道路危险货物运输企业安全管理问题的探讨

分析了道路危险货物运输企业的发展现状,指出道路危险货物运输企业安全管理存在的不足,提出了加强道路危险货物运输企业安全管理的措施。     

城市轨道交通项目合同全过程管理

轨道交通项目建设机构在建设过程中对整个项目的全过程的合同管理,大致可分为招标策划、资格预审、招标与定标、合同执行、合同总结与后评估、合同管理培训等六大阶段。介绍了每个阶段合同管理的重要性,并提炼出全过程管理中各阶段的关键控制点。     

轨道交通涉外设备系统采购合同条款的设置

在轨道交通工程项目中,设备系统具有投资比重大、系统性强、涉外投标人严谨度高等特点。为帮助国内招标人员全面了解涉外设备系统标合同执行的特点和国际惯例,以便在合同条款的设置上把握主动权,从合同语言、付款方式、交货方式等九大方面对此进行了总结,使之能从源头上加大力度对合同进行全过程控制。     

推动容县农村客运健康快速发展的对策思考

文章结合容县农村客运现状,分析了农村客运发展存在的问题与原因,提出了发展农村客运的对策与保障措施。     

架空裸管冬季输送-5号柴油结蜡溶蜡规律实验

在环境温度较低的冬季输送-5号柴油时,当外界温度低于柴油析蜡点温度时,油品中的蜡晶会析出附着在管壁上,后行油品使其溶解会导致混油段拉长、混油量急剧增加。通过对-5号柴油在低温状态下进行结蜡溶蜡实验,得到-5号柴油在冬季输送时结蜡溶蜡规律。针对南方某石化公司罐区至供销部码头管线的实际情况,分析结蜡溶蜡规律,提出冬季气温低于-5号柴油析蜡点温度时的油品输送方案,为南方某石化公司供销部储运设施及能力整合优化提供依据。     

Designing computable general equilibrium models for transportation applications

This paper presents a review of Computable General Equilibrium (CGE) model applications for spatial economic and transport interaction modelling. This paper has three objectives (1) To deliver an up to date and comprehensive literature review on applications of CGE models in transportation, (2) To analyze the different methodological approaches and their theoretical and practical advantages and disadvantages, and (3) To ultimately provide guidance on designing CGE models for various transportation analyses. The content of the paper is as follows: first, a brief introduction to CGE models is provided. The history of CGE models is traced, ranging from their origins and seminal applications in economics, to their eventual adoption in transportation research. This is followed by a comprehensive review of the application of CGE models to transport projects and policies. Various applications in transportation are reviewed in terms of their intended application, as well as their treatment of space and time. Finally, these applications are contrasted with respect to their methodological approaches, with a close examination of various influential model choices. Here, the essential design choices made within these model applications are explained and debated, to clearly elaborate on the workings of the models and the design choices facing CGE model developers.     

A fuzzy logic-genetic algorithm approach to modelling public transport users’ risk-taking behaviour

This paper seeks to determine the effects of uncertainty in out-of-vehicle times on route choice. Data were collected at two key interchanges in Auckland, New Zealand. Previous work modelled the data using a manual approach to fuzzy logic. This study extends that work by automating the process through defining a black-box function to match the survey data, then employing a genetic algorithm to fine-tune the fuzzy logic model. Results show that automation and the genetic algorithm improve the model’s capability to more accurately predict ridership. The tuning of the membership functions is conducted twice, first using initial fuzzy rules and again after the fuzzy rules have been adjusted to reduce disparity between the output and survey data. The calibrated membership functions provided for operational (transfer waiting and walking time and delay) and physical attributes (safety and seat availability) can be used by practitioners to determine an estimated ridership.     

金沙江梯级开发航运发展条件研究

介绍金沙江中下游航道与港口现状及发展规划和水电开发利用规划,对金沙江航运经济腹地进行综合交通运输体系分析并对典型路径运输成本进行测算。在调研分析的基础上,对金沙江客货运量和主要港口吞吐量进行预测。结合水电梯级开发对航道条件的影响,分析金沙江航道开发潜能,提出长江干线航道上延至金沙江的合理区段。针对金沙江中下游4个水电枢纽的现场条件,分析适应翻坝运输的货种对象,提出过坝线路选择与运输组织的原则,开展"水-陆-水"翻坝运输方案与"陆-水"公路短途驳运方案的技术经济分析。以期为金沙江攀枝花—水富段航运资源开发论证提供参考。     

绞吸挖泥船串联接力泵船远距离输送工艺

绞吸船串联接力泵施工为目前长排距施工的主要方案,得到广泛的应用。针对如何能够使泥泵间的输送能力相匹配、达到稳定运行并发挥合理的生产能力的问题,以华能曹妃甸5000万t/a煤码头项目围海造陆吹填工程为例,通过对施工中各种典型工况的分类与计算,探索施工的变化趋势,分析接力泵船的船位合理布置范围。     

勘察设计企业内河水运市场建设机遇分析

以往我国水运建设的重点领域为沿海地区,对内河水运建设的关注度不足。为助力水运工程勘察设计企业更好地认清并把握内河水运市场建设机遇,对内河水运方面的数据和规划资料进行梳理和分析,论述内河水运发展现状及趋势,厘清我国内河水运建设的重点领域,认为内河码头及相关水利设施的建设是当前乃至未来一段时期内我国水运建设领域的重点任务,内河专业化码头工程、内河物流节点项目、航道及水利工程、跨境国际水域工程等值得重点关注。