全文获取类型
收费全文 | 425篇 |
免费 | 9篇 |
专业分类
公路运输 | 45篇 |
综合类 | 12篇 |
水路运输 | 118篇 |
铁路运输 | 8篇 |
综合运输 | 251篇 |
出版年
2022年 | 2篇 |
2021年 | 7篇 |
2020年 | 7篇 |
2019年 | 5篇 |
2018年 | 13篇 |
2017年 | 9篇 |
2016年 | 12篇 |
2014年 | 15篇 |
2013年 | 95篇 |
2012年 | 18篇 |
2011年 | 24篇 |
2010年 | 23篇 |
2009年 | 23篇 |
2008年 | 19篇 |
2007年 | 15篇 |
2006年 | 16篇 |
2005年 | 7篇 |
2003年 | 9篇 |
2002年 | 2篇 |
2001年 | 6篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 8篇 |
1997年 | 5篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1988年 | 1篇 |
1987年 | 5篇 |
1986年 | 1篇 |
1985年 | 7篇 |
1984年 | 5篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1980年 | 5篇 |
1979年 | 5篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1975年 | 6篇 |
1974年 | 3篇 |
1973年 | 1篇 |
1972年 | 2篇 |
排序方式: 共有434条查询结果,搜索用时 312 毫秒
421.
Paratransit services bridge the gap between static fixed route transit and the flexible automobile travel. Paratransit services provide personalized public trapsportation by responding to the needs of individual markets and users. Unfortunately, fragmentation of the paratransit sector and institutional and regulatory constraints have prevented or complicated realization of paratransit's full potential. The orientation in this paper is not primarily to identify promising paratransit applications. Rather, it is to examine basic characteristics of paratransit services, fundamental issues unique to paratransit, existing problems that are constraining paratransit development, and ways to overcome or minimize existing difficulties. A taxonomy of paratransit services is proposed so that these systems can be better related to each other. The institutional environment of paratransit is examined from the viewpoints of planning, operations and regulation. A primary focus is on integration of various paratransit services and of paratransit and conventional fixed route services. Several proposals are made relating to improvements in existing services, new service concepts, new institutional arrangements and service integration. 相似文献
422.
David B. Szplett 《先进运输杂志》1984,18(3):245-257
The approximate analytical models of public transit systems are reviewed. First, the derivation and formation of the standard model form is presented. Once the model is explained in general terms some practical planning applications are considered and evaluated. The model type presents an invaluable tool to the transit planner but a few operational problems need to be considered. Further benefits to the planning professionals would be realized if researchers were to devote more effort to sensitivity analysis as a means of determining which system parameters have the greatest impact upon the operation of the transit system. 相似文献
423.
424.
David Kahn André De Palma Jean Louis Deneubourg 《Transportation Research Part B: Methodological》1985,19(2):143-153
Mode choice under stochastically varying demand is studied via a dynamic mathematical model which describes the behavioural interactions between population groups. The model is developed by assuming competing attractivity functions for automobile and public transit which motivate their use subject to an overall demand for transportation. When this demand is allowed to vary stochastically, a set of stochastic differential equations describing the model are obtained. These are solved for their steady-state values. It is found that noisy demand can structure the system qualitatively differently than when the demand is fixed. The noise is found to generally reduce the level of public transit ridership, but it also changes the values of the threshold at which new regimes occur and, most interestingly, it induces new steady-state solutions for ridership at critical values of the variance of demand. In the latter case, noise becomes a source of new possibilities in the system by triggering a steady-state solution not present in the noise-free environment. 相似文献
425.
David A. Hensher 《Transportation Research Part B: Methodological》1981,15(6):407-410
When a “new” alternative is introduced, post-estimation, into a logit model, analysis initially exclude an ASC or occasionally assume a correspondence with an existing alternative. Using a recent data set for mode and route choice, the paper highlights the forecasting implications of ignoring the ASC in the utility expression of a “new” alternative, and how sensitive the market shares are to the inclusion/ exclusion of the ASC. 相似文献
426.
In this paper, a method for designing a statistically valid sample of bridges is proposed. The need for such a sampling procedure arises from the impracticality of a detailed analysis of the structural effects of new candidate truck configurations on the whole bridge inventory. In this study, a set of bridges from the national inventory was determined for the purpose of selecting a bridge sample. This set of bridges is referred to as the population. The selection of bridges for inclusion in the population was based on the status of the bridge, type of service, structural material, structural system type and functional class. The stratified sampling method was used in the determination of the required sample sizes. According to this method, the population was first divided into sub-populations, or strata. These sub-populations were non-overlapping. In turn, each strata was divided into sub-strata. The characteristics of each sub-stratum were estimated and combined to determine the characterics of the strata. Then the characteristics of the strata were combined to determine the characteristics of the bridge population. A comparison of the results based on the sample and bridge population was conducted in order to verify the validity of the proposed sampling procedure. 相似文献
427.
David Bayliss 《Transportation》1981,10(4):311-343
Preface This paper is an adaptation of the first Reuben Smeed Memorial Lecture given at University College London on 12 March. This series of lectures has been promoted by the late Reuben Smeed's former friends, colleagues and admirers as a tribute to him for his contributions to traffic science and engineering over a quarter of a century. Reuben Smeed's unique combination of imagination, rigorous objectivity and determination, coupled with his humour and warmth brought him rare distinction as a researcher and teacher. The subject of the paper is wide ranging and complex and it has not been possible to treat all parts of it with the thoroughness that Reuben Smeed would have sought. However there is little doubt that it would have appealed to him as one well worth tackling. 相似文献
428.
This paper proposes an alternative approach to understanding travel behaviour —the study of behavioural intentions. The communality of this and the revealed behaviour approach are outlined and the use of controlled experimental methods illustrated in an analysis of empirical data on behavioural intentions of citizens with respect to changes in the levels of transport service, and the introduction of an area licensing scheme for travel in a central city area in Australia.This research was completed while Jordan Louviere was at Cambridge Systematics Inc., Boston, Massachusetts, U.S.A. 相似文献
429.
Coordinated development of aviation facilities and services is critical for geographically remote communities. Improvements in aviation capability can be assisted by an analytical base for determining the implications of alternative configurations of air services in terms of links to be served, airport/aerodrome investment, type of flight equipment and flight frequency. We outline a method for identifying airport supply configurations to meet air service demand to and from the Pilbara region of north-west Australia. The approach emphasises minimum levels of demand required from a community in order to justify provision of air services of a given scenario. The method is influenced by the paucity of data on demand in remote communities, and the consequent risk of relying solely on demand-side forecasts of patronage levels. It is therefore particularly useful in assessing transport systems associated with remote resource development projects which are notable for the rapidity of change which they can bring. The approach has relevance to a wide range of transport applications. 相似文献
430.
David Briginshaw 《轨道交通》2007,(5):74-74
泰国曼谷市开始建设一条新线连接市中心和苏汪纳普机场,该工程总投资为250亿泰铢(6.75亿美元),预计2007年10月开通。 相似文献