全文获取类型
收费全文 | 3326篇 |
免费 | 158篇 |
专业分类
公路运输 | 535篇 |
综合类 | 1323篇 |
水路运输 | 494篇 |
铁路运输 | 548篇 |
综合运输 | 584篇 |
出版年
2024年 | 4篇 |
2023年 | 11篇 |
2022年 | 34篇 |
2021年 | 75篇 |
2020年 | 109篇 |
2019年 | 67篇 |
2018年 | 97篇 |
2017年 | 79篇 |
2016年 | 132篇 |
2015年 | 155篇 |
2014年 | 285篇 |
2013年 | 332篇 |
2012年 | 225篇 |
2011年 | 270篇 |
2010年 | 254篇 |
2009年 | 222篇 |
2008年 | 223篇 |
2007年 | 234篇 |
2006年 | 212篇 |
2005年 | 112篇 |
2004年 | 86篇 |
2003年 | 72篇 |
2002年 | 46篇 |
2001年 | 47篇 |
2000年 | 21篇 |
1999年 | 10篇 |
1998年 | 7篇 |
1997年 | 10篇 |
1996年 | 10篇 |
1995年 | 6篇 |
1994年 | 7篇 |
1993年 | 13篇 |
1992年 | 5篇 |
1991年 | 2篇 |
1990年 | 5篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1986年 | 1篇 |
排序方式: 共有3484条查询结果,搜索用时 406 毫秒
91.
92.
93.
Breakthrough innovations, whether technological, organizational or both, are a necessity if the market share of intermodal freight transport is to expand. The main growth potential lies in the markets for flows over short distances, for perishable and high-value commodities, for small consignments, and for flows that demand speed, reliability and flexibility. It will take radical innovations to produce a breakthrough in the modal split and allow these new markets to be conquered. This special issue is based on papers presented at an international conference on freight transport automation and multimodality, held in Delft in May 2002, that are illustrative of the direction of breakthrough research and development (R&D) aimed at increasing the market share for intermodal transport. 相似文献
94.
This paper includes discussions on rail in urban areas and railway history. More specifically commonly used terms and definitions for rail services, policy and practice in urban areas are discussed followed by an overview of railway developments around the world. 相似文献
95.
基于各种运输方式的技术经济特征和交通运输业可持续发展理念,借助于耗散结构理论,研究综合运输通道是一个具有耗散结构特性的开放系统。通过对综合运输通道结构的分析,实现综合运输通道内各种运输方式的协调发展,合理竞争;满足人们出行与货运需求;不断完善和提高各种运输方式适应环境的能力,实现通道内外的和谐可持续发展。 相似文献
96.
近年来,高速公路客运随着高速公路的快速增长而迅速发展,其拥有安全、快捷、舒适、优质服务等特点,但也面临着客运站建设落后、运力结构不合理、运力与运量不平衡等问题,研究高速公路客运的发展措施对于指导实际工作有一定的意义。 相似文献
97.
John H. Mott 《先进运输杂志》2013,47(5):498-511
A method for modeling air carrier departure delays at commercial‐service airports as autoregressive random processes is presented. This method employs the correlation of a priori demand data to significantly reduce prediction error in the optimal least‐squares estimator for additive white noise. The reduction factor of the prediction error is demonstrated to be on the order of 102 over that of the unbiased estimator. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
98.
The evacuation operations problem aims to avoid or mitigate the potential loss of life in a region threatened or affected by a disaster. It is shaped to a large extent by the evolution of evacuation traffic resulting from the demand–supply interactions of the associated transportation network. Information-based control is a strategic tool for evacuation traffic operations as it can enable greater access to the affected population and more effective response. However, comparatively few studies have focused on the implementation of information-based control in evacuation operations. This study develops a control module for evacuation operations centered on addressing the demand–supply interactions by using behavior-consistent information strategies. These strategies incorporate the likely responses of evacuees to the information provided in the determination of route guidance information. The control module works as an iterative computational process involving an evacuee route choice model and a control model of information strategies to determine the route guidance information to direct evacuation traffic so as to approach a desired network traffic flow pattern. The problem is formulated as a fuzzy logic based optimization framework to explicitly incorporate practical concerns related to information dissemination characteristics and social equity in evacuation operations. Numerical experiments highlight the importance of accounting for the demand–supply interactions, as the use of behavior-consistent information strategies can lead evacuee route choices to approach the operator-desired proportions corresponding to the desired traffic pattern. The results also indicate that while a behavior-consistent information strategy can be effective, gaps with the desired route proportions can exist due to the discrete nature of the linguistic messages and the real-world difficulty in accurately modeling evacuees’ actual route choice behavior. 相似文献
99.
The present paper deals with timetable optimisation from the perspective of minimising the waiting time experienced by passengers when transferring either to or from a bus. Due to its inherent complexity, this bi-level minimisation problem is extremely difficult to solve mathematically, since timetable optimisation is a non-linear non-convex mixed integer problem, with passenger flows defined by the route choice model, whereas the route choice model is a non-linear non-continuous mapping of the timetable. Therefore, a heuristic solution approach is developed in this paper, based on the idea of varying and optimising the offset of the bus lines. Varying the offset for a bus line impacts the waiting time passengers experience at any transfer stop on the bus line.In the bi-level timetable optimisation problem, the lower level is a transit assignment calculation yielding passengers’ route choice. This is used as weight when minimising waiting time by applying a Tabu Search algorithm to adapt the offset values for bus lines. The updated timetable then serves as input in the following transit assignment calculation. The process continues until convergence.The heuristic solution approach was applied on the large-scale public transport network in Denmark. The timetable optimisation approach yielded a yearly reduction in weighted waiting time equivalent to approximately 45 million Danish kroner (9 million USD). 相似文献
100.
C. O. Ikporukpo 《运输规划与技术》2013,36(3-4):181-188
In spite of the fact that about 70% of Nigeria's population live in rural areas, these areas have remained largely inaccessible. Not only do they lack motorable roads and organized public transport but also field surveys indicate that nearly all rural inhabitants do not have a private car. A Directorate of Food, Roads and Rural Infrastructure has been set up to manage the inaccessibility problem, among others. Whereas there are several conventional approaches to the management of the rural transportation problem, the Nigerian approach relies on the provision of roads. This restrictive approach with an emphasis on locational to the neglect of personal accessibility has various limitations which are analysed. 相似文献