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Search Results: 1 - 10 of 11745 matches for " Ian Brown "
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Ambivalence and obesity stigma in decisions about weight management: A qualitative study  [PDF]
Ian Brown, Alex McClimens
Health (Health) , 2012, DOI: 10.4236/health.2012.412A224
Background: Many adults do not take up weight management interventions even after apparently deciding to do so. Further research about decision making prior to the intervention would be useful. This paper presents a qualitative study exploring the process of decision making and the influences of obesity stigma. Methods: A pragmatic qualitative methodology, conducting indepth interviews with 52 participants all with BMI > 30 kg/m2 and experience of efforts at weight management. Equal numbers of men and women with mean age 56.9 years completed interviews. Inductive analyses proceeded through systematic steps over a series of iterations. Findings: Decision making is difficult in the context of on-going mixed feelings over a long time. Thoughts and feelings become ingrained with habits and it is hard to separate out what is needed to think through a good decision. Thinking about weight brings a large volume of thoughts and feelings and apparent options or action choices. The volume of thoughts makes decisions difficult but, in the context of obesity stigma, many of the thoughts are negative. A variable sensitivity to these stigma-related thoughts adds further ambivalence and inhibition for taking deciions. The need for further thinking does not stand out in the context of the emotional resolving of thoughts about personal responsibility arising from obesity stigma. Conclusions: Obesity stigma contributes to a deeper ambivalence in the decision process and hence difficulty in decision making about weight management. Decision aid interventions and training of health care staff in communication skills for shared decision making are needed.
Qualitative studies of obesity: A review of methodology  [PDF]
Ian Brown, Jill Gould
Health (Health) , 2013, DOI: 10.4236/health.2013.58A3010

BACKGROUND: There is a developing interest in qualitative research to understand the perspectives and experiences of people living with obesity. However, obesity is a stigmatised condition associated with negative stereotypes. Social contexts emphasizing large body size as a problem, including research interviews, may amplify obesity stigma. This study reviews the methodology employed by qualitative studies in which study participants were obese and data collection involved face-to-face interviews. METHODS: Database searches identified qualitative studies meeting inclusion criteria from 1995 to 2012. Following screening and appraisal data were systematically extracted and analyzed from 31 studies. RESULTS: The studies included 1206 participants with a mean age of 44 years and mean BMI of37 kg/m2. Women (78.8%) outnumbered men (21.2%) by four to one. Socio-economic background was not consistently reported. The studies employed similar, typically pragmatic, qualitative methodologies, providing rich textual data on the experience of obesity derived from face-to-face interviews. The majority considered quality issues in data collection, analyses and generalizability of findings. However, the studies were weak as regards researcher reflexivity in relation to interviewer characteristics and obesity stigma. CONCLUSIONS: The impact of obesity stigma has not been attended to in the qualitative research. Clear information about study

Two-particle irreducible effective actions versus resummation: analytic properties and self-consistency
Michael Brown,Ian Whittingham
Physics , 2015, DOI: 10.1016/j.nuclphysb.2015.09.021
Abstract: Approximations based on two-particle irreducible (2PI) effective actions (also known as $\Phi$-derivable, Cornwall-Jackiw-Tomboulis or Luttinger-Ward functionals depending on context) have been widely used in condensed matter and non-equilibrium quantum/statistical field theory because this formalism gives a robust, self-consistent, non-perturbative and systematically improvable approach which avoids problems with secular time evolution. The strengths of 2PI approximations are often described in terms of a selective resummation of Feynman diagrams to infinite order. However, the Feynman diagram series is asymptotic and summation is at best a dangerous procedure. Here we show that, at least in the context of a toy model where exact results are available, the true strength of 2PI approximations derives from their self-consistency rather than any resummation. This self-consistency allows truncated 2PI approximations to capture the branch points of physical amplitudes where adjustments of coupling constants can trigger an instability of the vacuum. This, in effect, turns Dyson's argument for the failure of perturbation theory on its head. As a result we find that 2PI approximations perform better than Pad\'e approximation and are competitive with Borel-Pad\'e resummation. Finally, we introduce a hybrid 2PI-Pad\'e method.
The McKay correspondence, tilting equivalences, and rationality
Morgan Brown,Ian Shipman
Mathematics , 2013,
Abstract: We consider the problem of comparing t-structures under the derived McKay correspondence and for tilting equivalences. We relate the t-structures using certain natural torsion theories. As an application, we give a criterion for rationality for surfaces with a tilting bundle. In particular we show that every smooth projective surface which admits a full, strong, exceptional collection of line bundles is rational.
Electric Fields and Inflammation: May the Force be with You
Simon B. Brown,Ian Dransfield
The Scientific World Journal , 2008, DOI: 10.1100/tsw.2008.158
The color-magnitude distribution of small Jupiter Trojans
Ian Wong,Michael E. Brown
Physics , 2015, DOI: 10.1088/0004-6256/150/6/174
Abstract: We present an analysis of survey observations targeting the leading L4 Jupiter Trojan cloud near opposition using the wide-field Suprime-Cam CCD camera on the 8.2 m Subaru Telescope. The survey covered about 38 deg$^2$ of sky and imaged 147 fields spread across a wide region of the L4 cloud. Each field was imaged in both the $g'$ and the $i'$ band, allowing for the measurement of $g-i$ color. We detected 557 Trojans in the observed fields, ranging in absolute magnitude from $H=10.0$ to $H = 20.3$. We fit the total magnitude distribution to a broken power law and show that the power-law slope rolls over from $0.45\pm 0.05$ to $0.36^{+0.05}_{-0.09}$ at a break magnitude of $H_{b}=14.93^{+0.73}_{-0.88}$. Combining the best-fit magnitude distribution of faint objects from our survey with an analysis of the magnitude distribution of bright objects listed in the Minor Planet Center catalog, we obtain the absolute magnitude distribution of Trojans over the entire range from $H=7.2$ to $H=16.4$. We show that the $g-i$ color of Trojans decreases with increasing magnitude. In the context of the less-red and red color populations, as classified in Wong et al. 2014 using photometric and spectroscopic data, we demonstrate that the observed trend in color for the faint Trojans is consistent with the expected trend derived from extrapolation of the best-fit color population magnitude distributions for bright catalogued Trojans. This indicates a steady increase in the relative number of less-red objects with decreasing size. Finally, we interpret our results using collisional modeling and propose several hypotheses for the color evolution of the Jupiter Trojan population.
SKA Engineering Change Proposal: Gridded Visibilities to Enable Precision Cosmology with Radio Weak Lensing
Ian Harrison,Michael L. Brown
Physics , 2015,
Abstract: This document was submitted as supporting material to an Engineering Change Proposal (ECP) for the Square Kilometre Array (SKA). This ECP requests gridded visibilities as an extra imaging data product from the SKA, in order to enable bespoke analysis techniques to measure source morphologies to the accuracy necessary for precision cosmology with radio weak lensing. We also discuss the properties of an SKA weak lensing data set and potential overlaps with other cosmology science goals.
Total Synthesis of Annonaceous Acetogenins Belonging to the Non-Adjacent Bis-THF and Non-Adjacent THF-THP Sub-Classes
Ian B. Spurr,Richard C. D. Brown
Molecules , 2010, DOI: 10.3390/molecules15010460
Abstract: The synthesis of the subgroups of acetogenins containing non-adjacent bis-THF and non-adjacent THF-THP core units is reviewed. Specifically, total syntheses of gigantecin, 4-deoxygigantecin, cis-sylvaticin, squamostatin-C, squamostatin-D, sylvaticin and mucocin are discussed.
Media analysis and production: developing multiliteracies in technology-enhanced environments
Natalie Cooper,Lori Lockyer,Ian Brown
ITALICS , 2006,
Abstract: The transformation of our lives through new technologies and globalisation presents educators with the challenge of helping students to develop the skills and competencies that will enable them to function successfully in this dynamic society. This article reports on a single-case pilot study conducted to trial and evaluate an educational program and support resources. The purpose of this research was to explore whether this educational program implemented within a technology-rich environment, incorporating teaching and learning strategies based on constructivist approaches, supports the development of multiliteracies. A Grade 10 English class in a high school in New South Wales, Australia participated in the educational program that involved the analysis, construction and evaluation of media and news items. The study addressed the question of how the participation in a media analysis and production curriculum unit, influences the development of multiliteracies. Students’ understanding and use of key media, information, visual and technological concepts, as well as their understanding and use of technology were explored. The findings suggest that the implementation of such a program can assist students in developing multiliteracies and that most students found the experience of digital video construction motivating. Based on the findings from the pilot study the educational program and resources were revised and refined prior to the implementation of the study across multiple cases in the subsequent academic year.
Induction of ischemic stroke in awake freely moving mice reveals that isoflurane anesthesia can mask the benefits of a neuroprotection therapy
Angela Seto,Ian Swan,Craig E. Brown
Frontiers in Neuroenergetics , 2014, DOI: 10.3389/fnene.2014.00001
Abstract: Anesthetics such as isoflurane are commonly used to sedate experimental animals during the induction of stroke. Since these agents are known to modulate synaptic excitability, inflammation and blood flow, they could hinder the development and discovery of new neuroprotection therapies. To address this issue, we developed a protocol for inducing photothrombotic occlusion of cerebral vessels in fully conscious mice and tested two potential neuroprotectant drugs (a GluN2B or α4β2 nicotinic receptor antagonist). Our data show in vehicle treated mice that just 20 min of exposure to isoflurane during stroke induction can significantly reduce ischemic cortical damage relative to mice that were awake during stroke. When comparing potential stroke therapies, none provided any level of neuroprotection if the stroke was induced with anesthesia. However, if mice were fully conscious during stroke, the α4β2 nicotinic receptor antagonist reduced ischemic damage by 23% relative to vehicle treated controls, whereas the GluN2B antagonist had no significant effect. These results suggest that isoflurane anesthesia can occlude the benefits of certain stroke treatments and warrant caution when using anesthetics for pre-clinical testing of neuroprotective agents.
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