Видання зареєстровані авторами шляхом самоархівування
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Item Kinetics of Nanostructuring Processes of Material Surface under Influence of Laser Radiation(MDPI, 2020) Хоменко, Олексій Віталійович; Хоменко, Алексей Витальевич; Khomenko, Oleksii Vitaliiovych; Ющенко, Ольга Володимирівна; Ющенко, Ольга Владимировна; Yushchenko, Olha Volodymyrivna; Бадалян, Анна Юріївна; Бадалян, Анна Юрьевна; Badalian, Anna YuriivnaIn this paper, further research is conducted for a synergetic model that describes the state of the material surface in the process of laser irradiation. Namely, the previously studied approach of mutually coordinated behavior of the relaxation field, concentration of relaxation zones, and field of stress is supplemented with a nonlinear term. It is shown that, using this model, we can describe the behavior of different types of systems. During the analysis, five stationary states were found which correspond to different modes of formation of relaxation areas on the surface. The regions of parameters are found at which one or another mode of the system behavior is established. Phase portraits are constructed for each mode and the kinetics of the system is described. The obtained results qualitatively coincide with the experimental data.Item Investigation of Plastic Deformation Considering Nanoscale Effects(Sumy State University, 2015) Ющенко, Ольга Володимирівна; Ющенко, Ольга Владимировна; Yushchenko, Olha Volodymyrivna; Yurko, D.S.The self-consistent theory of plastic deformation in solid was considered within the framework of the presence of the nanoscale defects ensemble. The synergetic equations describing the self-organization of nanoscale defects were analyzed. An effective potential that distinguish plastic and solid states was obtained. For the plastic deformation waves the dispersion law depending on the diffusion coefficient of the defects was considered.Item A self-assembly of nanoparticles(Sumy State University, 2014) Ющенко, Ольга Володимирівна; Ющенко, Ольга Владимировна; Yushchenko, Olha Volodymyrivna; Бадалян, Анна Юріївна; Бадалян, Анна Юрьевна; Badalian, Anna Yuriivna; Bratash, S.O.Nanotechnology achievements are often connected to material science because the design of a wide range of advanced nanostructured materials will reduce the size of the components of many devices. But nanoscience today is more interested in the formation of nanoassemblies and further coupling of them into the nanostructured materials.Item The Phenomenological Description of Plastic Flow in Solids(Hindawi Publishing Corporation, 2013) Ющенко, Ольга Володимирівна; Ющенко, Ольга Владимировна; Yushchenko, Olha Volodymyrivna; Троцькая, Дар'я Сергіївна; Троцкая, Дарья Сергеевна; Trotskaya, Daria SergeevnaIn the framework of the phenomenological scheme a self-consistent description ofthe transition fromthe solid state tothe plastic flow was presented taking into account the point defects such as interstitials and vacancies.On the basis of the system of synergistic equations the dependencies of the internal stresses and curvature of the velocity profile of the shear displacement on the order parameter as well as the stationary distribution of the concentration of vacancies were found.Item Canonical Representation of the Active Nanoparticles Kinetics(Horizon Research Publishing Corporation, 2014) Ющенко, Ольга Володимирівна; Ющенко, Ольга Владимировна; Yushchenko, Olha Volodymyrivna; Бадалян, Анна Юріївна; Бадалян, Анна Юрьевна; Badalian, Anna YuriivnaWithin the framework of the canonical Hamilton system the behavior of active nanoparticles was investigated. On the basis of the phase portraits the kinetics of the system was studied. The transformations of the nanoparticle’s internal energy into the kinetic energy of the motion and into the total mechanic energy were considered.Item Influence of the Fluctuations of the Temperature on the Quasi Equilibrium Condensation(Sumy State University, 2014) Ющенко, Ольга Володимирівна; Ющенко, Ольга Владимировна; Yushchenko, Olha Volodymyrivna; Жиленко, Тетяна Іванівна; Жиленко, Татьяна Ивановна; Zhylenko, Tetiana IvanivnaBased on the three parametric Lorenz system a model, that allows to describe in a self-consistent way the behavior of the plasma-condensate system near phase equilibrium, was developed. Considering the influence of the fluctuations of the growing surface temperature the evolution equation and the corresponding Fokker-Planck equation were obtained. The phase diagram, which determined the system parameters corresponding to the regime of the porous structure formation, was built.Item Description of Intermittent Plastic Flow(Sumy State University, 2014) Ющенко, Ольга Володимирівна; Ющенко, Ольга Владимировна; Yushchenko, Olha Volodymyrivna; Yurko, D.S.Given the nanoscale point defects a transition from the solid state of the medium to state of ordinary and intermittent plastic flow was considered. Synergetic equations describing the self-organization of the particles and the vacancies of the system.Item Kinetics of the Active Nanoparticles(Sumy State University, 2014) Ющенко, Ольга Володимирівна; Ющенко, Ольга Владимировна; Yushchenko, Olha Volodymyrivna; Badalyan, A.Yu.We examined the behavior of active nanoparticles ensemble within the framework of canonical approach, taking into account the internal energy. We applied the anharmonic representation of the Hamilton function and analyzed the kinetics of the self-assembly using the phase-plane method. We discussed the transformations of the internal energy of nanoparticle into the kinetic energy.Item The Investigation of the External Influence on the Motion Regimes of Nanoparticles(Sumy State University, 2012) Ющенко, Ольга Володимирівна; Ющенко, Ольга Владимировна; Yushchenko, Olha Volodymyrivna; Бадалян, Анна Юріївна; Бадалян, Анна Юрьевна; Badalian, Anna YuriivnaOn the basis of self-consistent Lorenz system, taking into account the dispersion of the characteristic time of the average velocity variation the motion regimes of nanoparticles were investigated within the rigid mechanism of the self-organization. The influence of the environment was taken into account by means of a stochastic source in the equation describing the evolution of the control parameter. As a result, the Fokker-Planck equation has been obtained and has been solved in the steady state, the phase diagram of the system and the dependence of the average velocity of nanoparticles have been constructed and analyzed. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34961Item Description of the Stochastic Condensation Process under Quasi-Equilibrium Conditions(Sumy State University, 2012) Ющенко, Ольга Володимирівна; Ющенко, Ольга Владимировна; Yushchenko, Olha Volodymyrivna; Жиленко, Тетяна Іванівна; Жиленко, Татьяна Ивановна; Zhylenko, Tetiana IvanivnaThe system of three differential equations describing the stochastic condensation process under quasiequilibrium equilibrium conditions is constructed taking into account the additive and multiplicative components. The phase diagram of the system states was constructed and analyzed. The domains of the existence of the condensation processes, disassembly of previously deposited material, and the complete evaporation were determined. The distribution density of the concentration of adsorbed atoms was defined. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34910