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   620篇
  免费   12篇
教育   501篇
科学研究   13篇
各国文化   7篇
体育   53篇
文化理论   3篇
信息传播   55篇
  2023年   5篇
  2022年   6篇
  2021年   6篇
  2020年   13篇
  2019年   31篇
  2018年   34篇
  2017年   27篇
  2016年   30篇
  2015年   15篇
  2014年   26篇
  2013年   187篇
  2012年   18篇
  2011年   15篇
  2010年   17篇
  2009年   13篇
  2008年   10篇
  2007年   25篇
  2006年   13篇
  2005年   9篇
  2004年   12篇
  2003年   11篇
  2002年   7篇
  2001年   10篇
  2000年   10篇
  1999年   7篇
  1998年   3篇
  1997年   6篇
  1996年   3篇
  1995年   5篇
  1994年   3篇
  1993年   2篇
  1992年   4篇
  1991年   7篇
  1990年   2篇
  1989年   4篇
  1987年   5篇
  1984年   3篇
  1982年   2篇
  1981年   3篇
  1979年   2篇
  1977年   2篇
  1976年   2篇
  1974年   2篇
  1970年   2篇
  1969年   4篇
  1968年   1篇
  1966年   1篇
  1965年   1篇
  1955年   1篇
  1890年   1篇
排序方式: 共有632条查询结果,搜索用时 15 毫秒
611.
612.
613.
‘Open data’ has recently emerged as a label for renewed attempts to promote scientific exchange. As part of such efforts, the posting of data online is often portrayed as commonly beneficial: individual scientists accrue greater prominence while at the same time fostering communal knowledge. Yet, how scientists in non-Western research settings assess such calls for openness has been the subject of little empirical study. Based on extended fieldwork with biochemistry laboratories in sub-Sahara Africa, this paper examines a variety of reasons why scientists opt for closure over openness with regard to their own data. We argue that the heterogeneity of research environments calls into question many of the presumptions made as part of open data. Inequalities in research environments can mean that moves towards sharing create binds and dilemmas. These observations suggest that those promoting openness must critically examine current research governance and funding systems that continue to perpetuate disparities. The paper proposes an innovative approach to facilitating openness: coupling the sharing of data with enabling scientists to redress their day-to-day research environment demands. Such a starting basis provides an alternative but vital link between the aspirations for science aired today as part of international discussions and the daily challenges of undertaking research in low-resourced environments.  相似文献   
614.
615.
Young people’s aspirations remain an enduring focus of education policy interest and concern. Drawing on data from an ongoing five-year study of young people’s science and career aspirations (age 10–14), this paper asks what do young people aspire to at age 12/13, and what influences these aspirations? It outlines the main aspirations and sources of these aspirations as expressed by young people in England in the last year of primary school (survey of 9000+ Y6 pupils, aged 10/11, interviews with 92 children and 76 parents) and the second year of secondary school (survey of 5600+ Y8 pupils, aged 12/13, interviews with 85 pupils). We demonstrate how aspirations are shaped by structural forces (e.g. social class, gender and ethnicity) and how different spheres of influence (home/family, school, hobbies/leisure activities and TV) appear to shape different types of aspirations. The paper concludes by considering the implications for educational policy and careers education.  相似文献   
616.
617.
Abstract

The aim of the study was to validate the self-report Multimedia Activity Recall for Children and Adolescents (MARCA) against accelerometry for the assessment of physical activity in New Zealand children. Participants (n = 716, 10–18 years) recalled 3–4 days of activity using the MARCA and underwent a partially overlapping 7-day accelerometry protocol during a national survey. Spearman correlation coefficients (ρ) assessed the association between accelerometer-derived counts per minute and MARCA-derived physical activity level and time in locomotion. Both data sources estimated time spent in light and moderate–vigorous physical activity. Association and agreement between methods for light physical activity and moderate–vigorous physical activity was assessed using correlations and Bland–Altman plots respectively, and paired t-tests conducted. Accelerometer-derived activity counts were moderately correlated with both MARCA-derived physical activity level and locomotion (ρ = 0.38, P < 0.0001). The correlation between methods was –0.14 for light physical activity and 0.28 for moderate–vigorous physical activity (P < 0.0001). The MARCA overestimated moderate–vigorous physical activity compared with accelerometry (120 min, P < 0.0001), which increased as moderate–vigorous physical activity time increased. Some sex and ethnicity (Māori [indigenous] versus non-Māori) differences were observed. Overall, the MARCA indicated moderate validity for assessment of physical activity level, locomotion and moderate–vigorous physical activity and poor validity for assessment of light physical activity. This was comparable to other self-report tools. The MARCA has utility for future large-scale research.  相似文献   
618.
The purpose of this study was to examine the extent to which physical activity among adolescent female friends is interdependent. The participants were 318 adolescent girls with a mean age of 16.0 years (range: 15–18 years). Pedometry was used to assess physical activity over 4 days. The relationship between an individual girl and her first-nominated reciprocal friend's physical activity level was moderate (r = 0.45, 90% confidence interval = 0.31, 0.56), when the friendship was nonreciprocal it was trivial (r = -.06, 90% confidence interval = -.36. .25). Friends' physical activity levels explained between 27% and 32% of an individual's pedometer-determined physical activity level. Reciprocity of friendship is an important variable to consider when understanding the relationship between adolescent female friends' physical activity. When friendships are reciprocal, there is a stronger relationship between friends' physical activity.  相似文献   
619.
Morley  Louise  Roberts  Paul  Ota  Hiroshi 《Higher Education》2021,82(4):765-781
Higher Education - Positive attributes stick to higher education internationalisation, and it is a policy paradigm with performative effects. Internationalisation draws on imagined virtuous flows...  相似文献   
620.
An experiment was conducted with 151 primary school children from three year levels, in a suburban primary school, set in a moderately high socio-economic area. The object of the investigation was to test the understanding of twelve anaphoric pronouns, which were embedded in passages of continuous text. The relationship between the perception of the cohesive items, and general reading comprehension was studied, as was the difference between the performance of girls and boys. A further question related to the understanding of anaphoric items set within direct speech. Results showed a significant relationship between the comprehension of the selected anaphoric personal items and ability in reading, as measured by a standardised test. In the early school years, girls were superior to boys in their perception of the items, but no difference was found at the upper level of the school. Children of all levels found the items set within quoted speech more difficult to comprehend than the items in the rest of the text. Some practical teaching strategies are discussed, and attention is drawn to areas where teachers' awareness of cohesion could prove useful.  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