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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
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Gilbert E. Doan 《Journal of The Franklin Institute》1933,216(2):183-216
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Alyssa?R.?Gonzalez-DeHassEmail author Patricia?P.?Willems Marie?F.?Doan?Holbein 《Educational Psychology Review》2005,17(2):99-123
Parent involvement has a sound research base attesting to the many potential benefits it can offer in education. However, student motivation as an academic outcome of parental involvement has only recently been investigated. The purpose of this article is to show how parent involvement is related to students motivation. Studies of students from the elementary school to high school show a beneficial relationship between parental involvement and the following motivational constructs: school engagement, intrinsic/extrinsic motivation, perceived competence, perceived control, self-regulation, mastery goal orientation, and motivation to read. From the synthesis of the parent involvement and motivation literature, we offer potential explanations for their relationship. Directions for areas of continued research are also presented. 相似文献
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The Management & Economics Library at Purdue University began a major physical and conceptual renovation four years ago. The conceptual renovation involves a rethinking of library faculty and staff roles and responsibilities based on the library's and university's strategic directives. The LearnLab space is being used as a springboard to create new partnerships, to implement our new roles, and to transform the perspective of an academic library's present capability. This article will highlight the variety of opportunities that have arisen by leveraging the LearnLab space. 相似文献
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Today's fast paced global environment requires information professionals to be leaders keeping pace with user needs. Two academic research libraries share their work seeking to ensure and leverage the creativity in their organizations focusing on the most meaningful innovative opportunities. The premise is that usefulness and appropriateness is achieved through strategic alignment, thereby opening the door of opportunity for innovative products and services. The ability to seize the opportunity each group seeks to meet is due to the recognition by the organization of that alignment. And so, organizational perception, awareness, and value all affect the successful implementation of creativity. The products and services presented in this article, Harvard's Baker Library Historical Collections Online and Purdue University's career wiki, stem from organizational alignment, and the work of the leadership teams to influence perception, create awareness, and demonstrate value. 相似文献
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Teachers in today’s mathematics classrooms are confronted with the challenge of meeting the needs of students with diverse needs and backgrounds. The NCTM standards and the literature on diverse learners suggest that all students may benefit from strategies that promote cultural and historical connections and the use of technologies, such as Internet Field Trips, and manipulatives that focus on the active engagement of students through exploration and communications. In a passionate plea for bridging the culture gap in our classrooms, Moore (1994) proposes that, Mathematics is definitely not culture-free … no mathematics teacher could even contemplate seriously taking only the values of his culture and a textbook which is a product of his culture and imposing both himself and the textbook upon individuals possessed by a culture that diverges from his in any significant area. (p. 13) 相似文献
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Children's Emotionality Moderates the Association Between Maternal Responsiveness and Allostatic Load: Investigation Into Differential Susceptibility 
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下载免费PDF全文 While emotionality is often thought of as a risk factor, differential susceptibility theory argues that emotionality reflects susceptibility to both positive and negative environmental influences. The present study explored whether emotional children might be more susceptible to the effects of both high and low maternal responsiveness on allostatic load, a physiological indicator of chronic stress. Participants were 226 mother and child dyads. Mothers reported on children's emotionality at child age 9. Maternal responsiveness was measured at age 13 using self‐reports and behavioral observation. Allostatic load was measured at age 13 and 17 using neuroendocrine, cardiovascular, and metabolic biomarkers. Emotionality was associated with higher allostatic load if self‐reported responsiveness was low, but with lower allostatic load, when self‐reported responsiveness was high. 相似文献
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This study examined how 30 minutes of search time on the Web affected students’ essay scores in response to a writing prompt. Expository essays were obtained from 49 fourth- and fifthgrade students enrolled in an elementary school in Virginia, in the United States. Students were placed by random assignment into three groups with the same writing prompt for all three groups. Data analyses using ANOVA indicate that there was statistical significance in two components of writing. The group that received instruction on using the Internet to conduct research in the prewriting phase outperformed the control group in two areas: the total essay score (p=.053) and usage/mechanics (p=.028). The study also produced effect sizes ranging from small to large when the Internet users were compared to the control group. Implications for the future of Internet use in the school system are discussed. 相似文献
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Jordan Smith Derek Hanson Shannon N. Fanning Sara Doan 《Technical Communication Quarterly》2016,25(4):260-277
The authors examined a corpus of figure captions from technical and professional communication (TPC)-journal articles to test their sense that TPC captions do not fulfill their communicative potential as well as, they sensed, journals in science often do. The authors performed a content analysis on captions from biology-journal articles and iteratively tested a coding scheme of caption content. The resulting scheme can help in analyzing caption content, developing captions, and imparting a variety of TPC-related skills to students. 相似文献