Asymptotic behaviour of a turbulent mixing path near a wave layer

The paper reports on a class of models for a turbulent boundary layer which are based on the turbulent energy balance equation and closure and use hypothesis of the type of Karman relations for turbulent mixing paths or complementary transport equations. It is shown that in the absence of a velocity shear near the kinetic turbulent energy flux all the models are encompassed by a unique hypothesis and satisfy with depth a linear dependence of the mixing path.Translated by Vladimir A. Puchkin.     

On one model of the upper boundary layer of the ocean

A steady model of the ocean's upper boundary layer is considered. It uses the dependence on the velocity gradient, suggested in ref. 1, which is analogous to formulae of the Prandtl type for the coefficient of turbulence. The analytical solution of the problem is provided. A numerical estimate of the model's parameters points to satisfactory concordance with the field data for various characteristics.Translated by Mikhail M. Trufanov.     

Low-sulfide PGE mineralization in layered intrusion ring,Vestfold Hills,Antarctica

This paper presents results of the study of norite complex from the Vestfold Hills (East Antarctica) containing a low-sulfide type of mineralization. The ore mineralization occurs in specific rock types and along the contact of norites the host rocks. Three mineralization types: Fe–Ni–Cu sulfide, oxide, and PGE-bearing are known. PGE mineralization is represented by palladium–bismuth tellurides of the michenerite–merenskyite series. A model of ore-formation succession and a concept of the origin of low-sulfide PGE mineralization by means of crystallization and subsequent evolution of monosulfide and intermediate solid solutions have been developed.     

Platinoan Vysotskite with Inverse Zoning and Skeletal Cooperite in Metamorphosed Sulfide Ores Within the Eastern Flank of the Oktyabrskoe Deposit,Noril’sk ore Field

Geology of Ore Deposits - Platinoan vysotskite metacrystals with inverse zoning are described. Their size is up to 0.5 mm. Association of these metacrystals are characterized by a...     

Long-Term Dynamics of the Concentrations of Organochlorine Compounds and Mercury in the Bottom Sediments of the Chernorechenskoe Reservoir

Water Resources - The accumulation of organochlorine compounds (OCs) and mercury in the bottom sediments of the Chernorechenskoe Reservoir since the mid-1960s to 2008 has been studied....     

Gas hydrates that outcrop on the sea floor: stability models

 The detection of sea-floor gas hydrates (GHs) proves that they can coexist in contact with seawater. We calculate that sea-floor hydrates undergo rapid dissolution, yet they are maintained by the constant high rate of upward migration of gas-saturated waters. If upward migration originates from a point source, then the thickness of sea-floor hydrates varies with distance from the center of the upwelling (depending on heat flow). However, near-surface fracturing may control the actual points of exit onto the sea floor above. If gas migration rates decrease from the center of the mud volcano to its periphery, a concentric pattern in distribution of temperature, methane concentration, and GH contents can be described.     

Landsat Land Use Classification for Assessing Health Risk from Industrial Air Pollution

Izvestiya, Atmospheric and Oceanic Physics - This study investigated to what extent risk estimates can be modified by involving in the process readily available space data and well-tested...