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   35355篇
  免费   654篇
  国内免费   14篇
  2023年   82篇
  2021年   127篇
  2020年   247篇
  2019年   299篇
  2018年   3759篇
  2017年   3120篇
  2016年   2587篇
  2015年   485篇
  2014年   462篇
  2013年   1849篇
  2012年   1221篇
  2011年   3021篇
  2010年   2860篇
  2009年   1883篇
  2008年   2261篇
  2007年   2735篇
  2006年   658篇
  2005年   786篇
  2004年   695篇
  2003年   658篇
  2002年   620篇
  2001年   306篇
  2000年   306篇
  1999年   264篇
  1998年   250篇
  1997年   259篇
  1996年   230篇
  1995年   187篇
  1994年   188篇
  1993年   177篇
  1992年   167篇
  1991年   173篇
  1990年   159篇
  1989年   137篇
  1988年   102篇
  1987年   130篇
  1986年   148篇
  1985年   179篇
  1984年   187篇
  1983年   164篇
  1982年   161篇
  1981年   169篇
  1980年   150篇
  1979年   129篇
  1978年   147篇
  1977年   132篇
  1976年   129篇
  1975年   109篇
  1974年   124篇
  1973年   108篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
231.
Subjects named alphabetic characters that had been rotated, reflected, or inverted. Inversions induce more errors than mirror reflections and reflections induce more than rotations. In a significant number of mistakes a transformed character was assumed to be normally oriented, but in most a transformed character was confused with the mirror image of the original. The data suggest the existence of an “orientation set” in which the identiflcation of ambiguous characters depends largely on their anticipated orientation. The individuality of the data for the different orientations suggests that different transformations are compensated for in part by different mechanisms.  相似文献   
232.
When Ss had to indicate if the colors of pairs of items from the Stroop test were the same or different, the usual interference effect was completely eliminated. However, when the verbal information consisted of SAME and DIFF rather than color names, interference was reestablished. This indicates that the perceptual comparison task does not eliminate interference simply by rendering Ss insensitive to the meanings of words.  相似文献   
233.
Experimental control of superstitious responding in humans   总被引:8,自引:7,他引:1       下载免费PDF全文
Superstitions were demonstrated with human subjects when presses on one button were reinforced on a VI 30-sec schedule while presses on a second were never reinforced. Superstitious responding, on the second button, was often maintained because presses on that button were frequently followed by reinforcement for a subsequent press on the first button. The introduction of a changeover delay (COD), which separated in time presses on the second button and subsequent reinforced presses on the first button, reduced or eliminated the superstitious responding of these subjects. Some complex superstitions were also demonstrated with other subjects for which the COD was in effect from the beginning of the session.  相似文献   
234.
Increased eating in rats deprived of running   总被引:2,自引:1,他引:1       下载免费PDF全文
Daily food intake in rats was temporarily reduced by the introduction of an activity wheel and temporarily increased by the subsequent removal of the wheel. When this outcome is coupled with the positive relation between food deprivation and running—and food deprivation is seen as a loss of eating rather than as a physiological state—there is the suggestion that the total behavior output of the organism may be regulated as such. Specifically, when the rat is deprived of a behavior that recurrently comprises a large part of its total daily activity, an increase may occur in some other behavior.  相似文献   
235.
236.
Summary Studies of motion-detection by fish reveal two separate processes, which are hypothetically linked to different kinds of behavior. Furthermore, studies of interocular transfer with mirror-image shape discriminations also indicate two distinct mechanisms for the representation of visual directions. From these two kinds of experiment, it seems that visual processes subserving orientation of the fish to a moving object should be clearly distinguished from processes by which the fish evaluates the identity or activity of the object.
Zusammenfassung Untersuchungen der Bewegungswahrnehmung von Fischen zeigen zwei verschiedene Prozesse auf, die mit zwei verschiedenen Verhaltensweisen in Beziehung gesetzt werden. Eine Analyse des interokularen Transfers mit Unterscheidung spiegelbildlicher Formen läßt außerdem erkennen, daß zwei verschiedene Mechanismen für die Repräsentation visueller Richtungen verantwortlich sind. Aus diesen Experimenten wird geschlossen, daß jene visuellen Prozesse, welche der Orientierung des Fisches in bezug auf ein sich bewegendes Objekt dienen, scharf unterschieden werden sollten von denen, durch welche der Fisch die Identität oder Aktivität des Objektes beurteilt.
  相似文献   
237.
Modifications of the intake procedure usually employed in counseling settings were adopted in order to provide students the opportunity for immediate contact with a counselor. Elimination of the waiting list, reduction in number of missed appointments, and reduction of length of counseling came about. Staff satisfaction with the new approach has been high and there would be opposition to reverting to the scheduled initial interview. Possible changes in the type of problem or clients' readiness for problem-solving were observed.  相似文献   
238.
97 parent-daughter pairs and 80 parent-son pairs were administered a value-orientation instrument when the children were in junior high school and again 2 years later. Girls became more concerned with what they could give of themselves in their eventual work. Girls' parents began to stress home-making qualities. Boys became less concerned with the more tangible rewards of work and more concerned with utilizing their capabilities. Boys' parents rated all the values more important than did their sons. Boys and their parents evidenced more disagreement regarding values than did girls and their parents. However, when focusing on the most important value, there is considerable agreement between children and parents. Parents have remained consistent in their value ratings over the 2 years while children have changed their ratings in the direction of the values their parents hold for them. The children of parents who have changed their value ratings were not different from children of parents who remained consistent in the ratings. Nor were children who changed their value ratings different from those whose values were stable.  相似文献   
239.
240.
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