首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   300篇
  免费   4篇
公路运输   63篇
综合类   4篇
水路运输   110篇
铁路运输   6篇
综合运输   121篇
  2022年   1篇
  2019年   5篇
  2018年   3篇
  2017年   12篇
  2016年   7篇
  2015年   6篇
  2014年   3篇
  2013年   58篇
  2012年   4篇
  2011年   6篇
  2010年   19篇
  2009年   21篇
  2008年   22篇
  2007年   23篇
  2006年   12篇
  2005年   6篇
  2004年   6篇
  2003年   4篇
  2002年   5篇
  2001年   2篇
  2000年   4篇
  1999年   3篇
  1998年   3篇
  1997年   3篇
  1996年   7篇
  1995年   6篇
  1994年   1篇
  1993年   6篇
  1992年   4篇
  1991年   4篇
  1990年   2篇
  1988年   2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   1篇
  1972年   1篇
排序方式: 共有304条查询结果,搜索用时 234 毫秒
71.
This study reports on scientist/crew relations aboard research vessels at sea. It is a case study in a case study in a long-range project dealing with the relations of natural scientists in the U.S.A. to various segments of the lay population. An earlier paper dealt with the interaction of scientists and Government policy makers during the science-advisory process [1]. In that study we found that the frustration was reciprocal; scientists and policy makers were equally vocal on what was wrong with ‘ the other groups’. The present research, by comparison, focuses on scientists and members of ‘the working class’. Here we find the frustration rather one-sided, reflecting the differences in status and power of the two groups. On a research vessel, science and scientists control the lives and careers of the mariners. In the science-advising committee, members of both government and science meet as social equals.

In this paper elements of conflict between scientists and crew on a research vessel are described. It is suggested that conflict between these two groups is the inevitable result of extending the ‘intellectual’/‘worker’ class conflict of our society to a closed space at sea. The controlling mechanism of the conflict may be called ‘subcultural privacy’, a mechanism worked out by mariners to cope with the disrupting effects of a constant stream of strangers into their sea-going home. The mechanism takes the form of institutionalized ‘bitching’ and systematic physical separation of scientists and crew during critical periods of the day. It is suggested that attempts to create greater crew/scientist harmony by forcing by greater interaction (and thus a breakdown of subcultural privacy) will be counter productive.  相似文献   
72.
Peter K. Else 《运输评论》2013,33(4):291-309
Governments have rarely been content to leave the provision of public transport services entirely to the market. Competition has been regulated and increasingly services have been subsidized from public funds. However, the criteria for such subsidies have been a continuing source of debate. Economists have tended to emphasize efficiency criteria and advocated the use of cost‐benefit analysis, but, for a variety of reasons, in the U.K. at least, this approach does not seem to have played a major role in the allocation of subsidies. Others have advocated more needs‐based approaches. Whilst these have been tried, they also have their limitations. The first few sections of the paper, therefore, review the development of these approaches in the U.K. and consider their shortcomings from the point of view of deciding on transport subsidies. In the latter part of the paper it is suggested that developments in the appraisal of health care procedures, particularly in the use of cost‐utility techniques, indicate a possible alternative approach. The approach in the health context is outlined and it is demonstrated how it might be applied to the appraisal of local transport services.  相似文献   
73.
74.
观市2011     
全球经济机遇与挑战并存 2011年全球经济复苏呈现"双轨"态势.国际货币基金组织(IMP)预测2011年和2012年新兴经济体和发展中国家将保持在6.5%的增长水平,略低于2010年7%的增速,其中增速最快的仍是亚洲发展中国家的中国和印度.2011年和2012年发达国家经济将增长2.5%.  相似文献   
75.
Peter Granata 《船艇》2010,(2):48-49
生活对每个人来说都是必需的。作为一个行业,我们没有太多理由认为人们会受诱惑买我们的产品。 的确,一个客户可能会对某船的尺寸和独特设计有兴趣,甚至对它的设计建造最细微的细节都感兴趣;但是从一开始就吸引他的其实是一个简单的感情,那就是这艘船给他的感觉如何。  相似文献   
76.
随着城市和交通路网建设的发展,以及用户对产品认知的提高,用户开始对GPS导航产品的有效性产生了质疑,根源则是现今绝大部分市场上正在使用的导航产品完全依赖于GPS进行定位,由于技术特性的限制,该类导航产品存在很大的缺陷,这些缺陷导致了频繁的误入歧路或者无法给用户有效指导,甚至用户反映用不如不用的结论。  相似文献   
77.
We consider the problem of aligning barge rotations with quay schedules of terminals in the port of Rotterdam. Every time a barge visits the port, it has to make a rotation along, on average, eight terminals to load and unload containers. A central solution, e.g., a trusted party that coordinates the activities of all barges and terminals, is not feasible for several reasons. We propose a multi-agent based approach of the problem, since a multi-agent system can mirror to a large extent the way the business network is currently organized and can provide a solution that is acceptable to each of the parties involved. We examine the value of exchanging different levels of information and evaluate the performance by means of simulation. We compare the results with an off-line scheduling algorithm. The results indicate that, in spite of the limited information available, our distributed approach performs quite well when compared to the central approach. In addition, our experiments indicate that an information exchange based on waiting profiles reduces the average tardiness per barge with almost 80% when compared to the situation with no information exchange. We therefore think that waiting profiles provide a promising protocol to tackle this problem.  相似文献   
78.
Peter 《世界汽车》2007,(1):52-55
Smart近日发布的新一代Fortwo延续独特的城市用微型车概念.新一代的发展更侧重于内涵.提高Fortwo的驾乘舒适性、操控性,主被动安全水平和更环保的排放。新车的外形设计在上一代的基础上渗入了新的设计语言.并试图改变第一代过于女性化的形象.以求新车能得到更多男性买家的认同。  相似文献   
79.
目前,针对公路上的“电子眼”,一些车主购买了“反雷达测速器”(俗称电子狗)来对抗,目的是为了避免收到“牛肉干”(罚款单)。但是“电子狗”质量参差不齐,而且价格也不菲,这让车主对“电子狗”又爱又恨。随着国内导航软件技术的进步及导航地图更完整地包含了雷达测速器位置,“电子狗”功能整合在导航系统中已成为现实。导航仪价格的不断下降,  相似文献   
80.
Peter 《世界汽车》2007,(1):56-57
JeepCompass是以2005年法兰克福车展中发表的JeepCompass概念车发展而成的全新产品,除了具有SUV的外形与特性之外,还结合了轿车的性能、操控、省油及适宜价格等优点。JeepCompass是Jeep旗下第一款以前轮驱动底盘为基础的产品,并且以四轮独立悬架系统提供一般道路的乘坐舒适度、操控与驾驶乐趣。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号