全文获取类型
收费全文 | 2045篇 |
免费 | 17篇 |
专业分类
公路运输 | 623篇 |
综合类 | 82篇 |
水路运输 | 648篇 |
铁路运输 | 59篇 |
综合运输 | 650篇 |
出版年
2023年 | 14篇 |
2022年 | 41篇 |
2021年 | 18篇 |
2020年 | 15篇 |
2019年 | 21篇 |
2018年 | 61篇 |
2017年 | 56篇 |
2016年 | 95篇 |
2015年 | 33篇 |
2014年 | 80篇 |
2013年 | 308篇 |
2012年 | 106篇 |
2011年 | 116篇 |
2010年 | 95篇 |
2009年 | 116篇 |
2008年 | 96篇 |
2007年 | 73篇 |
2006年 | 51篇 |
2005年 | 42篇 |
2004年 | 31篇 |
2003年 | 33篇 |
2002年 | 31篇 |
2001年 | 29篇 |
2000年 | 34篇 |
1999年 | 33篇 |
1998年 | 26篇 |
1997年 | 34篇 |
1996年 | 30篇 |
1995年 | 49篇 |
1994年 | 11篇 |
1993年 | 25篇 |
1992年 | 19篇 |
1991年 | 20篇 |
1990年 | 12篇 |
1988年 | 11篇 |
1987年 | 11篇 |
1986年 | 10篇 |
1985年 | 15篇 |
1984年 | 13篇 |
1983年 | 13篇 |
1982年 | 7篇 |
1981年 | 12篇 |
1980年 | 16篇 |
1979年 | 19篇 |
1978年 | 16篇 |
1977年 | 14篇 |
1976年 | 9篇 |
1975年 | 14篇 |
1974年 | 11篇 |
1972年 | 7篇 |
排序方式: 共有2062条查询结果,搜索用时 15 毫秒
291.
R. M. Goodall W. Kortü m 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1983,12(4):225-257
Active control systems offer significant functional advantages over passive systems; their introduction into production-line vehicles, however, is cautious and slow. This survey describes the recent progress in the analysis, design and technology of active controls in vehicles. It includes the state-of-the-art of their introduction into operation as well as their future potential in view of recent advances in technology and computer aided design strategies. The survey has been limited to suspensions for vehicles on roads and tracks. 相似文献
292.
G. M. Owen 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1982,11(4):215-240
Agricultural tractors are relatively slow moving vehicles but a good steer response under all working conditions is generally required. This paper evaluates the effect of ground slope, axle load, ground speed, tyres and ground surface on yaw rate response to steer input. 相似文献
293.
M. A. Bakr 《Maritime Policy and Management》1978,5(2):133-140
This brief paper examines some of the problems of interpretation of documents and procedures given in English faced by non-English seafarers, and suggests the use of 'controlled' English to simplify these problems.
' Speak English ', said the Eaglet, ' I don't know the meaning of half those long words, and what's more, I don't believe you do either. '
Alice's Adventures in Wonderland
Lewis Carroll 相似文献
' Speak English ', said the Eaglet, ' I don't know the meaning of half those long words, and what's more, I don't believe you do either. '
Alice's Adventures in Wonderland
Lewis Carroll 相似文献
294.
295.
296.
297.
Non-Contact Suspension and Propulsion Technology 总被引:3,自引:0,他引:3
H. Alscher M. Iguchi A. R. Eastham I. Boldea 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1983,12(4):259-289
As a result of extensive research and development in several countries, the technologies of magnetic suspension and linear electric drives are becoming available for transportation applications. The successful demonstration and operation of prototype vehicles has established the technical viability of these systems. Several urban transit or shuttle services, with magnetic suspension and/or linear motor propulsion are likely to be operational within 3-4 years. After the final stages ofdevelopment and rigorous testing, high speed systems are likely to be an option for intercity implementation by the end of the decade. This paper presents a report on the worldwide status of R&D and test programs of non-contact suspension and propulsion technology for guided ground transport. 相似文献
298.
299.
Decentralization is a major theme of organizational change in shipping. It is often seen as 'putting power back aboard ship'. However, the authors argue that this view is too simple. Decentralization poses fundamental questions about the entire management structure of the shipping company. The redistribution of authority necessary for decentralization is discussed in terms of the company organization structure. 相似文献
300.