Moscow State University of Environmental Engineering

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Zasetsky A.Y.,RAS Kurnakov Institute of General and Inorganic Chemistry | Petelina S.V.,La Trobe University | Lyashchenko A.K.,RAS Kurnakov Institute of General and Inorganic Chemistry | Lileev A.S.,Moscow State University of Environmental Engineering
Journal of Chemical Physics | Year: 2010

Rotational diffusion in liquid acetonitrile, dimethylsulphoxide (DMSO), water, and methanol is studied with molecular dynamics simulations. The effects of hydrogen bonding and local dipole-dipole correlations (Kirkwood g-factor) on the relationship between the single molecule and collective relaxation are examined. The first rank single molecule dipole moment autocorrelation functions (ACFs) are constructed in the molecule-fixed coordinate frame and the principal components of rotation diffusion tensor are reported. Higher rank orientational ACFs are computed. These ACFs, as a rule, are strongly nonexponential (at least not single exponential) at longer times and the decomposition of these functions into a series of single exponentials results in broad distributions of relaxation times, with the broadening being particularly prominent in the case of higher rank ACFs. The rank dependence of characteristic times calculated as weighted averages over the relaxation time distributions does not follow the pattern of small angle (Debye) diffusion model for all liquids studied in this work except methanol. In contradiction, the same rank dependence computed by direct integration of ACFs leads to good agreement with the Debye diffusion model in the case of acetonitrile, DMSO, and water (but not methanol). The linear-angular momentum cross correlation functions are also computed and the effect of rototranslational coupling on reorientaional relaxation at longer times (≥ 1.0 ps) is found to be small. © 2010 American Institute of Physics.


Novikov V.V.,Bryansk State University | Mitroshenkov N.V.,Bryansk State University | Morozov A.V.,Moscow State University of Environmental Engineering | Matovnikov A.V.,Bryansk State University | Avdashchenko D.V.,Bryansk State University
Journal of Applied Physics | Year: 2012

Temperature dependences of heat capacity and lattice parameters of gadolinium tetraboride (GdB 4) at the temperatures of 2-300 K have been studied experimentally. In the course of the experiment, the anomalies of these properties caused by the processes of transition into the antiferromagnetic state at T N 41.87 K were revealed. Temperature changes of electronic and lattice, the magnetic contribution to GdB 4 heat capacity, as well as the Schottky contribution were singled out and analyzed. Residual entropy of the Gd 3 magnetic subsystem caused by frustration was found to be Rln3.2. Temperature variations of linear and volumetric thermal expansion coefficients were calculated. It was established that processes of magnetic ordering in GdB 4 give rise to a negative spontaneous magnetostriction and are not accompanied by the distortion of the crystalline lattice. © 2012 American Institute of Physics.


Novikov V.V.,Bryansk State University | Mitroshenkov N.V.,Bryansk State University | Morozov A.V.,Moscow State University of Environmental Engineering | Matovnikov A.V.,Bryansk State University | Avdashchenko D.V.,Bryansk State University
Journal of Thermal Analysis and Calorimetry | Year: 2013

This paper presents the results of an experimental study of the temperature dependencies of the heat capacity and the lattice parameters of terbium tetraboride (TbB4) measured in a temperature range of 2-300 K. This study reveals the anomalies of the above characteristics of TbB4 at the temperatures of the corresponding magnetic phase transitions (Neel points) T N1 = 44 K and T N2 = 24 K. The transitions of TbB 4 from the tetragonal crystalline structure into the orthorhombic one at temperatures below T N1 were identified. Within our experimental accuracy, no structural transition into the orthorhombic symmetry at temperatures above 80 K was observed. The individual temperature variations of lattice-related and magnetically induced components of the measured properties of TbB4 are extracted using the data for the diamagnetic LuB 4. As a result, separate contributions of lattice and magnetic subsystems of TbB4 are determined. © 2012 Akadémiai Kiadó, Budapest, Hungary.


Generalization of data on geometrical characteristics of various types of bulk and regular packing of columned devices for realization of heat and mass transfer processes is presented. © lietuvos mokslu{ogonek} akademija, 2011.


Waldberg A.,Moscow State University of Environmental Engineering
Journal of Environmental Engineering and Landscape Management | Year: 2010

Industrial tests of fibrous filters have shown that, above mist drop collecting, they are effective means for adsorption of gaseous impurities. Considering it, there were made tests that enabled reaching quantitative results on DE2 absorption by aqueous solution of sodium. Tests were made on experimental plant using apparatus with fibrous nozzle as its main element. Absorber studies were made in the laboratory of engineering ecology of municipal services at Moscow State University of Environmental Engineering (MSUEE). Experimental plant is automated: controlling and regulation of regime parameters of the absorber are made using the monitor of a personal computer.


Pokusaev B.G.,Moscow State University of Environmental Engineering | Nekrasov D.A.,Moscow State University of Environmental Engineering | Tairov E.A.,Russian Academy of Sciences
High Temperature | Year: 2012

Results of experimental investigation and mathematical modeling of boiling of subcooled water and ethanol under pulsed heat generation in a heater wall are presented. The defining steps of boiling, i.e., warming-up of the wall area, development of the vapor phase, and formation of the pressure wave, are considered. Beginning from some values of surface warming rates (∼3000 K/s) and underheating (∼20 K), the mechanisms of boiling of water and alcohol are demonstrated to be different. © 2012 Pleiades Publishing, Ltd.


Polyanin A.D.,Russian Academy of Sciences | Vyaz'Min A.V.,Moscow State University of Environmental Engineering
Doklady Physics | Year: 2012

An exact method for constructing solutions of a wide class of linear three dimensional steady and unsteady hydrodynamic type systems, which describe slow motions for various models of an incompressible fluid, is described. The method is based on division of these systems into several simpler equations. The formulas that make it possible to express the general solution of these systems through the solutions of two independent equations are derived. It is shown that the described method is also applicable for integration of certain nonlinear hydrodynamic type systems. The described method and derived formulas are also applicable for integration of certain model nonlinear hydrodynamic type systems. Similar integrable nonlinear systems can be used for testing the numerical methods of solving the hydrodynamic equations.


Sarkisov P.D.,Mendeleev University of Chemical Technology | Butusov O.B.,Moscow State University of Environmental Engineering | Meshalkin V.P.,Mendeleev University of Chemical Technology
Theoretical Foundations of Chemical Engineering | Year: 2011

An analysis of present-day computer-aided tools for molecular systems engineering and the possibility of their use for developing the texture of new nanomaterials is performed. A wavelet-morphometric algorithm for a computer-aided analysis of the texture of nanomaterials using the original photomicrographs is proposed that includes the following main stages: the decomposition of the original photomicrographs into low-frequency and high-frequency components using a discrete wavelet transform, the calculation of energymechanical characteristics for the identified images of the texture elements of the high-frequency component, and further binary decomposition and calculation of morphometric parameters for the created images of energy-mechanical characteristics (parameters of texture elements). A system of energy-mechanical and morphometric parameters of the elements of the texture of nanocomposites is proposed that is based on the use of binary decomposition filtration of textural photomicrographs and the morphometric parameters of the identified images of clusters in the binarization sections. © 2011 Pleiades Publishing, Ltd.


Suris A.L.,Moscow State University of Environmental Engineering
Theoretical Foundations of Chemical Engineering | Year: 2011

A formula for calculating the low heating value of halogen-containing condensed materials from their elemental composition is reported and the applicability of this formula to the determination of the theoretical combustion temperature is considered. For determination of the theoretical combustion temperature of halogen-containing organics, it is necessary to know the possible degree of dissociation and the heat of dissociation of the hydrogen halide HX. A thermodynamic analysis of the equilibrium compositions resulting from the dissociation of HX and from the interaction of HX with oxygen and other compounds that can be present in the system during the oxidation of substances containing various chemical elements is carried out. The data demonstrate that there can be a high SiF4 concentration at some temperatures and reactant ratios.


Pushnov A.,Moscow State University of Environmental Engineering | Berengarten M.,Moscow State University of Environmental Engineering
Journal of Environmental Engineering and Landscape Management | Year: 2011

Authors are analyzing ecological and resource aspects of large-scale chemistry, petrochemistry and power engineering enterprises industrial cooling towers exploitation. Basing on hierarchical approach, the air flow in scales or region, plant and separate shop was examined. Currents of aerial masses at the plant territory are analyzed at presence of one or several sources of harmful gas pressure bumps in atmosphere conditions of interplay of these pressure bumps with steam-air plumes of groups of cooling towers. There are executed the results calculation of bordering zones with increasing of maximum permissible concentrations. The calculations are based on a data of concrete energy object including one or two sources of emission and under condition of one of the sources interaction with a group of cooling towers placed near. There are substantiated the suggestions to organize international ecological monitoring in Baltic region countries. © 2011 Vilnius Gediminas Technical University (VGTU) Press Technika.

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