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   42961篇
  免费   1562篇
  国内免费   14篇
  44537篇
  2019年   446篇
  2018年   695篇
  2017年   628篇
  2016年   694篇
  2015年   515篇
  2014年   611篇
  2013年   3995篇
  2012年   1078篇
  2011年   1107篇
  2010年   692篇
  2009年   685篇
  2008年   1048篇
  2007年   961篇
  2006年   898篇
  2005年   772篇
  2004年   740篇
  2003年   744篇
  2002年   731篇
  2001年   1375篇
  2000年   1316篇
  1999年   1004篇
  1998年   451篇
  1996年   563篇
  1995年   510篇
  1994年   509篇
  1993年   497篇
  1992年   1016篇
  1991年   913篇
  1990年   926篇
  1989年   801篇
  1988年   803篇
  1987年   782篇
  1986年   786篇
  1985年   780篇
  1984年   692篇
  1983年   579篇
  1981年   463篇
  1979年   675篇
  1978年   494篇
  1976年   458篇
  1975年   603篇
  1974年   616篇
  1973年   680篇
  1972年   623篇
  1971年   573篇
  1970年   520篇
  1969年   492篇
  1968年   642篇
  1967年   534篇
  1966年   530篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
141.
T D Crespi 《Adolescence》1988,23(92):805-811
The effectiveness of a time-out intervention for adolescent psychiatric patients, adjudicated (delinquent) youth, and behaviorally disordered youngsters was explored in this study. The research was conducted in three psychiatric hospitals for children and adolescents, a facility for adjudicated youth, and in a day-treatment program. Utilizing a comparative outcome model, 813 occurrences of time-out with 274 youth were investigated in order to assess levels of effectiveness. The results indicated that time-out had a significant impact, and the use of a child-care specialist as time-out monitor improves overall effectiveness. Important implications for practicing professionals and clinical researchers are noted.  相似文献   
142.
143.
144.
145.
Context and structure in conceptual combination   总被引:8,自引:0,他引:8  
  相似文献   
146.
Two modes of learning for interactive tasks   总被引:5,自引:0,他引:5  
N A Hayes  D E Broadbent 《Cognition》1988,28(3):249-276
  相似文献   
147.
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   
148.
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   
149.
150.
The precaution adoption process   总被引:47,自引:0,他引:47  
This article presents a critique of current models of preventive behavior. It discusses a variety of factors that are usually overlooked-including the appearance of costs and benefits over time, the role of cues to action, the problem of competing life demands, and the ways that actual decision behavior differs from the rational ideal implicit in expectancy-value and utility theories. Such considerations suggest that the adoption of new precautions should be viewed as a dynamic process with many determinants. The framework of a model that is able to accommodate these additional factors is described. This alternative model portrays the precaution adoption process as an orderly sequence of qualitatively different cognitive stages. Data illustrating a few of the suggestions made in the article are presented, and implications for prevention programs are discussed.  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