海上导航浮标的远程监测

介绍新近研发的海上导航浮标(以下简称航标)信息的远程监测系统的软硬件设计整体方案。海上航标与陆上控制中心之间的信息交换以GSM方式实现。本系统可以监测航标的经纬度、电气参数和日光阀，判断航标是否被撞等。另外，控制中心也可以设置航标闪烁频率、航标灯的开或关及GSM工作方式等。整个系统经海上现场调试运行，证明是可行的。     

轨道式水泥混凝土摊铺机的使用

通过对轨道式水泥混凝土摊铺机的使用,找到了一些正确的使用方法,给出了影响平整度的因素及注意的问题,以及水泥混凝土本身对摊铺质量的影响,同时给出了提高摊铺质量的方法.     

Modeling a rail transit alignment considering different objectives

An optimization model for station locations for an on-ground rail transit line is developed using different objective functions of demand and cost as both influence the planning of a rail transit alignment. A microscopic analysis is performed to develop a rail transit alignment in a given corridor considering a many-to-one travel demand pattern. A variable demand case is considered as it replicates a realistic scenario for planning a rail transit line. A Genetic Algorithm (GA) based on a Geographical Information System (GIS) database is developed to optimize the station locations for a rail transit alignment. The first objective is to minimize the total system cost per person, which is a function of user cost, operator cost, and location cost. The second objective is to maximize the ridership or the service coverage of the rail transit alignment. The user cost per person is minimized separately as the third objective because the user cost is one of the most important decision-making factors for planning a transit system from the users’ perspective. A transit planner can make an informed decision between various alternatives based on the results obtained using different objective functions. The model is applied in a case study in the Washington, DC area. The optimal locations and sequence of stations obtained using the three objective functions are presented and a comparative study between the results obtained is shown in the paper. In future works we will develop a combinatorial optimization problem using the aforementioned objectives for the rail transit alignment planning and design problem.     

Evaluating web site service quality in public transport: Evidence from Taiwan High Speed Rail

More and more public transport system passengers plan their trips by using website services. The passengers’ perceived service quality of a website plays a crucial role in recognizing the satisfaction of a transportation service chain. This study aims to investigate the passengers’ perception of electronic service quality (e-SQ) delivery through the Taiwan High Speed Rail’s (THSR) website, by adopting the Rasch measurement model to measure a subjective latent construct: perceived e-SQ. The Rasch model can compare person parameters with item parameters, which are then subjected to a logarithmic transformation along a logit scale to clearly identify which e-SQ measurement items are appreciated by certain passengers. Analytical results show substantial differences between the perceived e-SQ of various personal characteristics such as age, income, and trip types. Empirical results also demonstrate that passengers are most satisfied with the website’s accuracy of information and introduction to the THSR stations’ surrounding area, but are not satisfied with instructions when a transaction fails as well as the carriage layout of the THSR. Our analytical results also identify which service items lead to the perceived e-SQ difference between business trip and leisure trip passengers. The relationship between the two main attribute dimensions – quality of transportation information provided and quality of website services – are also further examined. The empirical results can help a transportation system service operator to better understand how passengers perceive e-SQ and to suggest what should be improved.     

引导新城发展的轨道交通分层分级策略研究

新城建设是目前许多大城市缓解城市问题的主要手段之一,轨道交通在引导新城发展中发挥了重要作用.本文通过对轨道交通"点"、"线"、"面"三层的等级结构进行分析,着重分析了轨道交通点层枢纽、线层走廊对新城的引导策略,指出轨道交通在引导新城点层开发、轴向扩展方面的重要作用.     

深圳市轨道交通二期线网票价研究

为制定深圳市轨道交通线网票价方案,首先分析了现行票价所存在的问题。通过分析轨道交通票价制定的相关影响因素,提出了深圳市轨道交通票价制定原则。同时,借鉴国内外典型城市轨道交通票制票价经验,结合深圳市轨道交通发展现状,提出了轨道交通票制宜采用里程分段计价,确定了合理的票价方案。最后,对深圳市轨道交通线网票价提出了几点建议。     

灰色GM(0,N)法在轨道交通噪声预测中的应用

以实测样本数据为基础,根据灰色系统理论对列车车速、距轨道中心的距离两个因素进行灰色关联度分析,发现前者对线路侧方噪声级的影响要强于后者;分别建立线性回归模型和GM(0,N)模型,将预测值和实测值进行比较,发现灰色GM(0,N)模型的预测方法性能良好,是一种优秀的噪声预测方法.研究成果对轨道交通噪声影响因素的主次识别、降...     

台湾高速公路服务区规划设计介绍

高速公路服务区是高速公路工程的重要组成部分之一,它既是为高速公路运营提供各项服务的交通设施,又是在高速公路上开设的内部出入口,对高速公路的行车功能有一定的影响作用.在分析台湾高速公路服务区布局与建设特点的基础上,结合重庆高速公路服务区存在的问题,提出规划设计思路,供同行交流和研讨.     

抗浮锚杆在U型槽中的应用

宁远道口下穿立交设计中,地下水位高,道路U型槽设计中,岩层较浅的条件下,利用抗浮锚杆起到抵抗地下水浮力的作用,通过理论计算和现场试验来确定锚杆的入岩深度,已达到经济、便捷、安全的效果。     

轨道交通装备制造业发展趋势分析

在对"十一五"期间轨道交通装备制造业调研基础上,研究并构建由约束性和评价性两大类发展指标构成的轨道交通装备制造业发展指标体系,结合2006-2009年我国轨道交通装备制造业主要发展指标的实证研究与统计分析,对装备制造业发展趋势进行预测,为合理制定"十二五"期间轨道交通装备发展规划提供量化的科学依据.研究结果表明,随着轨道交通大规模建设的展开和相继投入运营,轨道交通装备制造业的主要经济效益快速增长,节能降耗取得明显成效,科技创新能力大幅度提高;"十二五"期间轨道交通装备将继续呈现大幅增长,动车组、大功率机车、货车的新造需求量与保有量相比将分别有60%,40%,30%以上的增长,城轨车辆的新造需求量与保有最相比将有90%以上的增长.