Micromixer based on viscoelastic flow instability at low Reynolds number

We exploited the viscoelasticity of biocompatible dilute polymeric solutions, namely, dilute poly(ethylene oxide) solutions, to significantly enhance mixing in microfluidic devices at a very small Reynolds number, i.e., Re≈0.023, but large Peclet and elasticity numbers. With an abrupt contraction microgeometry (8:1 contraction ratio), two different dilute poly(ethylene oxide) solutions were successfully mixed with a short flow length at a relatively fast mixing time of <10 μs. Microparticle image velocimetry was employed in our investigations to characterize the flow fields. The increase in velocity fluctuation with an increase in flow rate and Deborah number indicates the increase in viscoelastic flow instability. Mixing efficiency was characterized by fluorescent concentration measurements. Our results showed that enhanced mixing can be achieved through viscoelastic flow instability under situations where molecular-diffusion and inertia effects are negligible. This approach bypasses the laminar flow limitation, usually associated with a low Reynolds number, which is not conducive to mixing.     

School support and teacher motivation to implement project-based learning

The present study investigated how school support was related to teachers' motivation and willingness to persist in project-based learning. The participants were 182 Hong Kong teachers who completed a questionnaire about their school's support and their motivation to implement project-based learning. The results of structural equation modeling indicated that when teachers perceived their schools as being stronger in collegiality and more supportive of teacher competence and autonomy, they had higher motivation in project-based learning and stronger willingness to persist in this educational innovation. Perceived school support predicted teachers' attitude for future persistence both directly and indirectly through its influence on teacher motivation. The results suggest that social-contextual factors are important for teacher motivation in the implementation of educational innovations.     

Behavioural Interactions within Chinese Families with Children Exhibiting Emotional Difficulties in Adlerian Family Play Therapy: Implications for Counselling Professionals

This study explores behavioural interactions between Chinese parents and emotionally disturbed children in Taiwan by conducting behavioural interaction analysis of five sessions each of Adlerian family play therapy involving two families. Emerging themes included behavioural displays of discouragement, control, aggression, intimacy, and conflicts. Implications are drawn and recommendations made on how counselling professionals may use behavioural interaction assessment through family play therapy as an intervention tool.     

R.S. PETERS AND THE CONCEPT OF EDUCATION

In this essay Kelvin Beckett argues that Richard Peters's major work on education, Ethics and Education, belongs on a short list of important texts we can all share. He argues this not because of the place it has in the history of philosophy of education, as important as that is, but because of the contribution it can still make to the future of the discipline. The limitations of Peters's analysis of the concept of education in his chapter on “Criteria of Education” are well known. In the chapter on “Education as Initiation,” however, Peters offered a synthetic sketch of education that, Beckett argues, points us toward a more comprehensive definition of education, one which, he maintains, can be accepted by all philosophers, regardless of the tradition they work in.     

Sharing best practices in Barbados and Trinidad and Tobago: patterns of policy implementation and resistance

This article outlines policies from multilateral organisations that advocate sharing best practices between developing nations. The article discusses the degree to which these best practices are implemented by small states as indicated by teachers, academics and policymakers in Barbados and Trinidad and Tobago. For the purpose of this article, a best practice refers to pedagogy, curriculum or programme that contributes to student achievement. Currently, a number of influential multilateral organisations advocate that developing nations should share their best practices in education with each other. Despite encouragement by multilaterals however, best practices are not shared. At best, foreign ideas are used to legitimise local policies. While these policies are intended to help countries reach their Education for All (EFA) goals, they do not account for the differences between islands and their vulnerability towards larger countries. Attempts to innovate the curriculum by implementing foreign ideas failed due to the forces of tradition. It can thus be concluded that resistance – non‐compliance or opposition – to sharing educational best practices, as well as to the implementation of new curricula, stems from echoes of colonialism and globalisation. Although this study focuses on two islands, there are implications for other developing countries and small states as they fall under the same policy auspices of UNESCO and the Commonwealth Secretariat.     

Effects of forefoot bending stiffness of badminton shoes on agility,comfort perception and lower leg kinematics during typical badminton movements

This study investigated whether an increase in the forefoot bending stiffness of a badminton shoe would positively affect agility, comfort and biomechanical variables during badminton-specific movements. Three shoe conditions with identical shoe upper and sole designs with different bending stiffness (Flexible, Regular and Stiff) were used. Elite male badminton players completed an agility test on a standard badminton court involving consecutive lunges in six directions, a comfort test performed by a pair of participants conducting a game-like practice trial and a biomechanics test involving a random assignment of consecutive right forward lunges. No significant differences were found in agility time and biomechanical variables among the three shoes. The players wearing the shoe with a flexible forefoot outsole demonstrated a decreased perception of comfort in the forefoot cushion compared to regular and stiffer conditions during the comfort test (p < 0.05). The results suggested that the modification of forefoot bending stiffness would influence individual perception of comfort but would not influence performance and lower extremity kinematics during the tested badminton-specific tasks. It was concluded that an optimisation of forefoot structure and materials in badminton shoes should consider the individual’s perception to maximise footwear comfort in performance.     

Secondary School Art Teachers' Concepts of Teaching in Hong Kong

Recently, there has been considerable concern among art educators and cultural policy makers to promote art education in Hong Kong. The launch of the new curriculum of a discipline-based character in 1996 generated debate in the art education circle of Hong Kong. There were diverse opinions on the rationale for teaching art. Concern was expressed about the present constraints of art teaching related to teachers' ability and school administration poses another important issue that seems to inhibit further developments. This paper reports part of the findings of a study on art teachers' concepts of teaching. It explores the concepts of about 20 secondary art teachers in Hong Kong. Several categories of teaching are derived from interviews: aesthetic development, moral development, intellectual development, expression and therapy, and intellectual and aesthetic development. A scheme is developed which can be used to analyze teachers' concepts as education in or through art on a continuum from subject to learner centred.