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   12196篇
  免费   7篇
教育   9365篇
科学研究   1235篇
各国文化   8篇
体育   457篇
综合类   2篇
文化理论   385篇
信息传播   751篇
  2023年   1篇
  2022年   1篇
  2021年   13篇
  2020年   7篇
  2019年   31篇
  2018年   2201篇
  2017年   2098篇
  2016年   1597篇
  2015年   126篇
  2014年   134篇
  2013年   272篇
  2012年   233篇
  2011年   708篇
  2010年   841篇
  2009年   449篇
  2008年   662篇
  2007年   1159篇
  2006年   86篇
  2005年   414篇
  2004年   460篇
  2003年   375篇
  2002年   138篇
  2001年   11篇
  2000年   35篇
  1999年   11篇
  1998年   10篇
  1997年   26篇
  1996年   13篇
  1995年   11篇
  1994年   7篇
  1993年   5篇
  1992年   11篇
  1991年   13篇
  1990年   7篇
  1989年   5篇
  1988年   8篇
  1987年   1篇
  1986年   1篇
  1985年   3篇
  1984年   4篇
  1983年   2篇
  1982年   2篇
  1981年   2篇
  1980年   2篇
  1979年   2篇
  1977年   2篇
  1976年   3篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
This paper describes the French initiative in materials research against both a national and an international background, in an attempt to disentangle the local circumstances, which prompted this governmental initiative, and to characterize the specific profile of materials research in France. In presenting a biography of the interdisciplinary program in materials research (PIRMAT), we argue that: i) the PIRMAT denotes a failure of the French science policy in materials research; ii) the leadership of the CNRS led to a specific style of research, quite different from the engineering approach of Materials Science and Engineering, and characteristic of a French style in materials research.  相似文献   
84.
85.
86.
Kaare Aagaard 《Minerva》2017,55(3):279-297
This article outlines the evolution of a national research funding system over a timespan of more than 40 years and analyzes the development from a rather stable Humboldt-inspired floor funding model to a complex multi-tiered system where new mechanisms continually have been added on top of the system. Based on recent contributions to Historical Institutionalism it is shown how layering and displacement processes gradually have changed the funding system along a number of dimensions and thus how a series of minor adjustments over time has led to a transformation of the system as a whole. The analysis also highlights the remarkable resistance of the traditional academically oriented research council system towards restructuring. Due to this resistance the political system has, however, circumvented the research council system and implemented change through other channels of the funding system. For periods of time these strategies have marginalized the role of the councils.  相似文献   
87.
88.
Brain injury research in sport employs a variety of physical models equipped with accelerometers. These acceleration signals are commonly processed using filters. The purpose of this research was to determine the effect of applying filters with different cutoff frequencies to the acceleration signals used as input for finite element modeling of the brain. Signals were generated from reconstructions of concussion events from American football and ice hockey in the laboratory using a Hybrid III headform. The resulting acceleration signals were used as input for the University College Dublin Brain Trauma Model after being processed with filters. The results indicated that using a filter with a cutoff of 300 Hz or higher had little effect on the resulting strain measures. In some cases there was some effect of the filters on the peak linear (8–30g) and rotational measures (1000–4000 rad/s2), but little effect on the finite element strain result (approximately 2–6 %). The short duration and high magnitude accelerations, such as the puck impact, were most affected by the cutoff frequency of different filters.  相似文献   
89.
90.
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