全文获取类型
收费全文 | 901篇 |
免费 | 8篇 |
专业分类
公路运输 | 310篇 |
综合类 | 38篇 |
水路运输 | 293篇 |
铁路运输 | 33篇 |
综合运输 | 235篇 |
出版年
2023年 | 10篇 |
2022年 | 20篇 |
2021年 | 8篇 |
2020年 | 8篇 |
2019年 | 7篇 |
2018年 | 35篇 |
2017年 | 15篇 |
2016年 | 30篇 |
2015年 | 8篇 |
2014年 | 31篇 |
2013年 | 132篇 |
2012年 | 33篇 |
2011年 | 48篇 |
2010年 | 36篇 |
2009年 | 48篇 |
2008年 | 48篇 |
2007年 | 21篇 |
2006年 | 12篇 |
2005年 | 18篇 |
2004年 | 19篇 |
2003年 | 5篇 |
2002年 | 13篇 |
2001年 | 8篇 |
2000年 | 14篇 |
1999年 | 11篇 |
1998年 | 24篇 |
1997年 | 14篇 |
1996年 | 20篇 |
1995年 | 16篇 |
1994年 | 5篇 |
1993年 | 7篇 |
1992年 | 12篇 |
1991年 | 8篇 |
1990年 | 12篇 |
1989年 | 8篇 |
1988年 | 5篇 |
1987年 | 9篇 |
1986年 | 8篇 |
1985年 | 8篇 |
1984年 | 9篇 |
1983年 | 12篇 |
1982年 | 7篇 |
1981年 | 12篇 |
1980年 | 8篇 |
1979年 | 15篇 |
1977年 | 15篇 |
1976年 | 11篇 |
1975年 | 10篇 |
1974年 | 9篇 |
1973年 | 5篇 |
排序方式: 共有909条查询结果,搜索用时 31 毫秒
131.
132.
D. C. Kapoor 《Maritime Policy and Management》1977,4(5):255-263
In this paper Admiral Kapoor examines some of the problems relating to the delimitation of maritime boundaries, particularly that of exclusive economic zones, as they affect the hydrographic surveyor. 相似文献
133.
134.
135.
An important characteristic of urban transportation policy and planning today is the increasing role that the private sector is playing in identifying and implementing transportation projects. For example, a recent examination of the possible forms of such involvement found that there were four major categories of action that could be used to classify recent private-sector efforts in urban transportation: (1) aid to and/or provision of transportation services; (2) formation of advocacy or advisory groups whose purpose is to influence public policy; (3) sponsorship of transportation studies; and (4) provision of management assistance to public agencies (Gordon, 1982). In many of these efforts, the successful implementation of a project or program required close cooperation between public and private-sector officials. The purpose of this paper is to examine the characteristics of this interaction and explore the implications for transportation planning and policy.Examples of public/private-sector interaction in two Connecticut cities, Hartford and Stamford, are used to illustrate the characteristics of successful transportation program implementation. Although the examples are limited to two cities, and are mainly concerned with one major category of action (ridesharing), the characteristics of the process used and of the results can be applied to other situations where public/privatesector interaction is desired. 相似文献
136.
D. K. Fleming 《Maritime Policy and Management》1979,6(4):253-267
The United States meets the world shipping crisis of the 1970s with a high-cost merchant fleet and a national maritime policy which needs clearer articulation. This paper examines the objectives, rationale and methods of implementation of the Us maritime programme with attention, finally, to the question of governmental reorganization. 相似文献
137.
H. D. Smith 《Maritime Policy and Management》1977,4(6):351-376
The problems associated with hydrocarbon extraction in the EEZ are discussed under the headings of resources and environment, technology and the industrial structure, government management, decision-making, and policy formulation. Policy areas identified include boundary delimitation relative to resources, environment and technology, co-ordination and decision-making machinery, relationships with UK and EEC energy policies, and regional planning of the sea and coastal areas used by the off-shore industry. 相似文献
138.
139.
Glenn D. Aguilar Hiroyuki Yamamoto Takeo Koyama 《Journal of Marine Science and Technology》1996,1(3):138-148
The development of a parametric hull form design system utilizing combined knowledge-based and objectoriented methodologies,
approaches, and techniques is the major purpose of this research. One objective was the development of a powerful, intuitive,
and parameter-based hull definition system with a related hull definition advisory system that would provide useful and necessary
advice to the user. Object and knowledge modeling activities were conducted during the analysis and design stage to facilitate
the implementation of a hull design program and advisory system. The hull design system includes the generation of a geometric
model from a process of aggregating simple user-selected shapes representing different boundaries. Design involves the capability
to vary simple parameters such as entrance angles, length-breadth ratios, and radii to define local and general surface geometries.
Hydrostatic calculations are included for analysis; results are referred to an advisory system for evaluation and the determination
of the acceptability of parameters and analysis results. The advisory system includes a knowledge bases consisting of hull
form databases, results of the statistical analysis of data, design parameter constraints, and expert knowledge acquired from
designers, reference materials, and technical reports. Use of the design tool with the advisory system results in the rapid
generation of hull forms and associated design evaluations. Flexibility in decision making results from the separation of
the design system from the advisory system. The independence of the two systems allows for a wide range of user experience
with experts using the design tool with minimal reference to the advisory system. On the other hand, the expertise and knowledge
stored in the advisory system is fully available to inexperienced designers and users. 相似文献
140.
A. D. De Pater 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1989,18(5):243-274
A survey is given of the theory developed by author during recent years for an optimal design of railway vehicle running gears. It enables the designer to build a running gear which at the same time has good curving properties and is stable up to a high vehicle speed. 相似文献