Diagnosis for Covariance Structure Models by Analyzing the Path

When a covariance structure model is misspecified, parameter estimates will be affected. It is important to know which estimates are systematically affected and which are not. The approach of analyzing the path is both intuitive and informative for such a purpose. Different from path analysis, analyzing the path uses path tracing and elementary numerical analysis to identify affected parameters when a 1-way or 2-way arrow in a path diagram is omitted. It not only characterizes how a misspecification affects model parameters but also facilitates a good understanding of the relation among different parts of the model. This article introduces and studies this technique and, for commonly used models, provides detailed analysis to identify the directions of change for various model parameters. Examples based on real data show that the technique of analyzing the path can reliably predict the direction of change in parameter estimates even when the true model is unknown. Conditions that interfere with the results are also discussed and advice is provided for its proper application.     

Technology and technological knowledge: a challenge for school curricula

In contrast to subjects such as mathematics and the sciences, it has been argued that technology education lacks a clear definition and a clearly defined knowledge base. This discursive article seeks to inform the debate by highlighting the matter of subject definition and in addition to examine the key issue of the knowledge which underpins technology education. The nature of the knowledge involved in technology education is explored by focusing on the types of knowledge (declarative/conceptual, procedural and conditional/strategic) that are required to secure full engagement with this subject. Drawing on extant literature on knowledge, the article takes technology as its focus and highlights the challenges this presents for teachers. A conceptual framework based on the presented evidence is included to show the relationships between knowledge and the skills, the problem‐solving and the values that are integral to technology education. This article concludes that to be effective, technology teaching must be based upon an appropriate subject definition indicating what it is endeavouring to achieve. In addition the existence of such a specialist subject knowledge base must be fully acknowledged, and at the same time there must be full recognition of the need to draw upon relevant knowledge from other subject areas in an appropriate manner in order to inform classroom teaching of the subject.     

Middle attainers and 14–19 progression in England: half‐served by New Labour and now overlooked by the Coalition?

In the context of the international problem of ‘early school leaving’, this paper explores the issue of sustained participation in upper secondary education in England. It focuses in particular on the position of middle attainers, who constitute a large proportion of the cohort and whose progress will be vital in realising the government's goal of ‘Raising the Participation Age’ to 18 by 2015. The paper draws on evidence from national research undertaken as part of the Nuffield Review of 14–19 Education and Training in England and Wales and analysis of New Labour and Coalition policy between 2000–2012. It uses a three‐year local study of 2400 14‐ and 16‐year‐olds in an established school/college consortium to illustrate the effects of policy and practice on middle attainers. We argue that this important group of young people was ‘half‐served’ by New Labour, because of its incomplete and contradictory 14–19 reforms, and is now being ‘overlooked’ by Coalition policy because of its emphasis on high attainers. We conclude by suggesting a range of measures to support the 14+ participation, progression and transition of middle attainers in the English education and training system.     

The preschool bathroom: making ‘problem bodies’ and the limit of the disciplinary regime over children

In this paper we study the effects of power in a bathroom, which is a rarely analysed space in preschools, using empirical examples from a semi-ethnographic study conducted in New South Wales, Australia. We demonstrate that educators’ understanding and practices mostly consider their own positioning in discourses and come short in accounting for children’s practices in and expressed views on the bathroom. Educators also remain distant from children’s bodily experiences. The interplay of the open architectural design of the bathroom space and dominant discourses operating in the preschool constitute some children as ‘problem bodies’ apparently requiring (and justifying) direct intervention. Following this reasoning we argue that the surveillance, regularisation and normalisation in the bathroom is far from total, which leads us to question the adequacy of understanding the bathroom as forming a part of a modern (disciplinary) institution.     

Teachers,Arts Practice and Pedagogy

What are possible overlaps between arts practice and school pedagogy? How is teacher subjectivity and pedagogy affected when teachers engage with arts practice, in particular, theatre practices? We draw on research conducted into the Learning Performance Network (LPN), a project that involved school teachers working with the Royal Shakespeare Company and the University of Warwick. The aim of the commissioned research was to look at the effects on teacher development, focusing on the active rehearsal room pedagogic techniques and ensemble methods of exploring Shakespearean text and performance. The practices of working as an ensemble through rehearsal room pedagogy were central to the LPN. Our interest is in looking for possible shifts in teachers’ subjectivity, their self-perception. What affordances, limitations, accommodations and tensions are experienced by the teachers in transposing work from the rehearsal room to the classroom? We draw on a range of cultural theories that provide complementary perspectives on aspects of subjectivity; these include Vygotskian approaches to the psychology of art and acting. Raymond Williams’s work on the ‘dramatized society’ and Jacques Rancière’s work on spectatorship and pedagogy. Data in the form of excerpts from field notes, taken in an introductory workshop where teachers worked with theatre practitioners, and from transcribed interviews with participants in the project are used to provide evidence of shifts in perspective, self-perception and pedagogic practice.     

A sociocultural perspective as a curriculum change in health and physical education

As a lens through which to read and understand a subject area and its curriculum content and issues, a sociocultural perspective is a recent and arguably significant change for the Health and Physical Education (HPE) Key Learning Area (KLA) in Australia. Its significance lies, first, in the fact that it seems to represent a notable departure from the predominantly medico-scientific, bio-physical and even psychological foundations of the learning area as it stood throughout the second half of the twentieth century, and second, because its attention to social and cultural influences on health put it in direct opposition to notions which locate health almost solely in the individual and his or her decisions. Despite the potential ramifications of these shifts for practitioners, to date there has been little research that has examined this change within the context of the classroom. This paper reports on a research project conducted in two classrooms in the Australian state of New South Wales, which began with the question ‘what happens when you introduce a unit of work planned with the aim of developing a sociocultural perspective into the HPE classroom?’ I respond to this question by drawing on teacher and student interviews, planning sessions, and classroom observations and recordings to discuss the most prominent discursive tensions and organisational constraints that stand as impediments to a sociocultural perspective as a practiced curriculum change.     

维吾尔族7—18岁城乡青少年身体形态比较

了解维吾尔族青少年身体形态状况、形态发育的变化特点及其变化规律,为改善维吾尔族青少年体质健康水平提供依据。采用专家访谈法、测试和数理统计法,于2012年10—12月,对新疆和田地区中小学7—18岁4800名维吾尔族青少年的身高、体重和胸围指标进行统计分析,并针对问题提出相关建议。     

Athlete burnout in elite sport: A self-determination perspective

Abstract

The practice of exercise has shown to be beneficial to quality of life of individuals with HIV/AIDS. Thus, the present study analysed the effects of a combined exercise training in persons living with HIV/AIDS. Ten participants participated in the present study. The following variables were analysed: viral load and cell counts for TCD4+/TCD8; maximal oxygen consumption (VO_2max); total mass, absolute fat mass, relative fat mass, absolute lean mass, relative lean mass and body mass index; fasting glycaemia, fasting insulinaemia, homeostatic model assessment (HOMA) index (insulin resistance – homeostatic model assessment (IR-HOMA)); total cholesterol, triglycerides, high-density lipoprotein (HDL), very low-density lipoprotein (VLDL), low-density lipoprotein (LDL); superoxide dismutase, catalase, glutathione peroxidase activities; thiobarbituric acid reactive substances. The combined exercise training consisted of resistance exercises plus aerobic training (60 min · session^?1, three times per week, during 20 weeks). The number of TCD4+ cells, absolute lean mass and relative lean mass, muscle strength for the 45° leg press, seated row and triceps extension, HDL-c levels as well as VO_2max increased post-training. The activity of superoxide dismutase, catalase, glutathione peroxidase enzymes and thiobarbituric acid reactive substances levels were diminished post-training. Finally, it can be concluded that combined exercise training is able to change positively several variables related to health of individuals with HIV/AIDS, mainly the immune system as well as antioxidant mechanisms re-establishment.     

Effects of weighted sled towing on ground reaction force during the acceleration phase of sprint running

Abstract

Athletes use weighted sled towing to improve sprint ability, but little is known about its biomechanics. The purpose of this study was to investigate the effect of weighted sled towing with two different loads on ground reaction force. Ten physically active men (mean ± SD: age 27.9 ± 1.9 years; stature 1.76 ± 0.06 m; body mass 80.2 ± 9.6 kg) performed 5 m sprints under three conditions; (a) unresisted, (b) towing a sled weighing 10% of body mass (10% condition) and (c) towing a sled weighing 30% of body mass (30% condition). Ground reaction force data during the second ground contact after the start were recorded and compared across the three conditions. No significant differences between the unresisted and 10% conditions were evident, whereas the 30% condition resulted in significantly greater values for the net horizontal and propulsive impulses (P < 0.05) compared with the unresisted condition due to longer contact time and more horizontal direction of force application to the ground. It is concluded that towing a sled weighing 30% of body mass requires more horizontal force application and increases the demand for horizontal impulse production. In contrast, the use of 10% body mass has minimal impact on ground reaction force.