significantly. In our case study Kampala (Uganda) four main groups were identified through cluster analysis of socio-economic and residential data gathered through interviews: extreme poor, poor, middle income and rich. Each group experiences a different mobility with the extreme poor being the most vulnerable group. The planned BRT system aims to decrease the average travel time but risks to exclude the lowest income class since not enough attention is paid to the affordability of the system to all residents. Therefore we argue for a policy that works from bottom up and pays attention to the internal diversity of the population.     

Optimal transit fare and service frequency of a nonlinear origin-destination based fare structure

This paper proposes a new nonlinear distance-based transit fare structure, which is measured by a function of the Euclidean distance between the origin and destination stations, termed as Origin-Destination (OD)-based fare. The novel fare structure encourages passengers to freely choose the most efficient trip plan. An optimization model is formulated based on a three-party game (involving the transport authority, transit company, and passenger) to determine the optimal fare function and frequency. An artificial bee colony algorithm is adopted to solve the model. Finally, a numerical example is provided to verify the proposed method.     

市域轨道交通线路合理经济长度研究

在理论分析的基础上,从经济角度出发研究市域轨道交通合理的经济长度。以乘客旅行次数需求密度函数为基础,建立市域轨道交通线路长度效益函数和成本函数,其中效益函数包括旅客时间节省效益函数和票价收入效益函数;成本函数包括建设成本函数和运营成本函数,效益函数和成本函数相加即为市域轨道交通社会效益最大化的目标函数。通过建立社会效益函数的非线性函数,建立模型求解,得出合理的市域轨道交通经济长度。     

城市轨道交通相邻多车站动态协同限流研究

为应对城市轨道交通车站高峰期客流压力,限流已经成为常态应对措施,而经常采用的限流策略大多针对单个车站,缺少对相邻多个车站的协同考虑。基于客流在车站间的传播效应,以乘客总延误时间最小为目标,以站台及列车能力为约束条件,构建城市轨道交通相邻多车站协同限流决策模型,同时为实现实时动态控制,引入滚动时域控制方法,优化多车站动态协同限流流程。以北京地铁8号线为例,经过相邻若干车站运营数据进行限流策略计算。结果表明,该模型限流可以在不造成车站服务人数损失的同时,将乘客总延误时间降低21%。     

轨道交通对房价影响的范围及时间性研究——基于重庆轨道交通二号线的实证分析

基于重庆轨道交通二号线的实证分析,研究了其对周围房价的影响范围,结果表明其对大渡口区域的影响范围最大为2.5km,同时研究了轨道交通二号线对房价影响的时间性,发现轨道交通线路全面开工和全线竣工通车两个时点均是影响房价幅度的峰值点.     

高速数字信号处理采集数据的存贮

本文针对高速数字信号处理技术中存在的数据接口问题,分析了几种数据存贮结构,在此基础上给出了一种性能/价格比较优的总线隔离的数据存贮器直接存贮数据接口结构。     

传统立体印刷材料系统的开发工艺

如果缺少对立体印刷（3DP）技术的研究经验将难以开发一种新型的应用于此领域的材料系统,因为立体印刷的灵活性要求其具有大量材料参数和工艺参数。本文详细介绍了开发立体印刷工艺的各个实施步骤,以及各个步骤中使用到的工具和注意事项。该材料系统的开发流程可以加深对立体印刷工艺的理解,帮助用户充分利用立体印刷的相对灵活性,加速新材料系统的发展。同时,本文以应用立体印刷材料系统开发高致密陶瓷牙制品为例,介绍立体印刷的灵活性。