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   29356篇
  免费   448篇
  国内免费   35篇
教育   20856篇
科学研究   2878篇
各国文化   245篇
体育   2231篇
综合类   19篇
文化理论   300篇
信息传播   3310篇
  2022年   181篇
  2021年   296篇
  2020年   453篇
  2019年   703篇
  2018年   1481篇
  2017年   1498篇
  2016年   1209篇
  2015年   551篇
  2014年   788篇
  2013年   5102篇
  2012年   797篇
  2011年   990篇
  2010年   806篇
  2009年   689篇
  2008年   788篇
  2007年   840篇
  2006年   512篇
  2005年   545篇
  2004年   552篇
  2003年   485篇
  2002年   414篇
  2001年   545篇
  2000年   516篇
  1999年   434篇
  1998年   266篇
  1997年   271篇
  1996年   297篇
  1995年   272篇
  1994年   224篇
  1993年   225篇
  1992年   381篇
  1991年   344篇
  1990年   330篇
  1989年   324篇
  1988年   297篇
  1987年   332篇
  1986年   320篇
  1985年   346篇
  1984年   278篇
  1983年   254篇
  1982年   215篇
  1981年   188篇
  1980年   154篇
  1979年   277篇
  1978年   211篇
  1977年   180篇
  1976年   169篇
  1975年   149篇
  1974年   160篇
  1973年   145篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Working memory training improves children's cognitive performance on untrained tasks; however, little is known about the underlying neural mechanisms. This was investigated in 32 typically developing children aged 10–14 years (19 girls and 13 boys) using a randomized controlled design and multi-modal magnetic resonance imaging (Devon, UK; 2015–2016). Training improved working memory performance and increased intrinsic functional connectivity between the bilateral intraparietal sulci. Furthermore, improvements in working memory were associated with greater recruitment of the left middle frontal gyrus on a complex span task. Repeated engagement of fronto-parietal regions during training may increase their activity and functional connectivity over time, affording greater working memory performance. The plausibility of generalizable cognitive benefits from a neurobiological perspective and implications for neurodevelopmental theory are discussed.  相似文献   
2.
Research in Higher Education - Given the significant need to increase and diversify graduate enrollments within computing fields, it is vital to understand what shapes students’ pathways to...  相似文献   
3.
Seventy-nine 3-year olds and their mothers participated in a laboratory-based task to assess maternal hostility. Mothers also reported their behavioral regulation of their child. Seven years later, functional magnetic resonance imaging data were acquired while viewing emotional faces and completing a reward processing task. Maternal hostility predicted more negative amygdala connectivity during exposure to sad relative to neutral faces with frontal and parietal regions as well as more negative left ventral striatal connectivity during monetary gain relative to loss feedback with the right posterior orbital frontal cortex and right inferior frontal gyrus. In contrast, maternal regulation predicted enhanced cingulo-frontal connectivity during monetary gain relative to loss feedback. Results suggest parenting is associated with alterations in emotion and reward processing circuitry 7–8 years later.  相似文献   
4.
ABSTRACT

The aims of this study were to identify profiles of sedentary behaviour (SB) patterns, based on leisure-time self-reported SB modalities (screen, educative, social, and relaxing) and to evaluate changes in these profiles over 2 years among Spanish youth aged 8–18 years. Latent profile analysis (LPA), a data-driven analytic approach, was used to identify groups of boys and girls (n = 1553; 48% girls; mean±SD age: 12.56 ± 2.49 y) with distinct SB profiles using the SB modalities (time/d) as input variables. Latent transition analysis, an extension of LPA that uses longitudinal data, was used to analyse 2-year changes in these profiles. At baseline, four and three SB profiles were found among boys (labelled: screen, educative, social, and relaxing) and girls (labelled: screen/social, educative, and relaxing), respectively. Overall, more girls (range: 48%-67%) had the same profile over time, than boys (40%-52%). Participants with a screen or relaxing SB profile at baseline were more likely to have an educative profile after 2 years. Youth with a social and an educative SB profile at baseline were more likely to transition to profiles characterized by higher screen and social SB, respectively. Using a novel and person-centered approach, this study identified gender-specific SB profiles that were moderately stable over time.  相似文献   
5.
Editorial     
B. Sury 《Resonance》2018,23(7):723-725
  相似文献   
6.
7.
8.
Cultural Studies of Science Education - The retention of underrepresented students remains a significant challenge in the STEM (Science, Technology, Engineering and Math) disciplines. A broad range...  相似文献   
9.
10.
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