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   159677篇
  免费   7394篇
  国内免费   165篇
  2021年   1499篇
  2020年   2801篇
  2019年   3460篇
  2018年   3421篇
  2017年   3851篇
  2016年   4546篇
  2015年   3918篇
  2014年   4815篇
  2013年   23475篇
  2012年   4168篇
  2011年   3136篇
  2010年   3704篇
  2009年   4686篇
  2008年   3421篇
  2007年   2949篇
  2006年   3659篇
  2005年   3663篇
  2004年   3191篇
  2003年   2808篇
  2002年   2607篇
  2001年   2685篇
  2000年   2544篇
  1999年   2747篇
  1998年   2758篇
  1997年   2618篇
  1996年   2539篇
  1995年   2370篇
  1994年   2344篇
  1993年   2297篇
  1992年   2250篇
  1991年   2121篇
  1990年   1946篇
  1989年   1912篇
  1988年   1874篇
  1987年   1908篇
  1986年   1883篇
  1985年   2102篇
  1984年   2310篇
  1983年   2129篇
  1982年   2299篇
  1981年   2277篇
  1980年   2117篇
  1979年   1933篇
  1978年   2033篇
  1977年   2045篇
  1976年   1821篇
  1975年   1773篇
  1974年   1795篇
  1973年   1634篇
  1972年   1264篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
111.
OBJECTIVE: To test a theoretical model of how ethnic pride and self-control are related to risk and protective factors. DESIGN: A community sample of 670 African American youth (mean age = 11.2 years) were interviewed in households. MAIN OUTCOME MEASURES: Measures of cigarette smoking, alcohol use, and sexual behavior (lifetime to past month). RESULTS: Structural modeling analyses indicated parenting was related to self-control and self-esteem, and racial socialization was related to ethnic pride. Self-control and self-esteem variables were related to levels of deviance-prone attitudes and to perceptions of engagers in, or abstainers from, substance use and sexual behavior. The proximal factors (behavioral willingness, resistance efficacy, and peer behavior) had substantial relations to the criterion variables. Participant gender and parental education also had several paths in the model. Results were generally similar for the 2 outcome behaviors. CONCLUSIONS: In this population, self-esteem and self-control are related to parenting approaches and have pathways to attitudes and social perceptions that are significant factors for predisposing to, or protecting against, early involvement in substance use and sexual behavior.  相似文献   
112.
113.
Three experiments, each using a single group of pigeons, are reported. In Experiment 1 subjects were initially trained with two stimuli, one of which was always followed by food, the other being reinforced according to a 50% partial reinforcement schedule. Subsequently a serial procedure was adopted in which an additional stimulus, C, was consistently followed by the partially reinforced CS. A second additional stimulus, A, was followed on half of its occurrences by the continuously reinforced CS, its remaining presentations being followed by nothing. The rate of autoshaped keypecking was substantially greater during A than during C. In the remaining experiments subjects received first-order conditioning with a single stimulus that was either partially (Experiment 2) or continuously (Experiment 3) reinforced. The stimuli A and C were then again introduced for serial autoshaping. Stimulus A was occasionally paired with the CS and occasionally followed by nothing, whereas stimulus C was always followed by the CS. As in Experiment 1, the rate of responding during A was greater than during C. It is proposed that one influence on the rate of autoshaped keypecking during a CS is the accuracy with which the immediate consequences of that CS are predicted.  相似文献   
114.
ABSTRACT In this essay the argument set forth by Michael Levin regarding the abnormality of homosexual behaviour is reviewed and criticized. Against his argument which holds that homosexual behaviour is abnormal because it constitutes an evolutionary aberration, I argue that Levin's and all similarly constructed arguments fail to show that evolutionary origins of sexual behaviour have any significant normative force. I contend that his notion of homosexuality is confused and that he fails to consider alternative methods of how homosexuality might have indeed served evolutionary adaptive purposes or been the result of surplus adaptations. I argue, too, that Levin's linking of unhappiness with homosexual behaviour is spurious and ill-supported. Consequently, I reject Levin's claims that public policy ought to do what it can to minimize the incidence of such behaviour. I argue by contrast that if happiness is the end of public policy decisions, then society ought to take what measures it can to protect persons in respect of their homosexual behaviour and identities.  相似文献   
115.
116.
117.
118.
119.
120.
The intuition that we have privileged and unrestricted access to ourselves – that we inevitably know who we are, how we feel, what we do, and what we think – is very compelling. Here, we review three types of evidence about the accuracy of self-perceptions of personality and conclude that the glass is neither full nor empty. First, studies comparing self-perceptions of personality to objective criteria suggest that self-perceptions are at least tethered to reality – people are not completely clueless about how they behave, but they are also far from perfect. Second, studies examining how well people’s self-perceptions agree with others’ perceptions of them suggest that people’s self-views are not completely out of synch with how they are seen by those who know them best, but they are also far from identical. Third, studies examining whether people know the impressions they make on others suggest that people do have some glimmer of insight into the fact that others see them differently than they see themselves but there is still a great deal people do not know about how others see them. The findings from all three approaches point to the conclusion that self-knowledge exists but leaves something to be desired. The status of people’s self-knowledge about their own personality has vast implications both for our conception of ourselves as rational agents and for the methods of psychological inquiry.  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