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   77149篇
  免费   3148篇
  国内免费   49篇
  80346篇
  2020年   859篇
  2019年   1073篇
  2018年   1524篇
  2017年   1520篇
  2016年   1616篇
  2015年   1091篇
  2014年   1345篇
  2013年   6494篇
  2012年   2451篇
  2011年   2583篇
  2010年   1537篇
  2009年   1623篇
  2008年   2308篇
  2007年   2284篇
  2006年   2036篇
  2005年   1812篇
  2004年   1794篇
  2003年   1612篇
  2002年   1679篇
  2001年   2487篇
  2000年   2428篇
  1999年   1851篇
  1998年   927篇
  1997年   818篇
  1996年   752篇
  1995年   764篇
  1993年   745篇
  1992年   1477篇
  1991年   1398篇
  1990年   1365篇
  1989年   1255篇
  1988年   1236篇
  1987年   1171篇
  1986年   1180篇
  1985年   1264篇
  1984年   1017篇
  1983年   894篇
  1982年   733篇
  1979年   1034篇
  1978年   764篇
  1976年   715篇
  1975年   870篇
  1974年   1003篇
  1973年   986篇
  1972年   878篇
  1971年   766篇
  1969年   719篇
  1968年   904篇
  1967年   859篇
  1966年   776篇
排序方式: 共有10000条查询结果,搜索用时 33 毫秒
21.
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   
22.
Brain mapping studies using dynamic imaging methods demonstrate areas regional cerebral blood flow (rCBF) decreases, as well as areas where increases, during performance of various experimental tasks. Task holds for both sets of cerebral blood flow changes (CBF), providing the opportunity to investigate areas that become and “activated” in the experimental condition relative to control state. Such data yield the intriguing observation that in areas in emotional processing, such as the amygdala, the posteromedial cortex, and the ventral anterior cingulate cortex, although flow as expected during specific emotion-related tasks, flow decreases performance of some attentionally demanding, cognitive tasks. Conversely, in some of the areas that appear to subserve cognitive functions, as the dorsal anterior cingulate and the dorsolateral prefrontal cortices, increases while performing attentionally demanding cognitive tasks, but during some experimentally induced and pathological emotional Although the specific nature of such reciprocal patterns of regional remains unclear, they may reflect an important cross-modal interaction during mental operations. The possibility that neural activity is less in areas required in emotional processing during some higher cognitive processes holds implications for the mechanisms underlying interactions cognition and emotion. Furthermore, the possibility that neural in some cognitive-processing areas is suppressed during intense states suggests mechanisms by which extreme fear or severe may interfere with cognitive performance.  相似文献   
23.
24.
25.
26.
The essay examines intellectual virtue in the Summa theologiae, taking it as an interpretative key to the epistemology of the Summa theologiae as a whole. Because Aquinas blurs the line between the acquired and the theological virtues, and between virtues and the gifts of the Spirit, it becomes impossible to maintain the distinction between the realms of nature and grace, or between natural reason and revealed truth: grace permeates the most ordinary activities of human reasoning. This reading of the Summa theologiae raises questions about many contemporary debates, particularly those concerning natural law.  相似文献   
27.
28.
29.
30.
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