全文获取类型
收费全文 | 443篇 |
免费 | 9篇 |
专业分类
教育 | 334篇 |
科学研究 | 36篇 |
各国文化 | 2篇 |
体育 | 44篇 |
文化理论 | 2篇 |
信息传播 | 34篇 |
出版年
2023年 | 2篇 |
2022年 | 5篇 |
2021年 | 5篇 |
2020年 | 8篇 |
2019年 | 18篇 |
2018年 | 26篇 |
2017年 | 18篇 |
2016年 | 24篇 |
2015年 | 15篇 |
2014年 | 16篇 |
2013年 | 104篇 |
2012年 | 14篇 |
2011年 | 17篇 |
2010年 | 9篇 |
2009年 | 6篇 |
2008年 | 18篇 |
2007年 | 13篇 |
2006年 | 8篇 |
2005年 | 14篇 |
2004年 | 8篇 |
2003年 | 12篇 |
2002年 | 11篇 |
2001年 | 8篇 |
2000年 | 4篇 |
1999年 | 6篇 |
1997年 | 2篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 5篇 |
1990年 | 6篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1975年 | 2篇 |
1972年 | 2篇 |
1971年 | 1篇 |
1970年 | 2篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1963年 | 1篇 |
1962年 | 2篇 |
1960年 | 1篇 |
1908年 | 1篇 |
1907年 | 1篇 |
排序方式: 共有452条查询结果,搜索用时 15 毫秒
71.
Abstract In tournaments in various sports that feature one–on–one competition, the trophy is sometimes prominently displayed near the athletes during the final. Based on recent research on subtle reward cues, we propose that such trophies have the potential to induce choking under pressure in the match favourites, who are known to be most at risk. To test this idea, we analysed real-life tennis performance data (service performance and rally performance) from professional tournaments. While favourites generally outperformed underdogs during rallies, they did not do so in finals in which (a) large amounts of money were at stake and (b) a trophy was on display near the court. These findings support the idea that tournament trophies may distract favourites by continuously reminding them of what is at stake, and via that route may severely thwart their performance. 相似文献
72.
Henrik S⊘rensen Morten Zacho Erik B. Simonsen Poul Dyhre‐Poulsen Klaus Klausen 《Journal of sports sciences》2013,31(6):483-495
Fast unloaded movements (i.e. striking, throwing and kicking) are typically performed in a proximo‐distal sequence, where initially high proximal segments accelerate while distal segments lag behind, after which proximal segments decelerate while distal segments accelerate. The aims of this study were to examine whether proximal segment deceleration is performed actively by antagonist muscles or is a passive consequence of distal segment movement, and whether distal segment acceleration is enhanced by proximal segment deceleration. Seventeen skilled taekwon‐do practitioners were filmed using a high‐speed camera while performing a high front kick. During kicking, EMG recordings were obtained from five major lower extremity muscles. Based on the kinematic data, inverse dynamics computations were performed yielding muscle moments and motion‐dependent moments. The results indicated that thigh deceleration was caused by motion‐dependent moments arising from lower leg motion and not by active deceleration. This was supported by the EMG recordings. Lower leg acceleration was caused partly by a knee extensor muscle moment and partly by a motion‐dependent moment arising from thigh angular velocity. Thus, lower leg acceleration was not enhanced by thigh deceleration. On the contrary, thigh deceleration, although not desirable, is unavoidable because of lower leg acceleration. 相似文献
73.
Addressing the reasons for—and the solutions to—the “digital divide” has been on the public agenda since the emergence of the Internet. However, the term has meant quite different things, depending on the audience and the context, and these competing interpretations may in fact orient toward different policy outcomes. The goals of this article are twofold. First, the authors unpack the term “digital divide” and examine how it has been deployed and interpreted across a range of academic and policy discourses. Second, through a framing experiment embedded within a nationally representative survey, the authors demonstrate how presenting respondents with two different conceptual frames of the digital divide may lead to different perceptions of who is most accountable for addressing the issue. From this, they discuss the dynamic relationship between the construction and communication of policy discourse and the public understanding of the digital divide, as well as implications for effective communication about the digital divide and information and communication technology policy to the general public. 相似文献
74.
75.
76.
Thomas Nordström Christer Jacobson Pernilla Söderberg 《European Journal of Psychology of Education - EJPE》2016,31(2):175-191
This study, using a longitudinal design with a Swedish cohort of young readers, investigates if children’s early word decoding ability in second grade can predict later academic performance. In an effort to estimate the unique effect of early word decoding (grade 2) with academic performance (grade 9), gender and non-verbal cognitive ability were controlled for in hierarchical regression models. Results show that even after accounting for these factors, word decoding successfully predicted subject marks as well as attendance in advanced courses and language classes. The authors conclude that children’s early ability to decode words could be an important factor for predicting performance in school and, thus, stress the importance for schools to investigate children’s early word decoding ability. 相似文献
77.
Erik De Corte 《Learning Inquiry》2007,1(1):19-30
Starting from a brief analysis of adaptive competence in mathematics, this article describes a series of research-based characteristics
of the kind of learning processes that should be elicited in students to facilitate and support in them the progressive acquisition
of such competence. Four major characteristics are discussed in some detail: learning is constructive, self-regulated, situated
or contextual, and collaborative. A rather new approach to transfer of learning is then presented in which transfer is conceived
as the preparation for future learning. Throughout the article it is argued that, notwithstanding the progress made in research
on learning from instruction, numerous and complex issues and problems remain for continued inquiry. 相似文献
78.
79.
The aim of the present study was through semi-structured interviews to explore udeskole teacher’s perceptions of motivational factors and challenges while teaching regularly outside the classroom on a weekly basis during a year. Six females and two male udeskole teachers participated and answered an interview guide containing five themes about their motivations, student relations, teaching experiences, challenges and recognition. Udeskole was perceived to have substantial potentials to improve both academic learning and life skills and ‘the common third’, i.e. teacher–pupil relations, was mentioned as a value added to the indoor teaching. Health and safety issues were not perceived as barriers. 相似文献
80.
Vacuum interrupter, high reliability component of distribution switches, circuit breakers and contactors 总被引:1,自引:0,他引:1
SLADE Paul G LI Wang-pei MAYO Stephen SMITH R. Kirkland TAYLOR Erik D 《浙江大学学报(A卷英文版)》2007,8(3):335-342
The use of vacuum interrupters(VIs)as the current interruption component for switches,circuit breakers,reclosers and contactors operating at distribution voltages has escalated since their introduction in the mid-1950’s.This electrical product has developed a dominating position for switching and protecting distribution circuits.VIs are even being introduced into switching products operating at transmission voltages.Among the reasons for the VI’s popularity are its compactness,its range of application,its low cost,its superb electrical and mechanical life and its ease of application.Its major advantage is its well-established reliability.In this paper we show how this reliability has been achieved by design,by mechanical life testing and by electrical performance testing.We introduce the“sealed for life”concept for the VI’s integrity.We discuss this in terms of what is meant by a practical leak rate for VIs with a life of over 30 years.We show that a simple high voltage withstand test is an easy and effective method for monitoring the long-term vacuum integrity.Finally we evaluate the need for routine inspection of this electrical product when it is used in adverse ambient environments. 相似文献