首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1584篇
  免费   115篇
公路运输   260篇
综合类   947篇
水路运输   116篇
铁路运输   231篇
综合运输   145篇
  2023年   11篇
  2022年   24篇
  2021年   48篇
  2020年   49篇
  2019年   35篇
  2018年   36篇
  2017年   51篇
  2016年   79篇
  2015年   90篇
  2014年   118篇
  2013年   155篇
  2012年   115篇
  2011年   133篇
  2010年   126篇
  2009年   115篇
  2008年   98篇
  2007年   135篇
  2006年   109篇
  2005年   71篇
  2004年   32篇
  2003年   18篇
  2002年   11篇
  2001年   16篇
  2000年   5篇
  1999年   1篇
  1998年   1篇
  1997年   3篇
  1996年   1篇
  1993年   3篇
  1992年   3篇
  1991年   2篇
  1989年   3篇
  1988年   2篇
排序方式: 共有1699条查询结果,搜索用时 15 毫秒
41.
强调了市政公用工程设计变更监理工作的重要性,阐述了施工前、施工中加强事前控制和事中控制的方法,建议加强监理人员职业道德教育,建立完善监理工作各项管理制度,以提高监理效果,确保监理目标的实现。  相似文献   
42.
城乡公交一体化规划方法研究   总被引:1,自引:0,他引:1  
实施城乡公交一体化是加速城镇化进程、全面建设小康社会的配套工程,是构建和谐城乡的重要基础设施。通过分析城乡公交一体化规划与普通城市公交和公路客运规划中的异同,论述了城乡公交一体化规划的几个关键问题以及实施公交一体化的效益,并对公交一体化实施过程中的体制问题提出对策。  相似文献   
43.
解决城市交通问题的重要途径就是发展公共交通,而合理规划城市公交方式和进行有效的管理是保证公交效率的重要环节。该文对城市合理选择公共交通方式、公交运营模式和ITS技术在公共交通中的应用等方面进行了分析,对现代化城市公共交通发展的策略进行了探讨。  相似文献   
44.
围绕测试场地建设、基础设施、测试能力、服务配套等方面,综合分析国内测试示范区发展现状及水平,归纳其面临的突出和共性问题。在此基础上,提出了加强测试示范区统筹协调、加快标准制定、推进测试结果互认和数据共享、建立交流沟通机制等措施和建议。  相似文献   
45.
公交客流规模测算往往存在调查成本受限和准确度要求较高的矛盾.提出基于公交IC卡历史数据与人工补充调查数据的数据融合测算方法,以准确推算公交客流规模.首先根据公交线路的基本属性,采用聚类分析方法划分线路类型,从每一类中选择具有代表性的线路.基于IC卡数据分析公交客流时变特征,运用有序样本聚类Fisher算法将线路小时刷卡量进行聚类分析.划分刷卡量相似时段,进而采用优化方法确定调查抽样率,确定相应的调查车辆进行人工补充调查,最终经过数据融合计算获得公交客流规模.基于上海市某辖区IC卡数据进行案例分析,测算得到三类公交线路的日均客流量.  相似文献   
46.
As noted often by the former California Coastal Commission Executive Director Peter Douglas, the history of how the California coast was saved is a great repository of untold stories. Although the Commission has had a dramatic and tangible impact on California's coastal geography, the public is largely unaware of many of its early accomplishments. This article begins to chronicle the rich stories of California's coastal legacy by telling the story of how the Commission utilized the Coastal Zone Management Act (CZMA) to prevent Southern Pacific Railroad from developing a seven-mile stretch of the Monterey Bay shoreline. In so doing, the Commission helped make possible the creation of the Monterey Peninsula Recreational Trail, a public bicycle and pedestrian path that has grown to sixteen miles in length and runs through the heart of John Steinbeck's world-famous Cannery Row. The controversy also was the subject of the first judicial challenge of a state's federal authority under the CZMA and precluded private commercial and residential development that would have dramatically altered the urban form of the Monterey Peninsula. It is important to tell the story as the Coastal Commission's role in this remarkable accomplishment has been almost completely overlooked.  相似文献   
47.
中等城市出租车保有量适量性研究   总被引:2,自引:0,他引:2  
为了中等城市公交系统的协调发展、居民出行的便利,论证交通方式分担与城市出租车保有量的关系,分别对选择对象、选择结果、固有哑元、出行时间等参数进行分析,并且给出模型的计算方法与参数检验方法;结合空载率的计算公式进行补充论证。研究结果表明:该方法既可以对目前城市所需要的出租车保有量进行测算,也可以对规划年份出租车保有量进行预测,对保证城市出租车的有序与提供良好服务之间的协调发展提供理论依据。  相似文献   
48.
Understanding public perception of the oceans, and relationship between society and the sea is an important key to the sustainable management of marine resources. This research reports the first population-based survey on Taiwanese public knowledge, attitudes, and actions on marine-related issues. The stratified random sampling by county was completed with 1,120 telephone respondents from October to December 2010. More than 60% of the respondents have heard about global warming, sea-level rising, the Gulf of Mexico oil spill, the coral reef bleaching crisis, and Japan whaling fisheries. However, less than 20% of the respondents are aware of Taiwanese domestic marine policies, such as the Ocean White Paper. On resources conservation, 74.7% of the respondents support the bluefin tuna catches regulations and 76.6% agree that the shark fin fisheries will impact shark resources. Education and age are the major affecting variables for resource conservation and knowledge. Higher education and age 40–49 are most supportive of conservation measures. For marine recreational activities, 42.2% of the respondents can swim, and 44.2% of the respondents had not visited the beach in the previous year. The results suggest that the government could establish a specialized agency to strengthen its marine policy and take more actions to protect ocean environment and conserve marine resources. To encourage more Taiwanese to participate in ocean recreational activities, the government could build a safe facility for marine recreation, cooperate with the private sectors in education, and provide outreach to raise public awareness of the oceans.  相似文献   
49.
以《地铁设计规范》为依据,从车辆运用及维修角度,论述了城市轨道交通网络化运营条件下车辆基地的资源共享,包括车辆检修、段场共址建设、综合维修、物质供应和管理、技术培训、专用设备等方面的资源共享原则和注意事项。车辆基地资源共享不仅可满足车辆检修维保的功能需要,同时可有效避免或减少重复建设,节省工程投资,并提高资源利用效率,降低运营成本。  相似文献   
50.
Wind power resources on the eastern U.S. continental shelf are estimated to be over 400 GW, several times the electricity used by U.S. eastern coastal states. The first U.S. developer proposes to build 130 large (40 story tall) wind turbines in Nantucket Sound, just outside Massachusetts state waters. These would provide 420 MW at market prices, enough electricity for most of Cape Cod. The project is opposed by a vigorous and well-financed coalition. Polling shows local public opinion on the project almost equally divided. This article draws on semistructured interviews with residents of Cape Cod to analyze values, beliefs, and logic of supporters and opponents. For example, one value found to lead to opposition is that the ocean is a special place that should be kept natural and free of human intrusion. One line of argument found to lead to support is: The war in Iraq is problematic, this war is “really” over petroleum, Cape Cod generates electricity from oil, therefore, the wind project would improve U.S. security. Based on analysis of the values and reasoning behind our interview data, we identify four issues that are relevant but not currently part of the debate.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号