Effect of substrate surface topography on forensic development of latent fingerprints with iron oxide powder suspension

This is a pre-print version of the article. The official published version can be accessed from the link below - Copyright @ 2010 Wiley-BlackwellLatent fingerprint deposition and effectiveness of detection are strongly affected by the surface on which prints are deposited. Material properties, surface roughness, morphology, chemistry and hydrophobicity can affect the usefulness or efficacy of forensic print development techniques. Established protocols outline appropriate techniques and sequences of processes for broad categories of operational surfaces. This study uses atomic force microscopy and scanning electron microscopy to investigate a series of surfaces classified as smooth, non-porous plastic. Latent prints developed with iron oxide powder suspension are analysed on a range of scales from macro to nano to help elucidate the interaction mechanisms between the latent fingerprint, development agent and underlying surface. Differences between surfaces have a strong effect, even within this single category. We show that both average roughness and topographical feature shape, characterised by skew, kurtosis and lay, are important factors to consider for the processing of latent fingerprints. Copyright (C) 2010 John Wiley & Sons, Ltd.This work is part-funded by the UK Home Office project 7088762

Learning Lessons: Using Inquiries for Change

This article is not about the procedure of inquiry investigation, nor is it about the content of the inquiry report or recommendations. Our focus here is on the post-inquiry process – what happens after an inquiry’s recommendations are made

Reflection in a high-performance sport coach education program: a Foucauldian analysis of coach developers

Reflection is a contested but taken for granted concept, whose meaning shifts to accommodate the interpretation and interests of those using the term. Subsequently, there is limited understanding of the concept. The purpose of this article was to consider critically the discursive complexities of reflection and their articulation through coach developers’ practice. Data were collected from a National High-Performance coach education program. Coach developers responsible for one-to-one support (n = 8) and on-program support (n = 3) participated in the research. Semistructured interviews were conducted with coach developers, and participant observations were undertaken of a coach developer forum and program workshops (n = 9). Foucault’s concepts: power, discourse, and discipline were used to examine data with critical depth. Analysis explored “Discourse of Reflection,” “Discipline, Power, and Reflection,” and “Coach Developers: Confession, ‘Empowerment,’ and Reflection.” Humanistic ideas constructed a discourse of reflection that was mobilized through coach confession. Coach developer efforts to be “critical” and “learner centered” were embroiled with intrinsic and subtle relations of power as “empowering” intent exacerbated rather than ameliorated its exercise. This article makes visible a different destabilized and problematized version of reflection, thus introducing an awkwardness into the fabric of our experiences of reflection

The Earliest Viking Activity in England?

The Anglo-Saxon Chronicle has been regarded as an unproblematic guide to the first viking raids on the English-speaking peoples. The hiatus in records of viking raids in the Chronicle from AD 794 until 835 has led scholars to believe that southern Britain suffered little piratical activity in those years. This paper uses the evidence of contemporary letters, foreign chronicles and charters to provide an alternative narrative. These sources demonstrate that Kent suffered under the threat of seaborne attacks from the 790s until the 820s when no events are recorded in the Anglo-Saxon Chronicle. The paper invites reconsideration of the textbook accounts of the beginning of the Viking Age in England

Mean field analysis of Williams-Bjerknes type growth

We investigate a class of stochastic growth models involving competition between two phases in which one of the phases has a competitive advantage. The equilibrium populations of the competing phases are calculated using a mean field analysis. Regression probabilities for the extinction of the advantaged phase are calculated in a leading order approximation. The results of the calculations are in good agreement with simulations carried out on a square lattice with periodic boundaries. The class of models are variants of the Williams- Bjerknes model for the growth of tumours in the basal layer of an epithelium. In the limit in which only one of the phases is unstable the class of models reduces to the well known variants of the Eden model.Comment: 21 pages, Latex2e, Elsevier style, 5 figure