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   42301篇
  免费   1730篇
  国内免费   22篇
  2020年   448篇
  2019年   484篇
  2018年   767篇
  2017年   748篇
  2016年   790篇
  2015年   548篇
  2014年   706篇
  2013年   3278篇
  2012年   1218篇
  2011年   1290篇
  2010年   743篇
  2009年   797篇
  2008年   1060篇
  2007年   1122篇
  2006年   999篇
  2005年   917篇
  2004年   845篇
  2003年   836篇
  2002年   845篇
  2001年   1440篇
  2000年   1384篇
  1999年   1060篇
  1998年   442篇
  1997年   391篇
  1996年   408篇
  1992年   880篇
  1991年   831篇
  1990年   853篇
  1989年   767篇
  1988年   771篇
  1987年   716篇
  1986年   752篇
  1985年   794篇
  1984年   635篇
  1983年   543篇
  1982年   412篇
  1981年   391篇
  1979年   658篇
  1978年   495篇
  1977年   420篇
  1975年   555篇
  1974年   696篇
  1973年   701篇
  1972年   552篇
  1971年   511篇
  1970年   465篇
  1969年   465篇
  1968年   614篇
  1967年   546篇
  1966年   543篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
The validity of a primate dominance hierarchy was examined in terms of its relationship to social interactions. Twelve social behaviors associated with dominance and aggression were recorded during 61 h of observation of six pigtail macaques (Macaca nemestrina). Of the 1,462 interactions recorded, 94.7% were oriented in the water dominance hierarchy in the direction that would be predicted on the basis of their ascribed functions.  相似文献   
993.
The Rockefeller University, New York, New York 10021 Events such as barpresses or licks, which may occur at any time during the day, are often clustered into bouts. The internal structure of such bouts can be recorded using an AM tape recorder, running the tape recorder only while bouts are in progress, and can later be analyzed off-line on a digital computer.  相似文献   
994.
An investigation is reported into pausing and grouping during the serial learning of letter strings, when presented randomly by length and when presented in ascending order. Mean pause times for the reading and recall of longer lists were significantly greater than for lists of shorter span due to extended pausing at specific list positions. In general, reading rhythms were duplicated during recall. Subjects were highly consistent in maintaining their level of pause duration across lists and responded to additions in list length by increasing their number of groups, not by increasing group size. Triadic sequences were the most popular form of spontaneous organization. Pausing measures are discussed as indices of organizational strategies.  相似文献   
995.
996.
997.
A discriminated Sidman avoidance procedure used by Forgione (1970) was replicated using a head-poke response instead of a leverpress as the avoidance operant. The resultant data were described in terms of the five dependent measures reported by Forgione. Head-poke avoidance was found to be more efficient than its leverpress counterpart and compared very favorably with the lever-disabling (or shock-timer-on) procedure used by Forgione to break up inefficient leverpress behavior patterns.  相似文献   
998.
This article supplements the ideas on counseling and the social revolution which appeared in the May 1971 P&G—especially regarding the common behavior models of the counselor and the change agent. Because adherence to a model often places a counselor in jeopardy, the authors call on the profession to offer support and leadership on a national level to those counselors who wish to act as change agents.  相似文献   
999.
1000.
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