1,734 research outputs found

    Black hole spin constraints on the mass spectrum and number of axionlike fields

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    Astrophysical observations of spinning BHs, which span 5MMBH5×108M 5M_\odot\lesssim M_{\rm BH}\lesssim 5\times 10^8 M_\odot, can be used to exclude the existence of certain massive bosons via the superradiance phenomenon. In this work, we explore for the first time how these measurements can be used to constrain properties of statistical distributions for the masses of multiple bosonic fields. Quite generally, our methodology excludes {\rm ax}\gtrsim 30scalarfieldswitharangeofmassdistributionwidthsandcentralvaluesspanningmanyordersofmagnitude.WedemonstratethisforthespecificexampleofaxionsinstringtheoryandMtheory,wherethemassdistributionsincertaincasestakeuniversalforms.Weplaceupperboundsonax scalar fields with a range of mass distribution widths and central values spanning many orders of magnitude. We demonstrate this for the specific example of axions in string theory and M-theory, where the mass distributions in certain cases take universal forms. We place upper bounds on {\rm ax} for certain scenarios of interest realised approximately as mass distributions in M-theory, including the QCD axion, grand unified theories, and fuzzy dark matter

    Tommy Coleman, Don Johnson, David Owens, Burtson Webster, H. S. Johnson, John A. Stott, Charlie Shira, Shannon Carter, T. A. Mauldin

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    An unidentified man, Tommy Coleman, Don Johnson, David Owens, and Burtson Webster are shown sitting from left to right. Standing from left to right are: H. S. Johnson, JohnA. Stott, an unidentified man, Coach Charlie Shira, Shannon Carter, an unidentified man, and T. A. Mauldin.https://scholarsjunction.msstate.edu/ua-photo-collection/6631/thumbnail.jp

    David Martyn Lloyd-Jones 1899-1981 and twentieth-century evangelicalism.

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    The purpose of this thesis was to demonstrate the significance of the life and ministry of David Martyn Lloyd-Jones in post-war British evangelicalism and to show that, so far as Protestant churches in England and Wales were concerned, no history of the period can afford to ignore him. It is our contention that despite differences of opinion and self- marginalization Lloyd-Jones was and has remained a major force in evangelical thinking. In order to understand how this developed the thesis has been structured along thematic lines highlighting events, persons and questions. The study begins by setting the stage with a biographical chapter and goes on to examine the kind of impact that Lloyd-Jones's preaching had on Christians of all denominations. He believed preaching to be the greatest need of the day and the position of this thesis is that preaching was Lloyd-Jones's greatest contribution to twentieth- century Christianity. As a preacher he attracted one of London's largest congregations and in chapter three we look at the history and nature of Westminster Chapel comparing it with neighbouring ministries, and establishing the kind of people who went to hear him. Chapters four and five ascertain the factors which shaped Lloyd-Jones's views on the church and show how his Reformed evangelicalism led in a separatist as opposed to an ecumenical direction and finally, to a position which was neither Congregational nor Presbyterian. Our further argument is that while he favoured unity among believers his separatist ecclesiology only exacerbated the situation and left evangelicals more divided than before. Chapters six to eight evaluate Lloyd-Jones's background, the nature of his leadership and the extent of his influence - factors which either shaped or were the outcome of his ministry - and looks at the issues which these questions raise

    Clinical_rehab_frailty_prevalence_supplementary_material – Supplemental material for The prevalence of frailty among acute stroke patients, and evaluation of method of assessment

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    Supplemental material, Clinical_rehab_frailty_prevalence_supplementary_material for The prevalence of frailty among acute stroke patients, and evaluation of method of assessment by Martin Taylor-Rowan, Gillian Cuthbertson, Ruth Keir, Robert Shaw, Bogna Drozdowska, Emma Elliott, David Stott and Terence J Quinn in Clinical Rehabilitation</p

    INC914462 Supplementary material - Supplemental material for Equity of access to critical care services in Scotland: A Bayesian spatial analysis

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    Supplemental material, INC914462 Supplementary material for Equity of access to critical care services in Scotland: A Bayesian spatial analysis by Philip Emerson, David R Green, Steve Stott, Graeme Maclennan, Marion K Campbell and Jan O Jansen in Journal of the Intensive Care Society</p

    Group of men

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    Group of men in grain field. Could possibly be Bob Stott with his experimental growing at Borroloola.Miller, David R.Date:191?Const. Bob Stott is the second man from left of photo in light coloured shirt with hat pushed high on forehead. Northern Territory Times & Gazette, 8 December 1911 - "As a sequel to the above experiments severa1 samples of wheat grown down at Borroloola were received in Darwin on the 1ast return trip of the coastal steamer Nelson, comprising in all about 14 different varieties. This was planted by Mr. Stott some time before he left the McArthur River district, in some good black alluvial soil on the bank of a creek." Police Corporal Robert Stott was transferred from Boroloola to Alice Springs in Sept 1911, so the photo was presumably taken in that year. Additional information supplied by Leo Fogarty 21/11/2010

    Music for classical guitar by South African composers : a historical survey, notes on selected works and a general catalogue

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    Includes abstract.Includes bibliographical references (leaves 296-309).This is the first comprehensive investigation of music for, or including, the classical guitar by South African composers. The focus of this research has been, firstly, to uncover as much of the repertoire as possible, and, secondly, to collate, study, catalogue and report on the information. A brief historical survey of the guitar in South Africa provides the context within which this study was conducted. The primary sources of quantitative data collection were through the archival catalogues of the South African Music Rights Organisation and through personal contact with guitarists, composers and guitar teachers. Other sources consulted were publishers, broadcasting corporations, recording companies, libraries and the internet. The body of the dissertation comprises biographical sketches, background notes, analyses and technical notes on 17 selected solo and chamber works dating from 1947 to 2007 by some of South Africa's most prominent composers and guitaristcomposers. The repertoire ranges in style from the traditional and ethnically inspired to the experimental and abstract. As this is an empirical survey, each selected entry includes details on instrumentation, duration, level of difficulty, number of pages, scordatura, commissions or requests, sources or publishers, premières and recordings. A biography of each composer is provided as well as background notes which offer an overview of the selected work. The notes discuss historical, cultural, musical and extra-musical influences, and frequently include references to interview material. The commentaries on the selected works, with musical examples, include an analytical component describing structure, form, stylistic and compositional elements, while the technical observations include performance suggestions and a grading for each work

    Interactive clinical patient scenarios on-line

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    Aims: To develop web-based interactive patient scenarios to support 3rd year medical students.Background: Revision of the third year of the undergraduate programme at the Guy’s, King’s and St Thomas’ School of Medicine for 2005/6 involves production of 36 clinical problem scenarios for three 12 week rotations. Summary of work: We have developed interactive electronic scenarios that guide the user through the stages of patient presentation, examination to discharge and follow up alone and in small groups. The problems are supplemented by further scenario developments and expected outcomes and backed up with face-to-face facilitator contact, automatic links back to preclinical resources for revision and appropriate peer reviewed web sites. Student tracking and progress recording is incorporated into the system. The web-interface has been designed to ensure educational curriculum requirements are appropriately covered. Student tasks are embedded throughout each scenario. Conclusions: Using the expertise of our electronic learning resources team with on-going clinical input from scenario developers and student feedback at all stages we have developed a system tailored to the requirements of our current curriculum, providing students with a viable and effective educational resource covering core material
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