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Kurbatov V.G.,Yaroslavl State Technical University | Indeikin E.A.,Yaroslavl State Technical University
Protection of Metals and Physical Chemistry of Surfaces | Year: 2017

It has been determined that a dopant acid affects the dispersion composition of the prepared coreshell pigments. Anticorrosion properties of the pigments with the polyaniline (PAN) shell have been investigated. Pigments with a PAN shell doped by phosphoric acid possess the highest anticorrosion properties. The dependence of the electrical conductivity on the substrate-to-PAN ratio has been determined. Anticorrosion properties of polymer coatings containing the pigments with PAN shell have been studied. © 2017, Pleiades Publishing, Ltd.


Zalutskii A.A.,Yaroslavl State Technical University
Journal of Surface Investigation | Year: 2014

Experimental results on studying charge exchange in iron ions in systems of reduced dimensionality (nanoclays) of natural origin is presented. The conditions for the observation and the effect of different external factors on the reversible transition of the valence change for iron ions (Fe3+⇄Fe2+) in typical representatives of clays is established using Mössbauer spectroscopy. A technique of the determination of the location of iron complexes on the aluminosilicate surface of clays for Earth group planets is developed. © Pleiades Publishing, Ltd., 2014.


Zalutski A.A.,Yaroslavl State Technical University
Protection of Metals and Physical Chemistry of Surfaces | Year: 2016

Using a technique that is developed using Mössbauer spectroscopy, parameters of the diffusion motion and data on geography of the exchangeable iron complexes on a silica–alumina surface of clays were presented. The analyzed natural causes of the temperature behavior of the dynamic Mössbauer parameters allowed the pattern of the atoms' motion to be determined on the basis of various models of diffusion motion. For iron atoms adsorbed in the interwrapper space of the mineral, a jumplike translational diffusion is typical, which allowed determination of the sizes of the fluctuation hollow (r ~ 0.16 nm) necessary for the diffusion of atoms. A nonisotropic character of the diffusion for the interlayer and surface iron atoms caused by structural anisotropy of a clay substrate and by the structure of the iron complexes themselves was found. The surface diffusion of iron dimers occurs in a bounded area (L ~ 0.25 nm) and is rotational. © 2016, Pleiades Publishing, Ltd.


Simakov N.N.,Yaroslavl State Technical University
Technical Physics | Year: 2011

The effect of the incoming flow geometry on the hydrodynamic drag of a body is investigated in a numerical experiment simulating a free gas flow past a sphere as well as flows in cylindrical tubes of various radii, in a confuser, and a diffuser. The results of calculations lead to the conclusion that the confinement of the flow by the tube walls, its contraction and expansion may change the hydrodynamic force and the drag acting on the body insignificantly (not more than by 30%). This cannot explain the early drag crisis, in which the values of these quantities decrease by 4-7 times for Reynolds numbers on the order of 100. This phenomenon is explained theoretically by the effect of strong turbulence of the incoming flow to the body. © 2011 Pleiades Publishing, Ltd.


Ivanov P.A.,Yaroslavl State Technical University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

There are presented results of scaled image recognition modeling with the help of optical correlator with invariant correlation filters like MACE, GMACE, MINACE and DCCF. The image database for testing include images of true and false classes. There are presented qualitative and quantitative characteristics of output correlation peaks. Also there is provided an analysis of positive and negative side of each filter's type as for single class only scaled images recognition so for multiclass one. Also there are shown results for modeling of images with more complex distortions recognition using all mentioned types of filters. © 2014 Copyright SPIE.


Poroyko T.A.,Yaroslavl State Technical University | Skurygin E.F.,Yaroslavl State Technical University
Journal of Physics: Conference Series | Year: 2014

The non-steady-state process of a gas absorption by initially motionless liquid is investigated. Nonlinear analysis of the thermo-capillary instability showed that the transition of the process to unstable convective regime is determined by two sharply different characteristic times. First one is the time of neutral perturbations, when the fluctuations of the concentration of absorbable substance, temperature and the liquid velocity stop decrease and begin to grow together, but their intensity is too small to influence on the absorption rate. The second one is the time much greater than the first, when the perturbations reach sufficient values, and the absorption process turns to the convective regime. The results obtained explain the well-known experimental data on delaying of the transition of the absorption process to the unstable convective regime.


Ivanov P.A.,Yaroslavl State Technical University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

The paper presents the results of computer modeling of scaled images recognition using MACE, GMACE and MINACE invariant correlation filters. There is given data about testing of above mentioned filters on database of grayscale images with different resolution that contains only true class and both true class and false class objects. There presented data about output correlation peak qualitative and quantitative characteristics and about the comparison for different filter types. The filters were synthesized specially for case of such geometrical transform as change of scale. Also there is presented data about testing of mentioned filters for recognition of rotated images and given an analysis of results. © 2013 SPIE.


Ivanov P.A.,Yaroslavl State Technical University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

The presented paper deals to PC modeling of scaled and rotated images recognition based on different types of distortion invariant correlation filters. There was used a database of different images (both false and true class) that are under geometrical distortions and there were calculated correlation outputs for images recognition with the help of MACE, MINACE, GMACE, DCCF and polynomial filters and it's combinations for two-stage recognition. The results provide a possibility for successful usage of implemented algorithms. © 2016 SPIE.


Kostyuchenko M.V.,Yaroslavl State Technical University
Solid State Phenomena | Year: 2015

The technique of finite difference equations is used for analytical investigation of magnetization pattern in magnetic multilayers. The magnetic multilayers with equal magnetic layers and ferrimagnetic multilayers are considered. Heisenberg and biquadratic exchange interactions and uniaxial anisotropy are taken into account. The analytical dependencies of total magnetic moment on external magnetic field are obtained taking into account the strong interaction with the substrate. The significant difference in the behavior of magnetic moment is derived for ferrimagnetic multilayers with odd and even layers number. © (2015) Trans Tech Publications, Switzerland.


Ivanov P.A.,Yaroslavl State Technical University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

The presented paper is of PC modeling of scaled object recognition with the help of invariant correlation filters for optical correlators. The object database consists of objects of true and false classes with different changes of scale. The recognition process consits of two stages-multiclass recognition and geometrical change recognition with the help of filters of different types. The results of modeling present data on comparison of different combination of filter types. © 2015 SPIE.

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