全文获取类型
收费全文 | 2576篇 |
免费 | 119篇 |
专业分类
公路运输 | 407篇 |
综合类 | 992篇 |
水路运输 | 424篇 |
铁路运输 | 354篇 |
综合运输 | 518篇 |
出版年
2024年 | 10篇 |
2023年 | 7篇 |
2022年 | 25篇 |
2021年 | 56篇 |
2020年 | 81篇 |
2019年 | 50篇 |
2018年 | 77篇 |
2017年 | 69篇 |
2016年 | 101篇 |
2015年 | 121篇 |
2014年 | 208篇 |
2013年 | 271篇 |
2012年 | 174篇 |
2011年 | 216篇 |
2010年 | 207篇 |
2009年 | 165篇 |
2008年 | 179篇 |
2007年 | 167篇 |
2006年 | 160篇 |
2005年 | 88篇 |
2004年 | 64篇 |
2003年 | 55篇 |
2002年 | 34篇 |
2001年 | 38篇 |
2000年 | 15篇 |
1999年 | 7篇 |
1998年 | 4篇 |
1997年 | 7篇 |
1996年 | 7篇 |
1995年 | 5篇 |
1994年 | 5篇 |
1993年 | 8篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1986年 | 1篇 |
排序方式: 共有2695条查询结果,搜索用时 515 毫秒
711.
为了揭示内河航运发展与区域经济增长之间的关系以及二者的作用机制,以重庆市"内河运输-区域经济"复合系统1985-2009年的数据为研究对象,建立了基于协整理论的自回归分布滞后模型和vAR模型,并进行了脉冲响应分析.研究结果表明,内河航运发展与区域经济增长之间存在单向的因果关系,内河航运的发展对区域经济增长具有较强的拉动作用,并且这种作用力度长期明显强于短期.区域经济的增长不能自发带动内河航运的发展,甚至对内河航运发展具有抑制效应.最后根据实证分析结论,给出了相应的政策建议. 相似文献
712.
713.
在考虑人的心理需求的前提下,对客运综合枢纽候车空间以及站前广场的人均使用面积新的推算,并得出了新的计算值。在分析客运综合枢纽功能区布设一般方法的基础上,给出了主要功能区布设的推荐方法;并对客运综合枢纽客流聚集空间以及信息诱导设施的人性化设计要点进行研究。提出使用基于AHP与DEA综合赋权的层次分析法对客运综合枢纽功能区布设与人性化设计的合理性进行评价。 相似文献
714.
提高公共交通规划管理及信息化水平,需要制定科学的公交规划管理策略,公交客流分配是公交规划与管理的核心内容之一。为促进公交配流理论研究,提高公交客流分配结果科学性,分析了国内外公交配流研究现状,对于城市广义公交网络,结合公交时刻表,定义了公交连接、连接片段以及吸引连接集合,建立了容量限制下基于时刻表的公交网络随机用户均衡配流算法(VRT-SUE),对算法原理和求解步骤进行了探讨。构建实例公交网络进行分析测试,配流结果显示该模型能够很好的反映出出发时间、到达时间、换乘次数及费用等对乘客公交出行的影响,算法是合理和有效的。 相似文献
715.
716.
Stef Proost Fay DunkerleyBruno De Borger Astrid GühnemanPia Koskenoja Peter MackieSaskia Van der Loo 《Transportation Research Part A: Policy and Practice》2011,45(3):161-170
The trans-European transport network (TEN-T) encompasses the major planned transport infrastructure in Europe, ranging from high speed rail to port infrastructure. Projects in this category are considered priority projects and receive European subsidies; but these have been insufficient to get these projects off the ground. This paper addresses two research questions. First, it sketches the basic economics of cross-boundary infrastructure projects: what pricing and investment policies can we expect, what is the role of through traffic and high fixed costs of infrastructure? Second, it examines briefly what lessons the EU could draw from the experience of other existing federal funding institutions like the US and Germany. These ideas are used to propose a new subsidy scheme for the TEN-T projects. 相似文献
717.
Olaf Jonkeren Bart JourquinPiet Rietveld 《Transportation Research Part A: Policy and Practice》2011,45(10):1007-1019
Future climate change is expected to affect inland waterway transport in most main natural waterways in Europe. For the river Rhine it is expected that, in summer, more and longer periods with low water levels will occur. In periods of low water levels inland waterway vessels have to reduce their load factors and, as a result, transport prices per tonne will increase. One possible consequence of these higher transport prices is a deterioration of the competitive position of inland waterway transport compared with rail and road transport, and thus a change in modal split. We study this issue using a GIS-based software model called NODUS which provides a tool for the detailed analysis of freight transportation over extensive multimodal networks. We assess the effect of low water levels on the costs of transport operations for inland waterway transport in North West Europe under several climate scenarios. It turns out, that the effect on the modal split is limited. Under the most extreme climate scenario, inland waterway transport would lose about 5.4% of the quantity that is currently being transported annually in the part of the European inland waterway transport market considered. The very dry year of 2003 can be seen as an analogue for this scenario. 相似文献
718.
Javier Alonso Vicente Milanés Joshué Pérez Enrique Onieva Carlos González Teresa de Pedro 《Transportation Research Part C: Emerging Technologies》2011,19(6):1095-1110
This article presents a cooperative manoeuvre among three dual mode cars – vehicles equipped with sensors and actuators, and that can be driven either manually or autonomously. One vehicle is driven autonomously and the other two are driven manually. The main objective is to test two decision algorithms for priority conflict resolution at intersections so that a vehicle autonomously driven can take their own decision about crossing an intersection mingling with manually driven cars without the need for infrastructure modifications. To do this, the system needs the position, speeds, and turning intentions of the rest of the cars involved in the manoeuvre. This information is acquired via communications, but other methods are also viable, such as artificial vision. The idea of the experiments was to adjust the speed of the manually driven vehicles to force a situation where all three vehicles arrive at an intersection at the same time. 相似文献
719.
The shrinking of Arctic ice triggers off a new round of competition and dispute in this region, among traditional Arctic states and non-Arctic actors. Like its East Asia neighbours, China sees the melting Arctic Ocean a unique opportunity for itself and international trade generally. The changing physical landscape of the Arctic region will certainly have a major impact on China’s economic future which is very dependent on international shipping. This paper assesses the impact of the ice-free Arctic on the development of marine transport industry in China. The author discusses the potential new routes with the Arctic’s melting and the opportunities that it brings to China’s maritime transportation industry. Challenges that China faces in future shipping through the Arctic will be also addressed from political, legal, economic and environmental dimensions, followed by a preliminary exploration of ways to solution of these challenges. 相似文献
720.