旧沥青路面就地冷再生施工工艺在公路改造中的应用

旧沥青路面冷再生施工技术充分利用了原本需废弃的沥青混合料,节约了资源,减少了材料成本投入,具有广阔的应用前景。文章基于旧沥青路面再生技术的研究现状,分析了不同旧沥青路面再生技术在公路改造工程中的适用范围,论述了就地冷再生技术的选用原则与施工技术方法,并结合某二级公路改造工程实例,阐述了旧沥青路面就地冷再生施工工艺的具体应用,以供类似工程参考。     

公路工程施工中的沥青路面冷再生技术

在公路工程施工中,沥青路面冷再生技术有重要作用,为提高该技术应用效果,结合工程实例对公路工程沥青路面冷再生技术的应用进行研究。分析了测量放样、旧路面预处理、原材料选择、撒布水泥与乳化沥青、再生路面整形、碾压与养护等沥青路面冷再生技术应用要点。根据检验结果可知,通过合理控制上述要点,该项目的再生基层多项指标满足设计要求,沥青路面结构更加稳固,可保障车辆通行安全,可为同类工程提供参考。     

水泥就地冷再生技术应用与实践探讨

文章结合县道187线K0+000～K16+300段路面大修工程实例,介绍了水泥就地冷再生技术的施工原理,探讨了采用就地冷再生技术进行公路大修、改扩建及日常养护工作的关键性技术措施。     

沥青路面就地冷再生工艺探讨

本文通过工程实例,针对旧沥青路面的就地冷再生改造工程,从混合料配合比设计、旧路病害处治、添加集料及水泥的摊铺整平、冷再生机工作、压实、养护等各个工序的质量控制方面进行了探讨,为同类工程提供参考。     

水泥就地冷再生技术在福州三环路的应用

文章结合福州市三环路试验路水泥就地冷再生技术应用实例,介绍了水泥就地冷再生混合料配合比设计方案及施工工艺,并通过工程现场评定与验收,验证了水泥就地冷再生技术的应用效果。     

冷再生半刚性道路基层修筑技术

针对我国沥青路面结构的特点,依托实体工程开展就地冷再生半刚性基层配合比设计及施工工艺研究。     

就地冷再生技术在公路工程中的应用

由于就地再冷技术能有效保护施工周围环境,所以该技术广泛运用于我国公路工程领域。本文通过实例,详细介绍了就地再生技术在施工中的所有关键工序,充分表明了该技术的可行性,对就地冷再生技术的经济效益及社会环境效益进行了深入分析,实践证明,就地冷再生技术优势突出,不仅施工工序简便,而且能节约20%~30%的费用,经济效益可观,有很好的发展前景。就地冷再生技术的应用不仅可以节约大量的资金,减轻环境污染,还对交通干扰小、改善路面级配、降低孔隙率、延缓路面老化,给我国旧沥青路面改建带来不可估量的经济效益和社会效益。     

冷再生技术在国道324线岑容公路中的应用

目前，冷再生技术广泛用于旧路的维修、改造及升级中。文章结合国道324线岑溪一容县一级公路沥青砼路面大修工程实践，介绍了路面基层冷再生技术及施工工艺。从实施效果来看，冷再生技术有保证质量、施工速度快、工程造价低和节能环保等优点，是一种较实用的公路沥青路面大修养护新的技术。     

就地冷再生技术在沥青路面养护中的应用

本文以沥青路面就地冷再生技术为主要研究内容,就其专用设备的使用情况进行深入探讨,使用能够实现其性能的专用试剂,并且根据国内外不同的设计方法进行合理的原料配比、性能指标和相关标准进行比较深入的分析.结合实际施工经验,总结出此项技术的施工经验,从而切实提高公路养护质量.     

旧沥青路面冷再生技术在农村公路养护中的应用

旧沥青路面冷再生技术是一种较新的具有重要应用价值的公路路面施工技术,结合在农村公路旧沥青路面冷再生技术应用的基础上,分析阐述了旧沥青路面冷再生技术的施工工艺、经验做法及应用价值。     

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.     

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。     

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。     

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。     

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。     

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.     

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.