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文章从塌方风险、瓦斯风险、涌水突泥等方面,分析了山区隧道施工风险因素,建立了风险评估矩阵,确定了风险评估级别,并结合已发生的山区隧道施工事故和该研究领域的相关文献,从四个方面提出了山区隧道施工风险的控制方案,具有一定的理论研究意义。 相似文献
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本文从旅游景区公示语日译研究现状出发,运用文献计量、案例分析、实地调研等方法,揭示旅游景区公示语日译研究的问题,并对旅游景区公示语日译研究提出避免刻板翻译、充分考虑文化差异和用语习惯、加强译者专业水平和责任意识和强化监管等4点建议。 相似文献
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文章通过阐述现代步行理论发展史,探讨步行在各个时期的重要度的基础上,以步行指数为例,从社会、经济、政策三个方面对步行指数的运用研究进行了国外文献综述,最后指出步行指数对我国步行性社区的研究具有借鉴性和实践性。 相似文献
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《运输经理世界》2020,(3)
通过分析近年来我国冷链物流领域的相关文献,梳理及预测目前我国冷链物流领域的研究热点以及未来发展趋势,为后续的研究提供参考。检索中国知网核心期刊中以"冷链物流"为主题词的相关文献,运用Citespace软件对所检索的文献进行可视化分析并生成知识图谱。研究表明:国内冷链物流的文献数量大体逐年增长;其中曲阜师范大学李学工在冷链物流研究领域发表19篇,发表文章最多。500位作者共组成118个族群,有其中由作者长沙铁道学院教授谢如鹤、中国农业大学张小栓、曲阜师范大学李学工、上海海洋大学刘升等在冷链物流研究方面造诣颇深,以长沙铁道学院教授谢如鹤、中国农业大学张小栓、上海海洋大学刘升等形成了较大组织形式的合作关系;冷链物流研究机构在我国较为分散,没有固定区域且发文量都不高。然而合作机构产出比大且聚集。从发文机构分布图谱可以看出,冷链物流研究机构主要为高等院校。 相似文献
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为从宏观上了解交通事故的研究态势,利用文献计量法对WOS数据库收录的474篇文献进行数据可视化分析。研究发现,发文量历经了零阶段、稳定阶段和上升阶段;中国研究机构数量和发文量都位于世界第一;研究领域形成了由122位作者组成的核心作者群体;研究方向经历了以交通参与者、道路交通事故、交通事故安全为研究目的的变化;关键词分析得出该领域未来的研究热点将集中在交通事故安全、交通事故严重程度及交通事故影响三方面。 相似文献
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海洋贸易过程中船舶压载水引发的港口外来生物入侵风险,其形成受多方因素影响,监控管理难度大,是当今港口海洋生物入侵领域的研究热点。为了全面了解全球港口外来生物入侵风险评估方面的研究现状和发展趋势,本文采用Histcite文献分析工具,以1998-2018年Web of Science数据库和CNKI中国知网全文数据库中相关文献为研究对象,从文献年份变化情况、类型分布、来源分布、国家研究力量和被引频次计量等方面进行统计分析。研究内容主要围绕外来海洋生物入侵和压载水生物入侵的风险评估方法、风险评价指标体系、海洋生物生态安全数据分析及可视化方法方面,未发现全球标准化风险评估方案。 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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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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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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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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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
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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