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   733篇
  免费   5篇
教育   529篇
科学研究   69篇
各国文化   23篇
体育   54篇
综合类   1篇
文化理论   15篇
信息传播   47篇
  2022年   9篇
  2021年   7篇
  2020年   9篇
  2019年   8篇
  2018年   23篇
  2017年   18篇
  2016年   18篇
  2015年   13篇
  2014年   13篇
  2013年   202篇
  2012年   14篇
  2011年   17篇
  2010年   13篇
  2009年   10篇
  2008年   13篇
  2007年   23篇
  2006年   15篇
  2005年   7篇
  2004年   19篇
  2003年   11篇
  2002年   8篇
  2001年   7篇
  2000年   7篇
  1999年   5篇
  1998年   5篇
  1996年   9篇
  1995年   5篇
  1994年   6篇
  1992年   7篇
  1991年   6篇
  1990年   6篇
  1988年   6篇
  1987年   5篇
  1986年   8篇
  1984年   9篇
  1983年   6篇
  1981年   5篇
  1980年   11篇
  1979年   11篇
  1978年   5篇
  1977年   8篇
  1976年   9篇
  1975年   9篇
  1974年   7篇
  1973年   6篇
  1969年   5篇
  1968年   4篇
  1933年   4篇
  1928年   4篇
  1927年   8篇
排序方式: 共有738条查询结果,搜索用时 625 毫秒
721.
Abstract. Professors are often displeased with the research and synthesis of thought demonstrated in many of their students' research papers. One way to address this problem is by rewording assignments to encourage critical thinking. By reworking traditional research assignments to reflect the five information-literacy skills developed by the Association of College and Research Libraries, instructors can guide students through the research process in ways that actively develop critical thought processes.  相似文献   
722.
Edwin Mansfield’s contributions to the economics of technology are summarized from the early 1960s through his death in 1997. Mansfield’s methodology is discussed, as are his contributions on: the diffusion of technical innovation, the effect of firm size on innovation, the role of academic and basic research in increasing innovation and productivity, international technology transfer and the inaccuracy of technological forecasts. The economics profession’s evaluation of the relative importance of Mansfield’s work is presented, using as evidence citation counts of his works collected from the Social Science Citation Index (SSCI). Identified as among Mansfield’s most important contributions are his work on the importance of academic research for industrial innovations, his empirical estimation of the rates of diffusion of different innovations, and his estimation of the private and social returns from investments in industrial innovations. Finally, we present Mansfield’s advice on the future of the economics of technology.  相似文献   
723.
Education and Information Technologies - This article examines how research publications in education and information technologies have changed over the last twenty-five years. The authors...  相似文献   
724.
The low rates of child literacy in South Africa are cause for considerable concern. Research from the developed world shows that parental sharing of picture books with infants and young children is beneficial for child language and cognitive development, as well as literacy skills. We conducted a pilot study to examine whether such benefits might extend to an impoverished community in South Africa, by evaluating the impact of training mothers in book sharing with their 14–18 month old infants. Seventeen mothers received book sharing training; and 13 mothers did not, but instead received a comparison training in toy play. We assessed the mothers’ behavior during both book sharing and toy play before and after training, and we also assessed infant attention and language. Mothers receiving book sharing training engaged well with it, and they also benefited from it; thus, compared to the comparison group mothers, they became more sensitive, more facilitating, and more elaborative with their infants during book sharing, and they also became more sensitive to their infants during toy play. In addition, infants whose mothers received the book sharing training showed greater benefits than the comparison group infants in both their attention and language. Training in book sharing for families living in conditions of marked socio-economic adversity in South Africa has the potential to be of considerable benefit to child developmental progress. A large scale controlled trial is required to confirm this.  相似文献   
725.
Abstract

The objective of the present study was to monitor the immunological and hormonal responses and the occurrence of upper respiratory symptoms in adolescent basketball athletes during the different stages of a sports season. Anthropometric measures, biochemical analyses (interleukin-6, interleukin-10, tumour necrosis factor-alpha, C-reactive protein, testosterone and cortisol), neuromuscular evaluations (standing vertical jumping ability, agility and estimated VO2max) and leukocyte counts were performed at four moments: 72 h before the season (?72 h); before the season (Pre-season); after six weeks, at the end of the preparatory period (Preparatory); and after 20 weeks, at the end of the competitive period (Competitive). Also, the occurrence of upper respiratory symptoms was collected weekly during all stages of the season. There were significant increases in monocytes, cortisol, tumour necrosis factor-alpha and C-reactive protein at the Competitive moment as compared to the Pre-season. In addition, interleukin-10 decreased at the Competitive moment as compared to the Pre-season. Occurrence of upper respiratory symptoms demonstrated increases (38%) during the competitive period as compared to the preparatory. These results suggest that periods of training and competition could increase the occurrence of upper respiratory symptoms in adolescent athletes and this may be due to the unwanted effects of an inflammatory process in response to the excessive stress of training and competition.  相似文献   
726.
ABSTRACT

This study used the intensity gradient (IG) and average acceleration metrics to describe children’s activity profiles and explore associations with body mass index (BMI) z-score. Two hundred and forty-six children (n = 138 girls) aged 9.6 ± 1.4 years wore a wrist-mounted ActiGraph wGT3X-BT accelerometer for 7 days on their non-dominant wrist. Physical activity (PA) metrics captured included: the IG which describes the intensity distribution of accelerations across the 24 h monitoring period; average acceleration which provides a measure of the volume of activity; total moderate-to-vigorous PA (MVPA) and inactive time. Acceleration was averaged over 5s epochs. Finally, BMI z-score was calculated for each participant. Average acceleration was negatively associated with BMI z-score (p < 0.05) independent of age and gender but not IG. The IG was negatively associated with BMI z-score independent of potential correlates and average acceleration. Total MVPA was not associated with BMI-z score. The IG and average acceleration metrics may be used to explore the independent or cumulative effects of the volume and intensity distribution of activity upon measures of health and well-being in children to inform specific activity recommendations.  相似文献   
727.
Abstract

The purpose of this study was to examine the relationships of achievement goal orientations and perceived motivational climate to perceptions of the intensity and direction of competitive state anxiety in a sample of university athletes representing various team sports. Although some studies have demonstrated that task orientation and mastery climate are associated with adaptive emotional patterns and ego orientation and performance climate are linked to less adaptive emotions, others have not verified these findings. In the present study, structural equation modeling was used to test these links. The results showed that perceptions of a performance climate were associated with ego orientation, whereas perceptions of a mastery climate were linked to task orientation. Furthermore, no significant links were found between task orientation and direction of competitive anxiety, while it was shown that the impact of ego orientation on the intensity and direction of cognitive and somatic anxiety was exerted through self-confidence. No significant direct links were found between motivational climates and competitive anxiety, thus implying that motivational climates may have an indirect impact on affective responses through the different goal orientations. The findings of the present study are discussed along with suggestions for examining situational and individual difference variables that may explain the relationships between intensity and direction of competitive anxiety and achievement goals and motivational climates.  相似文献   
728.
Abstract

Initially an inventory was constructed to measure certain configurations of leisure behavior to include the frequency of participation in 70 commonly practiced leisure time and recreational activities. After pretesting, the inventory was submitted to 120 males who had been randomly selected from the City Directory for Austin, Texas. The 75 responses which were completed and returned were sorted into four major age groups. The responses were subjected to a multiple discriminant analysis procedure to determine whether the groups could be distinguished from each other on the basis of the entire profile. Significant discrimination between the four age groups was demonstrated. Three discriminant functions were obtained and 14 of the 70 inventory items were found to be the highest contributors to the three derived discriminant functions.  相似文献   
729.
全球社会中的公民教育   总被引:1,自引:0,他引:1  
公民是有知觉的道德主体,每个社会都要求有公民教育,而公民道德教育又是其重要的方面。教学者总是希望公民的教与学成为课程的一部分,对学生来说,就要求他们在实践中运用说教、经验、反思这三个方法。如果要形成某种意义上的全球公民的概念,那么教育的作用是至关重要的。要使全球公民成为现实,就需要有合作和相互依存的心态,超越国家界限和传统的束缚,这也将寄希望于未来的一代。  相似文献   
730.
Prior to early retirement, Arthur Arnold was Head of Community and Teaching Studies at Bradford College in the U. K. His book,Children, Animals and Books—The Historical and Social Significance of Animals in Children's Literature, is forthcoming (Croom Helm). He has also written novels for teenagers. Mr. Arnold's article in defense of the wolf appears inCLE, Summer, 1986.  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