Dynamics of the martial arts high front kick

Fast unloaded movements (i.e. striking, throwing and kicking) are typically performed in a proximo‐distal sequence, where initially high proximal segments accelerate while distal segments lag behind, after which proximal segments decelerate while distal segments accelerate. The aims of this study were to examine whether proximal segment deceleration is performed actively by antagonist muscles or is a passive consequence of distal segment movement, and whether distal segment acceleration is enhanced by proximal segment deceleration. Seventeen skilled taekwon‐do practitioners were filmed using a high‐speed camera while performing a high front kick. During kicking, EMG recordings were obtained from five major lower extremity muscles. Based on the kinematic data, inverse dynamics computations were performed yielding muscle moments and motion‐dependent moments. The results indicated that thigh deceleration was caused by motion‐dependent moments arising from lower leg motion and not by active deceleration. This was supported by the EMG recordings. Lower leg acceleration was caused partly by a knee extensor muscle moment and partly by a motion‐dependent moment arising from thigh angular velocity. Thus, lower leg acceleration was not enhanced by thigh deceleration. On the contrary, thigh deceleration, although not desirable, is unavoidable because of lower leg acceleration.     

Texts

Made in America: Immigrant Students in Our Public Schools. Laurie Olsen, New York: The New Press, 1997, 276 pages, $25.00 (hardcover), ISBN 1–5658–4400–9, and $14.95 (softcover), ISBN 1–5658–4471–8.

The Power of Their Ideas: Lessons for America From a Small School in Harlem. Deborah Meier, Boston: Beacon Press, 1995, 190 pages, $12.00 (softcover). ISBN 0–8070–3111–9.

Yesterday, Today & Tomorrow: Meeting the Challenge of Our Multicultural America & Beyond. Paul D. Christiansen and Michelle Young, San Francisco: Gaddo Gap Press, 1996, 376 pages, $29.95 (softcover). ISBN 1–8801–9218–7.     

刍议"以德治国"

江泽民同志提出的“以德治国”思想是指把道德作为管理国家、调控社会的手段,来指导国家各项方针、政策的创制、实施和执行。它的提出,是对历史上“德治”思想的总结与提升,并有其丰富的理论和现实基础;民主的道德性理论、政治社会化理论、治国方略理论和德法辩证关系等。当然,在实施“以德治国”的过程中,我们还必须处理好以下几个方面的问题;坚持邓小平理论的指导、营造舆论文化环境、加强道德教育和加强党的领导等。     

高等教育适应入世要求的差距分析及对策探讨

适应加入WTO形势，我国高等教育必须针对立法和教育行政管理方面入世要求存在的差距，建立和完善与WTO规则对接的教育法规体系，转变教育行政管理职能。包括从教育参与者向“教育市场”秩序维护者转变，从客观行政管理向宏观调控转变，从集权向集权分权相结合转变，从全能管理向有限管理转变等。     

论教育知识发展的实质

教育知识是人类对教育进行认识的结果,它经历了漫长的历史发展过程,其最高形式就是体系化的教育学。教育知识发展,概括地讲,就是教育知识类型的不断丰富、教育知识体系的不断成熟和教育知识反思的不断自觉过程。这既是教育知识历史的实际进程,也是教育知识发展的实质性内容。     

English phonological awareness in bilinguals: a cross‐linguistic study of Tamil,Malay and Chinese English‐language learners

To test the lexical restructuring hypothesis among bilingual English‐language learners, English phonological awareness (PA), English vocabulary and ethnic language vocabulary (Mandarin Chinese, Malay or Tamil) were assessed among 284 kindergarteners (168 Chinese, 71 Malays and 45 Tamils) in Singapore. A multi‐level regression analysis showed that English vocabulary, in interaction with mother's education, statistically significantly predicted Singaporean children's PA; ethnic language vocabulary did not. Thus, the present study supports the lexical restructuring hypothesis that growth in vocabulary changes how lexical items are stored, leading to the development of PA. Home language practices, as represented by mother's education, may also enhance children's PA after a threshold of English vocabulary is reached. In addition, specific ethnic language (Chinese, Malay or Tamil) was a statistically significant predictor of PA, suggesting that orthographic depth as well as syllabic complexity of a bilingual's other language may influence their development of English PA.     

高校体育与健康意识

大学体育教育作为青年学生从学校走向社会的最后阶段，应从传统的教育方式中摆脱出来，以增进健康、增加知识，培养学生自我保健意识与终身体育习惯，以便将来健康地为社会工作。