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   3181篇
  免费   172篇
  国内免费   59篇
  2023年   40篇
  2022年   34篇
  2021年   58篇
  2020年   98篇
  2019年   88篇
  2018年   119篇
  2017年   123篇
  2016年   142篇
  2015年   94篇
  2014年   106篇
  2013年   356篇
  2012年   184篇
  2011年   185篇
  2010年   110篇
  2009年   105篇
  2008年   136篇
  2007年   155篇
  2006年   115篇
  2005年   120篇
  2004年   106篇
  2003年   82篇
  2002年   84篇
  2001年   68篇
  2000年   64篇
  1999年   56篇
  1998年   36篇
  1997年   32篇
  1996年   23篇
  1995年   17篇
  1994年   18篇
  1993年   19篇
  1992年   34篇
  1991年   28篇
  1990年   19篇
  1989年   14篇
  1988年   17篇
  1987年   19篇
  1986年   22篇
  1985年   18篇
  1984年   17篇
  1983年   16篇
  1981年   11篇
  1980年   15篇
  1979年   20篇
  1978年   16篇
  1977年   13篇
  1975年   22篇
  1974年   15篇
  1973年   14篇
  1966年   15篇
排序方式: 共有3412条查询结果,搜索用时 0 毫秒
1.
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   
2.
Recently, cross-cultural facial-expression recognition has become a research hotspot, and a standardised facial-expression material system can significantly help researchers compare and demonstrate the results of other studies. We developed a facial-expression database of Chinese Han, Hui and Tibetan ethnicities. In this study, six basic human facial expressions (and one neutral expression) were collected from 200 Han, 220 Hui and 210 Tibetan participants who lived in these regions. Four experts on each ethnicity evaluated the facial-expression images according to the expressions, and only those achieving inter-rater agreement were retained. Subsequently, 240 raters evaluated these images according to the seven emotions and rated the intensity of the expressions. Consequently, 2980 images were included in the database, including 930 images of Han individuals, 962 images of Hui individuals and 1088 images of Tibetan individuals. In conclusion, the facial-expression database of Chinese Han, Hui and Tibetan people was representative and reliable with a recognition rate of over 60%, making it well-suited for cross-cultural research on emotions.  相似文献   
3.
4.
5.
6.
7.
8.
Dkk(Dickkopf)是Wnt信号通路中重要的拮抗因子之一,通过与Wnt受体复合体LRP5/6结合来抑制Wnt信号通路.Dkk-1在代谢性骨病(骨质疏松症Paget病)、多种癌症、骨关节炎等疾病中都存在着异常表达并起到重要作用.本文将对现有的Dkk-1基因的研究进展进行总结,并对Dkk-1基因的研究意义进行了展望.  相似文献   
9.
Social class perception (identification) was studied as a function of ‘objective’ status (socioeconomic level) and class (occupational class) using a sample of Swedish high school students. Confirming the two minor hypotheses, the results disclosed that class perception was affected by both the ‘objective’ class and status of the subject: the manual occupational class, and those with low socioeconomic status, had in general a higher proportion of working-class identification than the nonmanual class, and those with low socioeconomic status, respectively. However, the major hypothesis, an interaction hypothesis stating that manuals are not affected by status in their class perceptions, was not confirmed. The results are discussed in the context of social psychological theory and earlier empirical research.  相似文献   
10.
Speakers in informal conversations tend to alternate regularly between lower and higher amounts of talking; the periods of these low/high activity cycles are on the order of 3, 6, and 15 minutes. Statistically significant periodicities occurred in 55% of the conversations studied. The periodograms that describe the partition of variance among periodic components whow consistent individual differences in the cyclic patterning of vocal activity. Discriminant analysis used the amount of variance accounted for by each of the 12 lowest-frequency periodic components as discriminating variables to see whether speakers could be identified on the basis of the cyclic patterns in vocal activity. Speakers were discriminated and classified at levels well above chance. This suggests that there are consistent individual differences among speakers in the length of cycles in amount of talk.We gratefully acknowledge support from the Central University Research Fund and from the office of the Dean of Liberal Arts at the University of New Hampshire.  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