6,887 research outputs found

    Detecting hydrogen-containing contaminants on metal surfaces

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    Spark emission spectroscopy analyzes surface contamination of metals. This technique controls the quality of surface preparations and is useful in fundamental investigations of surface properties of metals

    Non-negative curvature obstructions in cohomogeneity one and the Kervaire spheres

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    In contrast to the homogeneous case, we show that there are compact cohomogeneity one manifolds, that do not support invariant metrics of non-negative sectional curvature. In fact we exhibit infinite families of such manifolds including the exotic Kervaire spheres. Such examples exist for any codimension of the singular orbits except for the case where both are equal to two, where existence of non-negatively curved metrics is known.Comment: 10 page

    San Juan County Index, 12-12-1902

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    https://digitalrepository.unm.edu/sjc_index_news/1175/thumbnail.jp

    San Juan County Index, 12-19-1902

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    https://digitalrepository.unm.edu/sjc_index_news/1176/thumbnail.jp

    San Juan County Index, 09-26-1902

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    https://digitalrepository.unm.edu/sjc_index_news/1167/thumbnail.jp

    San Juan County Index, 10-24-1902

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    https://digitalrepository.unm.edu/sjc_index_news/1171/thumbnail.jp
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