Arkhangelsk State Technical University

Arkhangel’sk, Russia

Arkhangelsk State Technical University

Arkhangel’sk, Russia

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Rogov V.A.,International University in Moscow | Fomin E.V.,Arkhangelsk State Technical University | Fomin A.V.,SEVMAShVTUZ
Russian Engineering Research | Year: 2010

The influence of the cutting conditions on cutting-tool life is investigated in the machining of 10 low-temperature steel. Multifactorial models of cutting-tool life are derived. The REZMET system for automated calculation of optimal cutting conditions is developed. © 2010 Allerton Press, Inc.


Kuntysh V.B.,Belarusian State Technological University | Samorodov A.V.,ArkhangelSk State Technical University
Journal of Engineering Physics and Thermophysics | Year: 2010

Results of experimental investigations of the average heat transfer from five-row staggered bundles of tubes with knurled spiral fins, operating in the free air-convection regime, in the case where the angel of inclination of the longitudinal axis of the tubes changed from 0 to 60° are presented. The investigations were carried out by the method of complete heat simulation. The average heat transfer was measured in the direction of a free air flow in each row of a tube bundle. The experimental data were generalized by similarity equations for calculating the average heat transfer from the tube bundles and their individual rows in the range of change in the Rayleigh number characteristic of the operating conditions of industrial heat exchangers assembled from finned tubes of the type of the above-indicated tubes. © 2010 Springer Science+Business Media, Inc.


Popov V.N.,Arkhangelsk State Technical University | Testova I.V.,Arkhangelsk State Technical University | Yushkanov A.A.,Arkhangelsk State Technical University
Technical Physics | Year: 2011

An analytic (in the form of a Neuman series) solution to the problem of the Couette flow in a plane channel with infinitely large parallel walls is constructed using the kinetic approach in the isothermal approximation. For the basic equation, the Bhatnagar-Gross-Krook (BGK) model of the kinetic Boltzmann equation is used, while the boundary condition is determined by the diffuse reflection model. The mass flux through half the channel thickness in the direction parallel to the channel walls as well as the nonzero component of the viscous stress tensor are calculated taking into account the constructed distribution function. The results are compared with analogous data obtained by numerical methods. © 2011 Pleiades Publishing, Ltd.


Byr'ka A.A.,First Testing Cosmodrome Plesetsk | Bogolitsyn K.G.,ArkhangelSk State Technical University | Kosyakov D.S.,ArkhangelSk State Technical University | Shpigun O.A.,Moscow State University
Inorganic Materials | Year: 2010

The influence of the launch of carrier rockets of different classes on chemical composition of the air in the working zone of the Plesetsk Cosmodrome is studied by ion chromatography, spectrophotometry, and gas analysis. On the basis of analysis of data obtained, the efficiency of methods used and the locality and short-term duration of atmospheric pollution by toxic components of rocket propellants in the region of the launch complex at the cosmodrome are deduced. © 2010 Pleiades Publishing, Ltd.


Povarnitsyna T.V.,ArkhangelSk State Technical University | Popova N.R.,ArkhangelSk State Technical University | Bogolitsyn K.G.,ArkhangelSk State Technical University | Beloglazova A.L.,ArkhangelSk State Technical University | And 2 more authors.
Russian Journal of Physical Chemistry A | Year: 2010

The kinetics of catalytic oxidation for ferulic acid with polyoxometalates used as catalysts was studied. The effect of pH and concentrations of the principal reacting components on the process kinetics was studied. A kinetic scheme of oxidation is proposed, and the values of a number of kinetic parameters of the process are determined. © 2010 Pleiades Publishing, Ltd.


Popov V.N.,Arkhangelsk State Technical University | Testova I.V.,Pomor State University | Yushkanov A.A.,Moscow State Regional University
Journal of Applied Mechanics and Technical Physics | Year: 2012

An analytical solution (in the form of a Neumann series) of the problem of rarefied gas flow in a plane channel with infinite walls in the presence of a pressure gradient (Poiseuille flow) parallel to them is constructed within the framework of the kinetic approach in an isothermal approximation. The ellipsoidal-statistical model of the Boltzmann kinetic equation and the diffuse reflection model are used as the basic equation and the boundary condition, respectively. Using the resulting distribution function, the mass and heat flux densities in the direction of the pressure gradient per unit channel length in the y′ direction are calculated, and profiles of the gas mass velocity and heat flux in the channel are constructed. The results obtained for the continuum and free-molecular flow models are analyzed and compared with similar results obtained by numerical methods. © 2012 Pleiades Publishing, Ltd.


Ivahnov A.D.,Arkhangelsk State Technical University | Bogolitsyn K.G.,Arkhangelsk State Technical University | Skrebets T.E.,Arkhangelsk State Technical University
Russian Journal of Physical Chemistry B | Year: 2010

The influence of pressure on the parameters of low-temperature oxidative delignification of firry wood in supercritical carbon dioxide under the action of hydrogen peroxide is described. The chemical composition of the cellulose half-finished products is characterized.


Ivahnov A.D.,Arkhangelsk State Technical University | Bogolitsyn K.G.,Arkhangelsk State Technical University | Skrebets T.E.,Arkhangelsk State Technical University
Russian Journal of Physical Chemistry B | Year: 2010

Changes in the content of lignin functional groups during low-temperature delignification under the action of hydrogen peroxide in supercritical (SC) CO2 in the preparation of fibrous cellulose half-finished product were considered. The action of the oxidizer caused changes in the molecular weight characteristics of lignins. The experimental data showed the occurrence of both oxidation and substitution processes. Oxidation in SC CO2 resulted in the formation of water- and alkali-soluble medium- and low-oxidized lignins because of decreased oxidizer consumption. © Pleiades Publishing, Ltd., 2010.


Skrebets T.E.,Arkhangelsk State Technical University | Bogolitsin K.G.,Arkhangelsk State Technical University
Russian Journal of Bioorganic Chemistry | Year: 2010

The hydrodynamic behavior of lignin in a dimethylsulfoxide-water mixture have been studied at the temperature range of 20-60°C and at a water content from 0 to 30%. The rise of temperature was shown to deteriorate the quality of the solvent; i.e., the system under investigation belongs to systems with a lower critical solution temperature. The dimension of lignin particles in the mixed solvent decreases with an increasing proportion of water in the system. © 2010 Pleiades Publishing, Ltd.


Belyi V.A.,RAS Institute of Chemistry | Kocheva L.S.,RAS Institute of Chemistry | Karmanov A.P.,RAS Institute of Chemistry | Bogolitsyn K.G.,Arkhangelsk State Technical University
Russian Journal of Bioorganic Chemistry | Year: 2010

The acid-base properties of dioxane lignins from the roseroot stonecrop (Rhodiola rosea L.) and the saw-wort (Serratula coronata L.) have been studied by spectrophotometrically determining the ionization constants for phenol hydroxyl groups. A correlation between the molecular masses of the fractions of lignins and their acid-base properties has been established. © 2010 Pleiades Publishing, Ltd.

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