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本文着重将电动汽车区域性示范运行视为一个由7个子系统构成的系统工程,通过研究和界定子模块的关联机制和构成要素,从统筹评价的角度建立了电动汽车示范运行评价体系,为示范城市政府指导、评估各种示范运行方案提供方法论的基础和决策依据,为厂商的规模化和商业化推广电动车提供理论思路。 相似文献
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到2018年底,大批现代化客站的建成为我们积累了大量的工程实践和设计经验。在此过程中,创建精品客站、彰显地域文化特色逐渐成为了新时代铁路客站建设的基本要求。为了探索新时代客站地域文化的体现方式,在分析归纳已建成客站外部造型地域文化性的表现手法及设计思路的基础上,从设计理念、文化元素符号提炼和应用、材料选择、色彩使用、施工工艺等方面对地域文化性的体现手段进行探讨,得出"以细节为切入点,在内部空间体现地域文化性是客站今后建设的一个重要方向"的结论。总结出客站内部空间体现地域文化性的过程中需遵循的传承与创新、统一与协调、美观与经济三个设计原则。 相似文献
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石冰 《西安交通大学学报(英文版)》1995,(2)
NITRICOXIDESYNTHESISINHIBITIONENHANCESBUPIVACAINECARDIOTOXICITYJ.E.Heavner,ShiBing;M.Pitkanen(DepartmentofAnesthesiology,Texa... 相似文献
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Spillback congestion in dynamic traffic assignment: A macroscopic flow model with time-varying bottlenecks 总被引:1,自引:0,他引:1
Guido Gentile Lorenzo Meschini Natale Papola 《Transportation Research Part B: Methodological》2007,41(10):1114-1138
In this paper, we propose a new model for the within-day Dynamic Traffic Assignment (DTA) on road networks where the simulation of queue spillovers is explicitly addressed, and a user equilibrium is expressed as a fixed-point problem in terms of arc flow temporal profiles, i.e., in the infinite dimension space of time’s functions. The model integrates spillback congestion into an existing formulation of the DTA based on continuous-time variables and implicit path enumeration, which is capable of explicitly representing the formation and dispersion of vehicle queues on road links, but allows them to exceed the arc length. The propagation of congestion among adjacent arcs will be achieved through the introduction of time-varying exit and entry capacities that limit the inflow on downstream arcs in such a way that their storage capacities are never exceeded. Determining the temporal profile of these capacity constraints requires solving a system of spatially non-separable macroscopic flow models on the supply side of the DTA based on the theory of kinematic waves, which describe the dynamic of the spillback phenomenon and yield consistent network performances for given arc flows. We also devise a numerical solution algorithm of the proposed continuous-time formulation allowing for “long time intervals” of several minutes, and give an empirical evidence of its convergence. Finally, we carry out a thorough experimentation in order to estimate the relevance of spillback modeling in the context of the DTA, compare the proposed model in terms of effectiveness with the Cell Transmission Model, and assess the efficiency of the proposed algorithm and its applicability to real instances with large networks. 相似文献
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西部陆海新通道货运量预测研究 总被引:1,自引:0,他引:1
西部陆海新通道在区域协调发展格局中具有战略地位,对我国深化陆海双向开放、推进西部大开发形成新格局等具有重要意义。在分析西部陆海新通道总体规划及铁路网规划的基础上,结合西部陆海新通道功能定位,分析货运量影响因素,从区域间货运量、对外贸易货运量、分流沿江通道货运量3个方面进行运量预测。针对每部分货运量,在分析历年货运量的基础上,综合采用多种预测方法,最终得到通道总货运量。西部陆海新通道货运量预测结果可以用于指导区域路网规划、运输组织优化及发展战略制定。 相似文献
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区域轨道交通与城市轨道交通衔接模式 总被引:3,自引:2,他引:1
简要阐述区域轨道交通和城市轨道交通的基本概念,在分析区域轨道交通和城市轨道交通技术特征的基础上,提出都市圈的区域城市铁路发展模式,以及区域轨道交通与城市轨道交通的衔接模式.以重庆1h经济圈的轨道交通布局为例,探讨1 h经济圈城市铁路与城市轨道交通的衔接方案. 相似文献