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   17076篇
  免费   691篇
  国内免费   15篇
  17782篇
  2021年   134篇
  2020年   238篇
  2019年   306篇
  2018年   410篇
  2017年   404篇
  2016年   438篇
  2015年   312篇
  2014年   399篇
  2013年   1877篇
  2012年   699篇
  2011年   763篇
  2010年   463篇
  2009年   492篇
  2008年   686篇
  2007年   663篇
  2006年   676篇
  2005年   623篇
  2004年   564篇
  2003年   607篇
  2002年   600篇
  2001年   297篇
  2000年   264篇
  1999年   272篇
  1998年   236篇
  1997年   256篇
  1996年   235篇
  1995年   202篇
  1994年   202篇
  1993年   205篇
  1992年   176篇
  1991年   204篇
  1990年   177篇
  1989年   151篇
  1988年   127篇
  1987年   160篇
  1986年   160篇
  1985年   199篇
  1984年   218篇
  1983年   180篇
  1982年   184篇
  1981年   201篇
  1980年   163篇
  1979年   155篇
  1978年   156篇
  1977年   166篇
  1976年   159篇
  1975年   144篇
  1974年   157篇
  1973年   136篇
  1972年   83篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
This study examined whether Project Support, a parenting intervention shown to reduce child conduct problems, also exerts positive effects on features of psychopathy in children. Participants were 66 families (mothers and children) recruited from domestic violence shelters who participated in a randomized controlled trial evaluating Project Support. Each family included at least one child between the ages of 4 and 9 who was exhibiting clinical levels of conduct problems. Families were randomly assigned to the Project Support intervention condition or to an existing services comparison condition, and they were assessed on 6 occasions over 20 months, following their departure from the shelter. Children in families in the Project Support condition, compared with those in the comparison condition, exhibited greater reductions in features of psychopathy. Moreover, the changes in features of psychopathy remained after accounting for changes in conduct problems. Project Support’s effects on features of psychopathy were mediated by improvements in mothers’ harsh and inconsistent parenting. These findings on the effects of an intervention on features of psychopathy are the first from a randomized controlled trial. They inform the debate about whether features of psychopathy in children are responsive to intervention, and hold important implications for clinical practice.  相似文献   
992.
993.
994.
995.
996.
This review focuses on psychopathologic risk factors for adolescent suicide and suicidal behavior, namely, affective, disruptive, substance abuse, psychotic, and personality disorders. The interaction of psychopathology with age and gender is discussed. The role of family environmental risk factors and stress events in suicide and suicidal behavior, both alone, and in interaction with psychopathology are reviewed. Research reviewed will include psychological; autopsy studies, longitudinal studies examining predictors of suicide, and epidemiologic studies of suicide attempts.  相似文献   
997.
998.
It has been suggested that there is a strong relationship between suicidal behavior and homosexuality in adolescence. It has been further suggested that it is due to the stigmatization and feelings of isolation that are experienced by many gay adolescents. Much of the literature that has given support to these hypotheses has been conducted on uncontrolled nonrepresentative samples and its generalizability is open to question. An opportunity to examine the relationship in an unselected sample arose in a case control, psychological autopsy study of 120 of 170 consecutive suicides under age 20 and 147 community age, sex, and ethnic matched controls living in the Greater New York City area. Homosexuality was defined as having had homosexual experiences or having declared a homosexual orientation. Three teenagers and no controls met these criteria. The difference was not significant. The circumstances of death were examined and are described. In no instance did suicide directly follow an episode of stigmatization. All three suicides had evidence of significant psychiatric disorder before death. In spite of opportunities for biased reporting, it is concluded that this study finds no evidence that suicide is a common characteristic of gay youth, or that when suicide does occur among gay teenagers, that it is a direct consequence of stigmatization or lack of support.  相似文献   
999.
1000.
Previous research suggests that, during visual search and discrimination tasks, older adults place greater emphasis than younger adults on top-down attention. This experiment investigated the relative contribution of target activation and distractor inhibition to this age difference. Younger and older adults performed a singleton discrimination task in which either an E or an R target (colour singleton) was present among distractor letters. Relative to a baseline condition in which the colours of the targets and distractors remained constant, an age-related slowing of performance was evident when either the colour of the target or that of the distractors varied across trials. The age-related slowing was more pronounced in response to target colour variation, suggesting that older adults place relatively greater emphasis on the top-down activation of target features.  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