全文获取类型
收费全文 | 778篇 |
免费 | 7篇 |
专业分类
公路运输 | 345篇 |
综合类 | 17篇 |
水路运输 | 215篇 |
铁路运输 | 8篇 |
综合运输 | 200篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 2篇 |
2019年 | 9篇 |
2018年 | 31篇 |
2017年 | 48篇 |
2016年 | 32篇 |
2015年 | 12篇 |
2014年 | 42篇 |
2013年 | 115篇 |
2012年 | 42篇 |
2011年 | 52篇 |
2010年 | 55篇 |
2009年 | 73篇 |
2008年 | 60篇 |
2007年 | 27篇 |
2006年 | 21篇 |
2005年 | 13篇 |
2004年 | 11篇 |
2003年 | 13篇 |
2002年 | 10篇 |
2001年 | 4篇 |
2000年 | 9篇 |
1999年 | 8篇 |
1998年 | 6篇 |
1997年 | 8篇 |
1996年 | 9篇 |
1995年 | 10篇 |
1994年 | 1篇 |
1993年 | 7篇 |
1992年 | 4篇 |
1991年 | 5篇 |
1990年 | 2篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 7篇 |
1975年 | 4篇 |
1974年 | 1篇 |
1973年 | 5篇 |
1972年 | 1篇 |
排序方式: 共有785条查询结果,搜索用时 31 毫秒
711.
It is argued that an understanding of variability is central to the modelling of travel behaviour and the assessment of policy impacts, and is not the peripheral issue that it has often been considered. Drawing on recent studies in the UK and Australia, in conjunction with a review of the literature, the paper first examines the policy and analytical rationale for using multi-day data, then illustrates different ways of measuring variability, and finally discusses issues relating to the collection of suitable data for such analyses. In a policy context, there is a growing need for multi-day data to examine issues that affect general rather than one-day behaviour (e.g. to assess the distribution of user charges for road pricing, or patterns of public transport usage); while analytically, multi-day data is needed to improve our ability to identify the mechanisms behind travel behaviour and to derive better empirical relationships. Three measures of variability are presented: a graphical form showing daily differences in behaviour at the individual level; an aggregate, similarity index; and a hybrid graphical/numerical measure, which provides new insights into variability in daily patterns of behaviour. The paper raises a number of issues for debate, probably the most crucial of which is: variability in what? The way in which behaviour is measured crucially affects our conception of stability and variability. 相似文献
712.
秦金 《西安交通大学学报(英文版)》1995,(1)
THESTUDYOFTHECHANGESANDMECHANISMOFHINDQUARTERVASCULARRESISTANCEINRATSWITHMYOCARDIALINFARCTIONQinJin(秦金);PeterFinn(Departmento... 相似文献
713.
Peter B. Marlow 《Maritime Policy and Management》1991,18(2):123-138
Governments may often try to stimulate investment in their own country by altering the climate in which such decisions are made. They achieve this by means of fiscal and financial regimes which may offer investment incentives for particular forms of investment and/or favourable financial arrangements to facilitate the purchase of particular assets. This paper discusses the form which such incentives might take and considers the literature to examine how such incentives have been perceived by businessmen whose actions they are intended to influence. 相似文献
714.
This paper describes a study into the effects of pre-trip information on travel behaviour, carried out as part of the DRIVE project EURONETT. The aim of the study was to investigate travellers' requirements for different types of travel information and methods of enquiry and to relate the process of information acquisition to changes in travel behaviour. The study was carried out using a stated preference approach, built on the use of a microcomputer based simulation of an in-home pre-trip information system offering information on travel times from home to City Centre, by bus and car, at different times of the day. A novel feature of the stated preference exercise was that respondents effectively generated their own choice set of alternatives through the process of information acquisition. Surveys were undertaken in parallel in Birmingham and Athens, thus allowing a comparison to be made between behaviour in typical Southern and Northern European settings.The first part of the paper discusses some of the fundamental behavioural and modelling issues raised by the introduction of advanced traveller information systems. It then describes the study methodology and the stated preference experiment. Results are presented from an analysis of the information acquisition process itself and from choice models relating the acquired information to effects on different dimensions of travel behaviour. 相似文献
715.
This paper asserts the continuing need for a long-range component to urban transportation planning, citing particularly the relationships between short- and long-range planning and the dangers of a single-minded concentration on short-range planning. However, the nature of the long-range planning procedure that is required is substantively different from that of most extant approaches. Some of the specific requirements and capabilities of a new procedure are described, and existing procedures are compared against these.In the latter part of the paper, some of the elements of a new long-range planning procedure are characterized. It is suggested that the procedure be built around a scenario approach to confronting and bounding future uncertainty. Second, the need to incor porate financial forecasting in the process is laid out and related to the scenario concept. Third, the need for travel- and impact-forecasting procedures is recognized and a set of input, output and operating requirements for such procedures are specified. It is suggested that improved sketch-planning tools may fit the requirements to a large extent. It is also suggested that some procedures or models in the process should be synthetic models, not needing calibration for each new application. Finally, a number of requirements are specified for the display and evaluation of planning proposals from this procedure. A major emphasis is placed here on transparency of the process and responsiveness to direct intervention by the decision-maker. 相似文献
716.
S.-J. Lee M.-S. Jang Y.-G. Kim G.-T. Park 《International Journal of Automotive Technology》2011,12(3):425-432
Occupant classification in a passenger seat is one of the critical components for any advanced airbag system. Many automotive
electronic suppliers and engineers predict that the camera will be the next generation sensor for active and passive safety
systems because it has several advantages compared to other sensors. The present paper describes a stereovision-based occupant
classification system (OCS) and intelligent algorithm with embedded system by which triggering of the airbag deployment can
be controlled. The system consists of a pair of stereo cameras and dual Digital Signal Processor (DSP): the first DSP is for
the stereo matching processing, and the second is for occupant classification. The results show that the reaches 97%, and
the processing time is 960 ms. Such performance indicates that the feasibility of the system as an embedded OCS is high. 相似文献
717.
Peter Grenell 《Coastal management》2013,41(1):13-20
Abstract This paper examines the activities of the California State Coastal Conservancy. It will examine the agency's procedures and identify those factors critical to its success. Finally, suggestions for improvements in its operations are given. 相似文献
718.
719.
Jungwoo Shin Junhee Hong Gicheol Jeong Jongsu Lee 《Transportation Research Part D: Transport and Environment》2012,17(2):138-144
This study investigates how the introduction of electric vehicles may influence the usage of existing cars. A survey of 250 households in South Korea is used to analyze a future automobile market that includes electric vehicles taking into account the heterogeneity of consumer preferences and usage patterns. Based on consumer preferences, the future market share of various vehicles is estimated and the impact of promoting the usage of electric vehicles by government subsidization and tax incentives is analyzed. 相似文献
720.