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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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我最亲爱的姑娘: 今天早上我手里拿着一本书在散步,但像往常一样,心里想的全都是你;我真希望能说得更动听一点。日日夜夜我在忍受折磨。他们在谈论我去意大利的事。若要与你分离那么久,我是肯定康复不了的,然而尽管我这样全心地爱着你,却无法使自己信任你。我跟你长久分离,与这一事实有关的以往的体验让我痛苦,这些我很少谈起。你母亲来的时候,我会突然巧妙地问她你是否去了迪尔克夫人家,因为为了让我放心她也许会说“没有”。我确实是憔悴不堪了,这似乎成了我惟一的本钱。我难以忘记过去的事。什么事?它对世人来说不算什么,可对我来说却是致命的。我将尽力摆脱这一切。你以前常和布朗打情骂俏,若你能体会我的 相似文献
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Karen Keats Whelan Janice Huber Chuck Rose Annie Davies D. Jean Clandinin 《Teachers and Teaching》2013,19(2):143-156
Drawing on a 3-year study focusing on the shaping influences of the professional knowledge landscape on the personal practical knowledge of experienced teachers, we first explore how stories are shaped as they are told and responded to in different places and, second, explore whether or not this sharing leads to imagining new possibilities for retelling and reliving stories. By sharing and exploring a story of a disagreement between a parent and a teacher, we focus on what we do when we tell stories in schools and what we do when we tell stories off the school landscape. In making meaning from this story, we show that both in the teacher's living of the story with the parent and in her numerous recountings of the story to others on the school landscape, she did not have opportunities to figure out new ways to relive the story. In our research group, she shared her story again. In this telling, we asked her to focus on who she, the mother, and the principal are in the story, and we inquire into what plotlines each were living. We ask questions about how they were positioned as characters in relation to one another. Re-searching the story in this way enabled us to understand the embodied nature of the teacher's knowing and how this knowledge shaped the events of the story as they were lived out, particularly how the teacher's living of a relational story countered the story of teacher and principal as positioned above parent. By drawing on Nelson's work on 'found' and 'chosen' communities, we imagine ways in which schools could become chosen communities where the story of school might be one of fostering the living out of multiple stories. We imagine the stories emerging from such communities might significantly shape the landscape of schools by opening up new possibilities for living in relation with others. 相似文献
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We describe the introduction of task-orientated cooperative group work in a second year Botany course in Phycology (the study of algae) to accommodate a large class of students with varying academic and linguistic skills and a tendency to learn by rote. Students were issued with workbooks, containing study questions, readings, a discussion worksheet, and a test yourself quiz. Each of six weekly topics was introduced by a lecture or slide-tape presentation, after which students were asked to answer study questions as homework. This was followed by group discussion work in the classroom. Group discussion worksheets were collected weekly and used together with a 10-question multiple choice spot test for continuous evaluation. Interviews with students, and the results of a questionnaire indicated that they enjoyed the approach, and found that it stimulated their interest in the subject. A subjective assessment by the lecturer, based on student performance, suggests that they improved their use of higher intellectual processes. 相似文献
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Patrice A. Keats 《International journal for the advancement of counseling》2010,32(4):290-303
This paper explores the ramifications of masculinized military culture and operational stress on cross-cultural adaptation.
The author examines how characteristics of military culture may obstruct effective cross-cultural adaptation by promoting
a hypermasculinity that tends to oppose effective management of trauma, and thereby suppresses skills of social interaction
(e.g., adaptive emotional resilience, behavioral flexibility) that could assist military members with cross-cultural interactions.
Because these cultural aspects may tend to exacerbate difficulties members have when transitioning between cultures and dealing
with trauma effects, possible approaches in counseling intervention to mitigate these effects are discussed. 相似文献
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The purpose of the current study was to examine the viability of conducting a theory-based physical activity (PA) intervention on men with prostate cancer, and the impact of PA on quality of life (QOL). Participants were 31 men, average age of 67 years, with localized or metastatic prostate cancer undergoing androgen deprivation therapy (ADT). Global QOL, fatigue, and PA measures were conducted at baseline and following the 12-week intervention. An additional follow-up testing was conducted 4 months following the intervention (n = 18). Both moderate and strenuous bouts of exercise, as well as functional capacity, increased significantly from pre- to posttest. Both fatigue severity and resting heart rate decreased significantly at posttest. A trend toward improved global QOL was also noted. It was concluded that a 12-week home-based PA intervention may provide health and QOL benefits for prostate cancer patients undergoing ADT. Practitioners are encouraged to promote PA for prostate cancer survivors. 相似文献
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In the last decade institutions of higher education have received increasing pressure to reduce and/or eliminate any discriminatory actions. Affirmative action programs have been used by these institutions to comply with the letter of the law. Research shows, however, that these programs have not been highly successful in eliminating discrimination. This study was designed to assess the judgment policies of personnel and affirmative action officers in institutions of higher learning regarding the criteria necessary for effective affirmative action programs. The research identified 13 separate potential criteria. The results suggest attitudes and procedures were the most important criteria for effectiveness. Institution type (public versus private) and size (number of students) have no moderating effects. 相似文献
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