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通过过去15年来对比赛的研究分析,对付上旋型选手的关键,主要集中在如何进行高速击球。在中国的青少年网球界里,很多教练、家长、学员,即使是在高水平的比赛和训练下,也忽视了一个事实：他们仅仅重视球的飞行速度,而忽略了球的转速。 相似文献
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Bastien Soutjis 《Journal of Cultural Economy》2020,13(1):114-131
ABSTRACTDrawing on Mallard’s contribution [2007. Performance testing: dissection of a consumerist experiment. The sociological review, 55 (2), 152–172] on the work undertaken by consumerist journals to evaluate products independently from the mediation of market players, our goal is to characterize the new digital form of the consumerist mediator by using a specific case: Yuka, a mobile application (app) enabling consumers to obtain alternative health labeling on foodstuffs. Relying on interviews, observations of the app and analysis of underlying product databases and reports on food labeling issues, we examine the new forms of consumer-to-market interactions brought about by the app, the conceptions of health inscribed in its product qualification algorithm and the operation of the database on which it is based. Our position is threefold: firstly, we argue that the relationship between the consumer and the market established by Yuka is less distant than the one established by traditional consumerist mediators. Secondly, in the case of Yuka, we argue that the market relationship is based on a compromise between scientific logic, technological uncertainty and consumer concerns. Thirdly, we claim that this case demonstrates new ways for consumerist prescribers to politically intervene on markets, but that the potential of the intervention is tied to new issues related to the openness of product data. 相似文献
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Bastien Wagener 《教育心理学》2013,33(7):849-861
In French universities, only one out of two students is successful in his/her first year. The change of the working rhythm and the importance of self-regulated learning (relying on metacognition) can to a large extent explain these dramatic rates. Metacognition, as the process of being aware of one’s own cognition and activity implies awareness and consciousness. Nowadays, its improvement has only been achieved through the training of monitoring for a specific task. Regarding awareness, techniques like meditation and relaxation (attentional practices or APs) lead to its general development. Therefore, we investigated the possible improvement of metacognition thanks to AP. We conducted a longitudinal study with two groups of students: one group took a training programme in autogenic training (an AP), and the second one received no training in awareness or metacognition. We found out that metacognition could be improved thanks to an AP. This approach could therefore be used as a global metacognitive remediation for students. 相似文献
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亲爱的读者,这个月,我来研究一个很多人问的问题,如何打败牛皮糖选手？
为什么在我和一个牛皮糖对手比赛时,我的水平忽然变的很差劲？ 相似文献
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Bastien Wagener 《Teaching in Higher Education》2018,23(2):227-242
While the number of postgraduate students is increasing, the writing of a master's dissertation still poses numerous challenges to them. The outcome of this work depends just as much on technical and methodological skills as on affects, self-regulation, and the relationship to the supervisor. In order to test a comprehensive model including all these dimensions for this specific task, we sent a questionnaire to students who had recently completed their master's thesis. The collected answers highlight the importance of the self-regulation of both cognition and affects in such an endeavor. The quality of the relationship with the supervisor is also essential. In light of these results, changes regarding the training of students and the coaching methods of supervisors seem necessary. 相似文献
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In France, there is a growing enthusiasm for outdoor sports and recreation. In the meantime, the risk of both severe and frequent injury associated with active pursuits in mountain areas is acknowledged. This paper tackles accidents related to mountain sports, with a focus on three critical activities: hiking, mountaineering and ski touring. The aim consists of estimating the actual number of accidents (whether they entailed deaths or injuries) in the three above-mentioned activities. In order to align the information collected, then provide estimations based on the reasoned crossing of these secondary data, we consulted and summarised all the databases available on the French territory. Results address the trauma-related mortality in absolute values, and a comparison with the death rate of other sports. The calculation of a mortality index, including secondary mortality, is then provided. Elements of mountain sports accidentality are also presented, intending to clarify how many casualities occur each year in the French mountains. Last, a focus on the particularities of each mountain sport is provided. 相似文献
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Execution time, kinetics, and kinematics of the mae-geri kick: comparison of national and international standard karate athletes 总被引：1，自引：1，他引：0
Little is known of the performance characteristics of the shotokan karate mae-geri kick. The aim of this study was to compare the execution time, the lower limb kinetics and kinematics, and their respective repeatability in the mae-geri kick of karate athletes of two different standards. Seventeen adult black belt karate competitors (9 national and 8 international athletes) performed six kicks with their dominant lower limb on a striking surface, combining maximum force impact and velocity. Execution time of movement and lower limb kinematics were recorded with a high-speed camera. Maximum force at impact and the forces exerted on the ground were measured using three force plates. The duration of the kick was significantly shorter for international than for national standard athletes. However, no significant difference in the maximum impact force of the kick was observed between the two groups. In addition, significant kinematic differences were observed between the groups, with two angles of motion and one velocity peak occurring sooner in the kick movement for the international athletes, specifically for the knee joint. International athletes also performed the kick with a significantly higher repeatability for duration and kinematics, specifically during the pre-loading phase that precedes the attack phase. We conclude that the duration of the kick and repeatability of lower limb kinematics could be useful in selecting top-level karate athletes and monitoring their training status. 相似文献
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In recent years, policy approaches that build upon the notion of innovation systems have enjoyed increasing attention in science, technology and innovation policy. But while the usefulness of systemic thinking in policy-making has been demonstrated in a large number of empirical settings, we still lack a detailed understanding of the dynamics at play when policy makers address systemic problems. In this paper, we show how complex interdependencies and the uncertain nature of technological change shape the process of targeted policy interventions in socio-technical systems. Toward this end we analyzed the evolution of the German feed-in tariff (FIT) system for solar photovoltaic power, a highly effective and widely copied policy instrument targeted at fostering the diffusion and development of renewable energy technologies. We find that the policy has been subject to a considerable amount of changes, many of which are the result of policy makers addressing specific system issues and bottlenecks. Interestingly, however, often these issues themselves were driven by unforeseen technological developments induced by previous policy interventions. We argue that the pattern of policy serving as both a solution to and a driver of technological bottlenecks shows strong similarities with what Rosenberg (1969) called ‘compulsive sequences’ in the development of technical systems. By shedding more light on how the characteristics of socio-technical systems affect policy interventions, our framework represents a first step toward more closely integrating the literature on innovation systems with the work on policy learning. 相似文献