9,658 research outputs found

    Thomas Hutchinson: Traitor to Freedom?

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    Thomas Hutchinson is perhaps one of the most controversial figures of the American Revolution. His Loyalist bent during a time when patriotism and devotion to the American cause was rampant and respected led to his being the target of raids and protests. His actions, particularly his correspondence to Britain regarding the political actions of Bostonians, caused many to question his motives and his allegiance. The following paper will examine Thomas Hutchinson’s Loyalist beliefs, where they originated, and how they affected his political and everyday life. It will examine Thomas Hutchinson’s role during America’s bid for freedom from the Mother Country

    "Sharp Elbows": Do the Middle-Classes have Advantages in Public Service Provision and if so how?

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    This paper summarises for a policy and practice audience the results of a review of the research evidence on middle class advantage in public services from the UK, US and Scandinavian countries published since 1980. The review was conducted by Annette Hastings from the University of Glasgow and Peter Matthews from Heriot-Watt University. Some sixty-five research papers were identified and subjected to systematic analysis in order to draw out key themes and evidence. The authors are grateful to the Arts and Humanities Research Council for funding this research and to a ‘virtual steering board' of policy practitioners for encouragement and guidance. All errors and omissions are the responsibility of the authors. A more detailed account of the research can be found by following links www.connectedcommunities.ac.uk

    An investigation of MAGSAT and complementary data emphasizing precambrian shields and adjacent areas of West Africa and South America

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    Accomplishments with regard to the mapping and analysis of MAGSAT data for the investigation of correlations between the magnetic field characteristics of South American and African shields are reported. Significant results in the interpretation of the global total-field anomalies and the anomaly patterns of Africa and South America are discussed. The central position of the Brazilian shield tends to form a negative total-field anomaly, consistent with findings for shields in equatorial Africa. Sedimentary sequences in the Amazon basin and in the Rio de Janeiro-Sao Paolo areas exhibit positive anomalies, also consistent with equatorial Africa. Results for the Caribbean Sea and Guyana regions are also described

    Do MAGSAT anomalies contain a record of past and present-day mantle convection under South America?

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    Global anomaly maps from the National Aeronautics and Space Administration's Magnetic Field Satellite (MAGSAT) have been spatially filtered to reduce the prominence of long-wavelength east-west bands and to improve the discrimination of anomalies within structural provinces. Previous research suggested a correlation between total-field MAGSAT anomaly lows in equatorial regions with crustal bodies of relatively high average magnetic susceptibility (such as Archaean shields), and of anomaly highs with bodies of low susceptibility (such as deep parts of basins). These correlations reverse at higher latitudes

    An investigation of MAGSAT and complementary data emphasizing Precambrian shields and adjacent areas of West Africa and South America

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    A mineral deposits overlay was prepared to the van der Grinten projection geological world map and coloring of the map was initiated. The Mercator projection version was proofread and some preliminary modeling of MAGSAT anomalies for South America were undertaken

    An investigation of MAGSAT and complementary data emphasizing precambrian shields and adjacent areas of West Africa and South America

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    The problems associated with the use of an interactive magnetic modeling program are reported and a publication summarizing the MAGSAT anomaly results for Africa and the possible tectonic associations of these anomalies is provided. An overview of the MAGSAT scalar anomaly map for Africa suggested a correlation of MAGSAT anomalies with major crustal blocks of uplift or depression and different degrees of regional metamorphism. The strongest MAGSAT anomalies in Africa are closely correlated spatially with major tectonic features. Results indicate that the Bangui anomaly may be caused by a central old Precambrian shield, flanked to the north and south by two relatively young sedimentary basins

    On the interpretation of satellite-derived gravity and magnetic data for studies of crustal geology and metallogenesis

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    Satellite-derived global gravity and magnetic maps have been shown to be useful in large-scale studies of the Earth's crust, despite the relative infancy of such studies. Numerous authors have made spatial associations of gravity or magnetic anomalies with geological provinces. Gravimetric interpretations are often made in terms of isostasy, regional variations of density, or of geodesy in general. Interpretations of satellite magnetic anomalies often base assumptions of overall crustal magnetism on concepts of the vertical and horizontal distribution of magnetic susceptibility, then make models of these assumed distributions. The opportunity of improving our satellite gravity and magnetic data through the proposed Geopotential Research Mission should considerably improve the scientific community's ability to analyze and interpret global magnetic and gravity data

    Disordered Topological Insulators via C∗C^*-Algebras

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    The theory of almost commuting matrices can be used to quantify topological obstructions to the existence of localized Wannier functions with time-reversal symmetry in systems with time-reversal symmetry and strong spin-orbit coupling. We present a numerical procedure that calculates a Z_2 invariant using these techniques, and apply it to a model of HgTe. This numerical procedure allows us to access sizes significantly larger than procedures based on studying twisted boundary conditions. Our numerical results indicate the existence of a metallic phase in the presence of scattering between up and down spin components, while there is a sharp transition when the system decouples into two copies of the quantum Hall effect. In addition to the Z_2 invariant calculation in the case when up and down components are coupled, we also present a simple method of evaluating the integer invariant in the quantum Hall case where they are decoupled.Comment: Added detail regarding the mapping of almost commuting unitary matrices to almost commuting Hermitian matrices that form an approximate representation of the sphere. 6 pages, 6 figure
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