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Sheffield, United Kingdom

Sheffield Hallam University is a university in South Yorkshire, England, based on two sites in Sheffield. City Campus is located in the city centre, close to Sheffield railway station, and Collegiate Crescent Campus is about two miles away, adjacent to Ecclesall Road in south-west Sheffield.The university is the third largest in the UK, with more than 37,000 students , 4,170 staff and 747 courses. Wikipedia.

Bennett L.,Sheffield Hallam University
Environment and Planning D: Society and Space | Year: 2011

This paper reviews existing academic interpretations of 'urban exploration' and argues that focus to date on identifying and celebrating the transgressive and/or emancipatory dimension of this practice has failed to account for the taxonomic and survey-related orientation evident in the author's study of accounts of exploration of Cold War bunkers posted on urban exploration Internet forums. The author's study suggests that the survey and veneration of place evident in these accounts may be a more significant motivation for urban exploration as practised than psychogeographical revere and/or transgressive incursion into space and place. © 2011 Pion Ltd and its Licensors. Source

Pereira Jr. M.F.,Sheffield Hallam University
Journal of the Optical Society of America B: Optical Physics | Year: 2011

This paper describes microscopic calculations of photocurrent generation spectra due to intersubband transitions in semiconductor heterostructures that can extract energy from photons in the terahertz and mid-IR ranges. As expected in the mid-IR, the interconduction conduction band transitions dominate the photocurrent. However, the numerical results presented here show that in the far-IR there is a range in which valence-band-based transitions dominate the photocurrent, and these can be sustained under perpendicular incidence. This would lead to devices that do not need prisms and couplers in contrast with conduction band-based intersubband absorbers. Examples for different quantum well structures and different thermal source temperatures are compared and contrasted numerically. It is further demonstrated that many body effects, so far ignored in simulations of materials for photovoltaic and thermophotovoltaic applications, are shown to be of relevance for both conduction (TM mode) and valence-band based (TE mode) configurations. © 2011 Optical Society of America. Source

Luo Q.,Sheffield Hallam University
Wear | Year: 2011

In this paper, a magnetron sputtered nano-structured multilayer coating TiAlN/VN, grown on hardened tool steel substrate, has been investigated in un-lubricated ball-on-disk sliding tests against an alumina counterface, to study the friction and wear behaviours at a broad range of testing temperatures from 25 to 700°C, followed by comprehensive analysis of the worn samples using FEG-SEM, cross-sectional TEM, EDX, as well as micro/nano indentations. The experiment results indicated significant temperature-dependent friction and wear properties of the coating investigated. Below 100°C, the coating showed low friction coefficient at μ≤0.6 and low wear rate in the scale of 10-17m3N-1m-1 dominated by mild oxidation wear. From 100 to 200°C, a progressive transition to higher friction coefficient occurred. After that, the coating exhibited high friction of μ=0.9 at temperatures between 200 and 400°C, and simultaneously higher wear rates of (10-16 to 10-15) m3N-1m-1. The associated wear mechanism changed to severe wear dominated by cracking and spalling. From 500°C and so on, accelerated oxidation of the TiAlN/VN became the controlling process. This led first to the massive generation of oxide debris and maximum friction of μ=1.1 at 500°C, and then to fast deterioration of the coating despite the lowest friction coefficient of μ<0.3 at 700°C. © 2011 Elsevier B.V. Source

Merchant G.,Sheffield Hallam University
Learning, Media and Technology | Year: 2012

Despite the widespread popularity of social networking sites (SNSs) amongst children and young people in compulsory education, relatively little scholarly work has explored the fundamental issues at stake. This paper makes an original contribution to the field by locating the study of this online activity within the broader terrain of social network theory in order to inform future educational debate and further research. The first section offers a way of classifying different kinds of online social networking and then places this within the context of the study of social networks. It is argued that relational networks create a sense of belonging and that online networks just as easily trace the contours of existing social divisions as they transcend or transform them. This analysis informs the second section which specifically addresses educational issues, including both the attractions and the limitations of such work. The paper concludes with an exploration of three possible approaches to using in SNSs in educational contexts. © 2012 Taylor and Francis Group, LLC. Source

Glazier P.S.,Sheffield Hallam University
Sports Medicine | Year: 2010

This article discusses the main substantive issues surrounding performance analysis and considers future directions in this recently formed sub-discipline of sport science. It is argued that it is insufficient to bring together sport biomechanics and notational analysis on the basis that they share a number of commonalities, such as they both aim to enhance performance, they both make extensive use of information and communications technology, and both are concerned with producing valid and reliable data. Rather, it is suggested that the common factor linking sport biomechanics and notational analysis is that they can both be used to measure and describe the same phenomenon (i.e. emergent pattern formation) at different scales of analysis (e.g. intra-limb, inter-limb and torso, and inter-personal). Key concepts from dynamical system theory, such as self-organization and constraints, can then be used to explain stability, variability and transitions among coordinative states. By adopting a constraints-based approach, performance analysis could be effectively opened up to sport scientists from other sub-disciplines of sport science, such as sport physiology and psychology, rather than solely being the preserve of sport biomechanists and notational analysts. To conclude, consideration is given to how a more unified approach, based on the tenets of dynamical systems theory, could impact on the future of performance analysis. © 2010 Adis Data Information BV. All rights reserved. Source

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