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2011年12月10日,校车草案经过反复征求部门、地方、专家的意见,形成了"保障就近入学,大力发展公交,重点支持农村校车服务"的总体思路,而这无疑给乱象频生的校车市场打了一针强心剂。在新的形势下,校车市场究竟如何走向,一时未有定论,显然,新标准的诞生成为校车产业的首要需求。 相似文献
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《关于推动公路水路交通运输行业IC卡和RFID技术应用的指导意见》(以下简称《指导意见》)于10月下旬正式印发。记者就此专访到交通运输部科技司和参与制定《指导意见》的专家.请他们进行详细解读。 相似文献
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仅从本次地铁调价征求意见的技术角度而言,还有很大的提高空间。本次北京市发改委的做法是先听取公众意见,然后再形成专家意见稿。这样的操作流程,会将大部分的压力集中在意见收集和汇总部门。如果数据量太大,必然极大地增加处理意见的压力。 相似文献
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聚集了宏观经济、交通运输等领域37位知名专家和权威人士的国家“十一五”规划专家委员会存2005年10月成立。在这些专家中,中国交通运输协会常务副会长上德荣先生作为交通运输界惟一的专家代表而引人关注。作为研究综合运输和物流的资深专家,他对“十一五”交通发展和完善我国综合运输体系有什么意见或建议?本刊记者如约干2005年12月27日来到王会长的办公室对他进行了专访。 相似文献
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铁路隧道施工阶段监控量测是保障信息化施工的重要手段,目前关于隧道监控量测项目及内容主要通过围岩级别定性判定,未建立统一的定量化评价体系。基于风险分析理论,依据隧道发生风险概率指数与风险后果指数,建立铁路隧道施工阶段监测等级及划分方法。将未确知测度理论作为风险概率指数评价方法,选取岩石风化程度、岩石质量指标和单轴饱和抗压强度等8个影响指标,构建指标测度函数,结合改进层次分析法对各评价指标进行赋权,依照置信度识别准则判定风险概率指数,定量计算监测等级指数确定监控量测等级及相应的监测内容。以渝昆铁路小草坝隧道为例,对该隧道3个里程区段进行施工阶段监测等级划分,评价结果显示DK344+200~DK344+220区段监测等级为C。 相似文献
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评价指标对模糊综合评价的结果准确性具有直接影响,民航事故征候诱因指标构建的科学性对民航安全评价具有重要现实意义,但传统层次分析法存在对专家经验要求高、主观因素对评价结果影响大等局限,区间数特征根法(IEM)可弥补其不足。首先运用SPSS软件对民航事故征候诱因指标进行相关性和因子分析,得到了指标之间关联性特征,然后运用MATLAB软件构造IEM程序,得出影响民航事故征候诱因指标权重。结果表明:皮尔逊相关系数法、因子分析法、IEM的联合使用可减少评价体系的冗余度,为指标和权重确定的合理性奠定理论基础。 相似文献
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依据国内外现有的研究成果及现行的隧道设计规范,分析研究高速公路隧道交通安全影响因素;选取合理的评价指标,结合专家意见,运用层次分析法计算确定各指标权重,建立评价指标体系;依托某高速公路石古嶂隧道工程实例,对评价方法进行应用及验证。 相似文献
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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. 相似文献
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《Transportation Research Part A: General》1991,25(6):407-418
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. 相似文献
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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。 相似文献
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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。 相似文献
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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. 相似文献
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Joseph N. Prashker 《Transportation》1979,8(4):329-346
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. 相似文献
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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. 相似文献