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   3109篇
  免费   499篇
公路运输   752篇
综合类   1396篇
水路运输   495篇
铁路运输   613篇
综合运输   352篇
  2025年   45篇
  2024年   66篇
  2023年   85篇
  2022年   97篇
  2021年   140篇
  2020年   121篇
  2019年   90篇
  2018年   88篇
  2017年   128篇
  2016年   122篇
  2015年   148篇
  2014年   209篇
  2013年   246篇
  2012年   250篇
  2011年   275篇
  2010年   231篇
  2009年   211篇
  2008年   205篇
  2007年   222篇
  2006年   204篇
  2005年   152篇
  2004年   99篇
  2003年   46篇
  2002年   28篇
  2001年   32篇
  2000年   16篇
  1999年   13篇
  1998年   7篇
  1997年   4篇
  1996年   7篇
  1995年   5篇
  1993年   2篇
  1992年   2篇
  1991年   3篇
  1990年   2篇
  1989年   5篇
  1988年   2篇
排序方式: 共有3608条查询结果,搜索用时 15 毫秒
181.
液化天然气(LNG)接卸港工程   总被引:1,自引:0,他引:1  
介绍了LNG国际贸易、接收站建设、LNG运输船、接卸港口工程的选址及设计、分销输运方式,讨论了关于《液化天然气码头设计规程》(试行)的修订意见。  相似文献   
182.
刘晔 《水运工程》2005,(10):24-27
介绍韩国集装箱港口的现状、发展规划,以及在功能定位、建设标准、总体布置和设备配置等方面的一些特点。  相似文献   
183.
This article explores how a fresh approach to integrated coastal zone management (ICZM) in Ireland might be forged through the identification of a number of key innovative cross-sectoral professional initiatives and interdisciplinary academic thinking in this sector. It includes three interlinked research themes that assess existing cross-sectoral data management issues (to include an assessment of readiness for the INSPIRE and compliance with the Re-use of Public Sector Information European Union Directives), the degree of cross-pollination between the various sectors involved in managing the Irish Coastal Zone (to identify the need (or otherwise) for capacity- building to encourage cross-fertilization of ideas, skills, and knowledge exchange), and cross-professional competencies (to assess the desire/need (if any) for those working in coastal zone management to add to their existing competencies through continuous professional development or lifelong learning opportunities). Indeed, the specific competencies for coastal practitioners are identified here and these further illustrate the need for professional recognition of the role, responsibilities, and therefore the requirement for an appropriately qualified “Coastal Manager” professional, one that is seen not merely as a nicety but rather a necessity—a core enabler in any future innovative and integrative management approach.  相似文献   
184.
Abstract

Analysis of recent substantive coastal land use management laws shows that their main thrust is to provide for protection of the coastal environment from adverse impacts of uncontrolled development. The four purposes cited most frequently among laws of 17 states were: Protection of wildlife and fisheries, protection of ecosystems or the natural environment, control of development, and enhancement of esthetic values. Other purposes were to: Protect life and property, enhance public recreation, conserve soil, and protect water resources. Development and economic purposes were cited in relatively few laws.  相似文献   
185.
在对盐田港及附近区域环境质量现状调查、监测与评价的基础上,依据相关的环保法规与标准,集合区域社会、经济发展的规划目标,识别规划环境影响的主要因子,提出盐田港区总体规划开发过程中的主要环境问题,从而提出合理开发利用资源、调整经济发展格局及环保综合治理的措施和建议,用以指导建设生态型现代化的盐田港区。  相似文献   
186.
陈华 《港工技术》2021,58(2):39-43
本文结合某港散货港区智慧港口规划项目,介绍了该港南作业区智能化项目的核心在于构建一套适应现代散杂货港口发展趋势、突破传统散货港口作业模式的全新港口智能化系统.本次规划将物联网、大数据技术、AI人工智能、5G等新型基础设施与生产业务融合,创新生产作业流程及资源配置,显著提高港口的作业运营能力、物流协同能力、口岸支持能力、...  相似文献   
187.
Anecdotal evidence indicates that commercial and recreational water-dependent uses have been under development pressure in recent years, and in some cases have been converted to other uses. The conversion of water-dependent uses, which range from commercial shipyards to recreational marinas, may have many public costs, including the loss of access to public trust waters, the loss of jobs and associated economic activity, and the loss of traditional working waterfronts. This two-part study investigated the role of five coastal management programs in the northeastern United States in managing, monitoring, and protecting water-dependent uses. First, coastal managers in Massachusetts, Rhode Island, Connecticut, New York and New Jersey were interviewed to assess the conversion problem. Second, in collaboration with New York City-based Regional Plan Association, follow-up interviews were conducted with coastal managers and local planners in Connecticut, New York, and New Jersey to gain greater insight into the role of coastal management programs and local governments in managing and promoting water-dependent uses. This article presents select findings from this study and discusses recommendations for improving the capacity of coastal management programs and local governments to manage water-dependent uses for the benefit of the public.  相似文献   
188.
Abstract

In June 1987, the U.S. Supreme Court in Nollan v. California Coastal Commission held against the California Coastal Commission. Did this legal landmark signal the rise of a new, conservative jurisprudence of takings? And if yes, did that imply the demise of what had been accomplished by the so‐called quiet revolution in land use control that swept the country in the late 1960s and early 1970s? The complexities of this case cannot be understood apart from the historical evolution of the Coastal Commission's policies through the 1970s and 1980s, particularly its coastal access policies. Because of these policies the Coastal Commission, since its inception in 1972, has been subjected to all kinds of criticism, but at the same time has been widely praised for its balanced approach. These varying assessments of the role and record of the Commission also underly the conflicting viewpoints and arguments of Justices Scalia, who wrote for the majority in Nollan, and Brennan, who filed an extremely strong dissent. The resulting legal uncertainties, added to the political setbacks suffered from a lukewarm legislature and a hostile governor, forced the Commission to temper its assertive mission of maximizing coastal access, at least for the time being.  相似文献   
189.
During the last forty years, Santiago has experienced a series of drastic changes in public transport policies. These changes have ranged widely, from total deregulation to processes that concentrated the management of public transport within the hands of the public sector.  相似文献   
190.
吕波  蔺士忠  许淼 《船海工程》2006,35(5):75-78
采用面向对象的知识表达方法实现了导管弯曲加工工艺知识表示,并将其应用于所开发的导管弯曲加工工艺设计专家系统,实现了导管弯曲加工工艺的自动生成。  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