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   100072篇
  免费   3975篇
  国内免费   44篇
  104091篇
  2020年   1028篇
  2019年   1316篇
  2018年   1838篇
  2017年   1866篇
  2016年   1967篇
  2015年   1374篇
  2014年   1660篇
  2013年   8055篇
  2012年   3035篇
  2011年   3304篇
  2010年   2035篇
  2009年   2041篇
  2008年   2971篇
  2007年   2963篇
  2006年   2683篇
  2005年   2391篇
  2004年   2283篇
  2003年   2126篇
  2002年   2252篇
  2001年   3184篇
  2000年   3065篇
  1999年   2349篇
  1998年   1219篇
  1997年   1077篇
  1996年   1023篇
  1995年   958篇
  1993年   975篇
  1992年   1960篇
  1991年   1857篇
  1990年   1807篇
  1989年   1646篇
  1988年   1619篇
  1987年   1561篇
  1986年   1641篇
  1985年   1684篇
  1984年   1408篇
  1983年   1226篇
  1982年   947篇
  1979年   1432篇
  1978年   1059篇
  1975年   1220篇
  1974年   1291篇
  1973年   1378篇
  1972年   1196篇
  1971年   1076篇
  1970年   963篇
  1969年   997篇
  1968年   1271篇
  1967年   1177篇
  1966年   1017篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
972.
973.
974.
To compare the relative effectiveness of three compliance techniques during a museum fund-raising drive, 89 individuals were asked to contribute $1 to the museum after having been exposed to an initial request according to one of the following conditions: (1) in the foot-in-thedoor condition, individuals were first asked to sign a petition in support of the museum; (2) in the door-in-the-face condition, they were initially asked for a $5 contribution; (3) in the. low-ball condition, they were asked to contribute 75 cents and then to increase this amount by 25 cents in order to support the children's program: and (4) in the control condition, subjects simply received the target request for $1. The groups differed significantly in terms of the number of individuals who donated, and in the amount of their contributions. The low-ball condition was generally the most effective, especially with respect to the amount of money contributed. This was followed in turn by the door-in-the-face and control conditions, with the foot-in-the-door condition the least effective in virtually every comparison. These findings are discussed in terms of their implications for the experimental analysis of compliance, as well as the development of more effective fund-raising programs.  相似文献   
975.
976.
We evaluated a procedure for identifying potential reinforcers with profoundly retarded individuals. In Experiment 1, six persons were repeatedly exposed to 16 stimuli, and approach behaviors to each stimulus were used to identify preferred and nonpreferred stimuli. In Experiment 2, we examined the reinforcing properties of preferred and nonpreferred stimuli by delivering them contingently on the occurrence of arbitrarily selected responses. Results revealed that the preferred stimulus conditions typically produced higher rates of responding than did either the baseline or the nonpreferred stimulus conditions, suggesting that the procedure can be used to assess reinforcer value for individuals with limited behavioral repertoires.  相似文献   
977.
978.
This article illustrates the ways in which clients in career counseling think about the types of change in their career lives and about the determinants of change. It is based on an analysis of the interview data of a few adult clients. Two category systems are proposed as representative of the clients' thinking about change in these domains.  相似文献   
979.
We evaluated methods for comparing the effects of dextroamphetamine (Dexedrine), thioridazine (Mellaril), and contingency management in the control of severe behavior problems. A reversal design was used in which medications were systematically titrated and assessed in unstructured as well as structured settings with three clients. Subsequently, behavioral procedures including timeout, differential reinforcement of other behavior, and visual screening, were used in a multiple-baseline design across settings. The assessment and design methods were useful in comparing the interventions. Dextroamphetamine decreased inappropriate behaviors and improved academic behaviors in one client, but no reliable effects were observed in the other two clients. Thioridazine was variable across clients, settings, behaviors, and dosages. Contingency management produced consistent decreases in inappropriate behaviors and small improvements in academic performance.  相似文献   
980.
Tapping rate and variability were measured as 73 normal, right-handed children in Grades 1–4 engaged in speeded unimanual finger tapping with and without concurrent recitation. Speaking reduced the rate of tapping and increased its variability to a greater extent in younger children than in older children. Developmental changes in variability but not rate were attributable to a greater number of lengthy (>500 ms) pauses in the tapping of younger children. Speaking slowed the right hand more than the left, and the degree of this asymmetry was constant across grade levels. The right-hand effect for tapping rate was not attributable to lengthy pauses. In contrast, asymmetric increases in tapping variability occurred only among children in Grade 1 and only when lengthy pauses were included in the data. The results implicate three mechanisms of intertask interference: one involving capacity limitations, a second involving cross-talk between motor control mechanisms for speech and finger movement, respectively, and a third factor involving occasional diversion of attention from tapping to speaking. These mechanisms are discussed in relation to developmental changes in mental capacity.  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