全文获取类型
收费全文 | 16004篇 |
免费 | 217篇 |
国内免费 | 8篇 |
专业分类
教育 | 11700篇 |
科学研究 | 1322篇 |
各国文化 | 99篇 |
体育 | 1370篇 |
综合类 | 7篇 |
文化理论 | 136篇 |
信息传播 | 1595篇 |
出版年
2021年 | 161篇 |
2020年 | 248篇 |
2019年 | 427篇 |
2018年 | 531篇 |
2017年 | 536篇 |
2016年 | 476篇 |
2015年 | 299篇 |
2014年 | 357篇 |
2013年 | 3053篇 |
2012年 | 361篇 |
2011年 | 418篇 |
2010年 | 270篇 |
2009年 | 248篇 |
2008年 | 345篇 |
2007年 | 258篇 |
2006年 | 331篇 |
2005年 | 218篇 |
2004年 | 198篇 |
2003年 | 195篇 |
2002年 | 225篇 |
2001年 | 332篇 |
2000年 | 300篇 |
1999年 | 272篇 |
1998年 | 137篇 |
1997年 | 164篇 |
1996年 | 181篇 |
1995年 | 185篇 |
1994年 | 146篇 |
1993年 | 170篇 |
1992年 | 241篇 |
1991年 | 218篇 |
1990年 | 219篇 |
1989年 | 246篇 |
1988年 | 246篇 |
1987年 | 212篇 |
1986年 | 212篇 |
1985年 | 221篇 |
1984年 | 192篇 |
1983年 | 230篇 |
1982年 | 172篇 |
1981年 | 162篇 |
1980年 | 159篇 |
1979年 | 233篇 |
1978年 | 187篇 |
1977年 | 169篇 |
1976年 | 153篇 |
1975年 | 130篇 |
1974年 | 121篇 |
1973年 | 128篇 |
1971年 | 106篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
David Sánchez-Oliva Rebecca M. Leech Alberto Grao-Cruces Irene Esteban-Cornejo Carmen Padilla-Moledo Oscar L. Veiga 《Journal of sports sciences》2020,38(9):1062-1069
ABSTRACTThe aims of this study were to identify profiles of sedentary behaviour (SB) patterns, based on leisure-time self-reported SB modalities (screen, educative, social, and relaxing) and to evaluate changes in these profiles over 2 years among Spanish youth aged 8–18 years. Latent profile analysis (LPA), a data-driven analytic approach, was used to identify groups of boys and girls (n = 1553; 48% girls; mean±SD age: 12.56 ± 2.49 y) with distinct SB profiles using the SB modalities (time/d) as input variables. Latent transition analysis, an extension of LPA that uses longitudinal data, was used to analyse 2-year changes in these profiles. At baseline, four and three SB profiles were found among boys (labelled: screen, educative, social, and relaxing) and girls (labelled: screen/social, educative, and relaxing), respectively. Overall, more girls (range: 48%-67%) had the same profile over time, than boys (40%-52%). Participants with a screen or relaxing SB profile at baseline were more likely to have an educative profile after 2 years. Youth with a social and an educative SB profile at baseline were more likely to transition to profiles characterized by higher screen and social SB, respectively. Using a novel and person-centered approach, this study identified gender-specific SB profiles that were moderately stable over time. 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.
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.