全文获取类型
收费全文 | 8305篇 |
免费 | 104篇 |
专业分类
公路运输 | 1961篇 |
综合类 | 601篇 |
水路运输 | 2584篇 |
铁路运输 | 775篇 |
综合运输 | 2488篇 |
出版年
2022年 | 115篇 |
2021年 | 63篇 |
2020年 | 48篇 |
2019年 | 86篇 |
2018年 | 209篇 |
2017年 | 135篇 |
2016年 | 207篇 |
2015年 | 98篇 |
2014年 | 248篇 |
2013年 | 1233篇 |
2012年 | 351篇 |
2011年 | 460篇 |
2010年 | 303篇 |
2009年 | 377篇 |
2008年 | 350篇 |
2007年 | 280篇 |
2006年 | 230篇 |
2005年 | 272篇 |
2004年 | 297篇 |
2003年 | 188篇 |
2002年 | 151篇 |
2001年 | 133篇 |
2000年 | 140篇 |
1999年 | 100篇 |
1998年 | 129篇 |
1997年 | 114篇 |
1996年 | 139篇 |
1995年 | 149篇 |
1994年 | 84篇 |
1993年 | 189篇 |
1992年 | 160篇 |
1991年 | 77篇 |
1990年 | 84篇 |
1989年 | 57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 | 56篇 |
1977年 | 69篇 |
1976年 | 53篇 |
1975年 | 65篇 |
1974年 | 50篇 |
1973年 | 45篇 |
排序方式: 共有8409条查询结果,搜索用时 546 毫秒
501.
David I. A. Steel 《Maritime Policy and Management》2013,40(6):425-430
This paper discusses negotiations, relative to sea fisheries, in terms of international arrangements—arrangements between the European Economic Community (EEC) and Third Countries; and those between member states of the EEC. 相似文献
502.
Márton Kuslits Dieter Bestle 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2019,57(4):520-542
This paper presents a new steer-by-wire concept using an all-wheel drive vehicle layout with in-wheel motors while completely omitting the application of any dedicated steering device. Steering is based on the so-called differential steering principle which generates the necessary steering moment about the kingpins by a traction force difference between left and right sides of the vehicle. In order to investigate the behaviour of the vehicle and to design the underlying control algorithms, a planar vehicle model is presented, where the vehicle is described as constrained non-holonomic system requiring a special treatment. A state feedback linear controller for controlling of the lateral dynamics of the vehicle at higher speeds and a simple PI angle controller for low-speed manoeuvring are developed. The resulting behaviour of the system is investigated by various simulation experiments demonstrating a comparable steering performance of the new steering concept as that of conventional passenger cars. 相似文献
503.
Michael J. Sobey 《Maritime Policy and Management》2013,40(1):03-29
On 19 October 1989, the International Maritime Organization adopted a joint uslliberian resolution meant to advance international cooperation in maritime casualty investigations. This resolution reflected an international determination to achieve greater cooperation between different states in investigative matters, in a manner consistent with international law. This paper examines how the IMO resolution addresses some of the inherent problems in such a multi-national industry. It also examines the question of whether us lawmakers may, or should, impose stricter controls and restrictions unilaterally on foreign-flag ships which call on us ports. 相似文献
504.
Abstract Artificial reefs have been used extensively in coastal waters to attract and enhance recreational fishery resources. In the United States, they have been traditionally built from “materials of opportunity”; using limited budgets. This paper explores some past planning philosophies and presents a recent artificial reef deployment case that demonstrates a lack of sensitivity to local and regional recreational demand. A systems framework is developed to guide future planning efforts in artificial reef development. The framework is intended to integrate previously fragmented knowledge and to demonstrate the interdisciplinary nature of artificial reef planning. Emphasis is given to advance planning, user dimensions, and the integral issue of reef access. 相似文献
505.
This papers examines the different choices of High Speed Craft (HSC) hull design available and briefly looks at the advantages and disadvantages of each hull form. The trends in various design aspects of HSC such as speed, capacity and size are studied. An investigation on the HSC development is conducted and the future of HSC in the UK is studied. A study onboard an HSC with the aim of trying to determine what passengers think of HSC and why they travel by them is also conducted. Finally, an analysis of the possible market for HSC is carried out. 相似文献
506.
507.
Richard E. Hammond 《Coastal management》2013,41(2):189-192
Onshore Planning for Offshore Oil—Lessons from Scotland by Pamela L. Baldwin and Malcolm F. Baldwin The Conservation Foundation, Washington, D.C., 1975 相似文献
508.
Abstract In southern Rhode Island, there is growing concern that housing and recreational demands will soon overwhelm the capacity of the coastal salt ponds to absorb wastes, produce seafood, and maintain scenic qualities. As a result, coastal towns have been studying the feasibility of using land controls such as downzoning to protect these coastal amenities. The paper presents an economic analysis of the downzoning program proposed in the town of South Kingstown. Hedonic price and contingent valuation methods are used to value coastal amenities. The estimated net present value of “swimmable” water is shown to be $3.1 million. 相似文献
509.
Alan J. Horowitz 《Transportation》2010,37(4):689-703
This paper describes a group of techniques for disaggregating origin–destination tables for travel forecasting that makes
explicit use of observed traffic on a network. Five models within the group are presented, each of which uses nonlinear least-squares
estimation to obtain row and column factors for splitting trip totals from and to larger geographical areas into smaller ones.
The techniques are philosophically similar to Fratar factoring, although the solution method is quite different. The techniques
are tested on a full-sized network for Northfield, MN and are found to work effectively. 相似文献
510.
Out-of-home activities,daily travel,and subjective well-being 总被引:1,自引:0,他引:1
Dick Ettema Tommy Gärling Lars E. Olsson Margareta Friman 《Transportation Research Part A: Policy and Practice》2010,44(9):723-732
It is argued that utility theory that underpins current cost-benefit analyses of daily travel needs to be complemented. An alternative theoretical framework is to this end proposed which applies subjective well-being (SWB) to travel behaviour analysis. It is posited in this theoretical framework that participation in goal-directed activities, facilitated or hindered by travel, contributes to SWB, that the degree of travel-related stress in participating in these activities reduces SWB, and that positive affect associated with travel in itself has an impact on SWB. 相似文献