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Currently, all elite high jumpers use the Fosbury Flop technique with a curved approach. This suggests that the curved approach presents some clear advantage, although there is no general agreement upon the mechanism or the mechanics. This study aimed to determine the characteristics of the approach curve and to investigate how it contributes to the generation of somersault rotation. A simple theoretical model was used to demonstrate that a tightening approach curve would change the inward lean towards the centre of the curve into outwards lean. Three-dimensional video analysis was used to record the performances of two elite male high jumpers in competition. It was found that in each case the radius of the approach curve and the inward lean angle both decreased towards the end of the approach. The amount of outward lean angular velocity generated was shown to be a major proportion of the required somersault angular velocity for a jump. It was concluded that the main advantage of a curved approach was that it resulted in the generation of somersault velocity providing the curve tightened towards the end of the approach. 相似文献
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This study examined whether the longitudinal links between mothers' use of spanking and children's externalizing behaviors are moderated by family race/ethnicity, as would be predicted by cultural normativeness theory, once mean differences in frequency of use are controlled. A nationally representative sample of White, Black, Hispanic, and Asian American families (n = 11,044) was used to test a cross-lagged path model from 5 to 8 years old. While race/ethnic differences were observed in the frequency of spanking, no differences were found in the associations of spanking and externalizing over time: Early spanking predicted increases in children's externalizing while early child externalizing elicited more spanking over time across all race/ethnic groups. 相似文献
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Kevin Brownlow Marshall Deutelbaum R.W. Sexton B.F. Betts Ross Thorne Roger Brett 《Communication Booknotes Quarterly》2013,44(1):17-20
Kevin Brownlow The War, the West and the Wilderness (New York; Alfred A. Knopf, 1979 – $27.50, hardcover). Marshall Deutelbaum, "Image" on the Art and Evolution of the Film (New York: Dover Publications, 1979 – $8.95 in paper). American Theatres of Today, Volumes I and II, by R.W. Sexton and B.F. Betts (New Yorks Architectural Book Publishing Inc., 1927 and 1930 – reprinted at $35.00 in one volume, 360 pages, hardcover). Picture Palace Architecture in Australia by Ross Thorne (South Melbourne: Sun Books, 1976 – $9.95 in paper from Vestal). Temples of Illusion by Roger Brett($14.95, paper). Carol Herselle Krinsky Rockefeller Center (New York: Oxford University Press, 1978 – $17.50 hardcover/ $9.95 paper) Richard Taylor Film Propaganda: Soviet Russia and Nazi Germany (London: Croom Helm/ New York: Barnes & Nonle, 1979—$25.00) William Kittredge and Steren M. Krauzer, eds. Stories into Film (New York: Harper & RowP2olophon Books, 1979—price not given, paper) Richard Dyer Stars (London: British Film Institute, 1979—E2.25, or about $5.00, paper) 相似文献
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Steven S. Sexton 《Compare》2011,41(1):59-74
This paper reports on an initial teacher education programme that has been designed to facilitate and support Māori student teachers in New Zealand. This paper highlights the ambiguity in New Zealand on the theoretical foundation of initial teacher education. Therefore a background on transformative praxis and how it has impacted on the education system of New Zealand is first presented. Then the tauira’s (student teacher’s) narrative is presented which has been informed by two years of a Te Ao Māori (Māori worldview) programme. The programme was built upon critical theory to facilitate transformative praxis in student teachers. Specifically, this narrative was a vehicle for how her own past in mainstream education and the programme has impacted upon how she sees teaching and being the teacher. The paper highlights the positive impact a culturally responsive programme can have on the self‐efficacy of marginalised members of society. 相似文献
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Teresa U. Berry Steven D. Milewski Manda C. Sexton Allison L. Sharp 《Public Services Quarterly》2020,16(2):71-82
AbstractCitation management programs are tools used to organize references and to create citations and bibliographies. Libraries are often the central point for providing training and support in using these tools. To determine how we could improve our support and training services, we surveyed users to determine what software in being used, why they chose that particular program, what features are important, and how they use citation management programs to collaborate. Results indicate that users chose a particular program because it was freely available or recommended to them by others and that they thought that importing references and creating citations were important features. We also found a majority of respondents used citation management programs to collaborate and turned to the library for training and support. 相似文献
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