DIRECTORY OF SOURCES OF INFORMATION IN THE DISTRICT OF COLUMBIA     

Meyer HH 《Bulletin of the Medical Library Association》1916,5(4):47-49

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Validation of two accelerometers to determine mechanical loading of physical activities in children     

Ursina Meyer  Dominique Ernst  Silvia Schott  Claudia Riera  Jan Hattendorf  Jacqueline Romkes 《Journal of sports sciences》2015,33(16):1702-1709

The purpose of this study was to assess the validity of accelerometers using force plates (i.e., ground reaction force (GRF)) during the performance of different tasks of daily physical activity in children. Thirteen children (10.1 (range 5.4–15.7) years, 3 girls) wore two accelerometers (ActiGraph GT3X+ (ACT), GENEA (GEN)) at the hip that provide raw acceleration signals at 100 Hz. Participants completed different tasks (walking, jogging, running, landings from boxes of different height, rope skipping, dancing) on a force plate. GRF was collected for one step per trial (10 trials) for ambulatory movements and for all landings (10 trials), rope skips and dance procedures. Accelerometer outputs as peak loading (g) per activity were averaged. ANOVA, correlation analyses and Bland–Altman plots were computed to determine validity of accelerometers using GRF. There was a main effect of task with increasing acceleration values in tasks with increasing locomotion speed and landing height (P < 0.001). Data from ACT and GEN correlated with GRF (r = 0.90 and 0.89, respectively) and between each other (r = 0.98), but both accelerometers consistently overestimated GRF. The new generation of accelerometer models that allow raw signal detection are reasonably accurate to measure impact loading of bone in children, although they systematically overestimate GRF.  相似文献   

What are they asking? An analysis of the questions planned by prospective teachers when integrating literature in mathematics     

Barbara Purdum-Cassidy  Suzanne Nesmith  Rachelle D. Meyer  Sandi Cooper 《Journal of Mathematics Teacher Education》2015,18(1):79-99

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Effects of animation's speed of presentation on perceptual processing and learning     

Katja Meyer  Thorsten Rasch  Wolfgang Schnotz 《Learning and Instruction》2010,20(2):136-145

Animations presented at different speed are assumed to differentially interact with learners’ perception and cognition due to the constraints imposed by learners’ limited sensitivity to incoming dynamic information. To investigate the effects of high and low presentation speed of animation, two studies were conducted. In Study 1, participants were 55 students who learned about the functioning of a four-stroke engine from an animation with user-controlled presentation speed. In Study 2, eye movements of 19 students were analysed for different system-controlled presentation speeds of animation. Results indicated that high presentation speeds accentuated global events (i.e., macro-events), whereas low speeds accentuated local events (i.e., micro-events). However, eye movements were primarily affected by the content rather than the presentation speed of animation.  相似文献   

Bus Stop: American Eye vs. Small-Town Ear     

William E.H. Meyer 《Journal of American culture (Malden, Mass. : 2003)》1993,16(1):35-38

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A Criterion-Referenced Approach to Student Ratings of Instruction     

J. Patrick Meyer  Justin B. Doromal  Xiaoxin Wei  Shi Zhu 《Research in higher education》2017,58(5):545-567

We developed a criterion-referenced student rating of instruction (SRI) to facilitate formative assessment of teaching. It involves four dimensions of teaching quality that are grounded in current instructional design principles: Organization and structure, Assessment and feedback, Personal interactions, and Academic rigor. Using item response theory and Wright mapping methods, we describe teaching characteristics at various points along the latent continuum for each scale. These maps enable criterion-referenced score interpretation by making an explicit connection between test performance and the theoretical framework. We explain the way our Wright maps can be used to enhance an instructor’s ability to interpret scores and identify ways to refine teaching. Although our work is aimed at improving score interpretation, a criterion-referenced test is not immune to factors that may bias test scores. The literature on SRIs is filled with research on factors unrelated to teaching that may bias scores. Therefore, we also used multilevel models to evaluate the extent to which student and course characteristic may affect scores and compromise score interpretation. Results indicated that student anger and the interaction between student gender and instructor gender are significant effects that account for a small amount of variance in SRI scores. All things considered, our criterion-referenced approach to SRIs is a viable way to describe teaching quality and help instructors refine pedagogy and facilitate course development.  相似文献   

Preschoolers explore interactive storybook apps: The effect on word recognition and story comprehension     

Marcy Zipke 《Education and Information Technologies》2017,22(4):1695-1712

Two experiments explored the effects of reading digital storybooks on tablet computers with 25 preschoolers, aged 4–5. In the first experiment, the students’ word recognition scores were found to increase significantly more when students explored a digital storybook and employed the read-aloud function than when they were read to from a comparable print book. Their comprehension scores did not change significantly in the two conditions. In Experiment 2, the same students explored digital storybooks with more animation embedded in them. The students listened to the read aloud function on the tablet computer and explored digital storybooks in both conditions, but in one condition a teacher guided the talk about the story. Contrary to expectations, the students’ word recognition and story comprehension scores were higher in the independent condition than in the guided condition. One explanation for the higher word recognition scores when students were reading with the tablet computer is the effect of multimedia, like hotspots and/or text tracking. Although digital storybooks are not a substitute for adult interaction, these preschoolers learned surprisingly well on their own. The importance of digital storybook design, as well as what elements to look for in an e-book to encourage literacy learning are discussed.  相似文献   

Albrecht Dürer at the crossroads of art and science     

Meyer J 《Endeavour》2004,28(1):2

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Nutrition for winter sports     

Meyer NL  Manore MM  Helle C 《Journal of sports sciences》2011,29(Z1):S127-S136

Winter sports are played in cold conditions on ice or snow and often at moderate to high altitude. The most important nutritional challenges for winter sport athletes exposed to environmental extremes include increased energy expenditure, accelerated muscle and liver glycogen utilization, exacerbated fluid loss, and increased iron turnover. Winter sports, however, vary greatly regarding their nutritional requirements due to variable physiological and physique characteristics, energy and substrate demands, and environmental training and competition conditions. What most winter sport athletes have in common is a relatively lean physique and high-intensity training periods, thus they require greater energy and nutrient intakes, along with adequate food and fluid before, during, and after training. Event fuelling is most challenging for cross-country skiers competing in long events, ski jumpers aiming to reduce their body weight, and those winter sport athletes incurring repeated qualification rounds and heats. These athletes need to ensure carbohydrate availability throughout competition. Finally, winter sport athletes may benefit from dietary and sport supplements; however, attention should be paid to safety and efficacy if supplementation is considered.  相似文献   

德语国家普通教学论的核心命题与时代课题     

希尔伯特·迈尔  任平  卡罗拉·尤汉娜斯 《教育研究》2022,43(1):100-114

德语国家(德国、奥地利以及瑞士)普通教学论历史悠久,对整个教育学科的建立与发展意义重大。普通教学论作为系统性、普遍性的教学理论,强调自身理论的主体性、师生对话的意义建构、教师清晰的指导与管理、教学的反思性实践。新的时代背景下,德语国家普通教学论的发展既坚守传统,又积极转向,系统分析其优劣特质可以发现:相关理论一方面具有整体性、独特性、指导性、反思性、规范性等特征;另一方面也面临着诸如学科地位下滑、缺乏实证研究支撑、自身理论发展缓慢、缺乏课程研究支持等问题。为应对信息技术时代学校教育的异质性、融合教育、移民教育、健康教育、数字化教育等新兴教学情境,相关研究呈现出新的发展趋势,转向"技术支持下团队合作"、"多主体协同建构"、"制定数字化教学新标准"。  相似文献