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   206071篇
  免费   8840篇
  国内免费   160篇
  2020年   2817篇
  2019年   3491篇
  2018年   4013篇
  2017年   4335篇
  2016年   4951篇
  2015年   3966篇
  2014年   4831篇
  2013年   23582篇
  2012年   5690篇
  2011年   5148篇
  2010年   4433篇
  2009年   5050篇
  2008年   5172篇
  2007年   4745篇
  2006年   5015篇
  2005年   4837篇
  2004年   4388篇
  2003年   3980篇
  2002年   3792篇
  2001年   4822篇
  2000年   4579篇
  1999年   4083篇
  1998年   2975篇
  1997年   2777篇
  1996年   2697篇
  1995年   2516篇
  1994年   2483篇
  1993年   2423篇
  1992年   3396篇
  1991年   3198篇
  1990年   3091篇
  1989年   2949篇
  1988年   2915篇
  1987年   2830篇
  1986年   2857篇
  1985年   3106篇
  1984年   3003篇
  1983年   2684篇
  1982年   2523篇
  1981年   2471篇
  1980年   2320篇
  1979年   2783篇
  1978年   2477篇
  1977年   2366篇
  1976年   2220篇
  1975年   2480篇
  1974年   2661篇
  1973年   2612篇
  1972年   2121篇
  1971年   2012篇
排序方式: 共有10000条查询结果,搜索用时 15 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.
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   
10.
P A Kolers  M Green 《Perception》1984,13(3):249-254
Two shapes of either the same or different color will seem to be in smooth apparent motion with like-colored mates, at proper conditions of flash timing and spacing. An experiment is reported in which the condition was tested for unlike-colored pairs, for example red-green alternated with green-red. The question of interest was how the visual system would resolve the disparity of color. An 'intelligent' solution would rotate the shapes in three dimensions. Like-colored and unlike-colored parts were found to move and transform similarly, however, the resolution being dependent more upon timing than upon color. The motion of intelligence as it might be applied to vision is discussed in light of these results.  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