全文获取类型
收费全文 | 8057篇 |
免费 | 104篇 |
专业分类
公路运输 | 1842篇 |
综合类 | 592篇 |
水路运输 | 2542篇 |
铁路运输 | 768篇 |
综合运输 | 2417篇 |
出版年
2022年 | 112篇 |
2021年 | 60篇 |
2020年 | 46篇 |
2019年 | 82篇 |
2018年 | 194篇 |
2017年 | 114篇 |
2016年 | 166篇 |
2015年 | 92篇 |
2014年 | 242篇 |
2013年 | 1230篇 |
2012年 | 338篇 |
2011年 | 414篇 |
2010年 | 269篇 |
2009年 | 370篇 |
2008年 | 322篇 |
2007年 | 268篇 |
2006年 | 233篇 |
2005年 | 270篇 |
2004年 | 289篇 |
2003年 | 181篇 |
2002年 | 148篇 |
2001年 | 134篇 |
2000年 | 141篇 |
1999年 | 103篇 |
1998年 | 130篇 |
1997年 | 112篇 |
1996年 | 141篇 |
1995年 | 150篇 |
1994年 | 84篇 |
1993年 | 190篇 |
1992年 | 161篇 |
1991年 | 78篇 |
1990年 | 83篇 |
1989年 | 58篇 |
1988年 | 74篇 |
1987年 | 65篇 |
1986年 | 59篇 |
1985年 | 77篇 |
1984年 | 73篇 |
1983年 | 73篇 |
1982年 | 73篇 |
1981年 | 95篇 |
1980年 | 68篇 |
1979年 | 91篇 |
1978年 | 57篇 |
1977年 | 69篇 |
1976年 | 54篇 |
1975年 | 65篇 |
1974年 | 51篇 |
1973年 | 45篇 |
排序方式: 共有8161条查询结果,搜索用时 15 毫秒
921.
张兴容 《铁道劳动安全卫生与环保》1999,26(3):194-197
为减少火灾事故,介绍了“工厂火灾、爆炸场所危险度综合评价法”,“道氏法”是该法的基础。分析了“道氏法”的不足,而提出了固定危险和现实补偿的综合性计算方法。还通过实例记述了新方法的优点、基本原理和应用方法。该法能用于评价工厂企业危险设备、装置与场所的火灾、爆炸危险程度。 相似文献
922.
T.T. Chow Zhang Lin Wei Bai 《Transportation Research Part D: Transport and Environment》2006,11(6):447-458
The provision of mechanical ventilation in a semi-confined public transport interchange is mandatory in Hong Kong. The authority recommends the general use of low-level-supply and high-level-exhaust airflow schemes that different from the traditional ventilation concept in that low-level emitted vehicle pollutants are best removed at source. Analyses of air quality at typical public transport interchange environments are conducted for the two airflow schemes. The CFD simulations are generalized by studying light and heavy traffic conditions with adjusted ventilation rates to match the change in vehicle emission levels to examine pollutant concentrations at passenger waiting areas and the elevated footbridges. While the conventional high-level-supply and low-level-exhaust scheme could perform better during light traffic loads, the difference diminishes with increased traffic loads during peak hours. On the other hand, the high-level exhaust scheme has an advantage of serving as a smoke extraction system during a fire outbreak. 相似文献
923.
V.T. Tran 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1994,23(1):165-209
The theory of crosswind feedforward control was explained using the example of a vehicle with active front-wheel steering. Beforehand, the calculation formulas and frequency responses of the transient crosswind force and of the wind yaw moment acting on the vehicle were derived using the example of a simple vehicle fluid model. The influence of the transiency of crosswind disturbance on the dynamic crosswind behaviour of a vehicle was then presented. The results of simulation confirmed the analyses carried out in the frequency domain for feedforward control with front, rear and all-wheel steering. With front-wheel steering, the influence of crosswind on one of the vehicle movement variables (lateral acceleration or yaw rate) could be almost completely compensated by dynamic feedforward control. With rear-wheel steering, it is only possible to compensate directly for the influence on the yawing rate. Due to the setting of the side force in the same direction as the lateral wind force at the start, active rear-wheel steering is not so successful as active front-wheel steering. Nevertheless, the crosswind behaviour of a vehicle can be considerably enhanced by feedforward control with rear-wheel steering. The best crosswind behaviour was obtained with active all-wheel steering: the vehicle hardly responds at all to crosswinds and remains on course despite heavy gusts of wind. 相似文献
924.
Peter R. Stopher 《Transportation》1992,19(2):159-176
The paper describes the results of a pilot survey that used a one-day activity diary to collect origin-destination data, as opposed to a travel-based diary. The design of the diary is discussed, together with a comparison to a more conventional travel diary. The paper examines the extent to which the activity diary appears to have been capable of collecting good travel data that is at least comparable to travel diary efforts. In addition, a substantial portion of the paper is concerned with a comparison of the retrieval methods for the diaries. Two alternative methods were pilot-tested, one being the use of telephone retrieval and the other being mailback retrieval. Although the pilot test used small samples, the evidence appears to be strong that mailback is preferable to telephone retrieval, while telephone retrieval did not seem capable of providing some of the benefits often ascribed to it. 相似文献
925.
926.
927.
This paper introduces a new approach in timing the sale and purchase of ships in the tanker market and examines the performance of this trading strategy over the period January 1976 to September 2004. Based on the long-run cointegration relationship between earnings and price, we establish a trading model which can be used as an indicator of investment or divestment timing decisions. We also perform statistical tests using the bootstrap approach in order to discount the possibility of data snooping biases and test the robustness of our trading models. Our results indicate that trading strategies based on earning-price ratios significantly out-perform buy and hold strategies in the tanker market. 相似文献
928.
929.
930.
C. Jotin Khisty 《Maritime Policy and Management》1996,23(3):261-270
The vessel-carrying capacity of the Chicago River, Illinois, is restricted by a lock. separating the river from Lake Michigan. Currently, vessels passing through the lock experience long delays during summer months. An investigation and analysis of this system determined that although the system is now generally operating below capacity, the peak periods during summer weekends do approach capacity, and the situation is likely to deteriorate in the future. In addition, the river and lock have safety and traffic conflict problems that need attention. Recommendations to mitigate these problems are described. 相似文献