共查询到18条相似文献,搜索用时 203 毫秒
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未来交通环境下,大规模的智能电动车辆将与城市智能交通网和智能配电网相互作用并相互影响。本文将三者有机结合起来,建立了"车-网-路"智能交互系统模型。该模型包括城市中压配电网模型、道路交通网模型和以快速充电方式充电的大规模智能纯电动汽车模型。在此基础上,基于Dijkstra最短路径算法,提出了具有实时电网和交通信息反馈的智能电动车辆最优充电路径规划方法。最后,通过MATLAB和MATPOWER联合仿真系统对该规划方法进行了仿真评价。仿真评价结果表明,本文提出的最优充电路径规划方法,相比目前广泛采用的最近充电路径规划策略,将能有效降低大规模智能电动车辆快速充电对道路交通网和中压配电网的不利影响。 相似文献
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城镇化本质上是人与土地产生新型关系的进程.因此,以何种方式聚集,怎样协调相互发生关系的人与地,便成为城镇化过程中的关键问题.新中国成立以来,中国人民对建立人、地合理配置方式进行了积极的探索,大城市论和小城镇论是其中最具代表性的两种观点.60多年的实践告诉我们,"大"、"小"两种发展模式都没有处理好城镇化进程中人与地、人... 相似文献
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近年来医院发展朝着大型化和综合化形式迈进,同时也带来了一系列交通问题。本文就医院外部集散空间布局形式进行研究并改进,以缓解大型医院外部的交通拥堵混乱问题。通过分析大型医院外部空间的使用需求,重新界定了医院交通集散空间的范围与功能;结合其空间流线需求与建筑广场、城市道路设计理论,分析了医院集散空间的交通特征与规划要点;最后提出了各功能区布局原则,并从医院内外临时停车、交通设施布置、道路功能划分等方面阐明了医院交通集散空间的规划方法。针对不同形式医院的布局,分别设置了复合立体型、平面广场型和用地紧缺性三种形式,为城市规划设计者提供参考。 相似文献
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改革开放以来,我国经历了快速的城市化发展阶段,呈现出城市化发展速度快、城市化水平区域差异大等显著特征.行政区划属于上层建筑,是国家进行区域划分和行政管理的主要依托和重要途径.本文以为,伴随着社会经济和城市化进程的快速发展,行政区划必然要进行相应的调整,以便与经济基础相适应.从行政区划的角度看,我国的城市化发展还存在一系... 相似文献
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我国正处于快速城市化时期,人口和产业向城市加速聚集.从已有的国际经验看,在这一阶段城市快速发展与防灾能力不足的矛盾将日益尖锐,城市脆弱性将日益突出.作为目前世界上灾害最严重的国家之一,如何最大限度地降低城市脆弱性,切实有效地提高城市防灾减灾能力,推动城市化安全和健康发展,已经成为我国当前所必须面对的重要问题.本文将借鉴... 相似文献
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利用安徽省宿州市1999—2010年的统计数据,运用塞尔奎因-钱纳里标准法分析其城市化与工业化发展阶段,采用协整检验、Granger因果检验对其城市化与工业化的因果关系进行实证研究。结果表明:1)宿州工业化和城市化水平低于全国平均水平,均处于初期发展阶段;2)宿州城市化与工业化有高度相关关系,城市化滞后于工业化;3)宿州当前城市化发展是工业化发展的Granger原因,加快城市化发展有利于促进工业化水平提高;4)宿州城市化水平与第二产业增加值比重和第三产业增加值比重具有长期稳定的协整关系,但与非农就业人口比重不存在长期稳定的均衡关系;5)宿州城市化水平与第二产业增加值比重和第三产业增加值比重的弹性系数分别为0.21和0.86,说明其城市化水平对第三产业的拉动作用要比对第二产业的拉动作用更大一些。因此宿州市应促进人口向中心城区的集聚,发挥城市化对工业化的促进作用。 相似文献
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《工程研究》2012,4(4):362-371
Population urbanization is closely related to carbon emission control, but the relationship between them is uncertain. Population urbanization makes carbon emit more greatly, which is the main cause of carbon emission increase. Therefore, population urbanization can also be the “key” to control carbon emission effectively. This article constructs the analysis framework of carbon emission control mechanism in the aspect of population urbanization, and identifies it preliminarily: the development of population urbanization will increase the number and scale of cities; the spatial distribution, the life and the production activities of the urbanized population con-stitute the three city depa rtments-life, traffic and production, which are also the three sources of carbon emission. It is the increase of number and scale of cities, different flow of migration to cities and the changes of the spatial distribution, the life and the production activities of the urbanized population that leads to different carbon emis-sion. This is not only the carbon emission mechanism of population urbanization, but also the clue to the scientific way to promote the low carbon of population urbanization. 相似文献
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基于投入导向的规模报酬不变的超效率数据包络分析方法,运用EMS1.3.0软件测算2003-2009年全国各省市(区)的生态效率评价值,并通过建立城镇化的生态效率效应模型,实证检验中国城镇化进程中的生态效率变化趋势及其影响因素.研究结果表明,城镇化水平与生态效率之间呈正U型变化关系,即在城镇化的初期阶段,生态效率不断降低... 相似文献
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The Yellow River basin and neighborhood have played an important role in many respects, such as national energy security, ecological safety, food safety, and urbanization development. But the shortage of water resources is the biggest restrictive factor for its regional development. The West-Route of South-to-North Water Diversion is the main component of national water resources allocation pattern, as well as the most fundamental approach to effectively relieve the water shortage of Yellow River. The condition of water resources, the demand of future development, the solution of water shortage, and the function of West-Route Project are all analyzed in this paper. The paper also discusses the necessity and urgency of West-Route project of South-to-North Water Diversion from the perspectives of national energy security, ecological safety, food safety, and urbanization development. 相似文献
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Shi Changxu 《工程研究》2013,5(1):5-11
The development of new material industry, including structural materials and functional materials is the pilot force of industry development. There are some problems in China’s new material industry development. For example, no supply of some important material, fail to meet the quality requirement of existing material, under-developed researching equipment of new material and the high environmental cost of material producing process. The construction of new material industry system is the solution to these problems. The new material industry system refers to the production of middle and long term need new materials. It is a comprehensive system formed on certain orders and internal connection with different new material producing subsystems. There are ways to realize this system: sort out the existing new materials; set up several demonstration enterprises and testing bases; tackle several recognition problems; adhere to institutional innovation; research new materials that could industrialize; implement concrete measures, including engineering and industrial measures. 相似文献
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This paper analyzes the theoretical connotation of urban agriculture and sustainable urban development, and their interactions. Based on the analysis, this paper proposes a series of policy optimization approaches and engineering optimization measures in coping with the urbanization problems and promoting the sustainable urban development. 相似文献