58 research outputs found

    Actual aspects of organic agricultural development in Ukraine

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    The monograph presents a conceptual analysis of the development of all sectors of organic production in Ukraine, the problems of sustainable increase in the efficiency of agrobiocenoses, the economic aspects of the formation of organic production according to European standards, and the analysis of opportunities for the agrarian sector. The approaches to the application of new methods and tools in organic production are described. The monograph is prezented for specialists, employments of the agrarian sector, scientists, professors, students and masters, all those who are interested in the specified range of questions that are being analyzed

    Isotherm and heat of adsorption in porous solids with defective pores-adsorption of argon and nitrogen at 77K in Saran activated carbon

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    The isotherm and isosteric heat of a porous solid are studied in terms of the local isotherms and isosteric heats of individual pores with defective walls, rather than graphitic walls as commonly assumed in the literature. We point out the incorrect formulas that have been used in the literature, and present a correct formula to calculate the isosteric heat for a porous solid. The correct formula is illustrated with a direct Monte Carlo ( MC) simulation of systems of two pores of different sizes, and finally we apply our theory to experimental data of argon and nitrogen adsorption at 77K on S600H and S84 Saran charcoals to derive their pore size distributions ( PSD). We show that the PSD derived from the fitting either the isotherm only or the heat curve only may not be reliable. It is necessary to utilize both the isotherm and heat curves in the derivation of a more reliable PSD. We also show that it is essential to use defected walls of carbon pores to model adsorption in pores as the model using graphitic walls can not describe isotherm and heat of adsorption adequately

    Two methods of describing adsorption equilibrium

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