Jointly optimizing cost, service, and environmental performance in demand-responsive transit scheduling

In certain fleet systems, the environmental impacts of operation are, to some extent, a controllable function of vehicle routing and scheduling decisions. However, little prior work has considered environmental impacts in fleet vehicle routing and scheduling optimization, in particular, where the impacts were assessed systematically utilizing life-cycle impact assessment methodologies such as those described by the Society of Environmental Chemistry and Toxicology. Here a methodology is presented for the joint optimization of cost, service, and life-cycle environmental consequences in vehicle routing and scheduling, which we develop for a demand-responsive (paratransit or dial-a-ride) transit system. We demonstrate through simulation that, as a result of our methodology, it is possible to reduce environmental impacts substantially, while increasing operating costs and service delays only slightly.     

基于阿特金森循环的电动汽车增程器开发

增程式车用发动机更加关注电驱动车辆行驶工况下,电机驱动功率-道路行驶阻力功率平衡状态时的发动机燃油经济性.基于这种特点,开发了一种增程式电动车辆专用发动机,发动机工作循环采用基于阿特金森循环的高膨胀比设计,发动机可以提供额定35 kW的发电功率输出.匹配车辆后,对比同等动力水平下的传统奥托循环发动机与阿特金森循环增程器...     

铅酸蓄电池的经济寿命

本文介绍挖掘铅酸蓄电池寿命潜力的工作。放出总容量与放电深度关系为挖掘铅酸蓄电池寿命潜力指明了方向并提供了参考数据。提出了经济放电深度和经济寿命的概念。经济放电深度约40%;经济寿命约2000次;放出最大总容量约800C。     

辽宁省沟域旅游发展的瓶颈问题及解决对策

通过对沟域、沟域经济的概念介绍,引出沟域旅游的概念。通过介绍近年来辽宁省沟域旅游发展的概况,归纳整理出辽宁省发展沟域旅游过程中遇到的瓶颈,并根据这些瓶颈问题有针对性地提出解决对策。笔者从资金投入、融资渠道、土地利用、科学规划、人才培养、标准化服务等方面,提出了切实可行的措施和方法。     

我国高职院校国际交流与合作发展探析

文章分析了高职院校国际交流与合作的内涵及意义,指出了目前高职院校国际交流与合作所面临的问题．从政府和高职院校两个方面提出促进我国高职院校国际交流与合作发展的建议。     

考虑交叉口影响的城市路网信号优化设计问题研究

基于城市路网交通间断流特性,本文将微观层面的信号交叉口延误计算方法引入宏观层面的平衡网络信号优化设计问题,构建了一个中观层面的城市路网交叉口信号优化设计双层规划模型,设计了基于遗传操作的优化算法。通过路网算例对模型及算法进行测试,并通过与微观、宏观层面的两种信号优化配时方法进行比较,验证所提出模型的优越性。     

基于VISSIM仿真的平面交叉口信号配时方案比选分析

信号交叉口是城市路网的节点和交通关键,它的配时方法对缓解交通拥挤起到决定作用。首先介绍国内外信号配时模型,在对哈尔滨实际交叉El交通调查的基础上,运用4种模型进行配时方案设计,应用VISSIM软件进行仿真分析,得出美国HCM配时方法是最优配时模型。     

基于理解设计的后张法施工控制要点

详细分析后张法预应力构件设计思路,根据设计思路及施工中易出现的问题提出施工控制要点,并根据施工控制要点提出先进的施工工艺,保证施工效果达到设计目标,为后张法预应力构件使用的安全性以及延长构件使用寿命提供保障。     

非连通图C3（m，0，0）∪G的优美性

讨论了非连通图C3（m,0,0）∪G的优美性,给出了非连通图C3（m,0,0）∪G的两种优美标号,其中,C3（m,0,0）表示圈C3的（m,0,0）-冠,图G是满足一定条件的平衡图。     

Impact assessment of the Internet of Things on feeder transit performance

ABSTRACT

Efficient planning for demand responsive transit (DRT) can contribute to fulfilling the first/last mile transport needs for users of a major transit line. With the advancement in communication technologies, the internet is expected to assist this growing need of providing first/last mile connectivity. This is proposed to be achieved through a network created by Internet of Things (IoT). This paper evaluates the effect of implementation of IoT on service quality (or disutility) of DRT for two scenarios – with enabled-IoT (e-IoT) and with disabled-IoT (d-IoT). Data from five different DRT-like systems known as Call-n-Ride (CnR) routes operating in Denver, Colorado, are used for evaluation purposes. These CnR routes are Meridian, Interlocken, South Inverness, Broomfield and Louisville. Results show that, in general, all CnR routes would experience more than a 58 percent decrease in disutility if their operations were based on ‘with e-IoT’ operations. Interlocken would record the largest percentage decrease (74 percent) in disutility if its route service switched from the ‘with d-IoT’ to the ‘with e-IoT’ scenario.