8,092 research outputs found

    New H1 results on isolated leptons and missing pt at HERA

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    The search for events containing isolated leptons (electrons or muons) and missing transverse momentum produced in e±pe^{\pm}p collisions is performed with the H1 detector at HERA in the period 1994--2005. The analysed data sample corresponds to an integrated luminosity of 279 pb1^{-1}, which includes 53 pb1^{-1} of e+pe^{+}p data and 107 pb1^{-1} of epe^{-}p data from the new HERA~II phase. A total of 40 events are observed in the data, compared to a Standard Model (SM) prediction of 34.3 ±\pm 4.8. At large hadronic transverse momentum PTX>P_{T}^{X} > 25 GeV, a total of 17 events are observed compared to 9.0 ±\pm 1.5 predicted by the SM. In this region, 15 events are observed in the e+pe^{+}p data compared to a SM prediction of 4.6 ±\pm 0.8, whereas in the epe^{-}p data 2 events are observed compared to a SM prediction of 4.4 ±\pm 0.7.Comment: 4 pages, 4 figure; To appear in the proceedings of 14th International Workshop on Deep Inelastic Scattering (DIS 2006), Tsukuba, Japan, 20-24 Apr 200

    An Evaluation of the Bradford District Health Trainers Programme - Phase 2

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    Health trainers are health workers who offer one-to-one support to help individuals make changes to improve their health. The government regards health trainers as being an important mechanism to help tackle health inequalities through improving access to health advice, support and services in disadvantaged communities (Department of Health, 2005). As one of the 12 early adopter sites of the national health trainer programme, Bradford was one of the first places in the country to have health trainers working out in local communities. The early adopter phase was evaluated in 2006 to provide feedback on the development and functioning of the programme and any early outcomes. The evaluation findings indicated that the health trainer role was successful at supporting people to make changes to improve their health. Since the initial evaluation one significant development has been the piloting of the senior health trainer role. Three senior health trainers were recruited in November 2006 and placed in three localities, all areas of disadvantage. Their role was to support the work of health trainers on the ground and to use community development skills to improve access to the health trainer programme. At the time of the second evaluation there were 32 health trainers and 3 senior health trainers working in Bradford providing support to those individuals and communities with greatest health needs

    An evaluation of the Impaired Glucose Tolerance (IGT) pilot project

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    A pilot project, developed by Bradford and Airedale Teaching PCT was designed to identify patients within general practice with impaired glucose tolerance (IGT) and refer them to public health advisor who could provide support and individually tailored weight management programme over a period of one year. The aim of the IGT project was to prevent progression of IGT to the more serious condition of type 2 diabetes. Six general practices in Bradford and Airedale were involved in referring their clients into the pilot IGT project. This report details the methods and findings for an evaluation undertaken by the Centre for Health Promotion Research at Leeds Metropolitan University. A discussion of evidence and recommendations about the nature and future direction of the pilot project are made in the final sections 5 and 6 respectively

    A numerical determination of the bow shock wave in transonic axisymmetric flow about blunt bodies

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    A numerical method was developed for calculating axisymmetric transonic (M greater than 1) flow about a blunt body; the bow shock wave location was investigated. A Rankine-Hugoniot jump was applied at the shock while relaxation on the isentropic equation of motion was used between shock and body. The shock wave is adjusted by a Newton type iteration scheme. Results are given for a sphere in the Mach number range 1.62 down to 1.02

    RAXBOD: A FORTRAN program for inviscid transonic flow over axisymmetric bodies

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    A program called RAXBOD is presented for the analysis of steady, inviscid, irrotational, transonic flow over axisymmetric bodies in free air. The method solves the exact equation for the disturbance velocity potential function and applies the exact surface boundary condition. Instructions on program usage and listings of the program and sample cases are given

    Evaluating the impact of an enhanced energy performance standard on load-bearing masonry domestic construction: Understanding the gap between designed and real performance: lessons from Stamford Brook.

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    This report is aimed at those with interests in the procurement, design and construction of new dwellings both now and in the coming years as the Government’s increasingly stringent targets for low and zero carbon housing approach. It conveys the results of a research project, carried out between 2001 and 2008, that was designed to evaluate the extent to which low carbon housing standards can be achieved in the context of a large commercial housing development. The research was led by Leeds Metropolitan University in collaboration with University College London and was based on the Stamford Brook development in Altrincham, Cheshire. The project partners were the National Trust, Redrow and Taylor Wimpey and some 60 percent of the planned 700 dwelling development has been completed up to June 2008. As the UK house building industry and its suppliers grapple with the challenges of achieving zero carbon housing by 2016, the lessons arising from this project are timely and of considerable value. Stamford Brook has demonstrated that designing masonry dwellings to achieve an enhanced energy standard is feasible and that a number of innovative approaches, particularly in the area of airtightness, can be successful. The dwellings, as built, exceed the Building Regulations requirements in force at the time but tests on the completed dwellings and longer term monitoring of performance has shown that, overall, energy consumption and carbon emissions, under standard occupancy, are around 20 to 25 percent higher than design predictions. In the case of heat loss, the discrepancy can be much higher. The report contains much evidence of considerable potential but points out that realising the design potential requires a fundamental reappraisal of processes within the industry from design and construction to the relationship with its supply chain and the development of the workforce. The researchers conclude that, even when builders try hard, current mainstream technical and organisational practices together with industry cultures present barriers to consistent delivery of low and zero carbon performance. They suggest that the underlying reasons for this are deeply embedded at all levels of the house building industry. They point out also that without fundamental change in processes and cultures, technological innovations, whether they be based on traditional construction or modern methods are unlikely to reach their full potential. The report sets out a series of wide ranging implications for new housing in the UK, which are given in Chapter 14 and concludes by firmly declaring that cooperation between government, developers, supply chains, educators and researchers will be crucial to improvement. The recommendations in this report are already being put into practice by the researchers at Leeds Metropolitan University and University College London in their teaching and in further research projects. The implications of the work have been discussed across the industry at a series of workshops undertaken in 2008 as part of the LowCarb4Real project (see http://www.leedsmet.ac.uk/as/cebe/projects/lowcarb4real/index.htm). In addition, the learning is having an impact on the work of the developers (Redrow and Taylor Wimpey) who, with remarkable foresight and enthusiasm, hosted the project. This report seeks to make the findings more widely available and is offered for consideration by everyone who has a part to play in making low and zero carbon housing a reality

    Stability analysis of intermediate boundary conditions in approximate factorization schemes

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    The paper discusses the role of the intermediate boundary condition in the AF2 scheme used by Holst for simulation of the transonic full potential equation. It is shown that the treatment suggested by Holst led to a restriction on the time step and ways to overcome this restriction are suggested. The discussion is based on the theory developed by Gustafsson, Kreiss, and Sundstrom and also on the von Neumann method

    Improved Limits on Spin-Dependent WIMP-Proton Interactions from a Two Liter CF3_3I Bubble Chamber

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    Data from the operation of a bubble chamber filled with 3.5 kg of CF3_{3}I in a shallow underground site are reported. An analysis of ultrasound signals accompanying bubble nucleations confirms that alpha decays generate a significantly louder acoustic emission than single nuclear recoils, leading to an efficient background discrimination. Three dark matter candidate events were observed during an effective exposure of 28.1 kg-day, consistent with a neutron background. This observation provides the strongest direct detection constraint to date on WIMP-proton spin-dependent scattering for WIMP masses >20>20 GeV/c2^{2}.Comment: 4 pages, 4 figures V2 submitted to match journal versio

    Towards a middle-range theory of mental health and well-being effects of employment transitions: Findings from a qualitative study on unemployment during the 2009-2010 economic recession.

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    This article builds upon previous theoretical work on job loss as a status passage to help explain how people's experiences of involuntary unemployment affected their mental well-being during the 2009-2010 economic recession. It proposes a middle-range theory that interprets employment transitions as status passages and suggests that their health and well-being effects depend on the personal and social meanings that people give to them, which are called properties of the transitions. The analyses, which used a thematic approach, are based on the findings of a qualitative study undertaken in Bradford (North England) consisting of 73 people interviewed in 16 focus groups. The study found that the participants experienced their job losses as divestment passages characterised by three main properties: experiences of reduced agency, disruption of role-based identities, for example, personal identity crises, and experiences of 'spoiled identities', for example, experiences of stigma. The proposed middle-range theory allows us to federate these findings together in a coherent framework which makes a contribution to illuminating not just the intra-personal consequences of unemployment, that is, its impact on subjective well-being and common mental health problems, but also its inter-personal consequences, that is, the hidden and often overlooked social processes that affect unemployed people's social well-being. This article discusses how the study findings and the proposed middle-range theory can help to address the theoretical weaknesses and often contradictory empirical findings from studies that use alternative frameworks, for example, deprivation models and 'incentive theory' of unemployment

    10 Years of Object-Oriented Analysis on H1

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    Over a decade ago, the H1 Collaboration decided to embrace the object-oriented paradigm and completely redesign its data analysis model and data storage format. The event data model, based on the RooT framework, consists of three layers - tracks and calorimeter clusters, identified particles and finally event summary data - with a singleton class providing unified access. This original solution was then augmented with a fourth layer containing user-defined objects. This contribution will summarise the history of the solutions used, from modifications to the original design, to the evolution of the high-level end-user analysis object framework which is used by H1 today. Several important issues are addressed - the portability of expert knowledge to increase the efficiency of data analysis, the flexibility of the framework to incorporate new analyses, the performance and ease of use, and lessons learned for future projects.Comment: 14th International Workshop on Advanced Computing and Analysis Techniques in Physics Researc
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