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51.
Modern treadmills allow cross-country skiers, biathletes and ski-orienteer’s to test their physical performance under laboratory
conditions using classical and freestyle techniques on roller skis. The differences in performance between tests are quite
small for elite athletes, and it is therefore of great importance to control the rolling resistance of the roller skis. Otherwise
different physiological tests cannot be accurately compared. This study shows that during a warm-up period of 30 min the coefficient
of rolling resistance (μ
R) decreases to about 60–65% and 70–75% of its initial value for freestyle and classical roller skis, respectively. Simultaneous
measurements of temperature and μ
R shows that stabilized rolling resistance corresponds to a certain running temperature for a given normal force on the roller
ski. Tests were also performed on the influence on μ
R of normal force, velocity and inclination. Normal forces produced significant influence on μ
R, while different velocities and inclinations of the treadmill only resulted in small changes in μ
R. 相似文献
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Oerke Britta McElvany Nele Ohle-Peters Annika Horz Holger Ullrich Mark 《European Journal of Psychology of Education - EJPE》2019,34(2):375-395
European Journal of Psychology of Education - Reading texts with instructional pictures (text-picture integration) is a key component of students’ learning processes in most school subjects,... 相似文献
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Studying information flow between node clusters can be conceptualised as an important challenge for the knowledge management research and practice community. We are confronted with issues related to establishing links between nodes and/or clusters during the process of information flow and search transfer in large distributed networks. In the case of missing socio-technical links, social networks can be instrumental in supporting the communities of practice interested in sharing and transferring knowledge across informal links. A comprehensive review of methodology for detecting missing links is provided. The proportion of common neighbours was selected as best practice to elicit missing links from a large health insurance data set. Weights were based on geographical arrangements of providers and the dollar value of transactions. The core network was elicited based on statistical thresholds. Suspicious, possibly fraudulent, behaviour is highlighted based on social network measures of the core. Our findings are supported by a health insurance industry expert panel. 相似文献
56.
Manfred Hofer Claudia Kuhnle Britta Kilian Stefan Fries 《Learning and Instruction》2012,22(5):368-375
The predictive power of cognitive ability and self-control strength for self-reported grades and an achievement test were studied. It was expected that the variables use of time structure, academic procrastination, and motivational interference during learning further aid in predicting students’ achievement because they are operative in situations of school-leisure conflict. A sample of 697 eighth-graders was tested twice within the interval of a single school year (about eight months). Cognitive ability and self-control explained substantial variance of grade changes. Procrastination displayed a further portion of the variance. Personality variables were better predictors of grades, while cognitive ability showed higher variance with the achievement test. Variables tapping aspects of self-control strength have been interpreted as key determinants of learning outcomes. The findings suggest that it might be useful to identify students who are at risk, allowing these students to train their ability to shield studying from leisure distractions. 相似文献
57.
Martina Röthlisberger Christoph Zangger Britta Juska-Bacher 《Journal of Research in Reading》2023,46(1):1-21