Tin Oxide Chemistry from the Last Decade of the Nineteenth Century to the First Decade of the Twenty-First Century: Towards the Development of a Big-Picture Approach to the Teaching and Learning of Chemistry While Focussing on a Specific Compound or Class of Compounds     

Kevin C. de Berg 《Science & Education》2010,19(9):847-866

The discovery of the electron in 1897 deeply impacted the nature of chemistry in the twentieth century. A revolution in the theoretical structure of chemistry as well as in the instrumental tools used in chemical analysis occurred as a result of this discovery. The impact of this revolution on tin oxide chemistry over approximately a 100 year period is the focus of this paper. Important questions addressed include the following: Are tin oxides of importance in our current society or are they only of quaint academic interest? In what way has chemistry as a discipline added to our understanding of the tin oxides and has this added any technological value to these compounds? Does the historical approach followed in this paper offer chemistry educators the opportunity to place current chemical knowledge in a broader epistemological framework? The impact of the answers to these questions on chemistry education is discussed.  相似文献   

Gendering processes in the field of physical education     

Päivi Berg  Elina Lahelma 《Gender and education》2010,22(1):31-46

In Finnish secondary schools, girls and boys are taught physical education (PE) in separate groups. A male teacher normally teaches the boys and a female teacher teaches the girls. Focusing on PE teachers’ comments in two different ethnographic studies of seventh graders (13–14‐year‐olds), we examine the processes that reproduce or challenge the gender system and the possibilities of agency in the context of PE. Our findings suggest that the bodies of male students are regarded as strong and are, therefore, appreciated by both female and male teachers. Moreover, male teachers’ competence in PE is evaluated higher than that of the female teachers. None of the teachers questioned the male teachers’ ability to teach girls, however, heteronormativity arose as an issue. There were more doubts over female teachers’ competence to teach boys.  相似文献   

Accuracy and precision of loadsol® insole force-sensors for the quantification of ground reaction force-based biomechanical running parameters     

Wolfgang Seiberl  Elisabeth Jensen  Josephine Merker  Marco Leitel  Ansgar Schwirtz 《European Journal of Sport Science》2018,18(8):1100-1109

Force plates represent the “gold standard” in measuring running kinetics to predict performance or to identify the sources of running-related injuries. As these measurements are generally limited to laboratory analyses, wireless high-quality sensors for measuring in the field are needed. This work analysed the accuracy and precision of a new wireless insole forcesensor for quantifying running-related kinetic parameters. Vertical ground reaction force (GRF) was simultaneously measured with pit-mounted force plates (1?kHz) and loadsol^® sensors (100?Hz) under unshod forefoot and rearfoot running-step conditions. GRF data collections were repeated four times, each separated by 30 min treadmill running, to test influence of extended use. A repeated-measures ANOVA was used to identify differences between measurement devices. Additionally, mean bias and Bland–Altman limits of agreement (LoA) were calculated. We found a significant difference (p?® devices for these parameters. For these same parameters, the LoA analysis showed that 95% of all measurement differences between insole and force plate measurements were less than 12%, demonstrating high precision of the sensors. However, highly dynamic behaviour of GRF, such as force rate, is not yet sufficiently resolved by the insole devices, which is likely explained by the low sampling rate.  相似文献   

The electrocardiographic manifestations of athlete’s heart and their association with exercise exposure     

Bram Bessem  Matthijs C. De Bruijn  Wybe Nieuwland  Johannes Zwerver  Maarten Van Den Berg 《European Journal of Sport Science》2018,18(4):587-593

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Innovative approaches to continuous professional development in early childhood education and care. A European perspective     

Brecht Peleman  Bente Jensen  Jan Peeters 《European Journal of Education》2018,53(1):3-8

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Undignified Dignity: Using Humor to Manage the Stigma of Mental Illness and Homelessness     

Peter R. Jensen 《Communication quarterly》2018,66(1):20-37

Research on stigma has generally focused on either how stigmatized individuals manage their stigmatizing traits, how stigmatizing messages are communicated, or on how education and contact campaigns reduce the degree of stigma. This article seeks to expand on the communication stigma literature by arguing that stigmatized and unstigmatized individuals are able to co-manage stigmatizing traits through the cocreation of a culture of individualized dignity. Specifically, this ethnographic study examines the use of humor at a homeless shelter that caters to individuals with severe mental illness to create a culture of “undignified dignity.” The findings highlight how even complex stigmas may be ameliorated through a focus on dignity as a bridging medium between stigmatized and unstigmatized individuals.  相似文献   

Interdisciplinary collaboration as a prerequisite for inclusive education     

Lotte Hedegaard-Soerensen  Charlotte Riis Jensen  Ditte Maria Børglum Tofteng 《欧洲特需教育杂志》2018,33(3):382-395

This article reports on findings from a research project on interdisciplinary collaboration between mainstream school teachers and special school teachers. The aim of the research project has been to examine the knowledge of special school teachers and how this knowledge can contribute to the development of an inclusive learning environment in mainstream schools. Not as a simple task of transferring knowledge, but as a process of transforming knowledge through interdisciplinary collaboration and co-teaching. The design of the study is inspired by the notion of participation within action research as a research approach. Thus the thick data generated from reflective activities in the study design are analysed within a narrative and practice directed strategy of analysis.  相似文献   

Anabolic–androgenic steroid use and correlates in Norwegian adolescents     

Morten Renslo Sandvik  Anders Bakken  Sigmund Loland 《European Journal of Sport Science》2018,18(6):903-910

This paper surveys the prevalence and correlates of anabolic androgenic steroids (AAS) use among Norwegian adolescents, and examines the degree to which sports participation is a mediating or moderating factor to well-known correlations between AAS use and problem behaviour. The data come from the “Ungdata” study, a cross-national youth survey system offered to all municipalities in Norway (response rate: 74%, N?=?77,572). The study demonstrates a lifetime prevalence of AAS use of 1.27% and a higher prevalence among boys (1.81%) than girls (0.76%). The analyses show that AAS use is clearly related to problem behaviour such as violence and other substance use. When controlling for problem behaviour, there are no correlations between AAS use and exercising in a sports club or on one’s own, whilst there is a weak positive correlation between AAS use and exercising in a gym or engaging in other forms of physical exercise such as dancing or martial arts. These patterns are more or less the same for boys and for girls. We conclude that adolescent AAS use is a low-prevalence phenomenon that primarily takes place in smaller subgroups of individuals who engage in other forms of problem behaviour as well.  相似文献   

The compatibility of zero-sum logic and mutualism in sport     

Adam Berg 《体育哲学杂志》2018,45(3):259-278

This essay argues that within competitive sport zero-sum logic and the theory of mutualism are compatible and complementary. Drawing on Robert Simon’s theory of mutualism and Scott Kretchmar’s argument for zero-sum logic, this article shows how athletes can strive for a clear-cut victory and shared benefits such as athletic excellence fully and wholeheartedly at the same time. This paper will also consider how acknowledgment of this dynamic could advance understandings for ethical theories for sport. It will then conclude by describing a subjective approach that will make the affinity of zero-sum logic and mutualism more accessible for sports people.  相似文献   

Investigating Strategies for Pre-Class Content Learning in a Flipped Classroom     

Jamie L. Jensen  Emily A. Holt  Jacob B. Sowards  T. Heath Ogden  Richard E. West 《Journal of Science Education and Technology》2018,27(6):523-535

In a flipped classroom model, learning of basic content is shifted before class while in-class time is used for concept application. Empirical and controlled research studies are lacking on the best strategies to provide the necessary pre-class content instruction. In this study, we tested three methods of pre-class content learning—interactive online tutorials, video lectures, and textbook-style readings—while holding the content and the in-class application activities constant. Identical introductory, non-majors biology classes were manipulated at both a public, open-enrollment institution and a private, highly selective institution. We found that video lectures offer a small advantage to overall student learning over interactive tutorials or textbook-style readings. Although our two populations differed in their ability to effectively learn from pre-class activities, through a student-centered flipped classroom approach, students at both institutions demonstrated equal learning gains by the final assessment. Potential reasons for some observed differences are suggested.  相似文献