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Rony Ibrahim Gert S. Faber Jaap H. van Dieën 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(1):45-57
Attaining high speed of the stick head and consequently of the ball is essential for successful performance of the drag flick in field hockey, but the coordination pattern used to maximise stick head speed is unknown. The kinematics of the drag flick was studied in ten elite hockey players who performed twenty shots each towards a target located 1.5 m high. A 150 Hz active marker motion analysis system was used, alongside two force plates to detect foot touchdown. Angular velocity and contribution to stick endpoint speed of upper body joints were analysed. Repeated measures ANOVA was used to compare timing of onset and peak angular velocities between joints. Participants used a kinematic pattern that was close to a proximal-to-distal sequence. Trunk axial rotation and lateral rotation towards the target, right wrist flexion and left wrist extension were the main contributors to stick endpoint speed. Coaches should emphasise trunk rotations and wrist flexion and extension movements for maximising stick head speed. Given the high level of the participants in this study, the coordination of joints motions, as reported here, can serve as a guideline for drag flick training. 相似文献
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济科:巴西有两个贝利,一个是"黑珍珠"贝利,另一个是"白贝利"济科。济科除了肤色外,连身高都与贝利一模一样。他于1976年和1977年两度被评为巴西最佳队员和最佳射手。在为弗拉门戈队效力16年间,共出赛650场,进球630个,1980年为该队夺取巴西全国冠军,1981年又夺取了南美解放者杯赛和丰田杯的冠军。济科1977年、1981年和1982年三次被评为美洲最佳运动员,1983年还被英国《足球世界》杂志评为世界最佳运动员,第十二届世界杯赛济科被列为最佳阵容。 相似文献
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Maya Kalman-Halevi Rony Tutian Yehuda Peled 《Learning disabilities research & practice》2023,38(3):239-247
This study examined the emotional costs and well-being of postsecondary students with learning disabilities (LD) and attention deficit hyperactivity disorder (ADHD) who faced a sudden shift to emergency remote teaching (ERT) during the COVID-19 pandemic. The study was conducted with 237 postsecondary students in Israel from June to July 2020. With regard to online learning, the LD/ADHD subjects reported significantly higher levels of stress, anxiety, and depression and lower well-being than their neurotypical counterparts. However, no significant differences were found in emotional costs and well-being when the same students had experienced online learning prior to the pandemic. These findings have practical implications for policymakers in academia with regard to the emotional toll of online learning among students with LD/ADHD and their specific needs when facing ERT during the COVID-19 pandemic as well as the contribution of previous online learning when facing ERT. 相似文献
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Kim Normann Andersen Rony Medaglia Ravi Vatrapu Helle Zinner Henriksen Robin GauldAuthor vitae 《Government Information Quarterly》2011,28(4):439-445
Assessing e-government responsiveness is one of the major gaps in the currently dominant e-government maturity models. While we have a relatively large pool of models focusing on technological and organizational integration from a supply side perspective, measures of responsiveness of e-government systems from a user perspective are still lacking. Replicating a study from New Zealand and Australia, this study explores the response time and quality of e-mail response in Danish local and central governments (N = 175). Despite that Denmark is high ranking in international benchmark studies, we find that one third of central government agencies did not respond at all, and close to 80% of the ministries provided none or incomplete answers. Local government responds faster and provides answers that are more complete and accurate than those provided by central government. Implications for e-government are discussed. 相似文献
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在没写信以前，我很少收集用纸做的足球相关物品以外的其它东西。随着我成为了一名信虫，陆续收到一些各种各样的足球收藏品，丰富了我的收藏。 相似文献
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我们做信虫每个人都有一个自己的方向。以前我的方向是德国和英国,久而久之,随着写信数量的增多。目标从德国、英国逐渐扩大到了西班牙、意大利等。然而德国始终是我写信的起点。有人说德国联赛不像英格兰联赛那样赏心悦目,也不像西班牙联赛充满技术含量,但我依然热爱着德国联赛。当然其中一部分原因也归功于写信的缘故。直到这个赛季,我每个赛季都保持着至少写20封信给德国的俱乐部或官员的数量,最多是一个赛季写了将近50封给德国的俱乐部。当时带着一种恒心和毅力坚持写信,想收到各个俱乐部的签名卡,虽然最后失败的也不胜枚举,但我也坚定了作为信虫的决心。 相似文献