Investigation of metal flow in bridge die extrusion of Alloy 6063 and subsequent effect on surface quality and weld seam integrity

This paper describes a detailed study of tube extrusion by simulation using finite element method (FEM). The finite element model used one-sixth of symmetry. The extrusion load, emperature evolution and metal flow were predicted. Innovative methods, combining both grid and surface tools, were used to define in detail the flow of material. These showed clearly the inner and outer surface formation mechanisms of the tube extrusion. The seam weld, an important quality indicator, was also evaluated by selecting an appropriate criterion

Dynamic Resonance Effects in the Statistical Distributions of Asteroids and Comets

Some principles in the distribution of Centaurs and the "Scattered Disk" objects, as well as the Kuiper belt objects for its semi-major axes, eccentricities and inclinations of the orbits have been investigated. It has been established, that more than a half from them move on the resonant orbits and that is what has been predicted earlier. The divergence of the maximum in the observable distribution of the objects of the Kuiper belt for the semi-major axes with an exact orbital resonance has been interpreted.Comment: 7 pages, 5 figures, 1 table. International Conference "100 years since Tunguska phenomenon: Past, present and future", (June 26-28, 2008. Russia, Moscow), International Conference "Modern problems of astronomy" (August 12-18, 2007, Ukraine, Odessa

A Survey for Outer Satellites of Mars: Limits to Completeness

We surveyed the Hill sphere of Mars for irregular satellites. Our search covered nearly the entire Hill Sphere, but scattered light from Mars excluded the inner few arcminutes where the satellites Phobos and Deimos reside. No new satellites were found to an apparent limiting red magnitude of 23.5, which corresponds to radii of about 0.09 km using an albedo of 0.07.Comment: 5 figures (1 color), 2 Tables, to appear in AJ Nov. 200

Understanding the Psychology of Gang Violence: Implications for Designing Effective Violence Reduction Interventions

An exploratory study to add to the understanding of the psychological processes contributing to violence carried out by gang members

Towards understanding the availability of physiotherapy services in rural Australia

Introduction: A recent exploration of factors affecting rural physiotherapy service provision revealed considerable variation in services available between communities of the study. Multiple factors combined to influence local service provision, including macro level policy and funding decisions, service priorities and fiscal constraints of regional health services and capacity and capabilities at the physiotherapy service level. The aim of this article is to describe the variation in local service provision, the factors influencing service provision and the impact on availability of physiotherapy services. Methods: A priority-sequence mixed methods design structured the collection and integration of qualitative and quantitative data. The investigation area, a large part of one Australian state, was selected for the number of physiotherapy services and feasibility of conducting site visits. Stratified purposive sampling permitted exploration of rural physiotherapy with subgroups of interest, including physiotherapists, their colleagues, managers, and other key decision makers. Participant recruitment commenced with public sector physiotherapists and progressed to include private practitioners, team colleagues and managers. Surveys were mailed to key physiotherapy contacts in each public sector service in the area for distribution to physiotherapists, their colleagues and managers within their facility. Private physiotherapist principals working in the same communities were invited by the researcher to complete the physiotherapy survey. The survey collected demographic data, rural experience, work setting and number of colleagues, services provided, perspectives on factors influencing service provision and decisions about service provision. Semi-structured interviews were conducted with consenting physiotherapists and other key decision makers identified by local physiotherapists. Quantitative survey data were recorded in spreadsheets and analysed using descriptive statistics. Interviews were recorded and transcribed verbatim, with transcripts provided to participants for review. Open-ended survey questions and interview transcripts were analysed thematically. Results: Surveys were received from 11/25 (44%) of facilities in the investigation area, with a response rate of 29.4% (16/54) from public sector physiotherapists. A further 18 surveys were received: five from principals of private physiotherapy practices and 13 from colleagues and managers. Nineteen interviews were conducted: with 14 physiotherapists (nine public, five private), four other decision makers and one colleague. Three decision makers declined an interview. The variation in physiotherapy service availability between the 11 communities of this study prompted the researchers to consider how such variation could be reflected. The influential factors that emerged from participant comments included rurality and population, size and funding model of public hospitals, the number of public sector physiotherapists and private practices, and the availability of specialised paediatric and rehabilitation services. The factors described by participants were used to develop a conceptual framework or index of rural physiotherapy availability. Conclusions: It is important to make explicit the link between workforce maldistribution, the resultant rural workforce shortages and the implications for local service availability. This study sought to do so by investigating physiotherapy service provision within the rural communities of the investigation area. In doing so, varying levels of availability emerged within local communities. A conceptual framework combining key influencing factors is offered as a way to reflect the availability of physiotherapy services

Patient and public involvement and engagement: Practice case study with reflections and learnings from a small rural district general hospital

The notion of patient and public involvement and engagement (PPIE) in research has been around for some time, and it is considered essential to ensure high-quality relevant research that is shared and that will make a difference. This case study of practice aims to share the PPIE practice from Dorset County Hospital NHS Foundation Trust, a small rural district general hospital. It describes the process of recruiting patients and members of the public as research volunteers, as well as the plethora of engagement and involvement activities with which they have been involved to date. This is followed by a reflection on the process and an overview of plans for the future, highlighting key challenges as well as learnings. A dedicated role to support/oversee PPIE activities is recommended to coordinate large groups of research volunteers, as well as to monitor the important impact of their input, which is considerable. Increasing diversity and access to under-served groups, and embedding the research volunteer role within the wider clinical research team, are also highlighted as fundamental challenges, as well as opportunities to make the most from this valuable resource. The case study of practice puts forward a recommendation to all research departments to embed PPIE in all of the work that they do

Optical photon reassignment microscopy (OPRA)

To enhance the resolution of a confocal laser scanning microscope the additional information of a pinhole plane image taken at every excitation scan position can be used (Sheppard 1988). This photon reassignment principle is based on the fact that the most probable position of an emitter is at half way between the nominal focus of the excitation laser and the position corresponding to the (off centre) detection position. Therefore, by reassigning the detected photons to this place, an image with enhanced detection efficiency and resolution is obtained. Here we present optical photon reassignment microscopy (OPRA) which realizes this concept in an all-optical way obviating the need for image-processing. With the help of an additional intermediate optical beam expansion between descanning and a further rescanning of the detected light, an image with the advantages of photon reassignment can be acquired. However, just as in computational photon reassignment, a loss in confocal sectioning performance is caused by working with relatively open pinholes. The OPRA system shares properties such as flexibility and ease of use with a confocal laser scanning microscope, and is therefore expected to be of use for future biomedical routine research

Towards understanding the availability of physiotherapy services in rural Australia

Introduction: A recent exploration of factors affecting rural physiotherapy service provision revealed considerable variation in services available between communities of the study. Multiple factors combined to influence local service provision, including macro level policy and funding decisions, service priorities and fiscal constraints of regional health services and capacity and capabilities at the physiotherapy service level. The aim of this article is to describe the variation in local service provision, the factors influencing service provision and the impact on availability of physiotherapy services. Methods: A priority-sequence mixed methods design structured the collection and integration of qualitative and quantitative data. The investigation area, a large part of one Australian state, was selected for the number of physiotherapy services and feasibility of conducting site visits. Stratified purposive sampling permitted exploration of rural physiotherapy with subgroups of interest, including physiotherapists, their colleagues, managers, and other key decision makers. Participant recruitment commenced with public sector physiotherapists and progressed to include private practitioners, team colleagues and managers. Surveys were mailed to key physiotherapy contacts in each public sector service in the area for distribution to physiotherapists, their colleagues and managers within their facility. Private physiotherapist principals working in the same communities were invited by the researcher to complete the physiotherapy survey. The survey collected demographic data, rural experience, work setting and number of colleagues, services provided, perspectives on factors influencing service provision and decisions about service provision. Semi-structured interviews were conducted with consenting physiotherapists and other key decision makers identified by local physiotherapists. Quantitative survey data were recorded in spreadsheets and analysed using descriptive statistics. Interviews were recorded and transcribed verbatim, with transcripts provided to participants for review. Open-ended survey questions and interview transcripts were analysed thematically. Results: Surveys were received from 11/25 (44%) of facilities in the investigation area, with a response rate of 29.4% (16/54) from public sector physiotherapists. A further 18 surveys were received: five from principals of private physiotherapy practices and 13 from colleagues and managers. Nineteen interviews were conducted: with 14 physiotherapists (nine public, five private), four other decision makers and one colleague. Three decision makers declined an interview. The variation in physiotherapy service availability between the 11 communities of this study prompted the researchers to consider how such variation could be reflected. The influential factors that emerged from participant comments included rurality and population, size and funding model of public hospitals, the number of public sector physiotherapists and private practices, and the availability of specialised paediatric and rehabilitation services. The factors described by participants were used to develop a conceptual framework or index of rural physiotherapy availability. Conclusions: It is important to make explicit the link between workforce maldistribution, the resultant rural workforce shortages and the implications for local service availability. This study sought to do so by investigating physiotherapy service provision within the rural communities of the investigation area. In doing so, varying levels of availability emerged within local communities. A conceptual framework combining key influencing factors is offered as a way to reflect the availability of physiotherapy services