全文获取类型
收费全文 | 14016篇 |
免费 | 194篇 |
国内免费 | 7篇 |
专业分类
教育 | 10193篇 |
科学研究 | 1210篇 |
各国文化 | 84篇 |
体育 | 1205篇 |
综合类 | 7篇 |
文化理论 | 94篇 |
信息传播 | 1424篇 |
出版年
2021年 | 113篇 |
2020年 | 169篇 |
2019年 | 289篇 |
2018年 | 387篇 |
2017年 | 392篇 |
2016年 | 348篇 |
2015年 | 223篇 |
2014年 | 304篇 |
2013年 | 2706篇 |
2012年 | 316篇 |
2011年 | 376篇 |
2010年 | 231篇 |
2009年 | 225篇 |
2008年 | 331篇 |
2007年 | 234篇 |
2006年 | 307篇 |
2005年 | 202篇 |
2004年 | 187篇 |
2003年 | 178篇 |
2002年 | 217篇 |
2001年 | 322篇 |
2000年 | 289篇 |
1999年 | 261篇 |
1998年 | 129篇 |
1997年 | 147篇 |
1996年 | 164篇 |
1995年 | 169篇 |
1994年 | 135篇 |
1993年 | 151篇 |
1992年 | 223篇 |
1991年 | 199篇 |
1990年 | 202篇 |
1989年 | 236篇 |
1988年 | 223篇 |
1987年 | 195篇 |
1986年 | 190篇 |
1985年 | 206篇 |
1984年 | 179篇 |
1983年 | 211篇 |
1982年 | 146篇 |
1981年 | 143篇 |
1980年 | 133篇 |
1979年 | 211篇 |
1978年 | 162篇 |
1977年 | 154篇 |
1976年 | 131篇 |
1975年 | 120篇 |
1974年 | 111篇 |
1973年 | 119篇 |
1971年 | 95篇 |
排序方式: 共有10000条查询结果,搜索用时 781 毫秒
1.
Purpose: Overuse injuries are common in sport, but complete understanding of injury risk factors remains incomplete. Although biomechanical studies frequently examine musculoskeletal injury mechanisms, human movement variability studies aim to better understand neuromotor functioning, with proposed connections between overuse injury mechanisms and changes in motor variability. Method: In a narrative review, we discuss the variability-overuse injury hypothesis, which suggests repeated load application leads to mechanical tissue breakdown and subsequent injury when exceeding the rate of physiological adaptation. Due to the multidisciplinary nature of this hypothesis, we incorporate concepts from motor control, neurophysiology, biomechanics, as well as research design and data analysis. We therefore summarize multiple perspectives while proposing theoretical relationships between movement variability and lower extremity overuse injuries. Results: Experimental data are presented and summarized from published experiments examining interactions between experimental task demands and movement variability in the context of drop landing movements, along with comparisons to previous movement variability studies. Conclusion: We provide a conceptual framework for sports medicine researchers interested in predicting and preventing sports injuries. Under performance conditions with greater task demands, we predict reduced trial-to-trial movement variability that could increase the likelihood of overuse injuries. 相似文献
2.
Research in Higher Education - State financial aid grant programs are commonly categorized as either need-based, merit-based, or both, but their initial eligibility requirements include many more... 相似文献
3.
Diego Pastor María Campayo-Piernas Jesús Tadeo Pastor 《Journal of sports sciences》2019,37(12):1403-1410
Classification is a defining feature of Para-sport, and sports-specific classification systems determined through multidisciplinary scientific research are required, i.e., evidence-based and focused on the relationship between the impairment and the key performance determinants. Data envelopment analysis (DEA) was applied as a classification tool using a directional distance function (DDF) model. The aim of the study was to test the DEA as a possible classification tool in cerebral palsy football. We analyse the performance of 56 international para-footballers with hypertonia, ataxia or athetosis, who completed a 20-test battery with DEA models. Five of the tests are included in the model (change of direction: Illinois agility test; jumping: standing broad jump, four bounds for distance, and triple hop with the non-dominant leg; 10-m sprint/acceleration; and ball dribbling, both in a straight line and following a trajectory), showing that players with less impairment exhibit the highest efficiency. This outcome suggests that DEA models might be feasible for detecting and discriminating the performance and magnitude of impairment in cerebral palsy football, with an objective ranking of the athletes in relation to different physical performance tests. This study also provides reference scores for decision-making during classification and guidance for further research in team Paralympic sports. 相似文献
4.
5.
James D. T. Tannock 《Higher Education Quarterly》1992,46(1):108-123
This article describes the Engineering Professors' Conference (EPC) approach to quality assurance for Higher Education Institutions, which is currently the only formalized alternative to British Standard 5750 'Quality Systems'. The EPC approach is based on principles of quality assurance and Total Quality Management which have been developed in industry. These ideas are briefly outlined, and an opinion expressed on the interpretation and application of BSS7S0 for HE. The EPC model is explained, illustrated with example elements taken from the EPC Specification and Guidelines for Quality Assurance in Higher Education. A top-down approach to the development of an institutional quality system is described, based on a quality policy statement. Areas of activity which have an important impact on the quality of education are identified, emphasising the quality assurance requirements of academic departments. Supporting and administrative quality system requirements are also described, as these also play an important role in the quality of education. Formal quality procedures and documentation in key areas are proposed. 相似文献
6.
7.
8.
9.
10.