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   8448篇
  免费   97篇
  国内免费   7篇
教育   6206篇
科学研究   724篇
各国文化   148篇
体育   526篇
综合类   5篇
文化理论   105篇
信息传播   838篇
  2021年   55篇
  2020年   84篇
  2019年   155篇
  2018年   207篇
  2017年   238篇
  2016年   221篇
  2015年   171篇
  2014年   216篇
  2013年   2050篇
  2012年   172篇
  2011年   192篇
  2010年   182篇
  2009年   158篇
  2008年   200篇
  2007年   205篇
  2006年   188篇
  2005年   191篇
  2004年   177篇
  2003年   154篇
  2002年   147篇
  2001年   126篇
  2000年   126篇
  1999年   133篇
  1998年   102篇
  1997年   113篇
  1996年   108篇
  1995年   140篇
  1994年   116篇
  1993年   101篇
  1992年   102篇
  1991年   96篇
  1990年   96篇
  1989年   97篇
  1988年   86篇
  1987年   87篇
  1986年   79篇
  1985年   88篇
  1984年   95篇
  1983年   88篇
  1982年   95篇
  1981年   74篇
  1980年   53篇
  1979年   67篇
  1978年   61篇
  1977年   72篇
  1976年   59篇
  1975年   45篇
  1974年   48篇
  1973年   53篇
  1971年   34篇
排序方式: 共有8552条查询结果,搜索用时 25 毫秒
61.
62.
John Downer 《Minerva》2017,55(2):229-248
Publics and policymakers increasingly have to contend with the risks of complex, safety-critical technologies, such as airframes and reactors. As such, ‘technological risk’ has become an important object of modern governance, with state regulators as core agents, and ‘reliability assessment’ as the most essential metric. The Science and Technology Studies (STS) literature casts doubt on whether or not we should place our faith in these assessments because predictively calculating the ultra-high reliability required of such systems poses seemingly insurmountable epistemological problems. This paper argues that these misgivings are warranted in the nuclear sphere, despite evidence from the aviation sphere suggesting that such calculations can be accurate. It explains why regulatory calculations that predict the reliability of new airframes cannot work in principle, and then it explains why those calculations work in practice. It then builds on this explanation to argue that the means by which engineers manage reliability in aviation is highly domain-specific, and to suggest how a more nuanced understanding of jetliners could inform debates about nuclear energy.  相似文献   
63.
64.
65.
66.
67.
68.
Based on technological and analytical advances, the capability to more accurately and finitely examine biomechanical and skill characteristics of movement has improved. The purpose of this study was to use Inertial Measurement Units (IMUs) and Functional Principal Components Analysis (fPCA) to examine the role of movement variability (assessed via angular velocity), on 2 divers (1 international level; 1 national) performing the forward 3½ pike somersault dive. Analysis of angular velocity curves during ive-flight identified 5 fPCs, accounting for 96.5% of movement variability. The national diver’s scatter plots and standard deviation of fPC scores illustrated larger magnitudes of angular velocity variability across dive flight. For fPC1 and fPC3, magnitudes of SD variability were 282.6 and 201.5, respectively. The international diver illustrated more consistent angular velocity profiles, with clustering of fPCs scores (e.g., fPC1 & 3 = SD’s of 75.2 & 68.0). To account for lower variability in the international diver, the ability to better coordinate movement sequences and functionally utilise feedback in response to initiation of the somersault position is highlighted. Overall, findings highlight how both IMUs and fPCA can more holistically and finitely examine the biomechanical and skill characteristics of movement sequences with the capability to inform athlete development.  相似文献   
69.
70.
On the fiftieth anniversary of the first publication of English in Education, this article reviews the journal's contribution to research and practice in the teaching of English. A thematic analysis based on close study of a sample of volumes is arranged chronologically (to show the development of ideas and practices) and thematically in terms of language mode (speaking; writing; reading, including new technologies). The article argues that the journal archive can shed light on the educational past in ways that can effectively inform the educational present and help to set agenda for the future.  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