全文获取类型
收费全文 | 2682篇 |
免费 | 19篇 |
专业分类
公路运输 | 864篇 |
综合类 | 92篇 |
水路运输 | 865篇 |
铁路运输 | 82篇 |
综合运输 | 798篇 |
出版年
2023年 | 17篇 |
2022年 | 56篇 |
2021年 | 25篇 |
2020年 | 26篇 |
2019年 | 30篇 |
2018年 | 93篇 |
2017年 | 60篇 |
2016年 | 101篇 |
2015年 | 25篇 |
2014年 | 98篇 |
2013年 | 421篇 |
2012年 | 122篇 |
2011年 | 137篇 |
2010年 | 131篇 |
2009年 | 138篇 |
2008年 | 138篇 |
2007年 | 65篇 |
2006年 | 43篇 |
2005年 | 49篇 |
2004年 | 44篇 |
2003年 | 41篇 |
2002年 | 40篇 |
2001年 | 30篇 |
2000年 | 47篇 |
1999年 | 28篇 |
1998年 | 48篇 |
1997年 | 43篇 |
1996年 | 41篇 |
1995年 | 55篇 |
1994年 | 25篇 |
1993年 | 24篇 |
1992年 | 25篇 |
1991年 | 20篇 |
1990年 | 23篇 |
1989年 | 19篇 |
1988年 | 20篇 |
1987年 | 21篇 |
1986年 | 17篇 |
1985年 | 23篇 |
1984年 | 26篇 |
1983年 | 23篇 |
1982年 | 26篇 |
1981年 | 39篇 |
1980年 | 26篇 |
1979年 | 43篇 |
1978年 | 13篇 |
1977年 | 30篇 |
1976年 | 16篇 |
1975年 | 18篇 |
1974年 | 17篇 |
排序方式: 共有2701条查询结果,搜索用时 15 毫秒
881.
Robust public transport networks are important, since disruptions decrease the public transport accessibility of areas. Despite this importance, the full passenger impacts of public transport network vulnerability have not yet been considered in science and practice. We have developed a methodology to identify the most vulnerable links in the total, multi-level public transport network and to quantify the societal costs of link vulnerability for these identified links. Contrary to traditional single-level network approaches, we consider the integrated, total multi-level PT network in the identification and quantification of link vulnerability, including PT services on other network levels which remain available once a disturbance occurs. We also incorporate both exposure to large, non-recurrent disturbances and the impacts of these disturbances explicitly when identifying and quantifying link vulnerability. This results in complete and realistic insights into the negative accessibility impacts of disturbances. Our methodology is applied to a case study in the Netherlands, using a dataset containing 2.5 years of disturbance information. Our results show that especially crowded links of the light rail/metro network are vulnerable, due to the combination of relatively high disruption exposure and relatively high passenger flows. The proposed methodology allows quantification of robustness benefits of measures, in addition to the costs of these measures. Showing the value of robustness, our work can support and rationalize the decision-making process of public transport operators and authorities regarding the implementation of robustness measures. 相似文献
882.
Jonathan Levine Moira Zellner María Arquero de Alarcón Yoram Shiftan Dean Massey 《运输规划与技术》2018,41(5):463-480
This article reports on an integrated modeling exercise, conducted on behalf of the US Federal Highway Administration, on the potential for frequent automated transit shuttles (‘community transit’), in conjunction with improvements to the walking and cycling environment, to overcome the last-mile problem of regional rail transit and thereby divert travelers away from car use. A set of interlocking investigations was undertaken, including development of urban visualizations, distribution of a home-based survey supporting a stated-preference model of mode choice, development of an agent-based model, and alignment of the mode-choice and agent-based models. The investigations were designed to produce best-case estimates of the impact of community transit and ancillary improvements in reducing car use. The models in combination suggested significant potential to divert drivers, especially in areas that were relatively transit-poor to begin with. 相似文献
883.
Norbert E. Ligterink Lóránt A. Tavasszy Ronald de Lange 《Transportation Research Part D: Transport and Environment》2012,17(6):487-491
The paper develops a forecasting model of emissions from traffic flows embracing the dynamics of driving behavior due to variations in payload. To measure of emissions at the level of individual vehicles under varying payloads a portable emission measurement system is used. This paper reports on a model based on data at the level of individual vehicles for a representative road trajectory. The model aggregates the data to the level of a homogeneous flow dependent of velocity and specific power, which is dependent on payload weight. We find a lean specification for the model that provides emission factors for CO2, NOx, HC, CO, and NO2. The results indicate that, in comparison with earlier models, NOx emissions in particular tend to be underestimated. 相似文献
884.
Eric A. Morris Michael J. Smart 《Transportation Research Part D: Transport and Environment》2012,17(1):78-85
We explore whether experts’ perceptions of risk differ systematically from those of the public. To do so, we examine whether experts and non-experts make different location decisions in response to ground-level ozone pollution, one of the byproducts of motorized transportation. Physicians are experts in the field of health, and thus may differ from their lay neighbors in their knowledge of and attitude toward pollution and its health risks. If so, it is possible that they value locations with cleaner air differently than their neighbors do. Here we use hedonic price models based on willingness to bear housing and commute burdens to examine the differential valuation of clean air by doctors and laypeople in the Los Angeles region between 1980 and 2000. We find no evidence that doctors are more or less more willing than comparable lay residents to trade off time or money to live in cleaner-air neighborhoods. 相似文献
885.
Sergejs Gubins Erik T. Verhoef Thomas de Graaff 《Transportation Research Part A: Policy and Practice》2012,46(8):1304-1317
This paper models strategic interactions between a road supplier, a provider of traffic information, and road users, with stochastic travel times. Using a game-theoretical analysis of suppliers’ pricing strategies, we assess the social welfare effects of traffic information under various ownership regimes. The results show that the distortive welfare effect of monopolistic information pricing appears relatively small. Collusion of the road operator and information provider yields higher social welfare than independent pricing by two firms. The intuition behind this result resembles that behind the welfare effects of double marginalization, but is not exactly the same, as traffic information is not strictly complementary to road use. 相似文献
886.
Kirrilly Thompson Naomi Offler Lily Hirsch Danielle Every Matthew J. Thomas Drew Dawson 《Transportation Research Part A: Policy and Practice》2012,46(8):1280-1290
The execution of vandalism and graffiti on rail property has a significant impact on rail authorities, the patronisation of rail services, expenditure, and the timely operation of services. There are also important social costs which stem from passengers feeling unsafe, not to mention the environmental costs of removing graffiti and repairing vandalism. In this review paper, we focus on the social, non-technical determinants of and deterrents to vandalism and graffiti in the rail industry. First, we consider the definitions of graffiti and vandalism that are often conflated. After providing some clarification on terminology, and proposing a media-centred approach to vandalism and graffiti, we consider various theorisations of the psychosocial determinants of vandalism and graffiti behaviour. We then turn to an empirical discussion of different technical and social, non-technical prevention programmes that have been trialled. With a focus on identifying what works and under what circumstances, we refer to international case studies of successful vandalism reduction initiatives from Europe, the United Kingdom, the United States of America and Australia. Based on a review of literature and practice, we outline a future research agenda to address vandalism and graffiti. We recommend lines of further research covering: theory, empirical data collection and practical initiatives. Specifically, we note the need for a trans-theoretical model of vandalism and graffiti, further ethnographic research and improved evaluation and benchmarking strategies. This is the first review dedicated to the topic of vandalism and graffiti in the rail industry and the first review of non-technical, social deterrents to vandalism and graffiti broadly. 相似文献
887.
Transportation - Public–private partnership (PPP) has been well acknowledged by many as an innovative approach to the procurement of public projects. In their long-term concession periods,... 相似文献
888.
Santos António Dinis F. Valério Duarte Tenreiro Machado J. A. Lopes António M. 《Transportation》2019,46(5):1893-1913
Transportation - Urban growth originates multiscale spatial patterns, such as those of transportation networks. Here, the public transportation network (PTN) of the city of Lisbon is analysed from... 相似文献
889.
Transportation - This paper presents estimation results for models of transport chain and shipment size choice, as well as an implementation of the estimated disaggregate models (for two commodity... 相似文献
890.