Symmetric Presentations of Coxeter Groups

We apply the techniques of symmetric generation to establish the standard presentations of the finite simply laced irreducible finite Coxeter groups, that is the Coxeter groups of types An, Dn and En, and show that these are naturally arrived at purely through consideration of certain natural actions of symmetric groups. We go on to use these techniques to provide explicit representations of these groups.Comment: This is the predecessor of arXiv:0901.2660v1. To appear in the Proceedings of the Edinburgh Mathematical Societ

Asian wheat market and food experience for growers : a final report for the Grains Research and Development Corporation Project DAW637

This project was designed to set up a course which would allow Australian wheat growers and their partners to get closer to the markets that buy their wheat in order to learn more about some of the quality issues that affect the end products. This form of education should assist the wheat industry to move with these changing markets to lean more about them and build some supply chain linkages. This will also help improve grower responsiveness to changing market needs and increase the production of quality wheat

Disability and the Family in South Wales Coalfield Society, c.1920–1939

This article utilises the south Wales coalfield in the interwar period as a case study to illustrate the applicability of two sociological theories ? family systems theory and the social ecology of the family ? to impairment in the past. It demonstrates that a theoretically-informed approach can help to situate impairment in its particular contexts, most especially the family and the community, and give a better sense of the lived experience of disability. It also demonstrates the complexity of the experience of disability as the family and economic circumstances of each impaired individual varied and led to different forms of care-giving or the utilisation of different sources of support. The article also sheds further light on the ubiquity of disability as many families included a number of individuals with different impairments and this too had consequences for experiences and coping strategies.publishersversionPeer reviewe

‘A plentiful crop of cripples made by all this progress’: Disability, Artificial Limbs and Working-Class Mutualism in the South Wales Coalfield, 1890-1948’

Historians of orthopaedics, artificial limbs and disability have devoted a great deal of attention to children and soldiers but have neglected to give sufficient space in their studies to industrial workers, the other patient group that has been identified as crucial to the development of these areas. Furthermore, this attention has led to an imbalanced focus on charitable and philanthropic activities as the main means of assistance and the neglect of a significant part of the voluntary sphere, the labour movement. This article, focusing on industrial south Wales, examines the efforts of workingclass organisations to provide artificial limbs and a range of other surgical appliances to workers and their family members in the late nineteenth and early twentieth centuries. It finds that a distinctive, labourist conception of disability existed which envisaged disabled workers as an important priority and one to which significant time, effort and resources were devoted.Wellcome Trus

The reliability of a tapping test as an indicator of cricket bat performance

Within the sport of cricket it is common practice for players to tap the blade of a bat with a hard wood mallet or cricket ball to gauge its potential playing performance. This subjective assessment can produce contradictory opinions on the same bat. The aim of this study was to investigate the reliability of the ‘tapping’ test in rating the potential performance of cricket bats. This was done by comparing a measurable performance indicator (apparent coefficient of restitution, ACoR) to player assessment. Twenty experienced amateur and semi-pro cricketers completed a scaled-response questionnaire to describe the sound and feel of impact during the ‘tapping’ test, and rate the predicted performance. Correlations between player responses and ACoR were explored. Predicted bat performance by three out of twenty participants showed correlation with ACoR. It was concluded that the tapping test is not a reliable measure of bat performance across the study population. There are indications that individuals can correctly differentiate bats, but there is clear evidence that they also make errors. A further study with a larger number of participants and an exploration of the relative influence of sensory response will yield further insights to this pilot study

Integrated Content and Language Instruction: Lecturers’ Views and Classroom Instructional Practices

The objective of this study was to investigate how integrated content and language instruction, where English is used as the medium of instruction in teaching Mathematics and Science was viewed by the lecturers of the content subjects. The study also examined whether or not it had impacts on the lecturers classroom instructional practices. Cummins’ (1981, 1984) Content Based Instruction approach was used as the framework for the study. This study employed a mixed methods approach combining interview, classroom observation, and a survey questionnaire. Twelve lecturers participated in interviews; twenty responded to a survey questionnaire, and four participated in classroom observations. Findings of the study revealed that most lecturers viewed positively the integrated content and language instruction. This view had impacts on their classroom practices where modifications were made in order to accommodate the implementation of the policy. This study provides information for policy makers, teacher educators, and content teachers to understand how the policy is articulated and how it is implemented in the Indonesian teaching context

Visagraphic eye movement analysis and subjective correlates

The Visagraphic eye movement measurements of fifty-two Pacific University College of Optometry students was compared to the subjective answers to thirteen question concerning reading and visual performance asked of each individual. The objective Visagraphic measurements of Reading Rate With Rereading, Reading Rate Without Re-reading and Relative Efficiency correlated best with overall subjective reading performance, comprehension ability, and necessity to re-read material, other comparisons of subjective ans objective performance showed low correlations

SPRING-LOADED SELF-ALIGNING LIGHTPIPE

Presented herein is a low-cost, assembly-order-versatile, self-aligned lightpipe that is designed for constrained environments

Small linearly equivalent GG-sets and a construction of Beaulieu

Two $G$-sets ($G$ a finite group) are called linearly equivalent over a commutative ring $k$ if the permutation representations $k[X]$ and $k[Y]$ are isomorphic as modules over the group algebra $kG$. Pairs of linearly equivalent non-isomorphic $G$-sets have applications in number theory and geometry. We characterize the groups $G$ for which such pairs exist for any field, and give a simple construction of these pairs. If $k$ is \Q, these are precisely the non-cyclic groups. For any non-cyclic group, we prove that there exist $G$-sets which are non-isomorphic and \lineq over \Q, of cardinality \leq 3(#G)/2. Also, we investigate a construction of P. Beaulieu which allows us to construct pairs of transitive linearly equivalent $S_n$-sets from arbitrary $G$-sets for an arbitrary group $G$. We show that this construction works over all fields and use it construct, for each finite set \mc P of primes, $S_n$-sets linearly equivalent over a field $k$ if and only if the characteristic of $k$ lies in \mc P.Comment: v2: fixed proof of Lemma 2.

Parenteral and oral antibiotic duration for treatment of pediatric osteomyelitis: a systematic review protocol

BACKGROUND: Pediatric osteomyelitis is a bacterial infection of bones requiring prolonged antibiotic treatment using parenteral followed by enteral agents. Major complications of pediatric osteomyelitis include transition to chronic osteomyelitis, formation of subperiosteal abscesses, extension of infection into the joint, and permanent bony deformity or limb shortening. Historically, osteomyelitis has been treated with long durations of antibiotics to avoid these complications. However, with improvements in management and antibiotic treatment, standard of care is moving towards short durations of intravenous antibiotics prior to enteral antibiotics. METHODS/DESIGN: The authors will perform a systematic review based on PRISMA guidelines in order to evaluate the literature, looking for evidence to support the optimal duration of parenteral and enteral therapy. The main goals are to see if literature supports shorter durations of either parenteral antibiotics and/or enteral antibiotics. Multiple databases will be investigated using a thorough search strategy. Databases include Medline, Cochrane, EMBASE, SCOPUS, Dissertation Abstracts, CINAHL, Web of Science, African Index Medicus and LILACS. Search stream will include medical subject heading for pediatric patients with osteomyelitis and antibiotic therapy. We will search for published or unpublished randomized and quasi-randomized controlled trials. Two authors will independently select articles, extract data and assess risk of bias by standard Cochrane methodologies. We will analyze comparisons between dichotomous outcomes using risk ratios and continuous outcomes using mean differences. 95% confidence intervals will be computed. DISCUSSION: One of the major dilemmas of management of this disease is the duration of parenteral therapy. Long parenteral therapy has increased risk of serious complications and the necessity for long therapy has been called into question. Our study aims to review the currently available evidence from randomized trials regarding duration of both parenteral and oral therapy for pediatric acute osteomyelitis. TRIAL REGISTRATION: CRD4201300232