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   202篇
  免费   8篇
教育   134篇
科学研究   16篇
各国文化   3篇
体育   25篇
文化理论   4篇
信息传播   28篇
  2022年   2篇
  2021年   5篇
  2020年   3篇
  2019年   1篇
  2018年   8篇
  2017年   8篇
  2016年   3篇
  2015年   4篇
  2014年   4篇
  2013年   66篇
  2012年   4篇
  2011年   4篇
  2010年   8篇
  2009年   6篇
  2008年   9篇
  2007年   8篇
  2006年   6篇
  2005年   5篇
  2004年   6篇
  2003年   4篇
  2002年   4篇
  2001年   1篇
  2000年   9篇
  1999年   1篇
  1997年   1篇
  1996年   6篇
  1995年   1篇
  1994年   2篇
  1993年   5篇
  1992年   4篇
  1990年   3篇
  1988年   1篇
  1987年   1篇
  1984年   1篇
  1982年   1篇
  1979年   1篇
  1978年   1篇
  1977年   1篇
  1976年   2篇
排序方式: 共有210条查询结果,搜索用时 46 毫秒
201.
202.
203.
Early experiences with books predict later reading success, and an interactive shared reading style called “dialogic reading” is especially beneficial to emergent literacy. Electronic console (EC) books, CD‐rom books, and e‐book apps are designed to teach preschoolers preliteracy skills, but research has yet to systematically explore the impact of these types of books on established predictors of positive literacy outcomes. This research fills that gap with two studies investigating dialogic language and children's story comprehension in a total of 165 parent–child dyads reading battery‐operated, touch‐sensitive children's electronic console books or traditional books. Results revealed that parent–child dialogic reading and children's story comprehension were both negatively affected by the presence of electronic features. Ways in which e‐books may be altered to better serve as educational tools in this new era are discussed.  相似文献   
204.
Increasingly, information and communication technology (ICT) uses are transforming professional activities and interactions in ways that challenge traditional assumptions about professional identity. In this article, we consider the ways in which the professional identities of research scientists in oceanography and marine biology are shaped by the use of ICTs. We draw empirical data from an ongoing study of scientific research collaborations that examines uses of basic communication technologies, as well as scientific technologies with embedded ICT components. Our analysis suggests that development and use of ICT-enabled scientific technologies are identity enhancing for many scientists, facilitating their development of unique areas of scientific knowledge. ICT-related changes in data collection, collaborative coordination, and scientific interaction also challenge traditional definitions of expertise and professional identity. An examination of these challenges directs attention to the project identities that form around ICT-enabled scientific technologies and the ways that those project identities are enacted through ICTs.  相似文献   
205.

Background:

In vitro hemolysis can be induced by several biological and technical sources, and may be worsened by forced aspiration of blood in vacuum tubes. This study was aimed to compare the probability of hemolysis by drawing blood with a commercial evacuated blood collection tube, and S-Monovette used either in the “vacuum” or “aspiration” mode.

Materials and methods:

The study population consisted in 20 healthy volunteers. A sample was drawn into 4.0 mL BD Vacutainer serum tube from a vein of one upper arm. Two other samples were drawn with a second venipuncture from a vein of the opposite arm, into 4.0 mL S-Monovette serum tubes, by both vacuum an aspiration modes. After separation, serum potassium, lactate dehydrogenase (LD) and hemolysis index (HI) were tested on Beckman Coulter DxC.

Results:

In no case the HI exceed the limit of significant hemolysis. As compared with BD Vacutainer, no significant differences were observed for potassium and LD using S-Monovette with vacuum method. Significant increased values of both parameters were however found in serum collected into BD Vacutainer and S-Monovette by vacuum mode, compared to serum drawn by S-Monovette in aspiration mode. The mean potassium bias was 2.2% versus BD Vacutainer and 2.4% versus S-Monovette in vacuum mode, that of LD was 2.7% versus BD Vacutainer and 2.1% versus S-Monovette in vacuum mode. None of these variations exceeded the allowable total error.

Conclusions:

Although no significant macro-hemolysis was observed with any collection system, the less chance of producing micro-hemolysis by S-Monovette in aspiration mode suggest that this device may be used when a difficult venipuncture combined with the vacuum may increase the probability of spurious hemolysis.  相似文献   
206.
Abstract

Despite its widespread use in performance assessment, the reliability of vertical jump in an ageing population has not been addressed properly. The aim of the present study was to assess intra- and inter-day reliability of countermovement jump in healthy middle-aged (55–65 years) and older (66–75 years) men and women. Eighty-two participants were recruited and asked to perform countermovement jumps on two different occasions interspersed by 4 weeks. The middle-aged groups exhibited excellent absolute reliability for flight height, jump height, peak force, peak power, peak force/body mass, and peak power/body mass, with coefficients of variation ranging from 2.9% to 7.2% in men and from 3.6% to 6.9% in women and moderate-to-high intraclass correlations (0.75 to 0.97 in men; 0.77 to 0.95 in women). The older groups displayed good coefficients of variation (4.2% to 10.8% in men and 3.4% to 9.5% in women), but the intraclass correlations were low-to-high (0.43 to 0.84 in men; 0.42 to 0.93 in women). Overall, intra-session reliability was higher than inter-session reliability. Peak power was by far the most consistent variable, whereas flight and jump height had the most marked variability. The minimum detectable change varied from 10.5% to 33%, depending on the variable examined, suggesting important implications for intervention studies.  相似文献   
207.
Conclusions set forth in Serious and Violent Juvenile Offenders (1997) and other recent reports are remarkably similar to those that men and women on both side of the Atlantic had made a century ago: prevention is better than punishment; stable families are important; schools and communities must take a role in providing positive experiences for children and youth. The Revd William Byron Forbush, sociologist Charles Zueblin, philanthropist Louise de Koven Bowen and scores of other men and women also believed that ‘structured playground activities’ and after-school recreation programmes were important interventions. Chicago's Hull-House, which was inspired by Toynbee Hall, had developed extensive educational and recreational offerings for the youth of its community by the 1890s. Scores of settlement houses, which numbered over 200 by 1904, and other private endeavours directed their energies and resources to such programmes before the First World War.  相似文献   
208.
209.
To examine whether children (mean age 34 months) can fast map and extend novel action labels to actions for which they do not already have names, the comprehension of familiar and novel verbs was tested using colored drawings of Sesame Street characters performing both familiar and unfamiliar actions. Children were asked to point to the character "verbing," from among sets of 4 drawings. With familiar words and actions, children made correct choices 97% of the time. With novel action words, children performed at levels mostly significantly above chance, selecting a previously unlabeled action or another token of a just-names action. In a second, control experiment children were asked to select an action from among the same sets of 4 drawings, but they were not given a novel action name. Here children mainly demonstrated performance at levels not significantly different from chance, showing that the results from the main experiment were attributable to the presence of a word in the request. Results of these studies are interpreted as support for the availability of principles to ease verb acquisition.  相似文献   
210.
Roberta Taylor 《Literacy》2012,46(3):156-166
Children's classroom talk and the connections between talk and text are current concerns for teachers. A deeper understanding of what child communication entails can ensure greater pedagogic support for the processes involved in text production. This article reports on a research project using multimodal discourse analysis to investigate child‐to‐child interaction in class. This research sought to uncover what multimodal analysis can reveal about the collaborative and creative meaning making, which children employ in spontaneous classroom discourse. Creativity here is understood in terms of everyday creativity in language. Instantiations of video‐recorded classroom communication between children have been closely analysed using a framework based on a functional view of interaction, specifically the work of the textual meta‐function. Attention to cohesive devices of intertextual referencing, idiom and metaphor as well as repetition and reference through a multimodal lens has revealed the ways in which all modes work in an integrated ensemble to make meaning. Examples in this article of the ways in which children ‘mess about’ with multimodal semiotic resources, employing them intertextually in metaphorical meaning making, have been taken from a Year 5 mixed primary geography lesson on the water cycle.  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