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   206007篇
  免费   8777篇
  国内免费   160篇
  2020年   2827篇
  2019年   3492篇
  2018年   3880篇
  2017年   4304篇
  2016年   4888篇
  2015年   3959篇
  2014年   4839篇
  2013年   23637篇
  2012年   5465篇
  2011年   4898篇
  2010年   4404篇
  2009年   4996篇
  2008年   4994篇
  2007年   4543篇
  2006年   4887篇
  2005年   4754篇
  2004年   4204篇
  2003年   3875篇
  2002年   3712篇
  2001年   4800篇
  2000年   4604篇
  1999年   4068篇
  1998年   2987篇
  1997年   2778篇
  1996年   2686篇
  1995年   2511篇
  1994年   2488篇
  1993年   2417篇
  1992年   3409篇
  1991年   3227篇
  1990年   3145篇
  1989年   2986篇
  1988年   2949篇
  1987年   2908篇
  1986年   2910篇
  1985年   3140篇
  1984年   3039篇
  1983年   2697篇
  1982年   2547篇
  1981年   2504篇
  1980年   2339篇
  1979年   2810篇
  1978年   2517篇
  1977年   2396篇
  1976年   2225篇
  1975年   2575篇
  1974年   2735篇
  1973年   2694篇
  1972年   2168篇
  1968年   2030篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
The present study tested gender as a moderator of the relationship between race-related stress and mental health symptoms among African American adults. Because African American women are exposed to stressors associated with race and gender, we hypothesized that African American women would have higher levels of race-related stress and more severe mental health outcomes related to experiences of race-related stress compared to African American men. Multivariate analyses revealed that African American men had higher stress appraisals for institutional racism than did women. No significant gender differences were found for cultural and individual racism. Moderated regression analyses revealed that increases in stress appraisals for individual racism were associated with increases in anxiety and obsessive-compulsive symptoms for African American women. Race-related stress had no significant effects on mental health symptoms for African American men. The findings suggest that gender is an important factor in determining the impact of race-related stress on mental health.  相似文献   
4.
Four experiments are described which aim to distinguish the relative contributions of measures of semantic distance based on formal and normative criteria. Experiment I replicates a previous finding by Collins and Quillian (1969) that sentence confirmation RTs support a hierarchically-organised memory model. Experiments II and III minimised the role of syntactic processes and examined the times taken to “see the relationship” between pairs of concepts. The results also supported a hierarchical model but cast doubt upon the formal distinction between superset and property relationships. Experiment IV showed similar results using only property relationships of the “has” form. Multiple regression analyses of the data indicate that “number of intervening links” is a more consistent predictor of RT than “associative” measures of semantic relatendness and confirm strong linearity effects consistent with a hierarchical model of storage.  相似文献   
5.
6.
7.
8.
9.
10.
The special composition question asks, roughly, under what conditions composition occurs. The common sense view is that composition only occurs among some things and that all and only ‘ordinary objects’ exist. Peter van Inwagen has marshaled a devastating argument against this view. The common sense view appears to commit one to giving what van Inwagen calls a ‘series‐style answer’ to the special composition question, but van Inwagen argues that series‐style answers are impossible because they are inconsistent with the transitivity of parthood. In what follows I answer this objection in addition to other, less troubling objections raised by van Inwagen.  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