Comparison of liquid-metal magnetohydrodynamic power conversion cycles

Comparison of liquid metal magnetohydrodynamic power conversion cycle

Report on Phase Three: The professional capabilities framework

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Density Functional Calculations On First-Row Transition Metals

The excitation energies and ionization potentials of the atoms in the first transition series are notoriously difficult to compute accurately. Errors in calculated excitation energies can range from 1--4 eV at the Hartree-Fock level, and errors as high as 1.5eV are encountered for ionization energies. In the current work we present and discuss the results of a systematic study of the first transition series using a spin-restricted Kohn-Sham density-functional method with the gradient-corrected functionals of Becke and Lee, Yang and Parr. Ionization energies are observed to be in good agreement with experiment, with a mean absolute error of approximately 0.15eV; these results are comparable to the most accurate calculations to date, the Quadratic Configuration Interaction (QCISD(T)) calculations of Raghavachari and Trucks. Excitation energies are calculated with a mean error of approximately 0.5eV, compared with \sim 1\mbox{eV} for the local density approximation and 0.1eV for QCISD(T). These gradient-corrected functionals appear to offer an attractive compromise between accuracy and computational effort.Comment: Journal of Chemical Physics, 29, LA-UR-93-425

The Demoiselles d'Evanston: On the Aesthetics of the Wigmore Chart

Wigmore's ‘The Problem of Proof’, published in 1913, was a path-breaking attempt to systematize the process of drawing inferences from trial evidence. In this paper, written for a conference on visual approaches to evidence, I look at the Wigmore article in relation to cubist art, which coincidentally made its American debut in New York and Chicago the same spring that the article appeared. The point of the paper is to encourage greater attention to the complex meanings embedded in visual diagrams, meanings overlooked by the prevailing cognitive scientific approaches to the Wigmore method

Report on Phase One: The social work curriculum.

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