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Moscow, Russia

Yamnova I.A.,Dokuchaev Soil Science Institute | Golovanov D.L.,Moscow Sate University
Eurasian Soil Science

A new map of gypsiferous soils has been developed on the basis of generalized cartographic and analytic data of a detailed soil survey at the Dzhizak Experimental Station. This map reflects the major regularities of the geographic distribution of gypsum pedofeatures in the studied soils. A detailed macro- and micromorphological description of the gypsiferous horizons makes it possible to specify three morphological types of these horizons with incrustation, concretionary, and farinaceous gypsum concentrations. Their spatial distribution is closely related to the soil types, their position in the landscape, the groundwater level, and the type of soil water regime. The necessity to consider gypsiferous soils in the new classification of Russian soils at a high taxonomic level is discussed. A map of the morphological types of gypsiferous horizons has been compiled with the use of GIS-technologies and special scales for the description of the morphological parameters of gypsum pedofeatures. © 2010 Pleiades Publishing, Ltd. Source

Bulychev A.A.,Moscow State University | Kouzakov K.A.,Moscow State University | Popov Y.V.,Moscow Sate University
Physics Letters, Section A: General, Atomic and Solid State Physics

We analyze theoretically laser-assisted electron-impact ionization of atomic hydrogen at high impact energy and large momentum transfer. Considering linearly polarized laser radiation with frequency ω=10.4 fs -1 and intensity W=4 × 10 12 W/cm 2, we describe the field-dressed hydrogen state within time-dependent perturbation theory. We find that even at such moderate field parameters the laser effects on the incident, scattered, and ejected electrons with energies of 1-2 keV can in a dramatic way influence the dependence of the field-assisted differential cross sections on the recoil proton momentum. © 2011 Elsevier B.V. All rights reserved. Source

Larionov G.A.,Moscow Sate University | Bushueva O.G.,Moscow Sate University | Dobrovol'skaya N.G.,Moscow Sate University | Kiryukhina Z.P.,Moscow Sate University | Litvin L.F.,Moscow Sate University
Eurasian Soil Science

Soil erodibility as a function of the soil density was studied in a hydraulic flume. The experiments were performed with mixtures of aggregates and different-sized chernozemic soil particles with the predominance of the fraction of 0. 5-2 mm, which corresponded to their proportions in the plow horizon. It was found that, when the soil density increased, the erodibility abruptly decreased and was well described by a power function with an exponent of -9. 25 (R 2 = 0. 997). The approximate calculation of the contact area between the aggregates showed that the cohesion force between them is not a linear function of the total area of the interaggregate contacts. © 2011 Pleiades Publishing, Ltd. Source

Larionov G.A.,Moscow Sate University | Bushueva O.G.,Moscow Sate University | Dobrovol'skaya N.G.,Moscow Sate University | Kiryukhina Z.P.,Moscow Sate University | And 3 more authors.
Eurasian Soil Science

The rates of the soil loss were studied in a wide range of flow velocities from 0.41 to 1.64 m/s. The results confirmed the main implications of the hydrophysical model: (1) the rate of the soil loss in the region of flow velocities exceeding the threshold value by 1.2-1.5 times and more is proportional to the cubic flow velocity; (2) the detachment of particles in the pre-threshold region is probable in nature, and the relationship between the soil loss and flow velocity is S-shaped. On this basis, a procedure was developed for the experimental determination of the soil erosion parameters: the erodibility, the threshold flow velocity, and the coefficient characterizing the variance of the particles' resistance to detachment. © Pleiades Publishing, Ltd., 2010. Source

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