Performance differences when using 26- and 29-inch-wheel bikes in Swiss National Team cross-country mountain bikers

The purpose of this study was to analyse the effect of bike type – the 26-inch-wheel bike (26“ bike) and the 29-inch-wheel bike (29“ bike) – on performance in elite mountain bikers. Ten Swiss National Team athletes (seven males, three females) completed six trials with individual start on a simulated cross-country course with 35 min of active recovery between trials (three trials on a 26“ bike and three trials on a 29“ bike, alternate order, randomised start-bike). The course consisted of two separate sections expected to favour either the 29“ bike (section A) or the 26“ bike (section B). For each trial performance, power output, cadence and heart rate were recorded and athletes’ experiences were documented. Mean overall performance (time: 304 ± 27 s vs. 311 ± 29 s; P < 0.01) and performance in sections A (P < 0.001) and B (P < 0.05) were better when using the 29“ bike. No significant differences were observed for power output, cadence or heart rate. Athletes rated the 29“ bike as better for performance in general, passing obstacles and traction. The 29“ bike supports superior performance for elite mountain bikers, even on sections supposed to favour the 26“ bike.     

Designing informal learning experiences for early career academics using a knowledge ecosystem model

This article presents a ‘knowledge ecosystem’ model of how early career academics experience using information to learn while building their social networks for developmental purposes. Developed using grounded theory methodology, the model offers a way of conceptualising how to empower early career academics through (1) agency (individual and relational) and (2) facilitation of personalised informal learning (design of physical and virtual systems and environments) in spaces where developmental relationships are formed, including programmes, courses, events, community, home and social media. It is suggested that the knowledge ecosystem model is suitable for use in designing informal learning experiences for early career academics.     

Cognitive Development in Gifted Children: Toward a More Precise Understanding of Emerging Differences in Intelligence

To truly understand gifted performance, it is necessary to merge research on giftedness with current thinking in cognitive development and intelligence. This article presents traditional research on gifted children's cognitive development then considers how the application of newer models and theories from the field of cognitive development can be combined with research on giftedness to change the way people think about gifted performance. First four factors that have often been associated with giftedness are discussed from the perspectives of cognitive developmental psychology and gifted education. Next, emphasis is placed on investigating the strategic development of gifted children. Specifically, R. S. Siegler's (Emerging Minds: The Process of Change in Children's Thinking, Oxford University Press, New York, 1996) model of strategy development is addressed in terms of what it may contribute to understanding gifted cognition. Finally, future lines of research using models from cognitive development and complex systems models of development are recommended.     

Public journalism公共新闻——A reply to critics对批评的回应

公共新闻运动在新闻学者和新闻从业者中是个颇具争议性的话题.它始于上世纪90年代早期,是对政府和公民、新闻机构和受众间日益扩大的分歧的回应.也就是政治选举中选民参与的下降,更普遍的说,是公民参与本地社区事务的衰退,这被视做公民普遍退出民主进程的例证.     

‘Go over there and look at the pictures in the book’: an investigation of educational marginalisation,social interactions and achievement motivation in an alternative middle school setting

The middle years of school represent a time of educational turbulence, serving to marginalise some students from educational opportunities. Much research has focussed on individual cognitive factors influencing educational engagement, with less attention directed towards social interactions. Theoretically positioned within an expectancy–value model of achievement motivation, this study draws on the lived experience of a 12-year-old student within an alternative school in South Australia, Australia, to explore how social encounters may contribute to educational marginalisation. Findings from a narrative case study employing a semi-structured interview suggested that connections exist between social influences, such as interactions with teachers and peers, and subsequent achievement motivation. This study suggests that social interactions are critical determinants to an individual's educational engagement, affecting educational ability, expectancy and value beliefs.