全文获取类型
| 收费全文 | 530篇 |
| 免费 | 11篇 |
| 国内免费 | 1篇 |
专业分类
| 教育 | 375篇 |
| 科学研究 | 23篇 |
| 各国文化 | 9篇 |
| 体育 | 68篇 |
| 综合类 | 1篇 |
| 文化理论 | 12篇 |
| 信息传播 | 54篇 |
出版年
| 2023年 | 2篇 |
| 2022年 | 5篇 |
| 2021年 | 5篇 |
| 2020年 | 11篇 |
| 2019年 | 28篇 |
| 2018年 | 34篇 |
| 2017年 | 17篇 |
| 2016年 | 28篇 |
| 2015年 | 17篇 |
| 2014年 | 18篇 |
| 2013年 | 136篇 |
| 2012年 | 22篇 |
| 2011年 | 24篇 |
| 2010年 | 14篇 |
| 2009年 | 12篇 |
| 2008年 | 18篇 |
| 2007年 | 9篇 |
| 2006年 | 12篇 |
| 2005年 | 16篇 |
| 2004年 | 5篇 |
| 2003年 | 5篇 |
| 2002年 | 9篇 |
| 2001年 | 7篇 |
| 2000年 | 3篇 |
| 1999年 | 6篇 |
| 1998年 | 7篇 |
| 1997年 | 2篇 |
| 1995年 | 5篇 |
| 1994年 | 2篇 |
| 1993年 | 6篇 |
| 1991年 | 4篇 |
| 1990年 | 7篇 |
| 1989年 | 5篇 |
| 1988年 | 4篇 |
| 1987年 | 2篇 |
| 1986年 | 6篇 |
| 1982年 | 2篇 |
| 1981年 | 4篇 |
| 1980年 | 2篇 |
| 1979年 | 6篇 |
| 1976年 | 1篇 |
| 1972年 | 1篇 |
| 1968年 | 1篇 |
| 1961年 | 1篇 |
| 1944年 | 1篇 |
| 1938年 | 1篇 |
| 1934年 | 1篇 |
| 1922年 | 1篇 |
| 1921年 | 1篇 |
| 1903年 | 2篇 |
排序方式： 共有542条查询结果，搜索用时 250 毫秒
1.
2.
3.
4.
5.
EDITORS' PREFACE 总被引：1，自引：0，他引：1
6.
7.
This study estimated the expected point value for starting possessions in different field locations during rugby league match-play and calculated the mean expected points for each subsequent play during the possession. It also examined the origin of tries scored according to the method of gaining possession. Play-by-play data were taken from all 768 regular-season National Rugby League (NRL) matches during 2010–2013. A probabilistic model estimated the expected point outcome based on the net difference in points scored by a team in possession in a given situation. An iterative method was used to approximate the value of each situation based on actual scoring outcomes. Possessions commencing close to the opposition’s goal-line had the highest expected point equity, which decreased as the location of the possession moved towards the team’s own goal-line. Possessions following an opposition error, penalty or goal-line dropout had the highest likelihood of a try being scored on the set subsequent to their occurrence. In contrast, possessions that follow an opposition completed set or a restart were least likely to result in a try. The expected point values framework from our model has applications for informing playing strategy and assessing individual and team performance in professional rugby league. 相似文献
8.
Aaron J. Beach René E. D. Ferdinands Peter J. Sinclair 《Sports biomechanics / International Society of Biomechanics in Sports》2016,15(3):295-313
Spin bowling is generally coached using a standard technical framework, but this practice has not been based upon a comparative biomechanical analysis of leg-spin and off-spin bowling. This study analysed the three-dimensional (3D) kinematics of 23 off-spin and 20 leg-spin bowlers using a Cortex motion analysis system to identify how aspects of the respective techniques differed. A multivariate ANOVA found that certain data tended to validate some of the stated differences in the coaching literature. Off-spin bowlers had a significantly shorter stride length (p = 0.006) and spin rate (p = 0.001), but a greater release height than leg-spinners (p = 0.007). In addition, a number of other kinematic differences were identified that were not previously documented in coaching literature. These included a larger rear knee flexion (p = 0.007), faster approach speed (p < 0.001), and flexing elbow action during the arm acceleration compared with an extension action used by most of the off-spin bowlers. Off-spin and leg-spin bowlers also deviated from the standard coaching model for the shoulder alignment, front knee angle at release, and forearm mechanics. This study suggests that off-spin and leg-spin are distinct bowling techniques, supporting the development of two different coaching models in spin bowling. 相似文献
9.
10.