全文获取类型
收费全文 | 253篇 |
免费 | 5篇 |
专业分类
教育 | 159篇 |
科学研究 | 55篇 |
各国文化 | 6篇 |
体育 | 11篇 |
文化理论 | 4篇 |
信息传播 | 23篇 |
出版年
2021年 | 5篇 |
2020年 | 7篇 |
2019年 | 6篇 |
2018年 | 8篇 |
2017年 | 9篇 |
2016年 | 6篇 |
2015年 | 4篇 |
2014年 | 9篇 |
2013年 | 74篇 |
2012年 | 5篇 |
2011年 | 2篇 |
2010年 | 5篇 |
2009年 | 4篇 |
2008年 | 2篇 |
2007年 | 3篇 |
2006年 | 3篇 |
2005年 | 5篇 |
2004年 | 5篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1997年 | 3篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1984年 | 4篇 |
1982年 | 2篇 |
1978年 | 3篇 |
1974年 | 4篇 |
1969年 | 2篇 |
1962年 | 2篇 |
1961年 | 2篇 |
1925年 | 2篇 |
1922年 | 1篇 |
1921年 | 1篇 |
1920年 | 1篇 |
1919年 | 1篇 |
1918年 | 2篇 |
1910年 | 1篇 |
1908年 | 3篇 |
1905年 | 2篇 |
1900年 | 1篇 |
1895年 | 1篇 |
1890年 | 5篇 |
1889年 | 8篇 |
排序方式: 共有258条查询结果,搜索用时 15 毫秒
61.
62.
63.
This paper deals with real-time discrete adaptive output trajectory tracking for induction motors in the presence of bounded disturbances. A recurrent high order neural network structure is used to design a nonlinear observer and based on this model, a discrete-time control law is derived, which combines discrete-time block control and sliding modes techniques. Applicability of the scheme is illustrated via experimental results in real-time for a three phase induction motor. 相似文献
64.
German Journal of Exercise and Sport Research - 相似文献
65.
In order to plan appropriate cooperative programs for particular higher education consortia, it is necessary to identify the characteristics of these organizations. The spatial configuration technique was used to illustrate the impact of eleven variables of the member institutions in differentiating among four consortia. Six of the variables — Control, Highest Degree Awarded, Percentage of Males, Math SAT Scores, Conventional Orientation, Scientific Orientation, and Endowment — were found to be significant in differentiating among the consortia. It was concluded that the spatial configuration technique was an effective way of visually comparing those consortia composed of member institutions, which as groups had similar and dissimilar characteristics. 相似文献
66.
67.
Trajectories of Infants’ Biobehavioral Development: Timing and Rate of A‐Not‐B Performance Gains and EEG Maturation
下载免费PDF全文
![点击此处可从《Child development》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Leigha A. MacNeill Nilam Ram Martha Ann Bell Nathan A. Fox Koraly Pérez‐Edgar 《Child development》2018,89(3):711-724
This study examined how timing (i.e., relative maturity) and rate (i.e., how quickly infants attain proficiency) of A‐not‐B performance were related to changes in brain activity from age 6 to 12 months. A‐not‐B performance and resting EEG (electroencephalography) were measured monthly from age 6 to 12 months in 28 infants and were modeled using logistic and linear growth curve models. Infants with faster performance rates reached performance milestones earlier. Infants with faster rates of increase in A‐not‐B performance had lower occipital power at 6 months and greater linear increases in occipital power. The results underscore the importance of considering nonlinear change processes for studying infants’ cognitive development as well as how these changes are related to trajectories of EEG power. 相似文献
68.
Using the Internet in teaching: the views of practitioners (A survey of the views of secondary school teachers in Sheffield, UK) 总被引:2,自引:0,他引:2
Andrew Madden Nigel Ford David Miller Philippa Levy 《British journal of educational technology : journal of the Council for Educational Technology》2005,36(2):255-280
A questionnaire was generated from the results of a series of interviews at The City School one of the 27 state secondary schools in Sheffield. In October 2002, it was sent out to 499 Heads of Department at the remaining 26 state secondary schools. Responses were received from 188 teachers, ranging in age from 24 to 60 years old. The purpose of the questionnaire was to gain information about teachers’ views of the Internet and its usefulness as an educational tool. Nearly 85% of teachers acquired their Internet skills informally (self‐taught, learned from friends/colleagues, etc), rather than on a taught course. Despite this, most of the respondents were confident of their ability to use the Internet, with the most confident users being young teachers of technical subjects. However, there was a widespread perception (particularly amongst women teachers) that students are more competent users of the Internet than are teachers. Older teachers were more likely to feel under pressure to use the Internet than their younger colleagues. Only about a third of teachers agreed with the statement “I often use the Internet with classes.” Responses varied significantly according to school and subject. There was strong support, however, for the suggestion that the Internet is a valuable source of learning and teaching materials. 相似文献
69.
Rojas-Franco Placido Franco-Colín Margarita Blas-Valdivia Vanessa Melendez-Camargo María Estela Cano-Europa Edgar 《Journal of Zhejiang University. Science. B》2021,22(7):603-608
正Arthrospira maxima (Spirulina) is a cyanobacterium which is considered a nutraceutical because it has antioxidant, anti-inflammatory, and cytoprotective properties in different renal disease models (RodriguezSánchez et al., 2012; Aziz et al., 2018; Memije-Lazaro et al., 2018). 相似文献
70.
This paper proposes a typology of communities of practice based on their knowledge characteristics. The structure of a community of practice, in terms of knowledge, may tend to the stratified or to the egalitarian. The predominant knowledge activity of the community may be sharing or nurturing. This produces four classes of community of practice. The paper identifies and discusses examples of these classes. It is argued that the class to which a community belongs tends to determine the rapidity with which knowledge within the community evolves and the degree of pluralism, as opposed to homogeneity, that the knowledge exhibits. The paper concludes by discussing some of the implications of the typology for knowledge management practice. 相似文献