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为了在高层建筑改造中实现更有效的消能减震,本文鉴于结构改造的发展状况及地震风险的考虑,通过介绍消能减震技术的创新应用,分析其在建筑改造中的作用。通过结合案例研究,提出在高层建筑和核心筒建筑改造中采用消能减震技术的观点。研究结果表明,消能减震技术能够显著降低地震对建筑物的影响,提升结构的抗震性能。本文得出结论,消能减震技术在高层建筑或核心筒建筑改造中具有创新应用的潜力,可为工程实践提供有益的指导。 相似文献
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针对Fluent软件流体计算能力应用于膨胀节设计中,介绍了在高温高流速介质下膨胀节温度场分布计算方法.膨胀节内流体介质为750℃的高温介质,且流速高达100 m/s.膨胀节采用双插式内衬结构,借助Fluent软件进行流热耦合计算,得出温度场分布情况.同时,基于Fluent软件对于通过波纹管流体的压降进行模拟,通过CFD... 相似文献
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文中对测温元件保护套管进行三维建模,采用Fluent软件对管道内流体进行模拟仿真和分析计算,并研究不同插入深度下管内流体的流态特征,为工程设计或安装施工提供参考。 相似文献
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我国煤炭产消运空间格局分析 总被引:2,自引:0,他引:2
本文分析我国煤炭生产、消费、调运的空间分布及其演变,并综合考虑煤炭资源储量、生产、消费、调运等因素,对我国煤炭产、消、运区域类型进行划分。在此基础上,针对我国煤炭生产、消费、运输空间格局变化产生的新问题提出几点建议。 相似文献
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Pierre Merlin 《运输规划与技术》2013,36(1):39-52
A decade of increasing Federal attention to urban transportation needs has culminated in the 1970 Urban Mass Transportation Assistance Act. This Act is intended to provide 10 thousand million dollars over the next 12 years in Federal assistance money to urban public transportation systems. This paper examines the needs of selected U.S. cities as a basis for (1) understanding the vast, various and complex transportation needs of urban areas throughout the country, and (2) assessing the sufficiency of these funds. The sample cities have been placed into three broad categories based on the state of development of their transportation systems. In Category I cities, the essential need is to ensure the survival of bus systems for the use of non‐drivers, or to provide some other viable alternative to the automobile; in Category II cities, the primary needs are to relieve auto congestion and to improve public transportation components, while in Category III cities, the primary need is massive investment to improve and to extend public transportation facilities. It is concluded that the presently intended Federal funding level for transportation will not meet the financial requirements of the Category III cities. 相似文献
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为解决纯电动汽车存在的制动能量耗损及续航里程不足等问题,通过对行车能量流分析的基础上,提出一种制动能量回收及储能策略,并利用ADVISOR软件建立整车制动能量回收策略仿真模型。选取UDDS城市道路工况进行仿真,结果表明所建立的控制策略可以对制动能量进行回收和储存,对于提高纯电动汽车续航里程提供了理论基础。 相似文献
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本文讨论了清洁能源在港口的应用。以宁波港股份有限公司北仑第二集装箱(以下称"北二集司")码头清洁能源应用为例,采用能源替代比较法和排放因子法相结合,分析了清洁能源替代柴油和岸电的节能与减排效果,得出了清洁能源在集装箱码头应用技术成熟、节能减排效果良好的结论,可以为清洁能源在港口的推广应用提供借鉴。同时,为了推广LNG和岸电的使用,建议不将其纳入港口能耗统计范围内。 相似文献
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Kenneth A. Small 《Transportation Research Part A: Policy and Practice》2012,46(6):874-889
This paper assesses the costs and effectiveness of several energy policies for light-duty motor vehicles in the United States, using a version of the National Energy Modeling System. The policies addressed are higher fuel taxes, tighter vehicle efficiency standards, and financial subsidies and penalties for the purchase of high- and low-efficiency vehicles (feebates). I find that tightening fuel-efficiency standards beyond those currently mandated through 2016, or imposing feebates designed to accomplish similar changes, can achieve by 2030 reductions in energy use by all light-duty passenger vehicles of 7.1–8.4%. A stronger feebate policy has somewhat greater effects, but at a significantly higher unit cost. High fuel taxes, on the order of $2.00 per gallon (2007$), have somewhat greater effects, arguably more favorable cost-effectiveness ratios, and produce their effects much more quickly because they affect the usage rate of both new and used vehicles. Policy costs vary greatly with assumptions about the reason for the apparent myopia commonly observed in consumer demand for fuel efficiency, and with the inclusion or exclusion of ancillary costs of congestion, local air pollution, and accidents. 相似文献
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Oreste M. Bevilacqua 《运输规划与技术》2013,36(4):227-240
In this paper, the characteristics of intercity freight modal operations are investigated to evaluate the potential for achieving energy savings. It is determined that the greatest opportunities for conserving energy appear to rest with achieving modal shifts and operational improvements in truck and rail transport. To test this hypothesis, intercity truck and rail freight operations are analyzed to determine the relationships between energy consumption and the delivery of transport service. The energy consumption impact of alternative conservation measures are calculated, and in turn, evaluated in light of a series of institutional constraints. As such, this study goes beyond the characteristic cataloging of alternative energy conservation measures by conducting a disaggregated assessment of the effectiveness and feasibility of implementing such measures. This paper concludes that the potential for achieving energy conservation in the movement of intercity freight in general, and by truck and rail systems in particular, is limited, as well as shrouded by the complexity of the nature of the commodity itself, the commodity flow characteristics, and the market and institutional structure. 相似文献
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Peter White 《运输规划与技术》2013,36(3):143-152
Urban public transport energy use is determined largely by the weight of the vehicle, and frequency of intermediate stops, imposing repeated acceleration/steady running/braking cycles, in which much of the kinetic energy is dissipated. Energy consumed for the same capacity and vehicle performance may be reduced by coasting, cutting vehicle weight, and use of regenerative braking, on electrically‐powered systems, to convert the otherwise wasted braking energy into useful form. Particular attention is paid to the last‐named, identifying results of past experience and recent simulations. Practical constraints limiting the amount of energy actually recovered are discussed, including proportion of vehicle weight braked electrically, receptivity of the supply system, stop spacing and number of vehicles operated simultaneously. Reference is also made to battery vehicles and flywheel energy storage. It is suggested that considerable scope exists in urban electric rail operation for reduced energy consumption, as existing fleets are replaced by lighter weight vehicles, fitted for regenerative braking. Further savings may come from use of inverter equipment. Rate of fleet renewal may be an important factor. Buses are already much more energy efficient, and dramatic gains are unlikely. However, there is some scope for use of flywheel energy storage, and regenerative braking on trolleybuses. 相似文献