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Kelly R. Sheerin Thor F. Besier Duncan Reid Patria A. Hume 《Sports biomechanics / International Society of Biomechanics in Sports》2018,17(4):531-540
Tibial acceleration is a surrogate measure for impact loading and lower limb fatigue injury in runners. Triaxial accelerometers may offer reliable and practical measurement of resultant peak tibial acceleration (PTA). With such potential in mind, this study examined variability and measurement reliability of tibial acceleration in 14 runners at baseline at one week, and eight of the runners again at six months. Triaxial accelerometers were attached to the distal tibiae of runners before they ran on a treadmill for two minutes each, at speeds of 2.7, 3.0, 3.3 and 3.7 m/s in standardised shoes. Resultant PTAs were calculated for each speed and session. Reliability outcomes were presented as percentage change and effect sizes. Variability outcomes included intraclass correlation coefficients and the typical error of the measurement. Smallest worthwhile change and performance/noise ratio were also calculated. While runners demonstrated marginally lower reliability and higher variability over six months, compared to one week, in all cases the measures of reliability and variability were of ‘good’ to ‘moderate’ reliability, and ‘small’ to ‘moderate’ variability using magnitude-based inferences. We can be confident that resultant PTA can be used with runners to assess and monitor their impacts throughout a six-month intervention. 相似文献
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Thor Arnfinn Kleven 《Scandinavian Journal of Educational Research》2013,57(4):287-294
A general common sense model of interactive teacher decisions is presented. The model assumes that the teacher wishes to choose actions that are appropriate to the situation and to the goals of her teaching. The decision process is thought to include perception, judgement and choice of behaviour from the teacher's behavioural repertoire, but as a result of the immediacy of classroom situations and the teacher's limited information processing capacity, the process may be partly unconscious and the decisions seem spontaneous. The process is affected, consciously or unconsciously, by knowledge variables and emotional variables. Interactive teaching is viewed as consisting of a series of such situations. Research on teacher decision‐making in simulated classroom situations is recommended. It is suggested that teacher education should include discussion of classroom situations and training in interactive decision‐making and the value of such programmes should be studied. 相似文献
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Discoloured 18-carat gold decorations from Sweden have been analysed by scanning electron microscopy with energy dispersive X-ray spectroscopy and X-ray electron spectroscopy (XPS)/electron spectroscopy for chemical analysis (electron spectroscopy).The original gold composition was close to 75% gold, 13% silver, and 12% copper. After manufacture, many details were boiled in sulphuric acid. As a consequence of this, the surfaces are irregular and porous with a gold concentration around 90% and with less than 1% copper. With XPS the outermost 10–20 atomic layers could be examined. No copper was present here, and the silver concentration was significantly higher. Also carbon, sulphur, oxygen, and (in one case) chlorine were present. The valence numbers indicated that gold only occurred in its metallic state, while silver (as Ag+) was preferably associated with sulphur to form black silver sulphide (Ag2S). The grey discolorations are basically due to silver sulphide and organic dirt. Sometimes green, violet, and ‘copper-shining’ colours occur, presumably as a result of light refraction phenomena. 相似文献
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Earlier reports have shown that prospective teachers' conceptions about teaching science to a high degree are resistant and do not change substantially during the teacher‐training programme. In our investigation we elucidate the prospective teachers' initial conceptions about pupils' understanding of science and mathematics. We applied ‘The Lesson Preparation Method' and used a phenomenographic approach in order to reveal the range of conceptions that the prospective teachers hold. A third of the prospective teachers did not consider pupils' conceptions when planning lessons. The rest of the 32 participants expressed awareness; some of the prospective teachers even referred to subject‐specific teaching experience. Also regarding the prospective teachers' conceptions about pupils' knowledge and beliefs, as well as about pupils' difficulties, there was a significant diversity. By raising these issues about pedagogical content knowledge the prospective teachers' conceptions can be extended and developed during the education. 相似文献
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Play-solicitation and social investigatory behaviors were observed in male and female juvenile rats exposed to playful and nonplayful juvenile social stimuli. A nonplayful state was induced by treatment with scopolamine HBr. In Experiment 1, the play-solicitation behavior of males exposed to nonplayful stimuli was reliably greater than that of females; social investigation did not differ by gender. In Experiment 2, males and females were exposed to nonplayful male and female stimuli. Male subjects engaged in more soliciting than did female subjects, and male social stimuli were subjected to more soliciting than were female social stimuli. Experiment 3 compared the influence of varying social deprivation intervals on play soliciting by male juveniles. Although social investigation did not vary reliably with interval of social deprivation, play soliciting increased reliably with longer intervals of isolation. In Experiment 4, play-soliciting behavior of males exposed to nonplayful males correlated positively and reliably with play fighting behavior upon exposure to normally playful males. The results support the proposal that some specific behaviors functionally provoke interactive play fighting. 相似文献
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This article reviews the Maricopa Integrated Risk Assessment (MIRA) project and discusses its challenges and successes. Strategies and resources are offered for assisting community college administrators, faculty, and staff to successfully implement enterprise risk management at their institutions. 相似文献
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Thor Arnfinn Kleven 《Scandinavian Journal of Educational Research》2013,57(3):109-130
Kleven, T. A. 1979. The Relation of the Scale Coarseness to the Dependability of Marks. Scandinavian Journal of Educational Research 23, 109‐130. The error of marks is divided into two components, genuine measurement error and grouping error. Supposing different values of the measurement error, the relation of scale coarseness to the total amount of error is studied on the basis of probability distributions of error. The analyses are performed within two models of error and with two criteria of amount of error, first on the assumption of rectangularly distributed true scores and then assuming normally distributed true scores. Though the main tendency of the results is that the amount of error increases as the number of scale divisions decreases, there are some variations according to the choice of model of error and criterion of amount of error, and, in case of normal distribution, according to the number of steps being even or uneven. 相似文献