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   44271篇
  免费   937篇
  国内免费   11篇
  45219篇
  2020年   316篇
  2019年   327篇
  2018年   3800篇
  2017年   3168篇
  2016年   2631篇
  2015年   518篇
  2014年   481篇
  2013年   1982篇
  2012年   1306篇
  2011年   3101篇
  2010年   2910篇
  2009年   1892篇
  2008年   2299篇
  2007年   2758篇
  2006年   606篇
  2005年   718篇
  2004年   673篇
  2003年   551篇
  2002年   558篇
  2001年   774篇
  2000年   804篇
  1999年   584篇
  1998年   291篇
  1997年   241篇
  1992年   457篇
  1991年   412篇
  1990年   458篇
  1989年   422篇
  1988年   401篇
  1987年   405篇
  1986年   412篇
  1985年   426篇
  1984年   342篇
  1983年   304篇
  1982年   248篇
  1981年   215篇
  1979年   389篇
  1978年   280篇
  1977年   253篇
  1976年   225篇
  1975年   341篇
  1974年   375篇
  1973年   352篇
  1972年   331篇
  1971年   287篇
  1970年   260篇
  1969年   323篇
  1968年   358篇
  1967年   322篇
  1966年   325篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
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   
4.
5.
6.
Subjects in five experiments read nine-digit memory lists from a cathode ray tube for immediate recall. Reading aloud always produced a localized and reliable advantage for the last item, compared to reading silently. Two experiments on whispered and mouthed lists, with or without simultaneous broadband noise, falsified expectations derived from the theory of precategorical acoustic storage. Three additional experiments showed no enhancement of recency in the silent conditions when the digits were drawn or spelled gradually on the screen, a result that is inconsistent with the changing-state hypothesis. The classic auditory-visual modality effect is large and reliable, but still poorly understood.  相似文献   
7.
8.
9.
This study evaluated cardiovascular responses (CVR) to an active speech task with blatantly discriminatory (BRC) versus neutral (NRC) stimuli and an anger recall task in a sample of Black men (N = 73; age 18 to 47). Diastolic blood pressure scores were higher for NRC versus BRC stimuli during anger recall (p = .05). Moreover, persons in the NRC group who perceived high levels of racism (vs. no racism or BRC group) during active speech showed larger increases in blood pressure across postspeech rest, anger recall, and subsequent rest (p = .03). The notable elevation in CVR in response to an ambiguous event extends current models of racism suggesting that subtle racism is a psychosocial stressor that erodes health through chronically elevated CVR.  相似文献   
10.
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