全文获取类型
| 收费全文 | 319篇 |
| 免费 | 1篇 |
| 国内免费 | 1篇 |
专业分类
| 教育 | 248篇 |
| 科学研究 | 18篇 |
| 各国文化 | 6篇 |
| 体育 | 25篇 |
| 综合类 | 1篇 |
| 文化理论 | 2篇 |
| 信息传播 | 21篇 |
出版年
| 2019年 | 3篇 |
| 2018年 | 2篇 |
| 2017年 | 4篇 |
| 2016年 | 2篇 |
| 2015年 | 4篇 |
| 2014年 | 4篇 |
| 2013年 | 109篇 |
| 2012年 | 4篇 |
| 2011年 | 8篇 |
| 2010年 | 5篇 |
| 2009年 | 14篇 |
| 2008年 | 4篇 |
| 2007年 | 4篇 |
| 2006年 | 2篇 |
| 2005年 | 9篇 |
| 2004年 | 3篇 |
| 2003年 | 5篇 |
| 2002年 | 6篇 |
| 2001年 | 5篇 |
| 2000年 | 3篇 |
| 1999年 | 4篇 |
| 1998年 | 3篇 |
| 1997年 | 7篇 |
| 1996年 | 4篇 |
| 1995年 | 2篇 |
| 1994年 | 3篇 |
| 1993年 | 8篇 |
| 1992年 | 7篇 |
| 1991年 | 10篇 |
| 1990年 | 5篇 |
| 1989年 | 6篇 |
| 1988年 | 3篇 |
| 1987年 | 5篇 |
| 1986年 | 4篇 |
| 1985年 | 3篇 |
| 1984年 | 3篇 |
| 1983年 | 2篇 |
| 1982年 | 7篇 |
| 1981年 | 4篇 |
| 1980年 | 6篇 |
| 1979年 | 3篇 |
| 1978年 | 2篇 |
| 1975年 | 5篇 |
| 1973年 | 3篇 |
| 1971年 | 2篇 |
| 1969年 | 1篇 |
| 1967年 | 1篇 |
| 1966年 | 1篇 |
| 1963年 | 1篇 |
| 1928年 | 1篇 |
排序方式： 共有321条查询结果，搜索用时 15 毫秒
281.
282.
283.
284.
285.
286.
Josje van Houwelingen Raf M. Antwerpen Ad P. C. Holten Ernst Jan Grift Jerry Westerweel Herman J. H. Clercx 《Sports Engineering》2018,21(4):419-427
In this paper a video-based method to automatically track instantaneous velocities of a swimmer is presented. Single cameras were used to follow a marker (LED) attached to the body. The method is inspired by particle tracking techniques, traditionally used in the field of fluid dynamics, to measure local velocities of a fluid flow. During the validation experiment, a white LED was attached to the hip of a swimmer together with a speedometer. A swimmer performed four different stroke types. The velocity profiles using LED tracking were captured and showed less noise than the speedometer measurements. Only at times when the marker disappeared above the water surface due to body role in front crawl and backstroke swimming did the LED tracking fail to capture the athlete’s motion. The algorithm was tested in a 2D case with a single LED to illustrate the proof of principle, but should be suitable for implementation in a 3D analysis or multiple LED analysis. 相似文献
287.
288.
Jerry L. Martin 《Academic Questions》1995,8(4):70-80
Jerry L. Martin, former acting chairman of the National Endowment for the Humanities, is president of the National Alumni
Forum and adjunct professor of political philosophy and public policy at Georgetown University. 相似文献
289.
The focus of this paper is a piece of research which sought to evaluate a pack of materials designed to support the introduction of core transferable skills into the subject-based curriculum. The writers contextualize their work with a brief historical review of the development of this area over the last two decades, highlighting both the ambiguity and the continuing confusion that have surrounded the idea of generic skills. Apart from giving general support to the aims which informed the programme's development, the outcome of the investigation identifies a significant difference in the way teachers and students conceptualize the curriculum. 相似文献
290.