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971.
Coventry E Sands WA Smith SL 《Sports biomechanics / International Society of Biomechanics in Sports》2006,5(1):63-75
Gymnastics vaulting relies on a specialized take-off board for propulsion during the take-off phase of the vault. There is little information on the vault board and its behaviour. The aim of this study was to characterize the behaviour of the vault board during handspring drill take-offs of young male gymnasts (n = 36). The side of the top surface of the vault board and the wooden base were marked with three reflective markers, placed at the end of the vault board nearest the vault table and the centres of the two rearmost coil springs. The vault board surface was divided into two areas, rear and middle, based on marker location. The gymnasts' groups were determined from the location of the gymnast's lateral malleolus at vault board contact. Landings with the malleolus directly above or behind the rearmost marker were considered rear landings; landings with the malleolus forward of the rearmost marker were considered middle landings. Marker movements were automatically digitized and the right malleolus was hand digitized at 120 Hz. The maximum vertical displacement, vertical deflection time, and vertical velocity at take-off of the vault board markers did not differ statistically between board contact groups (all p > 0.05). The lateral malleolus velocity components also did not differ between board contact groups. Some low to moderately strong correlations were observed between the various marker displacements, durations and take-off velocities. Modest correlations were obtained between board markers and right malleolus velocities. The results indicate that foot contact on the vault board, as defined here, did not result in differences in board marker behaviour or right lateral malleolus velocities. This information does not support the idea that vault board contacts at the rear of the vault board are worse than contacts near the middle of the vault board. More research is needed to ascertain the role of the vault board's vibration characteristics to whole body actions that are observed in the subsequent preflight phase. 相似文献
972.
973.
Dee Knoblauch 《Multicultural Perspectives》2016,18(4):209-213
This article is an analysis of picture books and chapter books involving lesbian, gay, bisexual, and/or transgender characters. Over 30 picture and chapter books were reviewed, each of which would be appropriate for use in elementary classrooms. For grades K–2, several picture books highlight different types of families, including families that have two moms or two dads. For grades 3–5, four chapter books that subtly and matter-of-factly include same-sex parents or lesbian, gay, bisexual and/or transgender characters are recommended. A discussion focuses on the significance of including lesbian, gay, bisexual, and/or transgender families and characters in the school-sanctioned curriculum beginning in the elementary grades. Families with same-sex parents is an increasing demographic in the United States; an inclusive curriculum would allow all children to see their families represented. For elementary students with “traditional” families, an inclusive curriculum extends their conceptions of family, ideally building the foundation for acceptance. 相似文献
974.
Sarah M.S. Pearsall 《Cultural and Social History》2013,10(3):289-293
AbstractThis article examines the strategies and tactics of surveillance that were used by Manchester City Police in relation to anxieties about gender, sexuality, juvenile delinquency and drugs misuse in post-war England. In the early 1960s the members-only ‘coffee beat club’ became a target of police activity, resulting in a series of raids, minor prosecutions and the intensification of the licensing laws. Commenting on the relationship between police culture and youth culture, including the leisure practices of adolescent girls, this article argues that the targeting of the ‘coffee beat club’ became a motif for the defence of an older imagined social order. 相似文献
975.
In this qualitative study, the authors explore the connections between a preservice teacher education curriculum and the development of teacher identity. Focus is given to the impact Ruby Payne's (2001) A Framework for Understanding Poverty has on the ideological development of preservice special education teachers embarking on an urban practicum. Implications for teacher education are discussed. 相似文献
976.
This study extended Schilling's (2001) study by investigating program commitment among a larger (N = 12), older (M = 16.7 years), and more experienced (M = 5.96 years) sample of participants in the Project Effort Youth Leader Corps. Individual interviews elicited a greater number and specificity of themes. Program-related barriers included logistics, structure, and relationships, and personal-related barriers included perceived alternatives, personal characteristics, and "real-life" responsibilities. Similar to Schilling's (2001) earlier study, antecedents grouped under program environment, program structure, relationships, and personal characteristics. Participants also described outcomes in terms of behavior and emotional involvement but reported more themes related to leadership. Results are discussed in terms of consistencies and changes over time and implications for program development, expansion, and evaluation. 相似文献
977.
978.
Exploratory graph analysis (EGA) is a commonly applied technique intended to help social scientists discover latent variables. Yet, the results can be influenced by the methodological decisions the researcher makes along the way. In this article, we focus on the choice regarding the number of factors to retain: We compare the performance of the recently developed EGA with various traditional factor retention criteria. We use both continuous and binary data, as evidence regarding the accuracy of such criteria in the latter case is scarce. Simulation results, based on scenarios resulting from varying sample size, communalities from major factors, interfactor correlations, skewness, and correlation measure, show that EGA outperforms the traditional factor retention criteria considered in most cases in terms of bias and accuracy. In addition, we show that factor retention decisions for binary data are preferably made using Pearson, instead of tetrachoric, correlations, which is contradictory to popular belief. 相似文献
979.
ABSTRACTUniversities are now compelled to attend to metrics that (re)shape our conceptualisation of the student experience. New technologies such as learning analytics (LA) promise the ability to target personalised support to profiled ‘at risk’ students through mapping large-scale historic student engagement data such as attendance, library use, and virtual learning environment activity as well as demographic information and typical student outcomes. Yet serious ethical and implementation issues remain. Data-driven labelling of students as ‘high risk’, ‘hard to reach’ or ‘vulnerable’ creates conflict between promoting personal growth and human flourishing and treating people merely as data points. This article argues that universities must resist the assumption that numbers and algorithms alone can solve the ‘problem’ of student retention and performance; rather, LA work must be underpinned by a reconnection with the agreed values relating to the purpose of higher education, including democratic engagement, recognition of diverse and individual experience, and processes of becoming. Such a reconnection, this article contends, is possible when LA work is designed and implemented in genuine collaboration and partnership with students. 相似文献
980.
Kristy Steigerwalt Lori Fitterling Mariah Harvey Sarah McQueeny Kartsonis Marilyn DeGeus Nora Franco 《Medical reference services quarterly》2019,38(1):1-21
Health sciences libraries are often challenged to make decisions regarding physical space allocation without quantitative data to support specific user preferences. This multisite, longitudinal study sought to answer the following questions related to academic health sciences libraries: (1) Which library spaces are popular with health sciences patrons? (2) How does time of day and allocated seating space affect patron choices? (3) What similarities and differences occur in space usage across four different health sciences libraries? Results suggest health sciences libraries must develop a nuanced understanding of their patrons’ preferences to best serve patrons’ needs regarding space allocation. Libraries can benefit from these types of methodological studies that target specific populations, supporting more informed space allocation decision making. 相似文献