Investigation of snowboard stiffness and camber characteristics for different riding styles     

A. Subic  P. Clifton  J. Beneyto-Ferre  A. LeFlohic  Y. Sato  V. Pichon 《Sports Engineering》2009,11(2):93-101

Previous research has indicated that the flex pattern and camber of a snowboard are crucial to its perceived “feel”, or the physical and psychological feedback given to the rider whilst snowboarding. These features are the primary cause of variation in snowboard performance for different riding styles. Consequently, this article deals with the identification of stiffness and camber characteristics for freestyle, freeride and versatile test boards, and their statistical correlation to a comprehensive list of qualitative feel-based performance requirements. It has been determined that the test boards spanning the major styles all possessed similar bending profiles, that were highly representative of each snowboard’s respective thickness distribution. The torsional stiffness curves however appeared to be driven by the composite architecture used in construction. Unsurprisingly, the freeride test board showed the greatest level of overall stiffness. The versatile board exhibited the greatest fluctuation in bending stiffness along the chord, whereas the freestyle profile was far more even throughout, with less variation from tip to tail. All of the subjective performance parameters except forgiveness showed positive associations to the body stiffness and camber, with manoeuvrability exhibiting the strongest correlations. The forgiveness showed the exact opposite trend, implying that higher levels of flex and less camber promotes a forgiving snowboard.  相似文献   

The effect of biofeedback training on affective regulation and simulated car-racing performance: a multiple case study analysis     

Edmonds WA  Tenenbaum G  Mann DT  Johnson M  Kamata A 《Journal of sports sciences》2008,26(7):761-773

The foundation of this study was based on an idiosyncratic concept, which uses probabilistic determinations (Kamata, Tenenbaum, & Hanin, 2002) to verify the utility and effectiveness of a biofeedback intervention by manipulating affective performance states in a race-car simulator. Nine males completed five separate time-trials of a simulated racing task and were then randomly assigned to one of three arousal regulation treatment conditions: (1) optimal, (2) poor, and (3) attention control. Following the biofeedback intervention, participants underwent another series of race trials to determine the effectiveness of the arousal regulation intervention. The results indicated that there were relative similarities in the strength and direction of the perceived and physiological states between the participants; however, the subtle details of the participants' unique performance zones and the probability of achieving each zone were revealed to be unique among the participants. The results also indicated that: (a) the biofeedback manipulation resulted in the expected changes for each participant, and (b) there were some large individual differences among the participants, necessitating the idiosyncratic approach. Limitations and future directions are also addressed.  相似文献   

THE STRUCTURE AND PROCESS OF SELF     

GLADYS Y. KOO 《Educational theory》1964,14(2):111-132

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Influence of the perception of biological or non-biological motion on movement execution     

Bouquet CA  Gaurier V  Shipley T  Toussaint L  Blandin Y 《Journal of sports sciences》2007,25(5):519-530

The perception of a human actor performing movements may involve processes related to action execution. This resonance of the motor system may support observational learning and imitation, and could also explain the fact that observers'/actors' movements are disturbed by the observation of a human model making different movements (Kilner et al., 2003). In this study, we tried to specify what information available in the model's behaviour triggers this influence on an observer's behaviour. In two experiments, we had participants make horizontal or vertical arm movements while observing similar movements. In the first experiment, the observers' pattern of behaviour was affected by the observation of a human model making incongruent movements. In the second experiment, similar results were obtained with participants observing a moving dot depicting either biological or non-biological motion. Movement execution was affected differentially by biological and non-biological motion observation. These results show that an observer's behaviour is sensitive to information available in biological motion.  相似文献   

Political and Legal Prerequisites for the Formation of the Modern Policy of the Republic of Kazakhstan in the Field of Higher Education     

Khvedelidze  Teimuraz B.  Toleubekova  Bakhitzhan Kh.  Sailibayeva  Zhanel Y.  Tynybekova  Zulfiyat K. 《Interchange》2021,52(3):377-391

Interchange - This research is relevant, as higher professional education has a large-scale impact on civilisation, the level of social, socio-economic, technological development and has a powerful...  相似文献   

Building a World-class Comprehensive,Innovative, Intelligent and Benchmarking Academic Library in an All-round Way: Summari- zing the Effectiveness of Peking University Library 2019-2022 Ac- tion Platform北大核心     

陈建龙  刘素清  刘宇初 《中国图书馆学报》2023,49(5):14-25

2018年，北京大学图书馆于建馆120周年之际研究制定了面向2035年愿景的《北京大学图书馆2019—2022年行动纲领》。在《行动纲领》引领下，北京大学图书馆牢固树立“用户导向、服务至上”基本理念，坚持“固本应变、服务转型、综合改革、立杆引领”等重要方针，持续完善文献保障和信息服务体系，扎实推进图书馆治理体系和治理能力现代化，创新驱动图书馆事业现代化转型发展，开创了发展根基更坚实、新型服务更有效、综合改革更深入、引领作用更突出的崭新局面，基本建成了世界一流的综合性、创新型、智能化、标杆位大学图书馆。本文从固本培元、服务创新、人本改革、标杆引领四个方面对《行动纲领》实施以来的工作实绩和用户效用进行总结和述评，以期为业界提供借鉴和参考。参考文献4。  相似文献   

Evaluation of the Role of Routine Laboratory Biomarkers in COVID-19 Patients: Perspective from a Tertiary Care Hospital in India     

Barnali Das  Seema Y. Bhatia  Poonam M. Pal 《Indian journal of clinical biochemistry : IJCB》2021,36(4):473

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Development and validation of perceptions of online interaction scale     

Ayşe Bağrıacık Yılmaz 《Interactive Learning Environments》2018,26(3):337-354

The aim of this study was to develop a measurement instrument which is compatible with literature, of which validity and reliability are proved with the aim of determining interaction perceived by learners in online learning environments. Accordingly, literature review was made, and outline form of the scale was formed with item pool by taking 14 expert opinions. As a result of exploratory factor analysis of data obtained from participation of 177 learners from eight different universities, it was seen that the scale consisted of 30 items and 3 dimensions. These dimensions are learner–content interaction, learner–instructor interaction and learner–learner interaction. Cronbach Alpha reliability coefficient of the whole scale was .95. Confirmatory factor analysis showed that fit indexes of the structure provided a good and acceptable fit. Based on these findings, Perceptions of Online Interaction Scale is a valid and reliable tool that may be used in measuring interaction occurring in online learning environments.  相似文献   

Reviews     

John Hedley Brooke  Terry Dartnall  Celia Roberts  Sally Newcomb  Rafe Champion  Andrew Milne  Martin Kelly  Wendy Varney  Orin Thomas  Craig R. Stillwell  Leonard G. Wilson  Peter Anstey  Jay L. Garfield  Mark Colyvan  Mark Cortiula  John Merson  Nicolas Rasmussen  Nickolas Vakas  John Forge  Sunny Y. Auyang  Clair Scrine  Katharina Rowold 《Metascience》1999,8(3):444-514

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Ethnic Differences in Career,Academic, and Social Self-Appraisals Among Incoming College Freshmen     

Y. Barry Chung  William E. Sedlacek 《Journal of College Counseling》1999,2(1):14-24

Ethnic differences in self-appraisals among 2,743 incoming college freshmen were examined in this study. Results showed that (a) Asian and Black students reported lower academic and social self-appraisals than did White students, and (b) Asian students reported lower career and social self-appraisals than did Black students. Practical and research implications are discussed in the article.  相似文献