全文获取类型
收费全文 | 3892篇 |
免费 | 37篇 |
国内免费 | 3篇 |
专业分类
教育 | 2798篇 |
科学研究 | 375篇 |
各国文化 | 77篇 |
体育 | 215篇 |
综合类 | 2篇 |
文化理论 | 57篇 |
信息传播 | 408篇 |
出版年
2021年 | 23篇 |
2020年 | 42篇 |
2019年 | 49篇 |
2018年 | 84篇 |
2017年 | 79篇 |
2016年 | 84篇 |
2015年 | 50篇 |
2014年 | 58篇 |
2013年 | 1026篇 |
2012年 | 52篇 |
2011年 | 62篇 |
2010年 | 50篇 |
2009年 | 66篇 |
2008年 | 63篇 |
2007年 | 54篇 |
2006年 | 70篇 |
2005年 | 47篇 |
2004年 | 51篇 |
2003年 | 47篇 |
2002年 | 47篇 |
2001年 | 49篇 |
2000年 | 60篇 |
1999年 | 43篇 |
1998年 | 54篇 |
1997年 | 47篇 |
1996年 | 51篇 |
1995年 | 58篇 |
1994年 | 59篇 |
1993年 | 54篇 |
1992年 | 68篇 |
1991年 | 58篇 |
1990年 | 52篇 |
1989年 | 45篇 |
1988年 | 50篇 |
1987年 | 51篇 |
1986年 | 47篇 |
1985年 | 65篇 |
1984年 | 44篇 |
1983年 | 40篇 |
1982年 | 63篇 |
1981年 | 36篇 |
1980年 | 52篇 |
1979年 | 48篇 |
1978年 | 35篇 |
1977年 | 31篇 |
1976年 | 40篇 |
1975年 | 38篇 |
1974年 | 26篇 |
1973年 | 24篇 |
1971年 | 20篇 |
排序方式: 共有3932条查询结果,搜索用时 15 毫秒
101.
James H. Dugdale Calum A. Arthur Dajo Sanders Angus M. Hunter 《European Journal of Sport Science》2019,19(6):745-756
This study aimed to establish between-day reliability and validity of commonly used field-based fitness tests in youth soccer players of varied age and playing standards, and to discriminate between players without (“unidentified”) or with (“identified”) a direct route to professional football through their existing club pathway. Three-hundred-and-seventy-three Scottish youth soccer players (U11–U17) from three different playing standards (amateur, development, performance) completed a battery of commonly used generic field-based fitness tests (grip dynamometry, standing broad jump, countermovement vertical jump, 505 (505COD) and T-Drill (T-Test) change of direction and 10/20 m sprint tests) on two separate occasions within 7–14?days. The majority of field-based fitness tests selected within this study proved to be reliable measures of physical performance (ICC?=?0.83–0.97; p?.01). However, COD tests showed weaker reliability in younger participants (ICC?=?0.57–0.79; p?.01). The field-based fitness testing battery significantly discriminated between the unidentified and identified players; χ2 (7)?=?101.646, p?.001, with 70.2% of players being correctly classified. We have shown field-based fitness tests to be reliable measures of physical performance in youth soccer players. However, results from the 505COD and T-Test change of direction tests may be more variable in younger players, potentially due to complex demands of these tests and the limited training age established by these players. While the testing battery selected in this study was able to discriminate between unidentified and identified players, findings were inconsistent when attempting to differentiate between individual playing standards within the “identified” player group (development vs. performance). 相似文献
102.
103.
104.
105.
106.
107.
108.
William Gardner 《The Information Society》2013,29(2):141-146
Federal legislation requires that research produced with federal funding be available to the public under the Freedom of Information Act. I raise a concern that this power might be used to harass scientists. The goal of data sharing, however, is important, and should be facilitated through electronic data archiving. 相似文献
109.
110.