Kinematic differences of elite and high-performance tennis players in the cross court and down the line forehand     

Johannes Landlinger  Stefan Josef Lindinger  Thomas Stöggl  Herbert Wagner  Erich Müller 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(4):280-295

This study identified and compared the full body kinematics of different skill levels in the forehand groundstroke when balls were hit cross court and down the line. Forty-three three-dimensional retro-reflective marker trajectories of six elite and seven high-performance players were recorded using an eight-camera 400 Hz, Vicon motion analysis system. The six highest horizontal velocity forehands with reliable kinematics of all participants were analysed for each specific situation (a total of 156 analysed shots). Significant differences (p < 0.01) and large effect sizes were observed between elite and high-performance players in linear velocity of the shoulder (2.0 vs. 1.2 m/s), angular velocity of the pelvis (295 vs. 168 °/s), and angular velocity of the upper trunk (453 vs. 292 °/s) at impact. The elite group showed a tendency towards higher racquet velocities at impact (p < 0.05). No significant differences were found in angular displacement of the racquet, hip alignment, or shoulder alignment at the completion of the backswing; nor did angular displacement vary significantly at impact. Irrespective of the group, different shoulder, hip, and racquet angles were found at impact, depending on the situation. The results should assist coaches when striving to improve their players' forehand.  相似文献   

Teaching multiplication to low math performers: Guided versus structured instruction     

Kroesbergen  Evelyn H.  van Luit  Johannes E.H. 《Instructional Science》2002,30(5):361-378

The results of an intervention program forstudents with difficulties learning mathematicsare reported. Two kinds of math intervention,guided versus structured instruction, werecompared to regular math instruction. A totalof 75 students from regular and specialeducation, aged seven to thirteen,participated. Ability and automaticitymultiplication tests were administered beforeand after the four-month training period. Theresults show that the students in both of theexperimental conditions improved more than thestudents in the control condition. Someadditional differences were found between thetwo experimental interventions. Guidedinstruction appeared to be more effective forlow performing students than structuredinstruction and especially for those studentsin regular education. Special educationstudents appear to benefit most from structuredinstruction for the automaticity ofmultiplication problems. A three monthfollow-up test showed the acquired knowledge tobe well-established in both groups.  相似文献   

How did teachers make a living? The teacher occupation,livelihood diversification and the rise of mass schooling in nineteenth-century Sweden     

Johannes Westberg 《History of education》2019,48(1):19-40

Drawing inspiration from the new social history of livelihood, this article examines how rural nineteenth-century teachers made a living by engaging in livelihood diversification. By using a wide variety of source materials from nineteenth-century Sweden, this article shows that, far from specialising exclusively in teaching, teachers were often engaged in multiple occupations as late as the year 1900, and that teachers’ work ranged from activities that were encouraged to those that were frowned upon or even illegal. As a result, this article sheds new light on teaching as an occupation in the nineteenth century and contributes to the discussion of the social and economic positions of teachers. By investigating how teachers earned their livelihoods, this article also addresses the role of teachers’ multiple occupations in the expansion of mass schooling during the nineteenth century.  相似文献   

Measurement invariance and validity of a brief questionnaire on reading motivation in elementary students          下载免费PDF全文

Franziska Stutz  Ellen Schaffner  Ulrich Schiefele 《Journal of Research in Reading》2017,40(4):439-461

In order to initiate more research on the role of reading motivation during the initial stages of learning to comprehend texts, we developed the Reading Motivation Questionnaire for Elementary Students (RMQ‐E). The sample comprised 1497 elementary students in Grades 1–3. By means of exploratory and confirmatory factor analyses, three factors were determined: Curiosity, involvement and competition. The three‐factor structure of the RMQ‐E was found to be invariant across grade levels (scalar invariance) and across female and male students (strict invariance). As was anticipated, students in higher grades and male students were lower in curiosity and involvement than students in lower grades and female students. Whereas competitive reading motivation did not differ across grade levels, it was higher for boys than for girls. Moreover, the contributions of involvement and competition to reading amount and reading competence were in accordance with the hypotheses. The predictive validity of curiosity, however, was not confirmed.  相似文献   

Does parental homework involvement mediate the relationship between family background and educational outcomes?     

Hanna Dumont  Ulrich Trautwein  Oliver Lüdtke  Marko Neumann  Alois Niggli  Inge Schnyder 《Contemporary educational psychology》2012

This research examines whether parental homework involvement mediates the relationship between family background and educational outcomes such as academic achievement and academic self-concept. Data from two studies in which grade 8 students (N = 1274 and N = 1911) described their parents’ involvement in the homework process were reanalyzed via structural equation modeling. Perceived parental homework interference and perceived homework-related conflict were negatively related to students’ academic development, whereas perceived parental support and perceived parental competence to help with homework were positively related to academic outcomes. Although there were small associations between some aspects of parental homework involvement and family background variables, parental homework involvement did not mediate the relationship between family background and educational outcomes. Findings highlight the need for differentiated conceptualizations of parental homework involvement as well as detailed analyses of the processes underlying the association between family background and educational outcomes.  相似文献   

Arousing News Characteristics in Dutch Television News 1990–2004: An Exploration of Competitive Strategies     

Paul Hendriks Vettehen  Johannes Beentjes  Koos Nuijten  Allerd Peeters 《Mass Communication and Society》2013,16(1):93-112

This study investigates the processes by which competition in the television news market might promote the presence of arousing characteristics in television news. A total of 3,024 news stories from six Dutch television news programs over the period 1990 to 2004 were investigated through content analysis. The findings of the study show overall increases in all 6 arousing characteristics. The findings also show that commercial newcomers included more arousing characteristics in their news stories than the public service broadcasters, that commercial newcomers developed a news format that featured more arousing characteristics, and that existing programs reacted to newcomers by increasing the amount of arousing characteristics in their news stories.  相似文献   

Mathematical thinking intervention programmes for preschool children with normal and low number sense     

Pirjo Aunio  Jarkko Hautam?ki  Johannes E. H. Van Luit 《欧洲特需教育杂志》2013,28(2):131-146

This study investigated the possibility of enhancing the level of preschoolers’ number sense by introducing two intervention programmes, Let’s think! and Young children with special educational needs count, too! .Forty‐five preschoolers, mean age 66.4 months, were randomly assigned to the experimental and control groups. The experimental group received instruction twice a week, for half an hour, and for a period of nine months. Pretest–postest comparison revealed that the experimental group showed enhanced number‐sense performance immediately after the instruction ended, but the between‐group difference faded after six months. There were no statistically significant differences between the groups in general mathematical thinking abilities (transfer tasks) after the intervention.  相似文献   

CONSTRUCTIVISM AND EDUCATION: MISUNDERSTANDINGS AND PEDAGOGICAL IMPLICATIONS     

Emery J. Hyslop-Margison  Johannes Strobel 《The Teacher Educator》2013,48(1):72-86

Constructivism is a popular concept in contemporary teacher education programs. However, a genuine concern arises with the concept's application because many teachers and teacher educators claim that knowledge is constructed, without appreciating the epistemological and pedagogical implications such a claim entails. This article employs Phillips' (1995) Phillips, D. C. 1995. The good, the bad, and the ugly: The many faces of constructivism. Educational Researcher, 24(7): 5–12. [Crossref] , [Google Scholar] analytic framework that divides the pedagogical applications of constructivism into three distinct categories: the good, the bad, and the ugly. Reviewing the constructivist epistemologies of Dewey and Vygotsky also enables the exploration of how constructivism might inform both our understanding of the impediments students confront when learning new knowledge and our understanding of general constructivist pedagogical practices. The primary objective in this article is to provide teacher educators and teachers with a richer understanding of constructivism—its limitations and its strengths—while offering concrete pedagogical strategies for its classroom application.  相似文献   

Learning and Collective Knowledge Construction With Social Media: A Process-Oriented Perspective     

Joachim Kimmerle  Johannes Moskaliuk  Aileen Oeberst  Ulrike Cress 《教育心理学家》2013,48(2):120-137

Social media are increasingly being used for educational purposes. The first part of this article briefly reviews literature that reports on educational applications of social media tools. The second part discusses theories that may provide a basis for analyzing the processes that are relevant for individual learning and collective knowledge construction. We argue that a systems-theoretical constructivist approach is appropriate to examine the processes of educational social media use, namely, self-organization, the internalization of information, the externalization of knowledge, and the interplay of externalization and internalization providing the basis of a co-evolution of cognitive and social systems. In the third part we present research findings that illustrate and support this systems-theoretical framework. Concluding, we discuss the implications for educational design and for future research on learning and collective knowledge construction with social media.  相似文献   

Sex differences in secondary school success: why female students perform better   总被引：1，自引：0，他引：1  

Franziska Fischer  Johannes Schult  Benedikt Hell 《European Journal of Psychology of Education - EJPE》2013,28(2):529-543

School success is closely linked to intelligence but also to non-cognitive factors such as achievement motivation. The present study examines which non-cognitive factors predict secondary school grades and looks at reasons why female students tend to outperform their male counterparts. A sample of 554 German freshman students provided measures of general intelligence, achievement motivation, science course choice, self-efficacy, self-perceived academic achievement, and test anxiety. Results show that achievement motivation, self-perceived academic achievement, and sex significantly contribute to the final secondary school success above intelligence. Females’ advantage in final secondary school grades becomes even larger after controlling for general intelligence. This advantage can be explained by females’ higher achievement motivation. Showing more compensatory effort as well as self-control and taking more pride in their own productivity helps females to outperform their male counterparts at secondary school.  相似文献