全文获取类型
收费全文 | 357篇 |
免费 | 16篇 |
专业分类
公路运输 | 14篇 |
综合类 | 57篇 |
水路运输 | 278篇 |
铁路运输 | 6篇 |
综合运输 | 18篇 |
出版年
2024年 | 1篇 |
2023年 | 2篇 |
2022年 | 1篇 |
2021年 | 7篇 |
2020年 | 6篇 |
2019年 | 11篇 |
2018年 | 15篇 |
2017年 | 19篇 |
2016年 | 11篇 |
2015年 | 19篇 |
2014年 | 16篇 |
2013年 | 135篇 |
2012年 | 22篇 |
2011年 | 21篇 |
2010年 | 15篇 |
2009年 | 9篇 |
2008年 | 9篇 |
2007年 | 12篇 |
2006年 | 15篇 |
2005年 | 7篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1997年 | 4篇 |
1995年 | 1篇 |
1992年 | 1篇 |
1990年 | 1篇 |
排序方式: 共有373条查询结果,搜索用时 281 毫秒
291.
This study investigates the effects of sociodemographic and economic status on the differences in environmental awareness, risk perception, and stewardship of the Mekong Delta residents based on a survey conducted in person with 1,006 households across the delta system. Spatial visualization and a multiple correspondence analysis (MCA) were performed on the survey results to discover underlying factors of the participants' responses. The study results revealed that public environmental awareness in the Mekong Delta is still limited. The level of environmental awareness, risk perception, and understanding of stewardship of local people varies by location. Furthermore, how the Mekong Delta dwellers perceive environmental risks and behave toward environmental protection is unlikely to be influenced by their demographic profiles. However, they are significantly affected by the economic status including income levels and sources. Poor economic status was found to significantly hamper pro-environmental behavior of Mekong Delta people regardless of their knowledge of environmental degradation and the related consequences. These findings provide key information to assist policymakers in developing a successful and sustainable disaster risk reduction mitigation plan for the Mekong Delta region. The implications may also be applicable for other coastal zones, which are composed of similar sociodemographic, economic, and environmental conditions. 相似文献
292.
随着我国经济的发展,在北方沿海地区修建的钢筋混凝土桥梁逐渐增多,其海洋环境不但在桥梁建成后对混凝土桥梁造成危害,而且在桥梁兴建过程中,也能发生危害.分析北方沿海地区钢筋混凝土桥梁腐蚀的原因,对于兴建前的预防和兴建后的防护意义重大. 相似文献
293.
辽宁省港口群的组合与发展战略研究 总被引:1,自引:0,他引:1
从目前港口在建设和经营中存在的问题入手,阐述了组合港产生的必要性和必然性.论述了构建辽宁省港口群组合发展的"差异化协调发展模式",形成以大连、营口、丹东、锦州等港口的层次分明、功能互补的总体构架,提出了适应辽宁省港口群的组合与发展的若干建议. 相似文献
294.
Quazi Sakalayen Peggy Shu-Ling Chen Stephen Cahoon 《Maritime Policy and Management》2017,44(8):933-955
Regional ports, as infrastructure in regions, influence transport and regional development policies and planning. The interaction and involvement of regional ports with their stakeholders in the region are pivotal. The conundrum on what constitutes a regional port and thus its region has further complicated this limited researched area. In the extant literature, port and region relationship mainly centres on major metropolitan ports, and pays little heed to regional ports. In this context, this study investigates on how the Australian regional ports can be better involved in regional development. The study adopts a qualitative methodology to explore the Australian regional port stakeholders’ perceptions on port’s role in regional development through 38 semi-structured telephone interviews. Thematic analysis of data assisted by a mixture of NVivo software and manual techniques proposes a conceptual model that may assist policy-making. The key findings suggest that symbiotic growths of ports and concerned regions accelerate regional development. To contribute to regional development, the Australian regional ports can be proactive in building collaboration with regional organisations. The findings have major implications for port managers and port policy-makers for developing a region-oriented long-term port planning and for creating environment for Australian regional ports for regional resource configuration. 相似文献
295.
Logistics connectivity considering import and export for Chinese inland regions in the 21st-Century Maritime Silk Road by dry ports 总被引:1,自引:0,他引:1
This investigation studies the logistics connectivity of inland Chinese provinces along the 21st-Century Maritime Silk Road (MSR) from the perspective of the oriented cooperation relationship between seaports and dry ports in inland regions. The logistics connectivity is measured based on the import and export data. First, complex network theory is used to develop a system for evaluating logistics connectivity of inland regions, involving metrics of susceptible-infected-recovered, and improved closeness centrality proposed to drawing on the characteristics of the studied network based on closeness centrality. Second, based on collected data, 136 dry ports in China and 127 seaports along the MSR have been used to construct an empirical network that covers 15 inland provinces of China. Then, the accessibility and importance of inland provinces are analyzed, and key points that serve the improvement of the logistics connectivity of inland provinces are mined and summarized. An example of an improved scheme for the connectivity of inland provinces is presented to demonstrate the application of these key points. The conclusions drawn support decision-making for local governments to improve the logistics connectivity of inland regions in the international logistics network, and then strengthen the participation of inland provinces in the MSR. 相似文献
296.
基于水文泥沙测验及遥感影像资料分析海南岛西南海域泥沙特征,采用不同沿岸输沙公式对比计算海域的波浪沿岸输沙量,采用多年实测地形数据研究岸滩的演变规律。结果表明:海域内含沙量大潮大于小潮,但总体上悬沙含量较低;研究海域内径流对输沙影响较为有限,但受沿岸波流输沙的影响相对较大;而海区的悬移质颗粒比较均匀,颗粒较细;沿岸段波浪沿岸输沙能力净输沙方向均为自南向北,年净输沙能力在6.72万~13.31万m~3;岸滩演变的主要动力是波浪、波生沿岸流和潮流共同作用导致东方市所辖岸线的变化总体以自然冲淤变化为主,但冲淤强度有限,变化幅度不大。 相似文献
297.
围填海工程在促进区域经济发展的同时会对周边海域滩槽形态、生态环境产生一定的影响。以通州湾港区起步工程为例,通过建立潮流数学模型,模拟南黄海辐射沙脊群海域的潮流形态。在此基础上,比较了两套不同围填海开发方案对工程区域滩面的冲淤影响。从整体上看,两套方案对工程周边海域的海底冲淤产生明显影响,但随着时间的推移趋于平衡。基于目前的模拟结果,先期实施离岸式的二港池更有利于维持小庙洪水道的畅通以及滩涂资源的保护。 相似文献
298.
299.
运用地主港模式进行滩涂资源开发利用研究与实践 总被引:4,自引:1,他引:3
对地主港模式的内涵及其在国内外实践情况进行了介绍,阐述了浙江港口建设实施地主港模式的现实要求。针对浙江省土地资源紧缺、经济亟需转型等现状,论述了地主港模式对滩涂资源开发的借鉴作用,从加强港区规划与围填、开展多元化融资开发滩涂、完善新建港区基础设施配套三方面指出了政府现阶段对地主港模式科学开发利用滩涂资源的重点。 相似文献
300.