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   42654篇
  免费   1824篇
  国内免费   28篇
  2020年   471篇
  2019年   586篇
  2018年   830篇
  2017年   814篇
  2016年   900篇
  2015年   614篇
  2014年   760篇
  2013年   3760篇
  2012年   1412篇
  2011年   1441篇
  2010年   863篇
  2009年   932篇
  2008年   1274篇
  2007年   1269篇
  2006年   1144篇
  2005年   1055篇
  2004年   1043篇
  2003年   978篇
  2002年   1018篇
  2001年   1251篇
  2000年   1218篇
  1999年   952篇
  1998年   514篇
  1997年   486篇
  1996年   441篇
  1995年   467篇
  1994年   418篇
  1993年   450篇
  1992年   787篇
  1991年   721篇
  1990年   697篇
  1989年   656篇
  1988年   644篇
  1987年   589篇
  1986年   590篇
  1985年   658篇
  1984年   594篇
  1983年   561篇
  1982年   481篇
  1979年   592篇
  1978年   485篇
  1977年   439篇
  1976年   458篇
  1975年   483篇
  1974年   570篇
  1973年   558篇
  1972年   471篇
  1968年   479篇
  1967年   419篇
  1966年   413篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Our aim was to explore the role of parents in the transmission of stereotypical body size attitudes and awareness of weight loss strategies to preschool children. Participants were 279 3‐year‐old children and their parents, who provided data at baseline and 1 year later. Parents completed self‐report body size attitude and dieting measures. Child weight bias and awareness of weight loss strategies were assessed through interview. Over time, negative associations with large bodies and awareness of weight loss strategies increased. Fathers’ attitudes prospectively predicted boys’ weight bias and awareness of weight loss strategies. Among girls, parental attitudes were less predictive. Findings confirm the importance of fathers in the development of boys’ body attitudes and inform prevention programmes.  相似文献   
22.
23.
24.
25.
This study examined the influence of various group diversity dimensions on collaborative creativity related to the healthcare system. Research findings on the association between diversity and brainstorming performance has been mixed. Diversity that increases cognitive stimulation or promotes elaboration has been shown to increase group performance. Participants exchanged ideas, replied, and elaborated using an electronic discussion board in an asynchronous fashion in groups of five over a period of 4 weeks. The groups varied in diversity of ethnicity, gender, age, and political orientation, but participants were not made aware of this diversity. Age and gender diversity were related to lower levels of replying to ideas and lower idea novelty but political diversity was related to increased replies and novelty. If a topic engages people with different perspectives to actively respond to others’ ideas, this can increase the creative potential of idea sharing in groups. Political or value-based diversity has the potential for creative solutions if the other participants’ political or value-based identities are not made salient.  相似文献   
26.
27.
28.
29.
30.
The ability of two species of tits to remember the location and/or features of an object was tested in a delayed-matching-to-sample procedure. Three values of retention interval between presentation of the sample stimulus and the choice--30 sec, 5 min, and 15 min--were used. Both species performed at above-chance level at all retention intervals, and there was no significant decline in accuracy with increasing interval. A pool of 100 stimulus objects was used, but the results of control trials indicated that the birds responded primarily to location rather than stimulus features of the object itseif. Although the food-storing marsh tit tended to perform at a higher level than the non-storing great tit, the only significant difference between the species was in the first 50 trials of the first treatment, when the birds were acquiring the task. The results are discussed in relation to the hypothesized special memory capacity of food-storing birds.  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