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The aim of this study was to examine the relationship between shoulder alignment and elbow angle during the delivery action of fast-medium bowlers. The elbow and upper trunk alignment were recorded for 13 high-performance bowlers (mean age 20 years) using a 12-camera Vicon motion analysis system operating at 250 Hz. The three highest velocity trials for "good" and "short" length deliveries were analysed. Results showed that bowlers with a more front-on shoulder alignment at back-foot impact and when the upper arm was horizontal to the ground experienced a significantly greater elbow flexion--extension range when compared with those who had a more side-on orientation at the same point in the delivery action. Bowlers with greater shoulder counter-rotation also recorded higher elbow flexion and subsequently extension during the period from upper arm horizontal to ball release. Shoulder alignment and elbow angles were similar for "short" and "good" length deliveries. It was concluded that bowlers with a more front-on shoulder orientation at back-foot impact demonstrated a higher elbow extension from upper arm horizontal to ball release and are therefore more likely to infringe International Cricket Council elbow tolerance levels, compared with those who adopt a more side-on shoulder orientation at back-foot impact. 相似文献
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Daryl Dugas 《Clearing house (Menasha, Wis.)》2017,90(2):41-47
Differentiated instruction is a set of strategies to help teachers meet each child where he or she is in order to improve students' engagement, lead them to do their best work, and maximize their success. This article describes a differentiated classroom management approach based in group dynamics which focuses on the development of group norms and roles. By teaching students about task and social-emotional roles, and about positive and negative roles, this approach provides venues for talking about student misbehaviors in a constructive way, helps students understand roles as something they choose rather than something they are, and gives every student new ways to shine in class by helping them discover their own unique roles that can contribute positively to the whole classroom group. 相似文献
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Contrasting adult literacy learners with and without specific learning disabilities This study of 311 adult education (AE) learners found 29% self-reported having a specific learning disability (SLD). Significant differences in demographic, academic, and life experience variables between the adult learners with and without SLD included: prior participation in special education, having both an SLD diagnosis and a high school diploma, low reading scores, middle age, and negative perceptions about limitations due to reading abilities. A post-hoc regression analysis found SLD status significantly contributes to variance in reading level when controlling for age and IQ. From these findings we conclude that SLD status should be considered an educationally relevant variable in adult education that warrants a diagnostic or clinical teaching approach. 相似文献
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Effects of microcomputer-based laboratories and level of cognitive development on tenth-grade biology students' ability to construct and interpret line graphs was investigated. Fortysix students enrolled in general biology classes at a rural high school volunteered to participate in the study. These students were administered instruments to assess level of cognitive development and line-graphing ability. Ten students that scored between zero and three and ten students that scored between six and ten on the graphing assessment were chosen to participate in the study. The 20 students were then assigned to either experimental or conventional groups to achieve a matched design with relation to gender and line-graphing ability. Statistical analysis of the data indicated no effect due to instructional method on graph-interpretation abilities. An instructional effect was demonstrated for graph-construction tasks (p < 0.10) with the conventional group outperforming the microcomputer-based laboratory group. Effect sizes of ?1.01 and 0.48 were found for graph-construction and -interpretation skills, respectively. Effects related to cognitive development were indicated with those students classified as high cognitive development outscoring those classified as low (p < 0.10) This was true for both graph-construction and graph-interpretation tasks. No two-way interactions were found. 相似文献
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WormBase is an open-access model-organism database that provides current and accurate genetic information of C. elegans and related nematodes. Users can search WormBase by several fields, including a gene or human disease. A special feature of the database is the inclusion of micropublications, peer-reviewed data that may go unpublished in traditional venues. 相似文献