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   17602篇
  免费   836篇
  国内免费   15篇
  2021年   136篇
  2020年   239篇
  2019年   258篇
  2018年   379篇
  2017年   374篇
  2016年   389篇
  2015年   302篇
  2014年   314篇
  2013年   1423篇
  2012年   594篇
  2011年   669篇
  2010年   383篇
  2009年   365篇
  2008年   498篇
  2007年   475篇
  2006年   415篇
  2005年   354篇
  2004年   357篇
  2003年   339篇
  2002年   347篇
  2001年   713篇
  2000年   717篇
  1999年   471篇
  1998年   188篇
  1997年   181篇
  1996年   144篇
  1995年   144篇
  1993年   141篇
  1992年   374篇
  1991年   329篇
  1990年   354篇
  1989年   339篇
  1988年   323篇
  1987年   294篇
  1986年   320篇
  1985年   310篇
  1984年   244篇
  1983年   207篇
  1979年   199篇
  1978年   169篇
  1975年   196篇
  1974年   243篇
  1973年   208篇
  1972年   208篇
  1971年   168篇
  1970年   151篇
  1969年   206篇
  1968年   212篇
  1967年   162篇
  1966年   181篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
A child's adjustment to wartime stress is reliant not only on individual responses and qualities, but very significantly on the availability of support that they may receive from their parent or caregivers and quality of relationships. Strengthening parental support has the potential to be valuable. A pilot two-arm randomised controlled trial investigated the feasibility of delivering and evaluating the “Caring for Children Through Conflict and Displacement” intervention with caregivers in the West Bank. Feasibility to recruit and train non-specialist staff on-the-ground to screen families for eligibility, collect outcome data, deliver the intervention and to recruit and retain families in the study were examined. Research staff and intervention facilitators were successfully appointed in the field, screened participants and delivered the intervention to 120 caregivers, collecting outcome measures pre-and post-delivery. All families completed the outcome measures, with very little missing data. This indicated that the intervention can be delivered feasibly and evaluated with families in this humanitarian context. Preliminary outcome data showed promise that the intervention may have the potential to both improve family functioning and reduce children's problem behaviour. Implications of family-focused initiatives, particularly within a conflict/post-conflict context for the prevention of several negative health and social outcomes directions, are discussed.  相似文献   
12.
13.
14.
15.
16.
17.
In three experiments we studied the relationship between contextual conditioning and the reinstatement of extinguished lever pressing that occurs when noncontingent food is introduced following extinction. In all three experiments the non-contingent food was presented off-baseline (with the response levers not present). On subsequent tests, with the response levers present, animals that had been exposed to food showed more reinstatement of lever pressing than control animals. This finding rules out alternative mechanisms for the reinstated responding that rely on the interaction of non-contingent food and responding, such as superstitious reinforcement or the discriminative after-effects of food. In addition, in each experiment we demonstrated that manipulations known to affect contextual conditioning (signalling the food in Experiment 1, context extinction in Experiment 2, and switching contexts in Experiment 3) reduced the reinstatement. These results are consistent with the claim that contextual conditioning is important in controlling instrumental conditioning and closely parallel findings concerning the reinstatement of Pavlovian responsing following extinction.  相似文献   
18.
19.
Wray  K. Brad 《Synthese》2019,196(3):819-832
Synthese - Hoyningen-Huene (Systematicity: the nature of science, Oxford University Press, Oxford, 2013) develops an account of what science is, distinguishing it from common sense. According to...  相似文献   
20.
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