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   60020篇
  免费   2346篇
  国内免费   22篇
  2020年   682篇
  2019年   804篇
  2018年   1244篇
  2017年   1233篇
  2016年   1368篇
  2015年   949篇
  2014年   1070篇
  2013年   4912篇
  2012年   2177篇
  2011年   2152篇
  2010年   1168篇
  2009年   1212篇
  2008年   1700篇
  2007年   1658篇
  2006年   1540篇
  2005年   2459篇
  2004年   1858篇
  2003年   1625篇
  2002年   1278篇
  2001年   1942篇
  2000年   1805篇
  1999年   1359篇
  1998年   621篇
  1997年   534篇
  1996年   610篇
  1995年   553篇
  1994年   556篇
  1993年   533篇
  1992年   1125篇
  1991年   1051篇
  1990年   1049篇
  1989年   996篇
  1988年   957篇
  1987年   902篇
  1986年   891篇
  1985年   931篇
  1984年   750篇
  1983年   648篇
  1979年   790篇
  1978年   573篇
  1975年   628篇
  1974年   709篇
  1973年   732篇
  1972年   627篇
  1971年   579篇
  1970年   500篇
  1969年   493篇
  1968年   629篇
  1967年   546篇
  1966年   522篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
201.
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   
202.
203.
204.
205.
206.
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   
207.
208.
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   
209.
Some models of the lexicon predict that recognition of words should produce activation spreading to phonologically related words. Consistent with this prediction, Hillinger (1980) demonstrated priming in a visual lexical decision task for word targets preceded by graphemically similar or graphemically dissimilar primes that rhymed with the target. In Experiment 1, we investigated whether this phonological priming effect occurred automatically or because of subject strategies. Although semantically associated primes produced significant facilitation in Experiment 1, no evidence of phonological priming was obtained. Experiments 2 to 5 were conducted in an attempt to obtain the phonological priming effect. Experiment 5 was a replication of one of Hillinger’s experiments. In none of these experiments was phonological priming observed. These results indicate either that the lexicon is not organized such that spreading activation occurs on the basis of phonological similarity, or that visual lexical decisions are made without phonological mediation.  相似文献   
210.
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