Russian State Agricultural University

www.timacad.ru/
Moscow, Russia

Moscow Timiryazev Agricultural Academy is one of the oldest agrarian educational institution in Russia. It was founded on December 3, 1865. It is under the Supervisory of the Russian Ministry of Agriculture Wikipedia.

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Chigvintsev A.Y.,Moscow Institute of Physics and Technology | Iosilevskiy I.L.,Moscow Institute of Physics and Technology | Noginova L.Y.,Russian State Agricultural University
European Physical Journal: Special Topics | Year: 2017

A new first-order phase transition of gas-liquid type emerges in a modified one-component plasma model with uniformly compressible background. Structure and parameters of this phase transition strongly depend on the value of charge number Z. Under particular values of Z the model shows completely unusual topology of phase diagram. The similar anomalies have been recently observed in more complicated thermodynamic models and even real matter. Thus, deep investigation of the phase diagram properties based on simplified models can help to understand the nature of the phenomenon in more complicated situation. In this study we have improved our previous calculations and utilized more complicated model components equation of state provided by G. Chabrier and A.Y. Potekhin [Phys. Rev. E 58, 4941 (1998)]. © 2017, EDP Sciences and Springer.


Ivlev A.A.,Russian State Agricultural University
BioSystems | Year: 2015

A model of the natural global redox cycle of biospheric carbon is introduced. According to this model, carbon transfer between biosphere and geospheres is accompanied by a conversion of the oxidative forms, presented by CO2, bicarbonate and carbonate ions, into the reduced forms, produced in photosynthesis. The mechanism of carbon transfer is associated with two phases of movement of lithospheric plates. In the short-term orogenic phase, CO2 from the subduction (plates' collisions) zones fills the "atmosphere-hydrosphere" system, resulting in climate warming. In the long-term quiet (geosynclynal) phase, weathering and photosynthesis become dominant depleting the oxidative forms of carbon. The above asymmetric periodicity exerts an impact on climate, biodiversity, distribution of organic matter in sedimentary deposits, etc. Along with photosynthesis expansion, the redox carbon cycle undergoes its development until it reaches the ecological compensation point, at which CO2 is depleted to the level critical to support the growth and reproduction of plants. This occurred in the Permo-Carboniferous time and in the Neogene. Shorter-term perturbations of the global carbon cycle in the form of glacial-interglacial oscillations appear near the ecological compensation point. © 2015 Elsevier B.V. All rights reserved.


Alexandrov O.S.,Russian State Agricultural University | Karlov G.I.,Russian State Agricultural University
Molecular genetics and genomics : MGG | Year: 2016

This article addresses the bioinformatic, molecular genetic, and cytogenetic study of castor bean (Ricinus communis, 2n = 20), which belongs to the monotypic Ricinus genus within the Euphorbiaceae family. Because castor bean chromosomes are small, karyotypic studies are difficult. However, the use of DNA repeats has yielded new prospects for karyotypic research and genome characterization. In the present study, major DNA repeat sequences were identified, characterized and localized on mitotic metaphase and meiotic pachytene chromosomes. Analyses of the nucleotide composition, curvature models, and FISH localization of the rcsat39 repeat suggest that this repeat plays a key role in building heterochromatic arrays in castor bean. Additionally, the rcsat390 sequences were determined to be chromosome-specific repeats located in the pericentromeric region of mitotic chromosome A (pachytene chromosome 1). The localization of rcsat39, rcsat390, 45S and 5S rDNA genes allowed for the development of cytogenetic landmarks for chromosome identification. General questions linked to heterochromatin formation, DNA repeat distribution, and the evolutionary emergence of the genome are discussed. The article may be of interest to biologists studying small genome organization and short monomer DNA repeats.


Zolotarevskaya D.I.,Russian State Agricultural University
Eurasian Soil Science | Year: 2010

Field studies of the rheological properties of loamy sandy soddy-podzolic soils were performed. Within the studied ranges of the soil moistening and bulk density values, the soils behaved as viscoelastic bodies. The dynamic deformation of such soils under compressive stress was modeled by a differential equation of the first order linking the compressive stress, the rate of its changes, and the relative soil deformation in the vertical direction. Correlative relationships between the viscoelastic soil properties, the soil bulk density, the soil water content, and the angular frequency of the harmonic law of the soil deformation were obtained. The methods of calculation of the soil bulk density as dependent on the initial bulk density and the mode of the soil deformation upon cyclic loads by rigid cylinders and by elastic wheels were developed. These methods were realized in a computer program for the quantitative assessment of the effect of the major factors on the changes in the rheological properties, the indices of the soil deformation, and the soil bulk density under the impact of compressive loads. It was shown that an increase in the number of loading-unloading cycles leads to the transformation of the viscoelastic soil properties into elastic properties. © Pleiades Publishing, Ltd. 2010.


Vasenev V.I.,Wageningen University | Vasenev V.I.,Russian State Agricultural University | Stoorvogel J.J.,Wageningen University | Vasenev I.I.,Russian State Agricultural University
Catena | Year: 2013

Soils hold the largest carbon stock in terrestrial ecosystems. Soil organic carbon (SOC) is formed under a combination of bioclimatic and land-use conditions. Therefore, one would expect changes in SOC stocks with land use changes like urbanization. So far, the majority of regional studies on SOC stocks exclude urban areas. The urban environment has a unique set of specific features and processes (e.g., soil sealing, functional zoning, settlement history) that influence SOC stocks and its spatial variability. This study aims to improve our understanding of urban SOC in comparison with agricultural and natural areas for the Moscow region (Russia). SOC content was studied in different land use types, soils, and urban zones through stratified random sampling. Samples of topsoil (0-10. cm) and subsoil (10-150. cm) were taken at 155 locations. SOC contents were significantly higher in urban areas compared with non-urban areas (3.3 over 2.7%). Further analyses proved that the difference can be explained by the so-called "cultural layer", which is the result of human residential activity and settlement history. SOC contents in the urban environment presented a very high spatial heterogeneity with standard deviations of urban SOC considerably higher than those for agricultural and natural areas. Soil depth, soil type and land-use factors had a significant influence on SOC variability determining more than 30% of the total variance. SOC contents in urban topsoil were mostly determined by soil type. In natural and agricultural areas soil type and land-use determined SOC contents. The results confirm the unique character of urban SOC and the need to reconsider established scientific and management views on regional SOC assessment, taking into account the role of urban carbon stocks. © 2013 Elsevier B.V.


Blinov A.P.,Russian State Agricultural University
Mechanics of Solids | Year: 2010

We consider the problem of motion of a heavy particle on the surface of a torus with horizontal axis of rotation. On nondevelopable surfaces other than surfaces of revolution with vertical axis, the solution is known only for the surface of an elliptic paraboloid [1]. To solve the problem on the surface of a torus with horizontal axis of rotation, we use the method of reduction of equations of motion proposed in [2]. We construct the asymptotics of the general and periodic solutions and show that one can use this asymptotics when studying the motion of a heavy particle on an elliptic torus. We obtain the stability conditions in the first approximation for the particle motion along the outer equator and the lower meridian of the torus. © Allerton Press, Inc., 2010.


Barvinsky A.O.,Russian State Agricultural University | Kamenshchik A.Y.,University of Bologna | Kamenshchik A.Y.,L D Landau Institute For Theoretical Physics | Nesterov D.V.,RAS Lebedev Physical Institute
European Physical Journal C | Year: 2015

We present a detailed derivation of the recently suggested new type of hill-top inflation [arXiv:1509.07270] originating from the microcanonical density matrix initial conditions in cosmology driven by conformal field theory (CFT). The cosmological instantons of topology (Formula presented.), which set up these initial conditions, have the shape of a garland with multiple periodic oscillations of the scale factor of the spatial S3-section. They describe underbarrier oscillations of the inflaton and scale factor in the vicinity of the inflaton potential maximum, which gives a sufficient amount of inflation required by the known CMB data. We build the approximation of two coupled harmonic oscillators for these garland instantons and show that they can generate inflation consistent with the parameters of the CMB primordial power spectrum in the non-minimal Higgs inflation model and in R2 gravity. In particular, the instanton solutions provide smallness of inflationary slow-roll parameters (Formula presented.)0 and their relation (Formula presented.) characteristic of these two models. We present the mechanism of formation of hill-like inflaton potentials, which is based on logarithmic loop corrections to the asymptotically shift-invariant tree-level potentials of these models in the Einstein frame. We also discuss the role of (Formula presented.)-gravity as an indispensable finite renormalization tool in the CFT driven cosmology, which guarantees the non-dynamical (ghost free) nature of its scale factor and special properties of its cosmological garland-type instantons. Finally, as a solution to the problem of hierarchy between the Planckian scale and the inflation scale we discuss the concept of a hidden sector of conformal higher spin fields. © 2015, The Author(s).


Blinov A.P.,Russian State Agricultural University
Mechanics of Solids | Year: 2015

The problem of unwinding, under zero gravity, of a pair of dynamically identical bodies (dumbbell-shaped spacecraft) connected by an inextensible weightless film wound as a roll around the cylindrical surfaces of the bodies is considered. In the prelaunch position, the axes of these surfaces are parallel to each other and equidistant from the cluster rotation axis. The film winding direction is consistent with the direction of the cluster rotation so that, after the holding locks are opened, the bodies begin to move away from each other under the action of centrifugal forces, thus pulling and unwinding the film. It is assumed that the film median passes through the cluster center of mass. A pair of cords bounding an imaginary film can be used instead of the actual film as well. Some basic relations between the cluster motion parameters in the unwinding process are obtained. A scheme for describing the unwinding of clusters of any number of dynamically identical polygonshaped bodies is proposed. © Allerton Press, Inc., 2015.


Zolotarevskaya D.I.,Russian State Agricultural University
Eurasian Soil Science | Year: 2013

Theoretical investigations and field tests have revealed the tendencies of the rheological properties and density of a loamy sandy soddy-podzolic soil under the impact of a wheel tractor. The rheological properties of the soil in the viscoelastic state have been described by a differential equation of the first order relating the compressive stresses with the variation rates of the compressive stresses and the relative vertical compressive deformation. The effect of the dynamic loads at the vertical vibration of a wheel tractor has been mathematically simulated. A method has been proposed for calculating the rheological properties and the soil compaction parameters under a running tractor that considers the effect of the variations of the dynamic load on the soil. Software products have been developed to implement this method. The effect of the main factors on the rheological properties of the soil and its compaction parameters under the impact of a tractor has been quantified. © 2013 Pleiades Publishing, Ltd.


Zolotarevskaya D.I.,Russian State Agricultural University
Eurasian Soil Science | Year: 2011

The deformation and compaction of loamy sandy soddy-podzolic soils under linear dynamic changes in the compressive stresses and in the course of the soil creeping were studied in field experiments. The rheological properties of these soils occurring in the viscoelastic state were described by a first-order differential equation relating the compressive stresses, the rates of their changes, and the velocities of the relative vertical compressive deformation. Regression equations were derived for the viscoelastic properties of the studied soil as functions of its density, moisture, and linear compaction velocity. Methods were proposed for the calculation of indices of the stress-strain state and the compaction of soils under specified conditions of changes in their compressive stresses with time and in the course of the soil creeping after the initial linear increase in load. Corresponding computer programs were developed. The effect of the main factors due to the linear increase in the compressive loads and in the course of the soil creeping on the rheological properties, the stress-strain state, and the density of soils was quantitatively estimated. The calculation showed that the values of the soil deformation and the density under compressive stresses lower than the ultimate strength were stabilized with time, and the properties of the viscoelastic soil approached elastic ones. © 2011 Pleiades Publishing, Ltd.

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