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   19454篇
  免费   1634篇
  国内免费   1128篇
  22216篇
  2024年   55篇
  2023年   407篇
  2022年   328篇
  2021年   347篇
  2020年   738篇
  2019年   735篇
  2018年   732篇
  2017年   835篇
  2016年   828篇
  2015年   515篇
  2014年   673篇
  2013年   2333篇
  2012年   408篇
  2011年   492篇
  2010年   416篇
  2009年   632篇
  2008年   834篇
  2007年   895篇
  2006年   860篇
  2005年   720篇
  2004年   623篇
  2003年   508篇
  2002年   489篇
  2001年   318篇
  2000年   293篇
  1999年   254篇
  1998年   193篇
  1997年   184篇
  1996年   150篇
  1995年   127篇
  1994年   119篇
  1993年   87篇
  1992年   71篇
  1991年   50篇
  1990年   50篇
  1989年   28篇
  1988年   43篇
  1985年   372篇
  1984年   418篇
  1983年   344篇
  1982年   450篇
  1981年   442篇
  1980年   442篇
  1979年   396篇
  1978年   445篇
  1977年   349篇
  1976年   353篇
  1975年   272篇
  1974年   278篇
  1973年   236篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Three measures of chronic self-esteem, plus four measures developed to assess situational components of self-esteem (task-specific self-esteem and social self-esteem), were administered to 238 undergraduates at a large, urban university and a community college in the southeastern United States. Evidence for a composite construct of self-esteem was found. Results also indicate task-specific self-esteem correlates as high as .42 (p < .01) with chronic self-esteem and as high as .76 (p < .01) with social self-esteem. Task-specific self-esteem was found to be a better predictor of grade point average than chronic or social self-esteem. Suggestions are made for further research on the situational components of self-esteem to extend current findings.  相似文献   
92.
Transfer of matching-to-figure samples in the pigeon   总被引:2,自引:1,他引:1       下载免费PDF全文
Three pigeons were trained on a modified six-key matching-to-sample procedure. The third peck on the figure-sample key (which presented a bird, hand, face, beetle, rabbit, fish, flower, or red hue, as the sample) lighted only one comparison key. Every three additional pecks on the sample lighted another comparison key, up to a maximum of five keys. Pecks on keys of matching figures produced grain. Pecks on nonmatching keys (mismatches) turned off all lights on the comparison keys and repeated the trial. Three figures were used during acquisition. The birds learned to peck each sample until the matching comparison stimulus appeared on one of three comparison stimulus keys, and then to peck that key. Later, five novel stimuli, employed as both sample and comparison stimuli, and two additional matching keys were added. Each bird showed matching transfer to the novel samples. The data suggest that the birds may have learned the concept of figure matching rather than a series of two-component chains or discrete five-key discriminations.  相似文献   
93.
94.
95.
96.
97.
98.
Fear and courage     
S. Rachman   《Behavior Therapy》1984,15(1):109-120
  相似文献   
99.
Earlier work on the quality of care in settings for severely and profoundly mentally-handicapped adults raised the question whether any useful purpose is served by promoting the extensive use of simple recreational materials to occupy people. Data were collected by direct observation on the activity of 6 adults living in a staffed house organized to promote engagement in household activities. Observations were taken over 5 weekdays from 07.00 to 10.00 and 15.00 to 23.00hr. The results showed that Ss spent between 22 and 67% of available time in purposeful activity. Between 27 and 65% of purposeful activity was engagement in domestic or housework tasks. Even the most handicapped people spent more time engaged in housework than in leisure and recreational tasks. The implications of these data are commented on and measurement issues which arise in ordinary housing as opposed to institutional settings are discussed.  相似文献   
100.
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