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   1285篇
  免费   31篇
  国内免费   2篇
教育   953篇
科学研究   40篇
各国文化   12篇
体育   165篇
文化理论   11篇
信息传播   137篇
  2023年   5篇
  2022年   11篇
  2021年   16篇
  2020年   28篇
  2019年   54篇
  2018年   71篇
  2017年   61篇
  2016年   52篇
  2015年   45篇
  2014年   42篇
  2013年   312篇
  2012年   47篇
  2011年   43篇
  2010年   29篇
  2009年   41篇
  2008年   44篇
  2007年   38篇
  2006年   23篇
  2005年   34篇
  2004年   37篇
  2003年   22篇
  2002年   21篇
  2001年   16篇
  2000年   19篇
  1999年   11篇
  1998年   15篇
  1997年   18篇
  1996年   18篇
  1995年   12篇
  1994年   14篇
  1993年   13篇
  1992年   9篇
  1991年   8篇
  1990年   9篇
  1989年   6篇
  1988年   6篇
  1987年   8篇
  1986年   3篇
  1985年   2篇
  1984年   4篇
  1983年   6篇
  1982年   8篇
  1981年   4篇
  1980年   3篇
  1979年   4篇
  1978年   3篇
  1977年   9篇
  1976年   3篇
  1975年   4篇
  1974年   2篇
排序方式: 共有1318条查询结果,搜索用时 31 毫秒
101.
102.
This essay argues that Lee Edelman's 2004 Edelman, L. 2004. No Future: Queer Theory and the Death Drive, Durham: Duke University Press. [Crossref] [Google Scholar] No Future, while most well known for challenging the heteronormative fantasy of reproductive futurism, also performs a systematic critique of Lacanian ‘sexual difference’. This essay tracks that critique, showing its moments of success and of failure, and concludes that Edelman's neologism – the sinthomosexual, whose jouissance he believes to be capable of undoing the symbolic order – in fact supports rather than challenges it.  相似文献   
103.
104.
ABSTRACT

Professional American football games are recorded in digital video with multiple cameras, often at high resolution and high frame rates. The purpose of this study was to evaluate the accuracy of a videogrammetry technique to calculate translational and rotational helmet velocity before, during and after a helmet impact. In total, 10 football impacts were staged in a National Football League (NFL) stadium by propelling helmeted 50th percentile male crash test dummies into each other or the ground at speeds and orientations representative of concussive impacts for NFL players. The tests were recorded by experienced sports film crews to obtain video coverage and quality typically available for NFL games. A videogrammetry procedure was used to track the position and rotation of the helmet throughout the relevant time interval of the head impact. Compared with rigidly mounted retroreflective marker three dimensional (3-D) motion tracking that was concurrently collected in the experiments, videogrammetry accurately calculated changes in translational and rotational velocity of the helmet using high frame rate (two cameras at 240 Hz) video (7% and 15% error, respectively). Low frame rate (2 cameras at 60 Hz) video was adequate for calculating pre-impact translational velocity but not for calculating the translational or rotational velocity change of the helmet during impact.  相似文献   
105.
106.
ABSTRACT

This study aimed to examine the effects of two jump squat (JS) training programs involving different loading ranges in under-20 soccer players during a preseason period. Twenty-three elite young soccer players performed sprint speed (at 5-, 10-, and 20-m), change-of-direction (COD) speed, JS peak-power (PP), and countermovement jump (CMJ) tests pre and post four weeks of training. Athletes were pair-matched in two groups according to their optimum power loads (OPL) as follows: lower than OPL (LOPL; athletes who trained at a load 20% lower than the OPL) and higher than OPL (HOPL; athletes who trained at a load 20% higher than the OPL). Magnitude-based inferences were used to compare pre- and post-training measures. Meaningful increases in the PP JS were observed for both groups. Likely and possible improvements were observed in the 5- and 10-m sprint velocity in the LOPL group. Meanwhile, possible and likely improvements were observed in the CMJ, 5- and 10-m sprint velocity, and COD speed in the HOPL group. Overall, both training schemes induced positive changes in athletic performance. Soccer coaches and sport scientists can implement the JS OPL-based training schemes presented here, either separately or combined, to improve the physical performance of youth soccer players.  相似文献   
107.
Content‐based automated scoring has been applied in a variety of science domains. However, many prior applications involved simplified scoring rubrics without considering rubrics representing multiple levels of understanding. This study tested a concept‐based scoring tool for content‐based scoring, c‐rater?, for four science items with rubrics aiming to differentiate among multiple levels of understanding. The items showed moderate to good agreement with human scores. The findings suggest that automated scoring has the potential to score constructed‐response items with complex scoring rubrics, but in its current design cannot replace human raters. This article discusses sources of disagreement and factors that could potentially improve the accuracy of concept‐based automated scoring.  相似文献   
108.
109.
ect Cornerstone     
  相似文献   
110.
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