Interaction of wrestling shoe and competition surface: effects on coefficient of friction with implications for injury   总被引：1，自引：0，他引：1  

Newton R  Doan B  Meese M  Conroy B  Black K  Sebstianelli W  Kramer W 《Sports biomechanics / International Society of Biomechanics in Sports》2002,1(2):157-166

The purpose of this study was to determine whether there is a significant difference in the co-efficient of friction (Fc) between old versus new wrestling shoes and mats and to investigate the effect of perspiration. Fc was measured by dragging a weighted shoe over a wrestling mat surface and measuring the vertical and horizontal forces produced. Three different shoe conditions were assessed over two mat types for both wet and dry conditions for a total of 12 conditions. To simulate the wet condition, saline solution was smeared over the surface of the mat. There was a significant effect of shoe, mat, and wet/dry conditions. In addition, significant interactions of shoe by mat, shoe by dry/wet, and mat by dry/wet were observed. Overall, Fc was 36% higher for the new wrestling mat compared to the old wrestling mat. Application of the saline solution reduced Fc by 14% compared to the dry condition. Comparison of the mean Fc for all three shoe types revealed the Fc for the older design shoe was 23% to 28% lower than the brand new shoe and the worn newer design, respectively. A high Fc, such as in the new mat/new shoe combination, has the potential to increase the risk of knee and ankle injuries by fixing the foot more securely to the ground.  相似文献   

Deciding to provide a 'reader' in examinations for the General Certificate of Secondary Education (GCSE): questions about validity and 'inclusion'     

Kevin Woods 《British Journal of Special Education》2004,31(3):122-127

In England, Wales and Northern Ireland, the General Certificate of Secondary Education (GCSE) was designed as an 'inclusive' qualification, access to which has been supported by providing a 'reader' to some candidates during examinations. A candidate reading age criterion of ten years has been employed by the GCSE awarding bodies to determine eligibility for this provision. In this paper, Kevin Woods, a member of the Educational Support and Inclusion Research and Teaching Group in the Faculty of Education at the University of Manchester, examines the rationale and evidence for adopting this criterion and describes an investigation of the reading needs of a cross-sectional sample of 38 GCSE examination candidates in trial examinations. The investigation found a low level of candidate need for a reader, with candidate reading age and self-prediction being unreliable indicators of this need. Kevin Woods highlights the implications for the assessment process used to determine eligibility for a reader in GCSE examinations and pays particular attention to the feasibility and validity of including all students as eligible.  相似文献   

Student attitudes toward science-technology-society resulting from visitation to a science-technology museum     

Kevin D. Finson  Larry G. Enochs 《科学教学研究杂志》1987,24(7):593-609

Are student attitudes toward science-technology-society (TSS) affected by visitation to science-technology museums? The purpose of this study was to determine whether such visitations affected student STS attitudes, and in what ways particular factors of the visitation impacted these attitudes. Factors examined included prior classroom experience with STS, instructional methodology employed by teachers, grade level, socioeconomic status, school type (public or private), and gender. The subjects involved in the study were 194 Kansas students in grades 6-8, and their 13 classroom teachers. Data were collected via a pretest-posttest control group design by using study-specific questionnaires and the Moore-Sutman Scientific Attitudes Inventory. Results indicated that significant differences in attitudes were present between visiting and nonvisiting students and between grade levels. No significant differences were found between other factors. One possible conclusion is that sound pedagogy should be used prior to and during museum visitations as well as in the classroom.  相似文献   

Book reviews     

Kevin Clarke  Frank A. Schmidtlein 《Tertiary Education and Management》1997,3(4):343-345

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The research committee at the armidale C.A.E.     

Kevin R. Smith 《The Australian Educational Researcher》1985,12(2):55-59

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Editorial     

Kevin Wheldall  Linda Siegel 《教育心理学》2004,24(6):723-725

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‘Race’ talk! Tensions and contradictions in sport and PE     

Kevin Hylton 《Physical Education & Sport Pedagogy》2015,20(5):503-516

Background: The universal sport discourses of meritocracy and equality are so engrained that few challenge them. The most cursory interest in sport, Physical Education (PE), and society will reveal that the lived reality is quite different. Racial disparities in the leadership and administration of sport are commonplace worldwide; yet, from research into ‘race’ in sport and PE, awareness of these issues is widespread, where many know that racism takes place it is generally claimed to be somewhere else or someone else. For many, this racism is part of the game and something to manipulate to steal an advantage; for others, it is trivial. This paper explores the contradictions and tensions of the author’s experience of how sport and PE students talk about ‘race’ and racism. ‘Race’ talk is considered here in the context of passive everyday ‘race’ talk, dominant discourses in sporting cultures, and colour blindness.

Theoretical framework: Drawing on Guinier and Torres’ [2003. The Miner's Canary: Enlisting Race, Resisting Power, Transforming Democracy. London: Harvard University Press] ideas of resistance through political race consciousness and Bonilla-Silva’s [2010. Racism Without Racists: Colour-Blind Racism and the Persistence of Racial Inequality in the United States. Plymouth: Rowan and Littlefield] notion of colour blindness, the semantics of ‘race’ and racialisation in sport and PE are interrogated through the prism of critical race theory (CRT). CRT is used here to centre ‘race’ and racialised relations where disciplines have consciously or otherwise excluded them. Importantly, the centring of ‘race’ by critical race scholars has advanced a strategic and pragmatic engagement with this slippery concept that recognises its paradoxical but symbolic location in society.

Discussion: Before exploring ‘race’ talk in the classroom, using images from the sport media as a pedagogical tool, the paper considers how ‘race’ is recreated and renewed. The paper then turns to explore how the effortless turn to everyday ‘race’ talk in the classroom can be viewed as an opportunity to disrupt racialised assumptions with the potential to implicate those that passively do so. Further, the diagnostic, aspirational, and activist goals of political race consciousness are established as vehicles for a positive sociological experience in the classroom.

Conclusion: The work concludes with a consideration of the uses and dangers of passive ‘race’ talk and the value of a political race consciousness in sport and PE. Part of the explanation for the perpetuation of ‘race’ talk and the relative lack of concern with its impact on education and wider society is focused on how the sovereignty of sport and PE trumps wider social concerns of ‘race’ and racism because of at least four factors: (1) the liberal left discourses of sporting utopianism, (2) the ‘race’ logic that pervades sport, based upon the perceived equal access and fairness of sport as it coalesces with the (3) ‘incontrovertible facts’ of black and white superiority (and inferiority) in certain sports, ergo the racial justifications for patterns of activity in sport and PE, and (4) the racist logic of the Right perpetuated through a biological reductionism in sport and PE discourses.  相似文献   

Culturally responsive computing: a theory revisited     

Kimberly A. Scott  Kimberly M. Sheridan  Kevin Clark 《Learning, Media and Technology》2015,40(4):412-436

Despite multiple efforts and considerable funding, historically marginalized groups (e.g., racial minorities and women) continue not to enter or persist in the most lucrative of fields – technology. Understanding the potency of culturally responsive teaching (CRT), some technology-enrichment programs modified CRP principles to establish a culturally responsive computing (CRC) experience for disenfranchised groups. We draw from our respective praxes developing two such initiatives and reconceptualize CRC as a heuristic. In this theoretical article, we offer a more nuanced vision of CRC considering intersectionality, innovations, and technosocial activism. Implications for the newly defined tenets consider programmatic, theoretical, and methodological concerns.  相似文献   

Editorial     

Kevin Wheldall  Robyn Wheldall  Saskia Kohnen 《Australian Journal of Learning Difficulties》2015,20(1):1-2

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Microwells support high-resolution time-lapse imaging and development of preimplanted mouse embryos     

Yu-Hsiang Chung  Yi-Hsing Hsiao  Wei-Lun Kao  Chia-Hsien Hsu  Da-Jeng Yao  Chihchen Chen 《Biomicrofluidics》2015,9(2)

A vital aspect affecting the success rate of in vitro fertilization is the culture environment of the embryo. However, what is not yet comprehensively understood is the affect the biochemical, physical, and genetic requirements have over the dynamic development of human or mouse preimplantation embryos. The conventional microdrop technique often cultures embryos in groups, which limits the investigation of the microenvironment of embryos. We report an open microwell platform, which enables micropipette manipulation and culture of embryos in defined sub-microliter volumes without valves. The fluidic environment of each microwell is secluded from others by layering oil on top, allowing for non-invasive, high-resolution time-lapse microscopy, and data collection from each individual embryo without confounding factors. We have successfully cultured mouse embryos from the two-cell stage to completely hatched blastocysts inside microwells with an 89% success rate (n = 64), which is comparable to the success rate of the contemporary practice. Development timings of mouse embryos that developed into blastocysts are statistically different to those of embryos that failed to form blastocysts (p–value < 10⁻¹⁰, two-tailed Student''s t-test) and are robust indicators of the competence of the embryo to form a blastocyst in vitro with 94% sensitivity and 100% specificity. Embryos at the cleavage- or blastocyst-stage following the normal development timings were selected and transferred to the uteri of surrogate female mice. Fifteen of twenty-two (68%) blastocysts and four of ten (40%) embryos successfully developed into normal baby mice following embryo transfer. This microwell platform, which supports the development of preimplanted embryos and is low-cost, easy to fabricate and operate, we believe, opens opportunities for a wide range of applications in reproductive medicine and cell biology.  相似文献