Lines of Freedom     

Gerhard Friedrich 《The Educational forum》2013,77(4)

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Portrait of Peter     

Gerhard Friedrich 《The Educational forum》2013,77(2)

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Student‐Teachers' Ability to Read Nature: Reflections on their own learning in ecology     

Ola Magntorn  Gustav Helldén 《International Journal of Science Education》2013,35(10):1229-1254

This paper addresses student‐teachers' ability to read nature in a woodland habitat before and after a 10‐week ecology course. Reading nature is our definition of the ability to observe, describe and explain basic ecology in the field. Data consists of field‐based pre‐course and post‐course interviews followed up by metacognitive interviews where students analyse their own learning. A bi‐dimensional coding scheme is adopted to examine the range and development of students' ability to read nature. Students find it important to know the ecology of a few key species and they recognize the importance of having learned the language of ecology — ecologish — helping them to describe and discuss ecology. Students generally recognize the excursions as key learning situations in ecology education but they give different reasons for finding excursions so important. This variation will be elaborated in the paper together with the implications for teaching ecology.  相似文献   

Factors affecting teachers’ student-centered classroom computer use     

Helmut Felix Friedrich  Aemilian Hron 《Educational Media International》2013,50(4):273-285

The present study aims at investigating which factors are relevant to induce teachers’ student-centered classroom computer use. Survey data were collected from 361 teachers at comprehensive schools. Based on a systemic view of technology use in schools, different individual teacher characteristics and school contextual factors were examined. Results from a four-step hierarchical regression reveal that student-centered classroom computer use could be significantly predicted by certain contextual factors: the type of school (secondary modern and high school), the existence of an ICT school policy plan, as well as by the individual teacher characteristics of belief in constructivist pedagogy and their frequency of classroom computer use. The final regression model accounted for approximately 31% of the variance in the outcome measure for these factors.  相似文献   

Differences in impact characteristics,joint kinetics and measurement reliability between forehand and backhand forward badminton lunges     

Morten Hauge Nielsen  Jan Noergaard Lund  Uwe Gustav Kersting 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(4):547-560

ABSTRACT

This study identified the effect of badminton lunging directions on impact characteristics, joint kinetics and measurement reliability. A total of 14 badminton players performed 20 lunges in both forehand and backhand sides. Ground reaction force (GRF) and three-dimensional joint moment variables were determined for further analyses. Paired t-tests and Wilcoxon signed-rank tests were performed to determine any differences between the two lunge directions and intra-class correlation (ICC) and sequential averaging analysis (SAA) were used to estimate the minimum number of trials. Compared to the forehand side, participants experienced significantly larger total GRF impulse (+ 3.8%, p = 0.021) and transverse moment (hip + 63.5%, p < 0.001; knee + 80.7%, p = 0.011), but smaller hip (?7.7%), knee (?18.7%) and ankle frontal moments (?58.0%, p < 0.05) in backhand lunges. The minimum number of trials was similar for both lunge directions, as the averaged absolute differences was less than one in both ICC and SAA. Furthermore, smaller minimal number of trials was determined by the ICC (7.9–8.0), compared with the SAA approach (9.5–10.3). Lunge direction would influence GRF and joint loading, but not on the measurement reliability. These results give important insights to establish performance or equipment evaluation protocols during badminton lunges.  相似文献   

A novel miniature dynamic microfluidic cell culture platform using electro-osmosis diode pumping     

Jen-Yung Chang  Shuo Wang  Jeffrey S. Allen  Seong Hyuk Lee  Suk Tai Chang  Young-Ki Choi  Craig Friedrich  Chang Kyoung Choi 《Biomicrofluidics》2014,8(4)

An electro-osmosis (EOS) diode pumping platform capable of culturing cells in fluidic cellular micro-environments particularly at low volume flow rates has been developed. Diode pumps have been shown to be a viable alternative to mechanically driven pumps. Typically electrokinetic micro-pumps were limited to low-concentration solutions (≤10 mM). In our approach, surface mount diodes were embedded along the sidewalls of a microchannel to rectify externally applied alternating current into pulsed direct current power across the diodes in order to generate EOS flows. This approach has for the first time generated flows at ultra-low flow rates (from 2.0 nl/s to 12.3 nl/s) in aqueous solutions with concentrations greater than 100 mM. The range of flow was generated by changing the electric field strength applied to the diodes from 0.5 Vpp/cm to 10 Vpp/cm. Embedding an additional diode on the upper surface of the enclosed microchannel increased flow rates further. We characterized the diode pump-driven fluidics in terms of intensities and frequencies of electric inputs, pH values of solutions, and solution types. As part of this study, we found that the growth of A549 human lung cancer cells was positively affected in the microfluidic diode pumping system. Though the chemical reaction compromised the fluidic control overtime, the system could be maintained fully functional over a long time if the solution was changed every hour. In conclusion, the advantage of miniature size and ability to accurately control fluids at ultra-low volume flow rates can make this diode pumping system attractive to lab-on-a-chip applications and biomedical engineering in vitro studies.  相似文献   

Welche Rolle spielt neben Merkmalen des Instruktionsdesigns die fachspezifische und aufgabenspezifische Motivation beim Lernen mit Multimedia im naturwissenschaftlichen Unterricht?     

Prof. Dr. Katharina Scheiter  Dr. Anne Schüler  Prof. Dr. Peter Gerjets  Kim Stalbovs  Carina Schubert  Dr. Thomas Huk  Prof. Dr. Dr. Friedrich W. Hesse 《Zeitschrift für Erziehungswissenschaft》2014,17(2):279-296

The present paper reports on an empirical study which investigated learning with text and animations in the science classroom. In a 2?×?2 design the presence of multimedia learning material instruction (text only vs. text + animations) as well as the modality of the explanatory text (spoken vs. written) were tested. Prior to learning, students’ motivation to learn was assessed as a continuous factor. Recall and transfer were assessed immediately after learning. The results show better recall of information for learners with multimedia materials, providing the animations were accompanied by spoken text. However, in contrast to the positive effects of domain-specific motivation this multimedia effect was not evident for transfer. The effects of multimedia design were independent of motivation. Implications for future studies are discussed.  相似文献   

Personal Social Networks and the Cultivation of Expertise in Magic: An Interview Study     

Olli Rissanen  Tuire Palonen  Petteri Pitkänen  Gustav Kuhn  Kai Hakkarainen 《Vocations and Learning》2013,6(3):347-365

The purpose of the present study was to examine expertise in magic by interviewing 16 prominent Finnish magicians who were identified earlier through a social network analysis of 120 Finnish magicians. A semi-structured interview was administered that addressed the participants’ histories; their relationship to magic, the nature of their expertise, the networked development of expertise, their engagement with magical expertise and their motivation for cultivating such expertise. The results indicated that expertise in magic is cultivated, to a great extent, by informal networks of expertise without formal training. The participants had become excited about magic as children and started to pursue an expertise in the field from a relatively early age (4 to 14 years). In accordance with other domains of expertise, it had taken about 10 years of cultivating skills and competencies before becoming professional in the field, with a few exceptions. Ego-centric network analyses revealed that there were three or four magicians who had significantly shaped the Finnish field of magic and affected most of the participants’ development and career. Most of the participants were clustered, forming a core of Finnish magicians, and those magicians working abroad and collaborating with international magicians were located at the periphery of the Finnish network or formed an isolated network of clusters within it.  相似文献   

Objective vs. Essay Tests     

Alice Gustav 《College Teaching》2013,61(1)

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Spiel- und Bewegungskarrieren sehgeschädigter Kinder und Jugendlicher     

Jürgen Schwier  G. Friedrich 《Sportwissenschaft》1996,26(3):331-335

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