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   85861篇
  免费   3478篇
  国内免费   38篇
  2020年   1016篇
  2019年   1213篇
  2018年   1691篇
  2017年   1779篇
  2016年   1823篇
  2015年   1306篇
  2014年   1574篇
  2013年   7231篇
  2012年   2896篇
  2011年   2899篇
  2010年   1795篇
  2009年   1807篇
  2008年   2553篇
  2007年   2556篇
  2006年   2292篇
  2005年   1974篇
  2004年   1961篇
  2003年   1863篇
  2002年   1825篇
  2001年   2751篇
  2000年   2582篇
  1999年   1984篇
  1998年   936篇
  1997年   845篇
  1996年   892篇
  1995年   837篇
  1994年   808篇
  1993年   821篇
  1992年   1656篇
  1991年   1503篇
  1990年   1543篇
  1989年   1420篇
  1988年   1436篇
  1987年   1328篇
  1986年   1326篇
  1985年   1329篇
  1984年   1141篇
  1983年   1029篇
  1979年   1225篇
  1978年   889篇
  1975年   983篇
  1974年   1099篇
  1973年   1149篇
  1972年   938篇
  1971年   887篇
  1970年   778篇
  1969年   808篇
  1968年   1012篇
  1967年   907篇
  1966年   799篇
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
261.
M Verkuyten 《Adolescence》1988,23(92):863-871
This article examines the question of how the lack of differences in general self-esteem between adolescents of ethnic minorities and Dutch adolescents can be explained. Attention is focused on the reflected appraisal process. It was found that for adolescents of ethnic minorities there is a significant relationship between general self-esteem and the perceived evaluation of family members, and no such relationship with nonfamily members. For the Dutch adolescents the findings are the opposite, which may explain why adolescents of ethnic minorities in general do not have lower general self-esteem, despite low status, prejudice, and discrimination.  相似文献   
262.
263.
264.
265.
Context and structure in conceptual combination   总被引:8,自引:0,他引:8  
  相似文献   
266.
267.
The care of the patient with cancer requires the development not only of a medical plan, but an ethical plan as well. This plan should integrate the physician's and the patient's perceptions of medical and ethical propriety. Jewish biomedical ethical principles are based on the teaching of the Old Testament and its various interpretations. In this paper, I discuss how these principles can be used to help guide the physician caring for the patient with cancer. Other ethical systems could be applied in a similar fashion.  相似文献   
268.
269.
Survey respondents may inaccurately report mental health service utilization for motivational and cognitive reasons. There is little evidence on accuracy of self-reports of mental health service use, and this evidence suggests that respondents tend to underreport inpatient utilization. This study addressed the question of self-report accuracy by comparing survey data from a large probability sample to data from computerized records of publicly funded mental health services. Few inaccuracies in self-reporting were detected. However, despite the use of data bases that were unusually appropriate for verifying self-reports, several problems limited the feasibility of validation. Suggestions are offered for increasing the feasibility of validation in future studies.  相似文献   
270.
Processing resources and age differences in working memory   总被引:1,自引:0,他引:1  
This study investigated the performance of young and old subjects on a modified version of the working memory task developed by Baddeley and Hitch (1974). Subjects were required to verify a set of sentences of varying complexity while they repeated aloud zero, two, or four words. The older subjects took longer to verify the sentences, especially when the sentences were grammatically complex, but the effect of concurrent memory load on verification latency was the same in both groups. These results cast doubt on the notion that there is an age-related decline in one general pool of processing resources. They also suggest that older people have greater difficulty with the active processing aspects, rather than with the passive holding aspects, of working memory tasks.  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