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Bixler B Pease D Fairhurst F 《Sports biomechanics / International Society of Biomechanics in Sports》2007,6(1):81-98
The aim of this study was to build an accurate computer-based model to study the water flow and drag force characteristics around and acting upon the human body while in a submerged streamlined position. Comparisons of total drag force were performed between an actual swimmer, a virtual computational fluid dynamics (CFD) model of the swimmer, and an actual mannequin based on the virtual model. Drag forces were determined for velocities between 1.5 m/s and 2.25 m/s (representative of the velocities demonstrated in elite competition). The drag forces calculated from the virtual model using CFD were found to be within 4% of the experimentally determined values for the mannequin. The mannequin drag was found to be 18% less than the drag of the swimmer at each velocity examined. This study has determined the accuracy of using CFD for the analysis of the hydrodynamics of swimming and has allowed for the improved understanding of the relative contributions of various forms of drag to the total drag force experienced by submerged swimmers. 相似文献
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Tanya Anne Serry Anne Castles Fiona K. Mensah Edith L. Bavin Patricia Eadie Angela Pezic 《Australian Journal of Learning Difficulties》2015,20(1):83-102
The paper reports on a study designed to develop a risk model that can best predict single-word spelling in seven-year-old children when they were aged 4 and 5. Test measures, personal characteristics and environmental influences were all considered as variables from a community sample of 971 children. Strong concurrent correlations were found between single-word spelling and single-word reading while expressive language and, to a lesser extent, receptive language were less strongly correlated. Predictors of single-word spelling at ages 4 and 5 were dominated by child-related factors such as letter knowledge, a history of speech impairment and expressive language along with maternal word reading ability. Based on the strength of the predictive factors identified at both age 4 and 5, our results provide initial support for using a targeted model for screening pre-schoolers at risk of not mastering spelling in a timely manner. 相似文献
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Reducing Risk for Substance Use by Economically Disadvantaged Young Men: Positive Family Environments and Pathways to Educational Attainment 下载免费PDF全文
Monica J. Martin Rand D. Conger Stephanie L. Sitnick April S. Masarik Erika E. Forbes Daniel S. Shaw 《Child development》2015,86(6):1719-1737
Using prospective, longitudinal data spanning 10 years (age = 10–20) from a study of 295 economically disadvantaged males, the current investigation evaluated a developmental model that links early family environment and later educational aspirations, extracurricular activities, and educational attainment to substance use in early adulthood. The results indicate that a positive family environment during adolescence (low family conflict, high family warmth, and effective child management) predicted educational involvements during adolescence that promoted educational attainment during early adulthood. Finally, higher levels of educational attainment were associated with less substance use in early adulthood, even after controlling for adolescent substance use. These findings suggest that positive parenting promotes educational achievements that increase resilience to substance use for economically disadvantaged males. 相似文献
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Joan Forbes Elspeth McCartney 《Discourse: Studies in the Cultural Politics of Education》2015,36(1):144-159
This paper analyses a specific disjunctive policy space in Scotland involving the current key children's social and educational policy agenda, Getting it Right for Every Child (GIRFEC), and a recent national report on teacher education, the ‘Donaldson Report’. In four main parts, the paper first introduces and applies in policy review and analysis a capitals frame to identify the policy–practice discontinuities currently inherent in the ‘GIRFEC-child practitioner education’ policy space, exemplified by the Donaldson Report. Then, the same capitals frame is applied to examine the capitals resources demanded in the particular ‘child–child practitioner education’ policy space previously delineated. Next, examples of policy disconnects amongst current child practice and practitioner education policy production and implementation, which warrant a concerted integrative cross-sector project to ensure coherent social and intellectual capital relations at all levels, are discussed. Finally, the paper calls for the governing professional registration bodies and universities involved in the education of child-sector practitioners to engage in the redesign of university programmes underpinned by principles of transdisciplinarity and transprofessionalism. The methodology is policy sociology and policy text analysis. 相似文献
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This paper reports on a case study of an online pre-service teacher education course in a New Zealand university aimed at exploring the potential of student-generated podcasts as a form of interactive formative assessment at a distance. The study was part of a wider two-year funded project with the overall goal of documenting, developing, and disseminating effective and innovative e-learning practice. Findings from lecturer and tutor interviews, student focus group (FG) discussion, and course evaluations indicate that the podcasting task provided opportunities for the course lecturer, tutors, and students to learn and share ideas with one another. The experience empowered students to develop the skills and confidence to initiate more independent inquiry into technologies to support their pedagogical purposes. The study contributes to a better understanding of the skills, dispositions, and knowledge needed to prepare teacher candidates for teaching-learning contexts where information and communication technologies are increasingly pivotal. 相似文献
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Transitions from education into work, or as part of career change and development, are increasingly central to policy debate and academic inquiry. However, the role that employers play in shaping transition is often overlooked. In this paper, we examine this issue through the experiences of a graduating cohort of ‘degree apprentices’. We present original analysis of new empirical data from what we believe to be the first substantive qualitative longitudinal research conducted with those experiencing this new vocational pathway in the English Apprenticeships system. Through analysis of repeat semi-structured interviews with 22 degree apprenticeship graduates (44 interviews in total), we provide early empirical insights into experiences of this new pathway and add to existing theoretical conceptualisations of transition within the educational literature and the employer's role within it. We show that the degree apprentice to graduate transition can be broken down into three key stages: ‘getting in’, ‘getting on’ and ‘going further’, and that employers—at both strategic and relational levels—shape experiences at each stage. 相似文献