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Yayın The composition of acids in bitumen and in products from saponification of kerogen: Investigation of their role as connecting kerogen and mineral matrix(Elsevier Science BV, 2008-11-03) Razvigorova, Maria; Budinova, Temenuzhka K.; Tsyntsarski, Boyko G.; Petrova, Bilyana N.; Ekinci, Ekrem; Atakül, HüsnüIn order to obtain more information and to understand the nature of relation between organic and mineral matter in oil shales, the compositions of soluble bitumen fractions obtained by extraction from Bulgarian oil shales before and after demineralization with 10% HCl, concentrated HE and a HF/HCl mixture were investigated. The four extracts were quantitatively examined by IR and H-1 NMR spectroscopy. The investigation of isolated acidic material of the bitumen fractions showed that the fatty acids are present in bitumen fractions as free acids, esters and salts. The amount of free acids in bitumen is very small. The dominant part of bitumen acids is associated with mineral components of the oil shales as well as part of them is included in the mineral matrix, and can be separated only after deep demineralization. The kerogen of the oil shales, obtained after separation of the bitumen fractions and mineral components, was subjected to saponification in order to determine the amount of acids, bound as esters to the kerogen matrix. The major components found were n-carboxylic, alpha,omega,-di-carboxylic, and aromatic acids. The connection of kerogen with mineral components is accomplished by the participation of carboxylic and complicated ester bonds. Experimental data for the composition of bitumen acids give evidence that algae and terrestrial materials are initial sources in the formation of soluble organic matter of Bulgarian oil shale.Yayın A threefold empirical analysis of the relationship between regional income inequality and water equity using Tapio decoupling model, WPAT equation, and the local dissimilarity index: evidence from Bulgaria(Springer-Verlag GmbH, 2021-01) Taşbaşı, AslıThis study utilizes a threefold empirical analysis in order to examine the relationship between income and water equity in Bulgaria, the fastest shrinking country in the world in terms of population, and the most unequal member of the EU in terms of regional income distribution. First, in line with this goal, the income elasticity of regional water demand in the country is calculated using the Tapio decoupling model. Second, the WPAT equation which measures the weighted impacts of population, per capita income and intensity on water demand, is utilized. And finally, using the local dissimilarity index, spatial differences in access to water by region are measured. Underscoring the essence of regional level analyses based on specific decomposed subgroups, findings are thus compatible with the economic and demographic characteristics of the regions handled in the study. In the northern regions where income and population levels are relatively low, during periods when income and water demand both increase, the rise in water demand is usually higher than the increase in income; conversely, when income decreases, the water demand also falls. The effect of population dominates the changes in water demand in the northern regions, with the exception of the Northwestern Region, where water intensity is the leading factor, possibly because the Balkans’ largest nuclear power plant is located in the region. In the southern regions where income is higher, income has been the most important determinant of water demand, particularly in recent years.
