首批CNG“敢为天下先”——重庆市交通运输委员会经验

重庆市交通委员会的重庆市绿色低碳交通运输城市区域性项目,在2013年申请到交通运输部和财政部资金共计2580万元。     

灌注桩的施工工艺的要点

灌注桩是桥梁施工中常见的一种施工工艺,根据不同地形、地质叙述两种灌注桩的开挖方式及灌桩时导管堵塞现象的常见原因、处理方法,和灌注桩施工时需注意的事项。     

大写的宁夏 苍凉的壮美

<正>这片地域,悠远、苍凉,堆满帝王的鲜血和漫天的黄沙。这是一片孤烟如钩扑朔迷离的地域。这里更多地充满马背上的较量,蹄印如雨之下其实是另一种江南,它叫做宁夏。正因为承载了3000年边塞黄沙上的兵不卸甲、大白高国的兴起灭亡、红色西路军令人沾襟的历历??历史的疼痛和治世者的匠心都在这片土地上勾勒出独一无二的完美呈现。如今,一条条与景色完美融合的旅游公路,或山村公路,     

裁的是输赢,判的或是轨道交通的未来

正"行业组+学生组"的竞赛模式、"真机+模拟器"的技术比拼、来自不同地域的60名轨道列车司机和87名轨道专业学生组成的参赛选手,以及竞赛过程中可能遇到的各种突发状况……与体育竞技类比赛一样,第八届全国交通运输行业"中车株机·捷安杯"轨道列车司机职业技能竞赛总决赛的赛场紧张而激烈。而担任竞赛裁判工作的38名裁判员,在获得选手们认可的同时,认真严谨、公正执裁的敬业精神,也给所有人留下了深刻的印象。"裁判在执裁过程中,必须坚持公平、公正、     

Modelling acceleration decisions in traffic streams with weak lane discipline: A latent leader approach

Acceleration is an important driving manoeuvre that has been modelled for decades as a critical element of the microscopic traffic simulation tools. The state-of-the art acceleration models have however primarily focused on lane based traffic. In lane based traffic, every driver has a single distinct lead vehicle in the front and the acceleration of the driver is typically modelled as a function of the relative speed, position and/or type of the corresponding leader. On the contrary, in a traffic stream with weak lane discipline, the subject driver may have multiple vehicles in the front. The subject driver is therefore subjected to multiple sources of stimulus for acceleration and reacts to the stimulus from the governing leader. However, only the applied accelerations are observed in the trajectory data, and the governing leader is unobserved or latent. The state-of-the-art models therefore cannot be directly applied to traffic streams with weak lane discipline.This prompts the current research where we present a latent leader acceleration model. The model has two components: a random utility based dynamic class membership model (latent leader component) and a class-specific acceleration model (acceleration component). The parameters of the model have been calibrated using detailed trajectory data collected from Dhaka, Bangladesh. Results indicate that the probability of a given front vehicle of being the governing leader can depend on the type of the lead vehicle and the extent of lateral overlap with the subject driver. The estimation results are compared against a simpler acceleration model (where the leader is determined deterministically) and a significant improvement in the goodness-of-fit is observed. The proposed models, when implemented in microscopic traffic simulation tools, are expected to result more realistic representation of traffic streams with weak lane discipline.     

智能交通世界大会将首次登陆中国

2007年10月,已连续举办13届的智能交通世界大会将首次在中国举行,这也是该大会首次来到发展中国家,北京市交通委员会副主任刘小明在2月28日的智能交通世界大会新闻发布会上称.     

TBM现场首装新方法

在大直径TBM越来越普遍的情况下,现场首装方法可以节省时间和成本.罗宾斯公司的Desiree Wills对这一新方法的相关原理进行了解释.     

道路运输上半年政绩扫描

7月4日,交通部部长李盛霖主持召开部务扩大会议,总结上半年工作,分析当前交通发展面临的形势和存在的突出问题,部署下半年的重点任务.李盛霖强调,要进一步提倡求真务实的思想作风和工作作风,深入调查研究,为完成"十一五"各项任务开好局、起好步.     

沪杭线旅客出行调查报告

本次调查分两方面,一是对公路旅客的调查,通过发放调查表的形式进行.二是对铁路旅客的调查,通过在火车站候车室、随车问卷调查以及个别交谈等形式进行.调查共开展两次,公路旅客回收有效问卷1 801份,铁路旅客回收有效问卷711份.     

A generic class of first order node models for dynamic macroscopic simulation of traffic flows

Node models for macroscopic simulation have attracted relatively little attention in the literature. Nevertheless, in dynamic network loading (DNL) models for congested road networks, node models are as important as the extensively studied link models. This paper provides an overview of macroscopic node models found in the literature, explaining both their contributions and shortcomings. A formulation defining a generic class of first order macroscopic node models is presented, satisfying a list of requirements necessary to produce node models with realistic, consistent results. Defining a specific node model instance of this class requires the specification of a supply constraint interaction rule and (optionally) node supply constraints. Following this theoretical discussion, specific macroscopic node model instances for unsignalized and signalized intersections are proposed. These models apply an oriented capacity proportional distribution of the available supply over the incoming links of a node. A computationally efficient algorithm to solve the node models exactly is included.     

筹建全国物流大平台——北京宝龙物流有限公司董事长孙京学专访

透过宽大的窗户放眼望去，繁忙空中航线上飞机忙忙碌碌，两三分钟就有一架掠过；南边100米左右就是京秦线铁路，动车组和货运专列来往飞驰；北部500米即为车流穿梭的京哈高速公路。北京宝龙物流有限公司（以下简称“宝龙物流”）在通州区西果园的总部大楼，每天都能与“铁公机”综合运输亲密接触，而这片占地一百亩、拥有近三万平方米标准仓储库房的办公区域，     

南水北调西线第一期工程深埋长隧洞技术研究

南水北调西线工程地处青藏高原东南部,规划从长江上游调水170亿立方米,经输水隧洞穿越巴颜喀拉山分水岭入黄河上游,为西部大开发提供水资源保障.调水工程区海拔3 500m,寒冷缺氧,地质条件复杂.第一期工程调水40亿立方米,线路总长260 km,其中隧洞长244km.文章简要介绍了隧洞工程的地质条件、掘进机选型、掘进速度以及施工通风技术等.根据国内外隧洞的技术发展趋势,对未来长隧洞施工作了初步研究.     

先修《邮政法》还是先改革?

邮政快递之争由来已久 2006年2月中旬,55岁的上海东方万邦快递有限公司的副总经理刘和平,已经没有心思跟家人一起过元宵节了,因为他将又一次赶往上海浦东国际机场,为《邮政法》修改稿第7稿的出台代表民营快递企业进京"告御状".围绕着邮政法的修改,刘和平已经把自己在上海和北京之间"快递"了无数次.     

Using GPS data to analyse the distance travelled to the first accident at fault in pay-as-you-drive insurance

In this paper we employ survival analysis methods to analyse the impact of driving patterns on distance travelled before a first claim is made by young drivers underwriting a pay-as-you-drive insurance scheme. An empirical application is presented in which we analyse real data collected by a GPS system from a leading Spanish insurer. We show that men have riskier driving patterns than women and, moreover, that there are gender differences in the impact driving patterns have on the risk of being involved in an accident. The implications of these results are discussed in terms of the ‘no-gender’ discrimination regulation.