THE 8.1-magnitude earthquake that struck Nepal on April 25 and its multiple aftershocks killed almost 9,000 and injured more than 20,000people.The Chinese government immediately set about organizing two rounds of emer...THE 8.1-magnitude earthquake that struck Nepal on April 25 and its multiple aftershocks killed almost 9,000 and injured more than 20,000people.The Chinese government immediately set about organizing two rounds of emergency humanitarian relief that provided 546 tons of relief materials worth RMB 60 million.The next morning the China International Search and Rescue Team was the first such team to arrive in Katmandu,Nepal’s capital.展开更多
In soccer, the bicycle kick has provided view- ers moments of breathtaking spectacle that seem virtuosic in scope. The novelty of such moments is underscored by the rarity with which players have performed this comple...In soccer, the bicycle kick has provided view- ers moments of breathtaking spectacle that seem virtuosic in scope. The novelty of such moments is underscored by the rarity with which players have performed this complex skill during national or international tournaments. The rarity of these occurrences is both a product of perceptions that it is a high-risk, low return skill and by the fact that there is a dearth of scientific research on the biomechanics of the technique. Two genera can be discerned based on starting position： 1） back-facing the goal, and 2） side-fac- ing the goal. The current study, using 3D motion capture technology and full-body biomechanical modeling, identi- fies elements that govern entrainment of the technique by examining jumping, kicking and falling phases of the skill execution. Motor sequencing during the first two phases can be characterized by analyzing the following pa- rameters： 1） angle between the player＇s thighs （humerus bones） upon take-off, 2） the whip-like control of the kicking leg, 3） timing between ball motion and joint co- ordination and, for the side-facing bicycle kick, 4） rotation of the player＇s trunk during the jumping phase. Dispersion of energy during falling after the kick is accomplished by sharing the load using a sequence of partial landings. Collectively, this information could help entrainment of the skill. Virtuosic in appearance, more frequent use of the kick can only enhance the excitement of the game.展开更多
文摘THE 8.1-magnitude earthquake that struck Nepal on April 25 and its multiple aftershocks killed almost 9,000 and injured more than 20,000people.The Chinese government immediately set about organizing two rounds of emergency humanitarian relief that provided 546 tons of relief materials worth RMB 60 million.The next morning the China International Search and Rescue Team was the first such team to arrive in Katmandu,Nepal’s capital.
基金supported by National Sciences and Engineering Research Council of Canada
文摘In soccer, the bicycle kick has provided view- ers moments of breathtaking spectacle that seem virtuosic in scope. The novelty of such moments is underscored by the rarity with which players have performed this complex skill during national or international tournaments. The rarity of these occurrences is both a product of perceptions that it is a high-risk, low return skill and by the fact that there is a dearth of scientific research on the biomechanics of the technique. Two genera can be discerned based on starting position： 1） back-facing the goal, and 2） side-fac- ing the goal. The current study, using 3D motion capture technology and full-body biomechanical modeling, identi- fies elements that govern entrainment of the technique by examining jumping, kicking and falling phases of the skill execution. Motor sequencing during the first two phases can be characterized by analyzing the following pa- rameters： 1） angle between the player＇s thighs （humerus bones） upon take-off, 2） the whip-like control of the kicking leg, 3） timing between ball motion and joint co- ordination and, for the side-facing bicycle kick, 4） rotation of the player＇s trunk during the jumping phase. Dispersion of energy during falling after the kick is accomplished by sharing the load using a sequence of partial landings. Collectively, this information could help entrainment of the skill. Virtuosic in appearance, more frequent use of the kick can only enhance the excitement of the game.
