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   39759篇
  免费   1553篇
  国内免费   11篇
  41323篇
  2020年   442篇
  2019年   501篇
  2018年   735篇
  2017年   711篇
  2016年   791篇
  2015年   541篇
  2014年   642篇
  2013年   3895篇
  2012年   1141篇
  2011年   1203篇
  2010年   757篇
  2009年   650篇
  2008年   1092篇
  2007年   928篇
  2006年   893篇
  2005年   715篇
  2004年   668篇
  2003年   681篇
  2002年   649篇
  2001年   1188篇
  2000年   1158篇
  1999年   881篇
  1996年   503篇
  1995年   470篇
  1994年   468篇
  1993年   435篇
  1992年   904篇
  1991年   808篇
  1990年   809篇
  1989年   714篇
  1988年   718篇
  1987年   698篇
  1986年   692篇
  1985年   681篇
  1984年   602篇
  1983年   500篇
  1982年   390篇
  1981年   410篇
  1979年   566篇
  1978年   430篇
  1975年   525篇
  1974年   518篇
  1973年   583篇
  1972年   556篇
  1971年   498篇
  1970年   439篇
  1969年   423篇
  1968年   534篇
  1967年   454篇
  1966年   443篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
992.
993.
This paper shows how the concept of an incidence matrix of communications can be used to define the entropy of a finite scheme. The properties of the entropy function are examined and the function is found to be best interpreted as a total expected participation index. Data is presented showing the relationship between structural centrality and the new total expected participation index. In general, as the network becomes more centralized the smaller the value of the participation index and as the network becomes more structurally decentralized the greater the participation index.This research was supported in part by Ford Foundation Grant 1-40055 to the Graduate School of Industrial Administration at Carnegie Institute of Technology for Research in Organizational Behavior.The author wishes to acknowledge the aid of Terry B. Marbach in the preparation of data.  相似文献   
994.
When 72 male students in a southern theological institution were compared by the manner in which they intended to fulfill their religious vocation (i.e., as missionaries, pastors, or religious education workers), a homogeneity of personality behavior was observed on each of 16 factors. The total sample, however, was reported to be substantially and significantly different from the general population on four factors. No significant difference was reported among the three groups in their need for social approval as measured by the Marlowe-Crowne SDS.  相似文献   
995.
Factual and subjective data gathered from counseling centers in 36 major universities is presented to show present conditions, emphasis, and needs of the future. Data are presented showing ratios of counselors to students, budget allotments, strengths, specific weaknesses, etc. Counseling facilities, services provided, emphasis, communications and plans for expansion are dealt with individually. Less than half the centers were meeting student needs and a majority indicated a shortage of professional staff, particularly those competent to do personal adjustment counseling.  相似文献   
996.
In order to test the adequacy of Holland's theory of vocational choice with reference to a broad segment of entering college students, a sample of the freshman class entering the Pennsylvania State University evaluated themselves in terms of the six personality styles of Holland's theory. Relationships between the personality styles and vocational choices were studied for groups of Decided, Tentative, and Undecided students. While several inversions in the data are evident, the data possess sufficient consistency to indicate that the personality identifications these students made in Holland's frame of reference were related to their initial vocational choices.  相似文献   
997.
998.
Old (7 months of age) and young (2 months) male rats were divided into groups matched for spontaneous exploratory activity and for age. Experimental rats in the two age categories were then traumatized by giving them a 90 volt shock to the feet for two sec. on only one occasion. It was shown that nearly all the young rats recovered from the trauma within 5 weeks, as measured by brief exploratory activity and defecation, while at the end of 6 months the old rats still had not recovered. These results point up the greater resiliency of young animals, and the need for caution in the interpreting of research and theories on early experience.  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