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Kenny IC Wallace ES Otto SR 《Sports biomechanics / International Society of Biomechanics in Sports》2008,7(3):322-332
The aim of this study was to determine how shaft length affects golf driving performance. A range of drivers with lengths between 1.168 m and 1.270 m, representing lengths close to the 1.219 m limit imposed by R&A Rules Limited (2008), were assembled and evaluated. Clubhead and ball launch conditions and drive distance and accuracy were determined for seven category 1 golfers (handicaps 0.21 +/- 2.41) who performed shots on a purpose-built practice hole. As shaft length increased from 1.168 m to 1.270 m, initial ball velocity increased (+ 1.8 m/s, P < 0.01). Ball carry (+ 4.3 m, P = 0.152) also increased, although not significantly so. Furthermore, as shaft length increased, for all club comparisons there was no decrease in accuracy. Ball launch conditions of spin components and launch angle remained unaffected by shaft length. Launch angle increased (0.8 degree, F = 1.074, P = 0.362) as driver shaft length increased. Our results show that clubhead and ball velocity together with ball carry tended to increase with no loss of accuracy. 相似文献
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John Wallace Rachel Sheffield Leonie Rénnie Grady Venville 《The Australian Educational Researcher》2007,34(2):29-49
In Australia, and internationally, integration is a widely promoted middle school curriculum reform strategy. Integration
is claimed to engage students by providing opportunities to work on a few cross-disciplinary objectives, to apply knowledge
across the subject boundaries and to work on tasks with meaning and relevance. While these curriculum goals enjoy a certain
popularity among middle school reformers and curriculum integration adherents, in practice, the prevalence of integration
is patchy and provisional. In this article, we (re) examine two of our studies of middle school integration over the past
decade to explore the reasons for this apparent disparity between the rhetoric and the reality. In our re-search for integration,
we look back at our data to identify enabling and inhibiting conditions for curriculum reform and develop a list of key program
characteristics. Finally, we look forward, drawing on the notion of institutional resilience to speculate on the reasons why
some middle school programs seem to flourish while others wither. 相似文献
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