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  • The Ore bin ; Vol. 26 No. 4 (April 1964)

    Creator:
    Oregon. Dept. of Geology and Mineral Industries, Byrne, John Vincent, 1928-, Wagner, Norman Spencer, and Hoagland, L. L.
    Resource Type:
    Journal
    Full Text:
    RESIDUAL EXPANSIBILITY OF PUMICE By N. S. Wagner* and L. L. Hoagland** Pumice is a glassy, volcanic rock

  • Infrared investigation of some ferroelectric and related compounds : NH₄NCS, (NH₄)₂SO₄, RbHSO₄, and NH₄HSO₄

    Creator:
    Oden, L. L. (Laurance L.)
    Abstract:
    At liquid nitrogen temperature the spectra of sublimed films of NH₄NCS, both as phase I (the usual form stable at room temperature) and phase II (the low temperature form), exhibit detail usually reserved for gases at low pressures. In both phases the symmetry of ammonium ion has degenerated from tetrahedral...
    Resource Type:
    Dissertation
    Full Text:
    final oral Jj /9 Typed by Mrs. L. L. Oden 772 / ACKNOWLEDGEMENT The credit for conception and

  • Grid-Averaged Surface Fluxes

    Creator:
    Mahrt, L.
    Abstract:
    This study examines the inadequacies of formulations for surface fluxes for use in numerical models of atmospheric flow. The difficulty is that numerical models imply spatial averaging over each grid area. Existing formulations am based on the relationship between local fluxes and local gradients and appear to describe the relationship...
    Resource Type:
    Article

  • Mixed Layer Moisture structure

    Creator:
    Mahrt, L.
    Abstract:
    Radiosonde data from the National Hail Research Experiment and the Wangara experiment are examined to study vertical gradients of moisture in heated boundary layers which are well-mixed in virtual potential temperature. The frequent occurrence of a significant decrease of moisture with height in the mixed layer over the high plains...
    Resource Type:
    Article

  • Limit Cycle Mixing

    Creator:
    Mahrt, L.
    Abstract:
    Lagrangian equations for momentum and buoyancy are developed for idealized turbulent fluid elements. The resulting formulation of transport can he viewed as a generalization of mixing length and parcel theories of mixing for application to gridded Eulerian models. This formulation of transport recognizes the mean gradients on the scale of...
    Resource Type:
    Article

  • Vertical Structure and Turbulence in the Very Stable Boundary Layer

    Creator:
    Mahrt, L.
    Abstract:
    The structure of turbulence in a strongly stratified nocturnal boundary layer is studied using fast-response aircraft data collected under clear sky conditions with weak ambient flow. The principal source of turbulence is shear generation near the top of the surface inversion layer. This shear is induced by the development of...
    Resource Type:
    Article

  • Variation of Surface Air Temperature in Complex Terrain

    Creator:
    Mahrt, L.
    Abstract:
    Data from three micronetworks with eddy correlation data and three additional micronetworks without eddy correlation data are analyzed to study the spatial variability of surface air temperature in complex terrain. A simple similarity relationship is constructed to relate the spatial variation of air temperature along the slope to the thermal...
    Resource Type:
    Article
    Full Text:
    Variation of Surface Air Temperature in Complex Terrain L. MAHRT

  • Influence of Low-Level Environment on Severity of High-Plains Moist Convection

    Creator:
    Mahrt, L.
    Abstract:
    Early afternoon environmental conditions preceding hail-producing thunderstorms are statistically compared with conditions for classes of less severe moist convection using only data from individual radiosonde releases collected during the National Hail Research Experiment in northeast Colorado. The ensuing analyses emphasize the thermodynamic characteristics of the mixed layer and immediate overlying...
    Resource Type:
    Article

  • Eddy Asymmetry in the Sheared Heated Boundary Layer

    Creator:
    Mahrt, L.
    Abstract:
    Statistical measures are developed to study the influence of mean shear on the asymmetry of eddy updrafts as observed from low-level aircraft flights in HAPEX, FIFE, and SESAME. This asymmetry involves formation of microfronts between updrafts with slow horizontal motion and downdrafts with faster horizontal motion. The variance of the...
    Resource Type:
    Article

  • Intermittent of Atmospheric Turbulence

    Creator:
    Mahrt, L.
    Abstract:
    Dimensionless structure functions such as kurtosis of the velocity gradients are computed from aircraft data for a variety of atmospheric situations in order to characterize the intermittency of the turbulence. It is necessary to distinguish between small scale intermittency of the velocity gradients organized by the individual main eddies and...
    Resource Type:
    Article