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   33505篇
  免费   637篇
  国内免费   6篇
  34148篇
  2020年   410篇
  2019年   473篇
  2018年   663篇
  2017年   627篇
  2016年   726篇
  2015年   496篇
  2014年   579篇
  2013年   2643篇
  2012年   1071篇
  2011年   1078篇
  2010年   661篇
  2009年   714篇
  2008年   929篇
  2007年   919篇
  2006年   799篇
  2005年   696篇
  2004年   668篇
  2003年   630篇
  2002年   648篇
  2001年   1082篇
  2000年   1077篇
  1999年   790篇
  1998年   336篇
  1997年   309篇
  1995年   315篇
  1992年   625篇
  1991年   593篇
  1990年   570篇
  1989年   547篇
  1988年   540篇
  1987年   480篇
  1986年   482篇
  1985年   533篇
  1984年   437篇
  1983年   403篇
  1982年   315篇
  1979年   476篇
  1978年   332篇
  1977年   307篇
  1976年   320篇
  1975年   368篇
  1974年   437篇
  1973年   469篇
  1972年   403篇
  1971年   345篇
  1970年   322篇
  1969年   337篇
  1968年   420篇
  1967年   371篇
  1966年   359篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
271.
A model is presented for factor analysing scores on a set of psychological tests administered as both pre- and postmeasures in a study of change. The model assumes that the same factors underlie the tests on each occasion, but that factor scores as well as factor loadings may change between occasions. Factors are defined to be orthogonal between as well as within occasions. A two-stage least squares procedure for fitting the model is described, and generally provides a unique rotation solution for the factors on each occasion.We thank M. W. Browne, R. P. McDonald, R. Pruzek, and the Managing Editor for their constructive comments.  相似文献   
272.
273.
274.
275.
276.
In the first of two studies, the responding of four albino rats was differentially reinforced in the presence of noise and light together and then tested in the presence of the noise and the light separately during extinction. The light exercised substantially more control of responding than did the noise. In the second study the responding of a similar group of four rats was differentially reinforced in the presence of the noise and the light separately. Control of responding by the light developed more rapidly than control by the noise. Results suggest that levels of control by stimuli after differential reinforcement with respect to the stimuli together can be predicted by the rates of development of control during differential reinforcement with respect to the stimuli separately.  相似文献   
277.
278.
279.
SURVIVAL VALUE     
  相似文献   
280.
Three experiments are reported, which are attempts to replicate the finding of Ross and Gregory (1964) that difference thresholds for weights can be lowered by means of the size-weight illusion. Three different procedures were used, the first one (experiment I) being designed to show whether or not changes in a subject's judgement criterion could account for apparent changes in sensitivity. The second method (Experiment II) was a replication of Ross and Gregory's first procedure, in which the standard weight was judged before the comparison. In Experiments I and II a larger illusion was induced than in the original studies, but in Experiment III both the weights and container sizes were practically identical to those used by Ross and Gregory. The procedure was also the same as their most successful procedure (number 3) in which standard and comparison were judged simultaneously. The findings were uniformly negative: there was no evidence of criterion shift when the size-weight illusion was induced nor did we find the lowering of threshold previously reported.  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