10 research outputs found

    An Arctic Equivalent of the Grumusol

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    Describes soils near Umiat, Alaska: the gilgai micro- microrelief, sparse vegetation, and the desiccation cracks of considerable depth and width underlying a surface mulch of mineral soil aggregates. At depth, the soils grade into a thick structureless viscous clay which overlies permafrost. The formation of this soil involves processes which operate where soil materials are high in expanding lattice clays of the montmorillonite group. Freezing and evaporation cause desiccation. Thus the genesis of this arctic soil is almost identical with that of grumosols of temperate and warm climates. Soil profiles and tabulated chemical and physical data are included.Un Équivalent arctique du Grumusol. Il existe dans le nord de l'Alaska un équivalent arctique du grumusol. Riche en montmorillonites, il présente un micro-relief en "gilgai" et une surface minérale plutôt dure. Si l'on considère que le gel est essentiellement un processus de dessication qui agit au moins une fois par an dans ces sites, où l'évaporation est plus importante que la précipitation, la genèse de ce sol paraît semblable à celle des grumusols des climats chauds et tempérés. Les auteurs présentent des données chimiques et physiques

    Michel parameters and τ\tau neutrino helicity from decay correlations in Zτ+τ \rightarrow \tau^{+}\tau^{-}

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    Michel parameters and τ\tau neutrino helicity from decay correlations in Zτ+τ \rightarrow \tau^{+}\tau^{-}

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    Michel parameters and τ\tau neutrino helicity from decay correlations in Zτ+τ \rightarrow \tau^{+}\tau^{-}

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    Michel parameters and τ\tau neutrino helicity from decay correlations in Zτ+τ \rightarrow \tau^{+}\tau^{-}

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    Michel parameters and τ\tau neutrino helicity from decay correlations in Zτ+τ \rightarrow \tau^{+}\tau^{-}

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    Michel parameters and τ\tau neutrino helicity from decay correlations in Zτ+τ \rightarrow \tau^{+}\tau^{-}

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    Search for CP violation in the decay Z τ+τ\rightarrow \tau^{+}\tau^{-}

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