Перегляд за Автор "Kutarov, Volodymyr V."

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  • Ескіз
    Документ
    Adsorption Hysteresis in Open Slit-like Micropores
    (2021) Drahan, Hryhorii S.; Kutarov, Volodymyr V.; Schieferstein, Eva; Iorgov, Alexander; Драган, Григорій Сильвестрович; Драган, Григорий Сильвестрович; Кутаров, Володимир Володимирович; Кутаров, Владимир Владимирович
    Adsorption hysteresis in the low-pressure range is only rarely described in the literature. To optimise, for example, heat storage technologies, a deeper understanding of the low-pressure hysteresis (LPH) process is necessary. Here, two thermodynamically based approaches are further developed for analysing the LPH within the framework of thermodynamically irreversible processes and fractal geometry. With both methods developed, it is possible to obtain the description of the adsorption and desorption branches with high accuracy. Within the framework of the two thermodynamic models of the hysteresis loop, generalised equations are obtained with the control parameter in the form of the degree of irreversibility. This is done by taking the adsorption of water on alumina as an example. It is shown that the fractal dimension of the adsorption process is larger than the fractal dimension of the desorption branch, meaning that the phase state of the adsorbate is more symmetric during the adsorption step than in the desorption process.
  • Ескіз
    Документ
    The Methanol Adsorption in Microporous Alumina Agglomerates
    (2019) Drahan, Hryhorii S; Драган, Григорій Сильвестрович; Драган, Григорий Сильвестрович; Kutarov, Volodymyr V.; Кутаров, Володимир Володимирович; Кутаров, Владимир Владимирович; Poletaev, Nikolai I.; Полетаєв, Микола Іванович; Полетаев, Николай Иванович; Kolesnykov, Kyrylo; Khlebnikova, Mariya
    We have studied theoretical and experimental methods of methanol adsorption in micropores of aluminum oxide agglomerates obtained by gas-dispersion synthesis. It is shown that the necessity to use strict equations based on the theory of volume filling of micropores, which implies a physical and formal analogy between the volume filling of micropores and capillary condensation, for qualitative and quantitative description of adsorption equilibrium in open slit-like micropores. The applicability of the proposed equations for the description of adsorption equilibrium in such systems is demonstrated on the example of experimental methanol adsorption/desorption isotherm on the aluminum oxide, which possesses a microporous structure.
  • Ескіз
    Документ
    Universal description of the biofilms growth dynamic in logistic model
    (Одеський національний університет імені І. І. Мечникова, 2018) Huiyu, Zhou; Drahan, Hryhorii S.; Kutarov, Volodymyr V.; Galkin, Mykola B. ; Filipova, Tetiana O.; Хуюі, Джоу; Драган, Григорій Сильвестрович; Кутаров, Володимир Володимирович; Галкін, Микола Борисович; Філіпова, Тетяна Олегівна; Хуюи, Джоу; Драган, Григорий Сильвестрович; Кутаров, Владимир Владимирович; Галкин, Николай Борисович; Филиппова, Татьяна Олеговна
    We study experimental and theoretical dependences of growth dynamics of Pseudomonas aeruginsa biofilms and dynamics of yeast biomass growth. It is revealed that the process of growth of yeast biomass passes into the state of tmax three times faster than the formation of biofilm. Analysis of experimental data showed that the biofilm had been continuously growing in the first three days. After the third day, the accumulation of biomass in the biofilm stopped and for the next four days of biofilm observation it remained constant, which indicates competitive mechanisms of interaction. As can be seen, the population is stable at the second stage. Basic growth regimes of proximity with different dynamic characteristics are shown. The universal description of the biofilms growth dynamic was obtained. Defined parameter of the biological population growth generalized dynamics t* uniquely characterized by N* determining parameter and control parameters α and β. The parameter α is determined by the ratio between the radius of individual activity of the population and the characteristic size of the area. The parameter β is determined by competitive interactions, properties of the environment and by cell-to-cell communication. The universal model was proved for Pseudomonas aeruginsa biofilm. The results of the experiments are consistent with the calculated data.
  • Ескіз
    Документ
    Температурный профиль сферического объема плазмы с учетом рекомбинационных процессов
    (Одеський національний університет імені І. І. Мечникова, 2018) Драган, Григорий Сильвестрович; Колесников, К. В.; Кутаров, Владимир Владимирович; Драган, Григорій Сильвестрович; Колесніков, К. В.; Кутаров, Володимир Володимирович; Drahan, Hryhorii S.; Kolesnikov, K. V.; Kutarov, Volodymyr V.
    Разработана физико-математическая модель теплового баланса открытой плазменной среды с центральным источником при наличии отрицательного градиента температуры и с учетом ионизационно-рекомбинационных процессов. Скорость ионизации рассчитывалась по формуле Дравина на основе приближения Бете-Борна, скорость рекомбинации описывается обобщенной теорией Томпсона. Показано, что отрицательный градиент температуры приводит к нарушению равновесия ионизационно-рекомбинационных процессов, в результате чего тепловыделение за счет рекомбинации преобладает по отношению к теплопотерям за счет ионизации, что существенно влияет на температурные профили. Проведены расчеты профилей температуры с учетом ионизации и рекомбинации железа при различных параметрах среды.