全文获取类型
收费全文 | 941篇 |
免费 | 13篇 |
专业分类
教育 | 776篇 |
科学研究 | 31篇 |
各国文化 | 4篇 |
体育 | 32篇 |
文化理论 | 3篇 |
信息传播 | 108篇 |
出版年
2022年 | 7篇 |
2021年 | 20篇 |
2020年 | 16篇 |
2019年 | 19篇 |
2018年 | 33篇 |
2017年 | 37篇 |
2016年 | 28篇 |
2015年 | 24篇 |
2014年 | 34篇 |
2013年 | 214篇 |
2012年 | 28篇 |
2011年 | 32篇 |
2010年 | 20篇 |
2009年 | 25篇 |
2008年 | 30篇 |
2007年 | 20篇 |
2006年 | 19篇 |
2005年 | 15篇 |
2004年 | 23篇 |
2003年 | 24篇 |
2002年 | 18篇 |
2001年 | 15篇 |
2000年 | 24篇 |
1999年 | 12篇 |
1998年 | 12篇 |
1997年 | 12篇 |
1996年 | 15篇 |
1995年 | 19篇 |
1994年 | 16篇 |
1993年 | 15篇 |
1992年 | 14篇 |
1991年 | 9篇 |
1990年 | 10篇 |
1989年 | 4篇 |
1988年 | 7篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 9篇 |
1984年 | 11篇 |
1983年 | 6篇 |
1982年 | 7篇 |
1981年 | 9篇 |
1980年 | 8篇 |
1979年 | 2篇 |
1978年 | 5篇 |
1977年 | 4篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1974年 | 2篇 |
1968年 | 1篇 |
排序方式: 共有954条查询结果,搜索用时 15 毫秒
951.
Oliver J. Quittmann Joshua Meskemper Thomas Abel Kirsten Albracht Tina Foitschik Sandra Rojas-Vega Heiko K. Strüder 《Sports Engineering》2018,21(4):283-294
In Paralympic sports, biomechanical optimisation of movements and equipment seems to be promising for improving performance. In handcycling, information about the biomechanics of this sport is mainly provided by case studies. The aim of the current study was (1) to examine changes in handcycling propulsion kinematics and kinetics due to increasing workloads and (2) identify parameters that are associated with peak aerobic performance. Twelve non-disabled male competitive triathletes without handcycling experience voluntarily participated in the study. They performed an initial familiarisation protocol and incremental step test until exhaustion in a recumbent racing handcycle that was attached to an ergometer. During the incremental test, tangential crank kinetics, 3D joint kinematics, blood lactate and ratings of perceived exertion (local and global) were identified. As a performance criterion, the maximal power output during the step test (Pmax) was calculated and correlated with biomechanical parameters. For higher workloads, an increase in crank torque was observed that was even more pronounced in the pull phase than in the push phase. Furthermore, participants showed an increase in shoulder internal rotation and abduction and a decrease in elbow flexion and retroversion. These changes were negatively correlated with performance. At high workloads, it seems that power output is more limited by the transition from pull to push phase than at low workloads. It is suggested that successful athletes demonstrate small alterations of their kinematic profile due to increasing workloads. Future studies should replicate and expand the test spectrum (sprint and continuous loads) as well as use methods like surface electromyography (sEMG) with elite handcyclists. 相似文献
952.
953.
954.
Sandra Kay Brigance 《Performance Improvement》2011,50(10):43-48
With the increase in demand for online education at the university level has also come the “recognition that in order to be effective, such programs cannot simply be on‐line replicas of the instruction delivered in classrooms” (Reiser, 2001, p. 64). An environment of collaboration with a shared vision is needed to bring faculty expertise together with online learning design and technological expertise. This article addresses why and how instructional designers should lead the way. 相似文献