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   24905篇
  免费   902篇
  国内免费   11篇
  25818篇
  2020年   309篇
  2019年   288篇
  2018年   465篇
  2017年   515篇
  2016年   486篇
  2015年   305篇
  2014年   399篇
  2013年   1990篇
  2012年   798篇
  2011年   854篇
  2010年   524篇
  2009年   443篇
  2008年   722篇
  2007年   671篇
  2006年   606篇
  2005年   507篇
  2004年   488篇
  2003年   458篇
  2002年   489篇
  2001年   747篇
  2000年   771篇
  1999年   568篇
  1998年   271篇
  1997年   225篇
  1992年   453篇
  1991年   422篇
  1990年   449篇
  1989年   421篇
  1988年   405篇
  1987年   406篇
  1986年   410篇
  1985年   430篇
  1984年   335篇
  1983年   300篇
  1982年   241篇
  1981年   218篇
  1979年   391篇
  1978年   279篇
  1977年   252篇
  1976年   222篇
  1975年   342篇
  1974年   374篇
  1973年   353篇
  1972年   332篇
  1971年   293篇
  1970年   262篇
  1969年   324篇
  1968年   364篇
  1967年   325篇
  1966年   332篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
911.
The antidepressants desipramine and imipramine were compared within the framework of a multiclinical study performed under the conditions of a controlled clinical experiment. There has been found a time-different remission of affective symptoms, which was not detectable for the inhibition of drive. The tachythymoleptic action of desipramine is discussed with reference to these results. Evaluation of the possibility of controlling affects shows different ranges of activity of desipramine and imipramine, with desipramine influencing especially negative psychoenergetic symptoms in the area of drives and emotions and imipramine, restrictive symptoms in addition to differential phenomena of the psychomotor expression.  相似文献   
912.
The author gives a brief survey of the development of Child-Neuropsychiatry in the G.D.R. and subsequently gives reasons for the decision in favor of the unity of neurology and psychiatry as applied to children and juveniles, which is in contrast to developments in other countries. In addition to hygienic, economic, organizational, and medical considerations, this decision was also determined by the fact that a Child-Neuropsychiatrist must, in his practical work as a subspecialist, be able to head a multiprofessional team and, thus, help assure optimum development of a child's personality.  相似文献   
913.
U-statistic hierarchical clustering   总被引:2,自引:0,他引:2  
A monotone invariant method of hierarchical clustering based on the Mann-Whitney U-statistic is presented. The effectiveness of the complete-link, single-link, and U-statistic methods in recovering tree structures from error perturbed data are evaluated. The U-statistic method is found to be consistently more effective in recovering the original tree structures than either the single-link or complete-link methods.  相似文献   
914.
915.
916.
917.
The validity of Ramsey's three factor model of vocational commitment – consisting of ego-involvement (ranging from altruism to self-orientation), pre-dispositions, and occupational possibilities – is examined Although no data is provided relevant to the altruism end of the ego-involvement continuum, analyses of data from a sample of trainee nurses indicated that the three measures of self-orientation, predispositions, and occupational possibilities possessed satisfactory internal consistency and discriminant validity, thus providing support for the three-dimensional model.  相似文献   
918.
919.
A field experiment was designed in which students approached sales personnel in 31 different retail settings, asking for help in selecting toys for a twin niece and nephew, 5 years of age. A majority of salesperson suggestions involved a sex-stereotypic selection of toys for both the male and the female child. Limited support was found for hypotheses that the responses of sales personnel would vary by retail setting (specialized toystore, department store, dimestore/discount store) and by sex of salesperson; responses did not vary by salesperson's age, however. Because more different toys are available for boys than for girls, female role expansion in children's play activities is a more likely outcome than sex-role convergence.This article is a revision of a paper presented at the annual meeting of the American Sociological Association, New York, August 1976.  相似文献   
920.
This article takes a sociological approach to a problem that has usually been considered as a psychological phenomenon. It addresses the problem of male—female interactions in work situations utilizing the organizational concepts of division of labor and legitimacy. Traditional explanations evoking sex-role socialization are reviewed and rejected for purposes of experimentation and intervention. An alternative argument, focusing on the structural arrangements of organizational settings, is presented as an explanation for behavioral effects previously attributed to inherent sex differences. The results of a pilot study are briefly described, and directions for further experimentation and possible intervention strategies are suggested.The bibliographic search and initial conceptualization of this research was supported by a grant from the Ford Foundation under the auspices of the Center for Research on Women at Stanford University. We are grateful to Miriam Rosen for much of the bibliographic work. The pilot study was supported in part by funds from the Guggenheim Foundation and by a grant from the Spencer Foundation. We also wish to thank Richard Torres and Christie Timberlake for their invaluable assistance on this project.  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