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   39845篇
  免费   1629篇
  国内免费   23篇
  2020年   405篇
  2019年   449篇
  2018年   654篇
  2017年   687篇
  2016年   698篇
  2015年   522篇
  2014年   629篇
  2013年   2979篇
  2012年   1113篇
  2011年   1222篇
  2010年   778篇
  2009年   710篇
  2008年   1038篇
  2007年   968篇
  2006年   890篇
  2005年   765篇
  2004年   760篇
  2003年   750篇
  2002年   770篇
  2001年   1265篇
  2000年   1248篇
  1999年   911篇
  1998年   421篇
  1997年   424篇
  1996年   393篇
  1992年   795篇
  1991年   740篇
  1990年   752篇
  1989年   710篇
  1988年   709篇
  1987年   652篇
  1986年   713篇
  1985年   695篇
  1984年   579篇
  1983年   515篇
  1981年   378篇
  1979年   574篇
  1978年   471篇
  1977年   395篇
  1976年   402篇
  1975年   507篇
  1974年   642篇
  1973年   637篇
  1972年   525篇
  1971年   521篇
  1970年   468篇
  1969年   531篇
  1968年   618篇
  1967年   544篇
  1966年   571篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Using a Piagétan perspective, this study investigated the ways in which elementary school children perceive changes in the size of a televised image (in this case, a candy bar). The findings suggest that younger children perceive changes in image size from a medium shot to a close-up as changes in the object itself. Children's responses to changes in the televised image parallel their responses to traditional conservation tasks, but conservation of televised images occurs at a later age. In addition, children appear to use different cognitive skills to interpret how a zoom or a cut transforms the size of a televised image. When a zoom is used, children more readily perceive the object as “growing larger.”  相似文献   
22.
We investigated eye‐movements during preschool children's pictorial recall of seen objects. Thirteen 3‐ to 4‐year‐old children completed a perceptual encoding and a pictorial recall task. First, they were exposed to 16 pictorial objects, which were positioned in one of four distinct areas on the computer screen. Subsequently, they had to recall these pictorial objects from memory in order to respond to specific questions about visual details. We found that children spent more time fixating the areas in which the pictorial objects were previously displayed. We conclude that as early as age 3–4 years old, children show specific eye‐movements when they recall pictorial contents of previously seen objects.  相似文献   
23.
24.
25.
26.
27.
28.
Two studies tested the hypothesis that certain positive emotions speed recovery from the cardiovascular sequelae of negative emotions. In Study 1, 60 subjects (Ss) viewed an initial fear-eliciting film, and were randomly assigned to view a secondary film that elicited: (a) contentment; (b) amusement; (c) neutrality; or (d) sadness. Compared to Ss who viewed the neutral and sad secondary films, those who viewed the positive films exhibited more rapid returns to pre-film levels of cardiovascular activation. In Study 2, 72 Ss viewed a film known to elicit sadness. Fifty Ss spontaneously smiled at least once while viewing this film. Compared to Ss who did not smile, those who smiled exhibited more rapid returns to pre-film levels of cardiovascular activation. We discuss these findings in terms of emotion theory and possible health-promoting functions of positive emotions.  相似文献   
29.
30.
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