School mental health: recent advances and future directions     

Panos Vostanis 《Emotional and Behavioural Difficulties》2013,18(3):238-240

  相似文献   

Landing ground reaction forces in figure skaters and non-skaters     

Nathan W. Saunders  Nicholas Hanson  Panos Koutakis  Ajit M. Chaudhari 《Journal of sports sciences》2013,31(11):1042-1049

Abstract

Researchers and clinicians have suggested that overuse injuries to the lower back and lower extremities of figure skaters may be associated with the repeated high impact forces sustained during jump landings. Our primary aim was to compare the vertical ground reaction forces (GRFs) in freestyle figure skaters (n = 26) and non-skaters (n = 18) for the same barefoot single leg landing on a force plate from a 20 cm platform. Compared with non-skaters, skaters exhibited a significantly greater normalised peak GRF (3.50 ± 0.47 × body weight for skaters vs. 3.13 ± 0.45 × body weight for non-skaters), significantly shorter time to peak GRF (81.21 ± 14.01 ms for skaters vs. 93.81 ± 16.49 ms for non-skaters), and significantly longer time to stabilisation (TTS) of the GRF (2.38 ± 0.07 s for skaters vs. 2.22 ± 0.07 s for non-skaters). Skaters also confined their centre of pressure (CoP) to a significantly smaller mediolateral (M–L) (25%) and anterior–posterior (A–P) (40%) range during the landing phase, with the position of the CoP located in the mid to forefoot region. The narrower and more forward position of the CoP in skaters may at least partially explain the greater peak GRF, shorter time to peak, and longer TTS. Training and/or equipment modification serve as potential targets to decrease peak GRF by distributing it over a longer time period. More comprehensive studies including electromyography and motion capture are needed to fully characterise the unique figure skater landing strategy.  相似文献   

Reconceptualising moderation in asynchronous online discussions using grounded theory     

Panos Vlachopoulos  John Cowan 《Distance Education》2010,31(1):23-36

This article reports a grounded theory study of the moderation of asynchronous online discussions, to explore the processes by which tutors in higher education decide when and how to moderate. It aims to construct a theory of e‐moderation based on some key factors which appear to influence e‐moderation. It discusses previous research on the definition and practice of e‐moderation, and then describes the study, which involved four e‐moderators working in two different university contexts. Key themes on e‐moderation, which emerged using a grounded theory approach, are discussed. It proposes a framework for e‐moderation and suggests that as a facilitative activity, it should be sufficiently contained within a ring‐fenced learning arena. Factors outside and inside the ring‐fence that appear to influence e‐moderation and their implications for future theory development and validation are discussed.  相似文献   

On the distributional impact of public education: evidence from Greece     

Panos Tsakloglou  Manos Antoninis 《Economics of Education Review》1999,18(4):101

Household budget survey data and public budget consolidated data for 1987/88 are combined to yield a non-estimation based measure of the benefit of public education outlays in Greece. As expected for a country where education services are provided free of charge and the role of private education is limited, transfers in the fields of primary and secondary education contribute strongly to a decline in inequality. The distributional impact of tertiary education subsidies is shown to be negligible, although indirect evidence suggests that this could well be regressive. [JEL I21, D31]  相似文献