如何加强我县农村公路养护和管理

通过湟源县对农村公路的养护和管理工作实践,阐述了道路的使用只有同科学的管理与及时、专业地养护相结合,才能获得良好的效果和理论,并提出了相应的措施。     

湖南省农村公路养护问题分析

介绍湖南省农村公路建设和养护现状,分析目前农村公路养护工作过程中存在的问题,提出解决农村公路养护问题的对策,为加强农村公路的养护管理、提高农村公路的使用寿命、保障交通的顺畅提供参考建议。     

农村公路养护管理现状及发展思路研究

文章通过调查国内外农村公路养护管理情况,分析了我国农村公路养护管理面临的问题,并提出相应的发展思路,对提高农村公路的养护管理水平有一定的指导意义。     

农村公路工程预防性养护应用要点分析

为了控制农村公路的病害,降低农村公路养护成本,以龙里县为例,分析农村公路工程预防性养护应用中存在的问题,提出农村公路工程预防性养护应用管理措施,以期为同类型养护施工提供参考。     

农村公路养护技术探究(门源回族自治县农村公路养护队门源810300)

随着我国逐年增加的农村公路建设,也随之增加了通车里程,并极大的改善了行车条件,为农民群众出行提供了便利,加快了经济的发展。为了使农村公路应用服务寿命进一步延长,深入研究农村公路养护技术,并做好定期防护工作非常关键。一直以来,因为缺乏养护资金,许多已经建成的农村公路缺乏必要的管理和维修养护,因此具有非常突出的失管失养问题,极大的影响了农民群众的日常出行以及运输交流。本文首先分析了加强农村公路预防性养护措施的意义,剖析了农村公路养护中存在的问题;最后,提出了完善农村公路养护管理的相关建议,以期提升农村公路养护建设水平,提高使用效益。     

浅析我省农村公路养护与管理工作面临的问题

详细论述了西部大开发以来青海省农村公路养护与管理工作取得的成绩,并深入分析了存在的主要问题,最后给出了相关意见和建议。     

浅谈农村公路桥梁养护与管理对策

文章总结了＂十一五＂期间广西岑溪市农村公路建设取得的成绩,分析了当前岑溪市农村公路桥梁养护与管理的现状及存在问题,提出了＂十二五＂期间岑溪市农村公路桥梁养护与管理的相关对策。     

农村公路养护技术及病害防治

农村公路普遍采用水泥混凝土路面和沥青混凝土路面,经过长期使用,路面会因各种原因产生破损,影响公路的正常运行,甚至会降低路面的使用寿命。为了提高农村公路的养护水平,对农村公路的常见病害和成因进行分析,提出农村公路养护技术应用与病害防治策略,以期为同类型养护工作提供参考。     

关于阿拉善地区农村公路管养长效机制的思考

文章分析了阿拉善左旗公路管理养护现状及存在的问题，提出了建立阿拉善地区农村公路养护管理长效机制的思路，为该地区加强农村公路养护管理，实现交通事业可持续发展提供参考。     

新形势下农村公路建设管理与养护工作研究

为了更好地满足农村地区当前的交通需求、推动农村经济保持持续稳定的发展和提高农民生活水平,对农村公路的建设、管理和维护展开深入的研究变得十分迫切。基于此,阐述农村公路建设与养护管理现状,分析农村公路建设与养护管理体制存在的问题,提出加强农村公路建设管理与养护工作的对策。     

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.