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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. Source


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. Source


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. Source


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. Source


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. Source

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