高寒高海拔地区公路隧道运营管理思考

高寒高海拔地区公路隧道运营管理问题长期以来备受关注且亟需解决。为保证高寒高海拔地区公路隧道的安全运营,结合我省隧道运营管理的现状,探讨高寒高海拔地区公路隧道运营管理体系的构建,为今后类似地区隧道运营管理提供参考。     

实例演示通风网络理论在公路隧道运营通风设计中的应用

将通风网络理论运用在公路隧道运营通风设计中,是研究公路隧道运营通风的一种新方法;同时解决了在多通路隧道、长大隧道中运营通风的宏观控制问题.     

自动化监测技术在运营地铁隧道中的应用

自动化监测技术在地铁隧道运营期中的应用至关重要,从地铁隧道自动化监测技术的组成结构入手,分析运营地铁隧道自动化监测内容,探讨自动化监测技术在运营地铁隧道中的应用,以供参考。     

电气化铁路隧道移动式运营通风系统研究

目前铁路隧道的运营通风均为固定式通风系统,点多、面广、初期投资大、运营管理困难.文章根据电气化铁路隧道的运营及环境特点,提出了移动式运营通风的概念,采用一套移动通风设备就能实现多座隧道的运营通风,经济合理,具有良好的推广应用前景.     

上海地铁隧道某区段不均匀沉降的成功治理

由于施工扰动和列车的运营震陷影响,当前运营隧道线路上一些地段存在程度不同的隧道不均匀沉降,从而引起道床与管片脱开、隧道纵缝张开、隧道渗漏水等情况。运营隧道的过大不均匀沉降如不及时控制,任其发展,将严重影响地铁结构及运营安全。通过上海地铁某区段双圆隧道不均匀沉降注浆治理工程实践,探讨了软土地区地铁隧道结构不均匀沉降的控制措施,对其注浆工艺和方案的进一步总结,可以为今后其他线路区间隧道结构整治提供参考。     

我国公路隧道运营通风节能研究综述及展望

本文为促进公路隧道运营通风节能研究成果的推广应用,梳理了国内关于公路隧道运营通风节能的主要研究成果及工程应用情况,主要包括多种能量综合利用、通风设备参数及结构优化、通风新理论新方法、通风控制系统和节能控制算法等。总结了当前公路隧道运营通风节能的不足,对隧道运营通风节能的数字化、网联化、智能化发展提出展望。     

高速公路隧道交通运行状态全面感知技术的应用研究

为了提升道路交通运行效率,降低隧道运营安全风险,结合高速公路建设运营实际,分析隧道运营管理现状问题,详细介绍逆向合成毫米波雷达隧道交通运行状态感知技术系统架构与应用效果,以期为相关人员提供参考。     

高速公路隧道通风设计的分析研究

隧道通风系统为隧道运营安全和行车舒适提供有效保障。文章分析了隧道通风计算过程,梳理了隧道通风节能计算的相关思路,采用模糊控制的隧道通风控制策略,提高隧道行车环境的安全性和舒适性,降低隧道通风系统的运营成本,从而起到节能减排的效果。     

高速公路隧道运营安全管理探讨

随着我国经济的高速发展,高速公路建设也在向山区不断地延伸,投入运营的高速公路隧道越来越多,如何安全管理好高速公路隧道,确保隧道行车安全、畅通,已成为新时期高速公路管理面临的一项重要课题。因此,以承德至秦皇岛高速公路秦皇岛段隧道为例,简要介绍了高速公路隧道交通环境与通常道路交通环境的不同,以及对高速公路隧道运营安全管控采取的具体措施,这对其他高速公路隧道运营安全管理具有一定的借鉴意义。     

复合腔体及注浆技术在运营隧道维护加固中的应用

轨道交通运营隧道中多以盾构结构为主,当隧道周围土体发生超载、堆载、位移等变化时将导致隧道结构因内力过大而发生结构变形,直接危及运营隧道的安全。分析了产生隧道结构变形的因素,提出了采用复合腔体新型结构形式的施工工艺。新型结构具有构件小、重量轻、后充填等特点,尤其适合于已损伤运营隧道结构的快速维护加固。     

Analysis of factors affecting the choice of route of pedestrians

Pedestrians as compared to vehicular traffic enjoy a high degree freedom of movement even in heavily congested areas. Consequently, there are more alternative links available to pedestrians between a given origin‐destination (O‐D) pair. This paper describes a study done by the University of Calgary to evaluate the factors affecting the choice of route on intra‐CBD trips or trips within the Central Business District (CBD).

An origin destination survey conducted in downtown Calgary, Alberta enabled the identification of the most significant factors influencing the choice. These factors were analyzed in relation to the physical characteristics of the location, personal characteristics of the trip maker and the type of the trip.

It appears that most people chose the shortest link and factors such as the level of congestion, safety or visual attractions were only secondary. This suggests that the length should be made a major consideration when planning and designing pedestrian links.     

输油管道中原油乳状液的流变性研究

原油乳状液的流变性是原油开采后在管道中输送的重要研究方面,为了更好地研究这一性质,采用电动搅拌机、偏光显微镜以及流变仪等仪器来测定不同含水率的原油乳状液在不同条件下的黏度,观测不同含水率的原油乳状液在偏光显微镜下的形态。并且分别对原油乳状液的黏度与含水率之间的关系以及与剪切速率之间的关系进行研究,初步确定了所测区块原油乳状液的转相点以及该区块原油乳状液的流变特性,为生产中的油气集输提供了理论依据。     

Preliminary results of an analysis of areas of influence in Shanghai

The main deficiency of most current modeling approaches to transportation can be identified as neglect of the integration of existing geographical knowledge in regard to the ex ante transport/land use modeling approaches, with its focus on territorial dynamics and theory development. This paper addresses this aspect of the problem by introducing a theoretical and methodological framework for the analysis of the interrelationship between land uses. The analysis attempts to determine to what extent the functional land use in a city can be considered an ordered pattern. The order sought does not rely on purely spatial configurations, but on the correlation of transportation and land use. The first section of this paper focuses on theoretical considerations. It stresses the fact that conventional approaches do not apply in the present context. It then suggests an alternative based on areas of influence and measured in terms of level of attractance of land uses. The second describes a procedure based on this alternative following the remarkable contribution of Hanjoul, Beguin and Thill. An application of this procedure to the analysis of Shanghai is then examined. Finally, an evaluation of the strategies for optimizing the interrelationship between land uses is presented. The paper concludes with a possible research agenda.     

城市轨道交通杂散电流监测系统概述

介绍了城市轨道交通工程中杂散电流不同的监测系统的构成,分析了集中式、分散式和智能型等监测系统的配置和功能,以及智能型实时在线监测系统的重要意义,为轨道交通工程杂散电流监测系统的选择与应用提供参考。     

埋地管道防腐保温层失效评价

明确埋地管道防腐保温层的技术评价标准,对埋地钢质管道的安全运行,延长管道使用寿命具有重要意义。为了对埋地管道防腐保温层做出有效评价,从间接检测与开挖检测2个方面,结合现场检测数据,提出了基于防腐保温层的电流衰减率、绝缘电阻率、质量状况与厚度的分级评价标准及基于4种评价指标的综合评判方法。工程实践表明,该评价标准对防腐保温层是否存在失效能做出有效判断。     

实现多组态计量软件集中监控的可行性分析

天然气自动计量系统有多种组态软件,由于软件的不相通性,造成了计量系统数据采集的通用性差、数据传输与入库的时效性差、数据利用的可靠性低.结合各组态软件的实际情况,从设计上充分利用Oracle大数据处理能力以及Partition(分区表)的特性,实现历史数据的存储,应用WebService与COM+数据访问组件提供多层数据访问架构,采用OPC与DDE工业数据交换协议,实现了各站场计量数据的实时上传,为连续数据采集和实时监控提供了可能,节约了改造成本.     

注汽管道承压能力评估和实物试验验证

基于失效评估图技术对某注汽管道进行了承压能力评价,给出了管线在不同腐蚀壁厚情况下的极限承压能力和极限裂纹尺寸。并利用实物爆破试验验证了评价方法的安全性和有效性,通过对爆破断口进行宏观和微观分析,发现管段的开裂属于脆性开裂。     

Non-parametric analyses of efficiency of airports

This paper estimates the efficiencies and productivity changes of 12 international airports in the Asia-Pacific region based on data from 1998 to 2006. We apply stochastic frontier analysis (SFA) to compute efficiency estimates and use the Malmquist productivity index (MPI) to analyze productivity changes. We use the SFA model with a translog-type production function after testing the statistical hypotheses. According to the results of the SFA hypothesis tests, airports have experienced a technological regression; the deviations from the efficiency frontier are caused more by technical inefficiency than random noise. However, the inefficiency was found to decrease. The MPI reveals a declining trend resulting more from technological change than from efficiency change, with a decrease in inefficiency. Taken together, both the hypothesis tests and the MPI not only provide consistent conclusions, but also suggest that airports should concentrate on technological progress.     

波纹管应力分析研究进展

评述了波纹管应力理论研究方法的进展情况，围绕解析法、工程近似法和数值法，对波纹管理论研究中的一些主要成果作了较详细的回顾和总结，对各种研究方法作出了评价，展望了亟待解决的一些问题。     

Direct analysis of the perceived importance of attributes of reliability of travel modes in urban travel

Reliability of travel modes was found to be the most important characteristic of transportation systems in several attitudinal investigations of individual travel behavior. This paper represents the first part of a research effort aimed at gaining a better understanding of the characteristics of reliability of transportation modes in urban travel. In this research, reliability characteristics are identified; their importance relative to each other is assessed, and an insight into possible structure of an objective reliability index is discussed. The research is based on perceived values of reliability, which were identified through a large attitudinal survey conducted in the Chicago metropolitan area.