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   

The effects of knowledge management on innovative success – An empirical analysis of German firms     

Uwe Cantner  Kristin Joel  Tobias Schmidt 《Research Policy》2011,40(10):1453-1462

The aim of this paper is to analyse the effects of knowledge management on the innovation success of firms in Germany. We look at innovative firms in the period from 2000 to 2002 taken from the Mannheim Innovation Panel and estimate the effect of collaborative measures of knowledge management on the immediate economic success of different types of innovations. The results of our matching analysis reveal that firms which apply knowledge management perform better in terms of higher-than-average shares of turnover with innovative products compared to their twins. We do not find a significant effect of knowledge management on the share of cost reductions with process innovation.  相似文献   

Early German Darwinism reconsidered     

Georgy?S.?LevitEmail author  Uwe?Hossfeld 《Metascience》2011,20(1):113-115

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School mathematics registers in a context of low academic expectations     

Hauke Straehler-Pohl  Saínza Fernández  Uwe Gellert  Lourdes Figueiras 《Educational Studies in Mathematics》2014,85(2):175-199

We investigate the different school mathematical discourses that are made available for students who all share an unfavourable social and economical position and experiences of low achievement in primary school, and who have been streamed into three different ability groups at the very beginning of secondary school. Our investigation is built on the premise that schools distribute different forms of knowledge to different social groups and thus provide different opportunities to develop consciousness. We look at teacher–student interactions as expressions of social structure at the micro-level and as constituents of social structure on the macrolevel. Employing analytic tools from social semiotics, we carried out a register analysis of the school mathematical discourse in each stream. We found systematic differences and linked them to the work of Dowling (1998) on the construction of ability and its implications for social hierarchies. As a result, the upper of the three streams was freed from a discourse of low expectations, while such a discourse was reinforced for the lower stream. Finally, we will discuss our findings in relation to the contemporary debate about the role of mathematics education in social stratification.  相似文献   

Familie und Familienalltag als Bildungsherausforderung     

Dr. Matthias Euteneuer  Prof. Dr. Uwe Uhlendorff 《Zeitschrift für Erziehungswissenschaft》2014,17(4):723-742

Against the background of a growing diversity and fluidity of family life in modern western societies, the arrangement of everyday family life has become quite demanding for individuals and families. The reflection of individual notions of family as well as the development of concepts of a fulfilling everyday family life has become a recurrent challenge throughout the life course, particularly relevant during transitions in family life (e. g. the transition to parenthood, the reentry of the main caregiver into the labor market, or the transition into post couple parenthood after separation or divorce). Although family theory recently developed the concept of ‘doing family’ to highlight the need to maintain and arrange family life day after day, there is little knowledge on how individuals develop family concepts and how these concepts are adopted to changing life circumstances. In this article we present a research approach which allows to empirically study the reflection and development of family concepts and to work out family concept-related processes of learning and ‘Bildung’. We will illustrate our theoretical and methodological considerations by presenting results from a case study that is part of an ongoing longitudinal study.  相似文献   

The emergent curriculum: navigating a complex course between unguided learning and planned enculturation   总被引：2，自引：2，他引：0  

Uwe Gellert 《课程研究杂志》2013,45(3):313-328

Although systemic reform seems to be a broadly accepted framework for educational change, concrete reform projects still face the uncertainty of how to meet the necessary requirements. This paper considers the case of a curriculum reform process in primary mathematics education that has a focus on the involvement and influence of parents. The data consists of a short address to the parents of first‐graders printed in the teacher’s version of a textbook. In this address, the parents are introduced to the new concept of active‐explorative learning and allocated a specific role within the process of change. By means of discourse analysis and the sociological ideas of exclusion/inclusion, autonomy, and expert/non‐technical discourse, the long‐term consequences of the social role assigned to parents in the programme is discussed.  相似文献   

3. Lammers, Astrid: Bildung und Konzentration. Problemgeschichtliche, prinzipienwissenschaftliche und schulp?dagogische Untersuchungen
Hildesheim, Zürich, New York: Georg Olms Verlag 1998. 184 S. Preis: 34,80 DM     

Uwe Hericks  Ingrid Kunze 《Zeitschrift für Erziehungswissenschaft》2001,4(3):478

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Longitudinal relationships between perceived stress,exercise self-regulation and exercise involvement among physically active adolescents     

Markus Gerber  Magnus Lindwall  Serge Brand  Christin Lang  Catherine Elliot  Uwe Pühse 《Journal of sports sciences》2015,33(4):369-380

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Book review     

Uwe Jens Nagel 《The Journal of Agricultural Education and Extension》2013,19(4):262-266

Land‐Grant Universities and Extension into the 21st Century: Renegotiating or Abandoning a Social Contract By: George R. McDowell. Iowa State University Press, Ames, 2001. 264 pp, $ 59.95  相似文献   

Prediction of the P-leaching potential of arable soils in areas with high livestock densities     

Werner W  Trimborn M  Pihl U 《Journal of Zhejiang University. Science. B》2006,7(7):515-520

Due to long-term positive P-balances many surface soils in areas with high livestock density in Germany are oversupplied with available P, creating a potential for vertical P losses by leaching. In extensive studies to characterize the endangering of ground water to P pollution by chemical soil parameters it is shown that the available P content and the P concentration of the soil solution in the deeper soil layers, as indicators of the P-leaching potential, cannot be satisfactorily predicted from the available P content of the topsoils. The P equilibrium concentration in the soil solution directly above ground water table or the pipe drainage system highly depends on the relative saturation of the P-sorption capacity in this layer. A saturation index of 〈20% normally corresponds with P equilibrium concentrations of〈0.2 mg P/L. Phytoremediation may reduce the P leaching potential of P-enriched soils only over a very long period.  相似文献