Economies of density and factor substitution in Dublin city bus services — a translog approach

The primary aim of the paper is to determine a short‐run cost function for Dublin City Bus Services (DCS), using a translog approach. The results show that there are significant economies of density in the transit operation. The results also indicate that the structure of DCS is characterised by a homothetic production function and that partial elasticities of substitution are non‐unitary.     

Statistical modeling of Electric Vehicle electricity consumption in the Victorian EV Trial,Australia

The market share of Electric Vehicles (EVs), an attractive alternative to conventional vehicles, is expected to exceed 30% of all vehicles by 2033 in Australia. Although the expected EV uptake may place greater burdens on electricity networks, the potential impacts contributed by different EV user categories and vehicle models to peak loads at different times during the day are not well understood. This paper addresses the issue through statistical analysis of the charge events in the Victorian EV Trial in Australia as well as modeling the charging behaviors according to participant categories and vehicle models. The analysis was performed on 4933 charge events that were recorded by both private and public Electric Vehicle Supply Equipment. In total, these events consumed over 33 MW h of energy over 12,170 h by the 178 trial participants, out of which about 70% were household participants while the others were fleet participants. Based on a range of EV uptake scenarios and modeled charging behaviors from the trial, the power demand in the summer of 2032/33 was estimated for all of Victoria. The results of the simulations show that the broad scale uptake of EVs produces a relatively small increase in overall power demand (estimated to be between 5.72% and 9.79% in 2032/33).     

Economic conditions for minibus usage in a multimodal feeder network

The introduction of minibuses into the transit fleets of some cities makes it more important than ever to investigate the economic and operating conditions of these vehicles for various transit and paratransit services. A high performance transit system is of great interest, owing to its desirable characteristics. However, it is not feasible to establish and use such a system all over a city. It is therefore necessary to support a high performance transit system with other modes to extend its area of operation (owing to higher demand) and also to connect those areas that are not covered by the high performance system to it. This paper considers the use of minibuses in the design of metro line feeders and to characterize the economic domain in which it is efficient to use them in a feeder network. Based on results from ant colony optimization, the performance measures of minibuses are compared with those of conventional buses to help make decision makers aware of the use and role of these vehicles. The study contradicts the common belief that, since minibuses require similar driver costs to those of conventional buses, it is not economical to use them in a transit fleet; in fact, it is shown that minibuses can displace conventional buses in some situations in a feeder network.     

‘Gasen-do FE’ statement of methods

Gasen-do FE is a simulation software for pantograph/catenary dynamic interaction analysis. Gasen-do FE is based on the non-linear finite element method, and its code is implemented in Matlab. This program corresponds to 2D and 3D models of simple and compound catenaries. Steady arms and catenary suspension equipments such as droppers and hangers are modelled as bar elements taking into consideration the tangential stiffness due to their geometrical non-linearity. It is possible to simulate the effect of slackening of droppers and hangers. This paper will introduce the computational algorithm of this program and the validation result by comparing with experimental data.     

基于复式收费系统双收费亭联动控制的研究

在以往高速公路收费站采用增加车辆分配器或者人工复式解决联动控制外设的研究应用基础上,针对国内目前一些高速公路采用的单车复式收费,提出单车道上复式收费中多个收费亭的联动处理解决方案,目的在于改善与解决同一车道上多个收费亭之间不能联动控制外设,导致收费站人员投入多、收费速度慢、逃费现象等问题。从软件角度,根据计算机数据结构中队列的概念,在复式车道中增加收费亭间通信功能,使同一收费车道上的多个收费亭能共享车道内通过车辆的信息,减少由于人工操作带来的不利影响。同时在不增加外设的情况下,对收费车道软件系统做相应的改造,解决了复式收费中联动控制外设的问题。     

不同公路占地类型的土壤质量研究

对吉林省营城子至松江河高速公路沿线3种典型公路占地类型(林地、旱地、水田)0～10、10～20、20～40cm的剖面土壤营养状况进行了比较分析,运用土壤质量综合指数研究了土壤质量水平.结果表明:不同公路占地类型的剖面土壤养分含量存在很大差异;3种不同公路占地类型0～10 cm土壤质量表现为水田＞旱地＞林地,10～20c...     

浅谈档案有效利用在服务交通事业发展中的作用

阐述了科学管理是档案工作服务交通事业的前提,信息收集贮备是服务交通事业的基础,有效利用档案在交通事业发展中起着重要的作用。     

舰船摇荡运动数据采集及混沌特性分析

针对波浪中的舰船摇荡运动难以用微分方程进行描述的矛盾,提出了通过实船试验获取摇荡时历进而分析其机理的方法.详细介绍了舰船摇荡运动数据采集的设备、方法和步骤.对实测数据进行的定性分析和定量计算表明,所采集的实船摇荡时历是混沌时间序列,表明实际非规则波中的舰船摇荡运动具有混沌特性.     

路面铣刨机对戈壁地表砂土收集能力试验研究

通过利用路面铣刨机对砂石料和细砂料进行切削收集试验,研究了市场现有的路面铣刨机产品对戈壁砂土的收集能力。试验表明：将铣刨方法用于戈壁污染砂土收集在技术上是可行的,但为了避免砂土污染物向切削层以下土壤交叉和扩散,应减少砂土刨削收集量,提高其铣削的收集能力,并对现有的路面铣刨机产品进行适当改造。     

贵阳市南明河截污沟新添寨片区污水收集管网工程设计

介绍贵阳市南明河新添寨片区截污干管及河道治理设计的构思,从工程实际出发,对城市排污管网工程及配套河道治理工程的设计要点进行了阐述和分析,有关经验可供相关专业人员参考。