Finite element modelling and experimental study of oblique soccer ball bounce

In this study, we develop a finite element model to examine the oblique soccer ball bounce. A careful simulation of the interaction between the ball membrane and air pressure in the ball makes the model more realistic than analytical models, and helps us to conduct an accurate study on the effect of different parameters on a bouncing ball. This finite element model includes a surface-based fluid cavity to model the mechanical response between the ball carcass and the internal air of the ball. An experimental set-up was devised to study the bounce of the ball in game-relevant impact conditions. Ball speed, angle, and spin were measured before and after the bounce, as well as ball deformation and the forces during the impact. The finite element model has been validated with three different sets of data, and the results demonstrate that the finite element model reported here is a valuable tool for the study of ball bounce. After validation of the model, the effect of the friction coefficient on soccer ball bounce was studied numerically. Simulation results show that increasing the friction coefficient may result in reversal of the horizontal impact force.     

Correction to: The State of Current Reading Intervention Research for English Learners in Grades K–2: a Best-Evidence Synthesis

Educational Psychology Review -     

The State of Current Reading Intervention Research for English Learners in Grades K–2: a Best-Evidence Synthesis

Educational Psychology Review - This best-evidence synthesis reviews the past 20 years of rigorous reading intervention research to identify effective programs of instruction for Grade K–3...     

Expelled from Childcare: Suspension and Expulsion Practices in One State’s Community Childcare Centers

Early Childhood Education Journal - Suspension and expulsion, typically thought of as discipline practices for high school students, occur at the early childhood level. In fact, 3- and 4-year old...     

Does evaluating peer assessment accuracy and taking it into account in calculating assessor’s final score enhance online peer assessment quality?

Education and Information Technologies - Peer assessment has an important role in teaching and learning nowadays. However, the existing techniques tend to be limited due to a lack of a suitable...     

The mathematics teacher identity of two early career mathematics teachers and the influence of their working communities on its development

Journal of Mathematics Teacher Education - To better understand the critical early years of teaching and teacher identity development, this study explored the mathematics teacher identity of two...     

Engaging Students with Integrated STEM Education: a Happy Marriage or a Failed Engagement?

International Journal of Science and Mathematics Education - The “leaky pipeline” with regard to students’ engagement in Science, Technology, Engineering, and Mathematics (STEM)...     

Taking stock of the UN Decade of education for sustainable development: the policy-making process in Flanders

In this paper, we address the implementation of the UN Decade of Education for Sustainable Development (ESD) in Flanders, a sub-national entity of Belgium. Our analysis shows how the policy-making process in Flanders is inextricably intertwined with three developments in environmental and educational policy: the increasing impact of ESD policy and discourse on environmental education, the framing of social and political problems as learning problems, and ecological modernisation. These trends give shape to a post-ecologist and post-political policy regime and, thus, affect what is possible and acceptable within Flemish ESD policy. However, this case study also revealed that these developments do not completely determine ESD policy-making in Flanders. Our examination thus allowed us to understand how the actual policy translation in a particular local setting brings about powers that legitimise and maintain as well as counteract the bounds of the policy regime that emerged in the context of the UN Decade.