全文获取类型
收费全文 | 3686篇 |
免费 | 273篇 |
专业分类
公路运输 | 618篇 |
综合类 | 1399篇 |
水路运输 | 671篇 |
铁路运输 | 718篇 |
综合运输 | 553篇 |
出版年
2024年 | 22篇 |
2023年 | 28篇 |
2022年 | 82篇 |
2021年 | 122篇 |
2020年 | 130篇 |
2019年 | 84篇 |
2018年 | 101篇 |
2017年 | 125篇 |
2016年 | 138篇 |
2015年 | 166篇 |
2014年 | 279篇 |
2013年 | 355篇 |
2012年 | 255篇 |
2011年 | 306篇 |
2010年 | 289篇 |
2009年 | 246篇 |
2008年 | 257篇 |
2007年 | 246篇 |
2006年 | 240篇 |
2005年 | 141篇 |
2004年 | 85篇 |
2003年 | 70篇 |
2002年 | 44篇 |
2001年 | 49篇 |
2000年 | 24篇 |
1999年 | 17篇 |
1998年 | 4篇 |
1997年 | 7篇 |
1996年 | 9篇 |
1995年 | 6篇 |
1994年 | 5篇 |
1993年 | 8篇 |
1992年 | 7篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1986年 | 1篇 |
排序方式: 共有3959条查询结果,搜索用时 0 毫秒
51.
52.
53.
城市郊区列车与轨道交通区域快线 总被引:1,自引:0,他引:1
通过介绍国外城市郊区列车与城市轨道交通区域快线的发展概况,分析我国城市郊区列车与城市轨道交通区域快线的特点、存在的问题,提出我国发展城市轨道交通的建议。 相似文献
54.
55.
56.
构建由 1个海洋航运商和 2个无车承运人组成的上下游的合作与竞争关系,2个无车承运人有不同的市场地位.通过斯坦伯格博弈研究发现,航运商负责货源或处于领导地位的无车承运人负责货源会影响各方的均衡利润及渠道结构.分析比较了海洋航运商的整合策略和利润共享策略.结果表明,在网络外部性和无车承运人提供差异性服务时,纳什均衡是航运商负责货源且上下游整合或利润分享. 相似文献
57.
道路运输车辆达标车型的实施,有效提升了道路运输车辆的安全性能。文章主要从电子稳定性控制系统、车道偏离预警系统、前向碰撞预警系统、自动紧急制动系统四个整车主动安全测试项目对道路运输车辆达标车型相应标准进行介绍,为道路运输车辆达标车型相关从业人员提供了主动安全整车项目试验参考。 相似文献
58.
59.
In this paper, we empirically test the viability of a flow-based approach as an alternative to transport accessibility measurement. To track where commuters travel from and to (but not commute times), we use transactional smartcard data from residents in Singapore to construct the (daily) spatial network of trips generated. We use the Place Rank method to demonstrate the viability of the flow-based approach to study accessibility. We compute the Place Rank of each of 44 planning areas in Singapore. Interestingly, even though the spatial network is constructed using only origin–destination information, we find that the travel time of the trips out of each planning area generally decreases as the area’s Place Rank increases. The same is also the case for in-vehicle time, number of transfers in the network and transfer time. This shows that a flow-based approach can be used to measure the notion of accessibility, which is traditionally assessed using travel time information in the system. We also compare Place Rank with other indicators, namely, bus stop density, eigenvector centrality, clustering coefficient and typographical coefficient to evaluate an area’s accessibility. The results show that these indicators are not as effective as the Place Rank method. 相似文献
60.
Achieving transport modal split targets at intermodal freight hubs using a model predictive approach
The increase of international freight commerce is creating pressure on the existing transport network. Cooperation between the different transport parties (e.g., terminal managers, forwarders and transport providers) is required to increase the network throughput using the same infrastructure. The intermodal hubs are locations where cargo is stored and can switch transport modality while approaching the final destination. Decisions regarding cargo assignment are based on cargo properties. Cargo properties can be fixed (e.g., destination, volume, weight) or time varying (remaining time until due time or goods expiration date). The intermodal hub manager, with access to certain cargo information, can promote cooperation with and among different transport providers that pick up and deliver cargo at the hub. In this paper, cargo evolution at intermodal hubs is modeled based on a mass balance, taking into account hub cargo inflows and outflows, plus an update of the remaining time until cargo due time. Using this model, written in a state-space representation, we propose a model predictive approach to address the Modal Split Aware – Cargo Assignment Problem (MSA–CAP). The MSA–CAP concerns the cargo assignment to the available transport capacity such that the final destination can be reached on time while taking into consideration the transport modality used. The model predictive approach can anticipate cargo peaks at the hub and assigns cargo in advance, following a push of cargo towards the final destination approach. Through the addition of a modal split constraint it is possible to guide the daily cargo assignment to achieve a transport modal split target over a defined period of time. Numerical experiments illustrate the validity of these statements. 相似文献