ZAP -- Enhanced PCA Sky Subtraction for Integral Field Spectroscopy

We introduce Zurich Atmosphere Purge (ZAP), an approach to sky subtraction based on principal component analysis (PCA) that we have developed for the Multi Unit Spectrographic Explorer (MUSE) integral field spectrograph. ZAP employs filtering and data segmentation to enhance the inherent capabilities of PCA for sky subtraction. Extensive testing shows that ZAP reduces sky emission residuals while robustly preserving the flux and line shapes of astronomical sources. The method works in a variety of observational situations from sparse fields with a low density of sources to filled fields in which the target source fills the field of view. With the inclusion of both of these situations the method is generally applicable to many different science cases and should also be useful for other instrumentation. ZAP is available for download at http://muse-vlt.eu/science/tools.Comment: 12 pages, 7 figures, 1 table. Accepted to MNRA

Learning design approaches for personalised and non-personalised e-learling systems

Recognizing the powerful role that technology plays in the lives of people, researchers are increasingly focusing on the most effective uses of technology to support learning and teaching. Technology enhanced learning (TEL) has the potential to support and transform students’ learning and allows them to choose when, where and how to learn. This paper describes two different approaches for the design of personalised and non-personalised online learning environments, which have been developed to investigate whether personalised e-learning is more efficient than non-personalised e-learning, and discuss some of the student’s experiences and assessment test results based on experiments conducted so far

Interactions between latent fingermarks, deposition surfaces and development agents

This thesis was submitted for the degree of Master of Philosophy and awarded by Brunel University.Fingerprints have provided a crucial source of forensic evidence for well over a century. Their power lies in an inherent ability for human identification and individualisation, which is based on two fundamental properties: uniqueness and lifelong permanence. Latent fingermarks represent by far the most evidentially common and challenging form of deposition, whereby an invisible copy of the unique friction ridge fingertip pattern is left as an amalgamated secretory residue on any surface that is touched. Dry powder dusting, the first and most iconic method for visualising or developing these deposits, was developed in the latter part of the 19th Century. In the period since, a great number of additional techniques, utilising physical, chemical and optical interactions in isolation or combined, have been devised for the same purpose. By selecting the correct technique in the correct order, it is now possible to extract significant print details from an unprecedented variety of surfaces. In the UK, such operational choices are recommended via Home Office issued protocol tables, which offer an optimum guide based on substrate type, substrate properties and fingermark conditions. Development technique specificity has improved in the last half-century alongside increased biochemical understanding of residue composition, however, the shear variety of potential deposition substrates that exist within a heavily industrialised world inevitably causes disparities in efficiency, even within single protocol classifications. These effects are compounded by the enormous potential for pre- and post-deposition residue composition variation, relating to donor factors (age, sex, diet, lifestyle, etc.) and time dependant changes (environmental, biological, etc.) respectively. As a result, routine technique application can cause sub-optimal development. This research utilises high resolution imaging and analysis techniques to demonstrate how subtle surface chemistry and topography features can selectively influence routine technique efficiency within a single protocol classification (smooth, nonporous plastics). Titanium dioxide, a widely used white pigment, has been shown as prevalent in a range of polymers following SEM and EDX analysis, either in a patchy or ubiquitous distribution. SEM analysis demonstrates a strong interaction between the pigment and carbon powder suspension, which causes detrimental overdevelopment effects in off-ridge areas. ToF-SIMS mapping of a Formica substrate places a significant amount of patchy distributed titanium dioxide in the top 30nm of the surface. Mapping also indicated the presence of an aluminosilicate pigment coating; however, it’s involvement in the possible surface potential or surface energy interaction mechanism is unknown The effects of linear surface features, which have previously been implicated in off-ridge cyanoacrylate overdevelopment on two operationally relevant polymers, were also analysed by creating a silicon wafer model for micro-FTIR analysis. Fingermark residues, including hydroxyl groups, have been shown to migrate significant distances along induced scratches in the model substrate over a 48hr period. It is likely that observed overdevelopment along large valley-like features (uPVC) and scratches (polyethylene) in the operationally relevant polymers is caused by a similar migration of residues.This work is funded by the UK Home Office project 7121939

Developing and validating a Telemac3D model for E. coli and norovirus dispersal through aquaculture systems

HydrodynamicsAbstrac

Fold-Back: Using emerging technologies to move from quality assurance to quality enhancement

&lt;p&gt;Emerging technologies offer an opportunity for the development, at the institutional level, of quality processes with greater capacity to enhance learning in higher education than available through current quality processes. These systems offer the potential to extend use of learning analytics in institutional-level quality processes in addition to the widespread focus on business analytics, and to deliver well-constructed mixes of information from different data sources. Borrowed from music amplification, the term &lt;em&gt;fold-back&lt;/em&gt; is proposed as a way to describe such a mix. This paper begins the design-research project of designing effective fold-back systems by expanding the theoretical assumptions about learning embedded in higher education quality processes. A number of theories building on Vygotsky’s cultural-historical approach are discussed to imagine quality in higher education in terms of what students actually do and how they engage in addition to what the institution does. The discussion is summarised in a fold-back matrix capturing the sorts of evaluation questions the systems might address. The paper concludes by providing two initial design sketches for re-purposing emerging technologies with the capacity to support expanded quality processes in education. These sketches are based on the Experience Application Programming Interface (xAPI) and Dedoose technologies.&lt;/p&gt;</jats:p

The mechanism of the Einstellung (set) effect: A pervasive source of cognitive bias

Copyright @ The Authors 2010The eye movements of expert players trying to solve a chess problem show that the first idea that comes to mind directs attention towards sources of information consistent with itself and away from inconsistent information. This bias continues unconsciously even when the player believes he is looking for alternatives. The result is that alternatives to the first idea are ignored. This mechanism for biasing attention ensures a speedy response in familiar situations but it can lead to errors when the first thought that comes to mind is not appropriate. We propose that this mechanism is the source of many cognitive biases from phenomena in problem solving and reasoning, to perceptual errors and failures in memory

Taking up physical activity in later life and healthy ageing: the English longitudinal study of ageing

Background Physical activity is associated with improved overall health in those people who survive to older ages, otherwise conceptualised as healthy ageing. Previous studies have examined the effects of mid-life physical activity on healthy ageing, but not the effects of taking up activity later in life. We examined the association between physical activity and healthy ageing over 8 years of follow-up. Methods Participants were 3454 initially disease-free men and women (aged 63.7±8.9 years at baseline) from the English Longitudinal Study of Ageing, a prospective study of community dwelling older adults. Self-reported physical activity was assessed at baseline (2002–2003) and through follow-up. Healthy ageing, assessed at 8 years of follow-up (2010-2011), was defined as those participants who survived without developing major chronic disease, depressive symptoms, physical or cognitive impairment. Results At follow-up, 19.3% of the sample was defined as healthy ageing. In comparison with inactive participants, moderate (OR, 2.67, 95% CI 1.95 to 3.64), or vigorous activity (3.53, 2.54 to 4.89) at least once a week was associated with healthy ageing, after adjustment for age, sex, smoking, alcohol, marital status and wealth. Becoming active (multivariate adjusted, 3.37, 1.67 to 6.78) or remaining active (7.68, 4.18 to 14.09) was associated with healthy ageing in comparison with remaining inactive over follow-up. Conclusions Sustained physical activity in older age is associated with improved overall health. Significant health benefits were even seen among participants who became physically active relatively late in life