110,535 research outputs found

    Message from the Board of Visitors\u27 Chair

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    Politics, Inflation, and the Mundell-Tobin Effect

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    This paper addresses the possibility of a correlation between inflation and investment for countries with inflation below 20%. The existing literature typically finds no correlation below this level of inflation. By instrumenting with an extensive set of political stability and regime variables I have shown that within a lower range of inflation rates, between 5% and 9%, this correlation is positive, highly significant, and shows no signs of reverse causality.Politics, Inflation, Investment, Mundell, Tobin

    Geometry definition and grid generation for a complete fighter aircraft

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    Recent advances in computing power and numerical solution procedures have enabled computational fluid dynamicists to attempt increasingly difficult problems. In particular, efforts are focusing on computations of complex three-dimensional flow fields about realistic aerodynamic bodies. To perform such computations, a very accurate and detailed description of the surface geometry must be provided, and a three-dimensional grid must be generated in the space around the body. The geometry must be supplied in a format compatible with the grid generation requirements, and must be verified to be free of inconsistencies. This paper presents a procedure for performing the geometry definition of a fighter aircraft that makes use of a commercial computer-aided design/computer-aided manufacturing system. Furthermore, visual representations of the geometry are generated using a computer graphics system for verification of the body definition. Finally, the three-dimensional grids for fighter-like aircraft are generated by means of an efficient new parabolic grid generation method. This method exhibits good control of grid quality

    An Unusual Moving Boundary Condition Arising in Anomalous Diffusion Problems

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    In the context of analyzing a new model for nonlinear diffusion in polymers, an unusual condition appears at the moving interface between the glassy and rubbery phases of the polymer. This condition, which arises from the inclusion of a viscoelastic memory term in our equations, has received very little attention in the mathematical literature. Due to the unusual form of the moving-boundary condition, further study is needed as to the existence and uniqueness of solutions satisfying such a condition. The moving boundary condition which results is not solvable by similarity solutions, but can be solved by integral equation techniques. A solution process is outlined to illustrate the unusual nature of the condition; the profiles which result are characteristic of a dissolving polymer

    Mechanism for the failure of the Edwards hypothesis in the SK spin glass

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    The dynamics of the SK model at T=0 starting from random spin configurations is considered. The metastable states reached by such dynamics are atypical of such states as a whole, in that the probability density of site energies, p(λ)p(\lambda), is small at λ=0\lambda=0. Since virtually all metastable states have a much larger p(0)p(0), this behavior demonstrates a qualitative failure of the Edwards hypothesis. We look for its origins by modelling the changes in the site energies during the dynamics as a Markov process. We show how the small p(0)p(0) arises from features of the Markov process that have a clear physical basis in the spin-glass, and hence explain the failure of the Edwards hypothesis.Comment: 5 pages, new title, modified text, additional reference

    Gaston Memorial Hospital: Driving Quality Improvement With Data, Guidelines, and Real-Time Feedback

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    Describes efforts to reduce variance in provider practice patterns through data analysis and benchmarking of process-of-care measures. Discusses strategies such as sharing data, feedback, and best practices in ways physicians can utilize them immediately

    Culturally Responsive Teaching For Significant Relationships

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    This article expands discussions of culturally responsive teaching to include the framework of what it is, why it matters and how it can be accomplished in the classroom. The four principles of interaction, accommodation, ownership, and opportunity outline culturally responsive strategies teachers use to create significant relationships with all students in the classroom
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