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   33370篇
  免费   585篇
  国内免费   44篇
  33999篇
  2023年   72篇
  2021年   118篇
  2020年   213篇
  2019年   262篇
  2018年   3724篇
  2017年   3083篇
  2016年   2541篇
  2015年   448篇
  2014年   413篇
  2013年   1586篇
  2012年   1142篇
  2011年   2950篇
  2010年   2814篇
  2009年   1841篇
  2008年   2198篇
  2007年   2655篇
  2006年   591篇
  2005年   720篇
  2004年   636篇
  2003年   606篇
  2002年   543篇
  2001年   272篇
  2000年   269篇
  1999年   235篇
  1998年   220篇
  1997年   229篇
  1996年   202篇
  1995年   170篇
  1994年   163篇
  1993年   155篇
  1992年   142篇
  1991年   152篇
  1990年   142篇
  1989年   120篇
  1988年   88篇
  1987年   120篇
  1986年   127篇
  1985年   163篇
  1984年   160篇
  1983年   138篇
  1982年   131篇
  1981年   143篇
  1980年   124篇
  1979年   108篇
  1978年   118篇
  1977年   108篇
  1976年   108篇
  1975年   94篇
  1974年   104篇
  1973年   85篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
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   
972.
Jerzy Gołosz 《Axiomathes》2018,28(4):395-417
The aim of this paper is to make presentism a dynamic view of reality by basing it on a notion of dynamic existence, that is, on a notion of existence which has a dynamic character. The paper shows that both of the notions of existence which are used in metaphysical theories of time (in presentism and eternalism) have a static character and, while such a notion is useful for eternalists, it is useless for presentists if they want to make their view able to remain in agreement with our everyday experience and self-consistent. It is demonstrated that both empirical and theoretical arguments indicate that the presentist should replace the notion of this static existence with the notion of a dynamic existence and that this maneuver allows the presentist to treat his/her existential thesis as equivalent to the thesis that time flows. Not only does this strategy allow us to express presentism in a simple, homogenous way which remains in agreement with our experience, but also permits us to solve some of the difficult problems which presentism faces, such as, for example, the objection of triviality and the question about the rate of time passage. Moreover, such an approach to presentism allows us to solve fundamental metaphysical problems concerning time such as the problem of the openness of the future and the fixity of the past, direction of causation, and relations between presentism and persistence through time by endurance.  相似文献   
973.
974.
975.
976.
977.
978.
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   
979.
980.
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   
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