12,641 research outputs found

    Addition of a gamma ray spectrometer to the alpha scattering experiment as designed for the Surveyor mission

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    Gamma ray spectroscopy and alpha scattering techniques for compositional analysis of lunar and planetary surface

    Lattice QCD at finite temperature: Evidence for calorons from the eigenvectors of the Dirac operator

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    We analyze the eigenvalues and eigenvectors of the staggered Dirac operator in quenched lattice QCD in the vicinity of the deconfinement phase transition using the L\"uscher-Weisz gauge action. The spectral and localization properties of the low-lying eigenmodes show characteristic differences between the Z_3 sectors above the critical temperature T_c. These findings can be interpreted in terms of calorons.Comment: Lattice2001(hightemp), 3 pages, 2 figure

    H. A. Fennerty, O. T. Harrington to Mississippi Alpha Phi Delta Theta Fraternity, 25 September 1962

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    Fraternity members in Louisiana urge the Mississipi chapter to rush James Meredith. They cite several reasons and feel [he] will be compatible with members of Mississippi Alpha whom [they] have met.https://egrove.olemiss.edu/west_union_um/1059/thumbnail.jp

    Dynamics of Surface Roughening with Quenched Disorder

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    We study the dynamical exponent zz for the directed percolation depinning (DPD) class of models for surface roughening in the presence of quenched disorder. We argue that zz for (d+1)(d+1) dimensions is equal to the exponent dmind_{\rm min} characterizing the shortest path between two sites in an isotropic percolation cluster in dd dimensions. To test the argument, we perform simulations and calculate zz for DPD, and dmind_{\rm min} for percolation, from d=1d = 1 to d=6d = 6.Comment: RevTex manuscript 3 pages + 6 figures (obtained upon request via email [email protected]

    Observation of a topologically non-trivial surface state in half-Heusler PtLuSb (001) thin films.

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    The discovery of topological insulators, materials with bulk band gaps and protected cross-gap surface states in compounds such as Bi2Se3, has generated much interest in identifying topological surface states (TSSs) in other classes of materials. In particular, recent theoretical calculations suggest that TSSs may be found in half-Heusler ternary compounds. If experimentally realizable, this would provide a materials platform for entirely new heterostructure spintronic devices that make use of the structurally identical but electronically varied nature of Heusler compounds. Here we show the presence of a TSS in epitaxially grown thin films of the half-Heusler compound PtLuSb. Spin- and angle-resolved photoemission spectroscopy, complemented by theoretical calculations, reveals a surface state with linear dispersion and a helical tangential spin texture consistent with previous predictions. This experimental verification of topological behaviour is a significant step forward in establishing half-Heusler compounds as a viable material system for future spintronic devices

    Long-Term Consequences of Congestion Pricing: A Small Cordon in the Hand Is Worth Two in the Bush

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    We evaluate and compare the long-term economic effects of three cordon-based road pricing schemes applied to the Washington, DC, metropolitan area. To conduct this analysis, we employ a spatially disaggregated general equilibrium model of a regional economy that incorporates the decisions of residents, firms, and developers, integrated with a spatially disaggregated strategic transportation planning model that features mode, time period, and route choice. We find that all cordon pricing schemes increase welfare of the residents, as well as lead to GDP growth. At the optimum, the larger cordon and a double cordon lead to higher benefits than the small cordon encompassing downtown core. Nevertheless, the small cordon seems to be a safer bet because when the toll charge is set suboptimally, the net benefits from the small cordon compared to the optimum change negligibly, while the net benefits from the larger cordon decline sharply as the charge deviates from the optimal level.traffic congestion, cordon tolls, land use, welfare analysis, road pricing, general equilibrium, simulation, Washington DC
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