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Uehara cycle
Soška, Michal ; Škorpík, Jiří (referee) ; Fiedler, Jan (advisor)
This Diploma thesis describes design of the computational model of Uehara power cycle, with ammonia-water mixture used as working fluid. First part is dedicated to issue of determination working mixture thermodynamic properties, which are essential for computational model design. The second part of this thesis describes the methodology of computing power cycle by system matrix solving method. For purposes of methodology testing, model of Kalina power cycle was also created. Computational models of Uehara and Kalina cycles are designed in Excel and are an integral part of this thesis. Text part also includes a description of their user interface, calculation algorithm and detailed description of the design methodology.
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Arsenic speciation in mining wastes - case studies in systems dominated by ferric sulfoarsenates
Jelenová, Helena ; Drahota, Petr (advisor) ; Filippi, Michal (referee) ; Jurkovič, Ľubomír (referee)
The aim of the thesis is to study behavior and mineralogy of arsenic in mine wastes with high levels of FeIII and SVI . Three methodological studies are related to (i) identification and characterization of secondary arsenic phases using a Raman spectrometry, (ii) chemical fractionation of arsenic in mine waste materials as observed by optimized sequential extraction, (ii) and investigation of thermodynamic properties of zýkaite. The mineralogy and mobility of arsenic was studied in mine waste material of five dumps located at three sites (Kaňk near Kutná Hora, Jedová jáma near Vejprty, and Dlouhá Ves) and in stalactite samples from two abandoned underground mines (Plavno and Mikulov near Teplice). Mineralogical and geochemical characterization of samples included standard methods and techniques. Chemical composition of solid and liquid (pore water, leachates) samples was performed using a XRF, ICP OES, ICP MS, etc. X-ray diffraction, Raman spectrometry and electron microscope equipped with microanalysis were the most frequent techniques used for mineralogical characterization of the solids. The results showed that the speciation of arsenic in the solid phase significantly varied among the studied sites and was a function of total concentration as well as proportion of the major components of...
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Physicochemical Characterization of Chiral Ionic Liquids for Their Applications.
Andresová, Adéla ; Bendová, Magdalena ; Wagner, Zdeněk ; Husson, P. ; Feder-Kubis, J. ; Traïkia, M.
In this work, we address a thermodynamic characterization of a homologous series of 1–[(1R, 2S, 5R)-(–)-menthoxymethyl]-3-alkylimidazolium bis{(trifluoromethyl)sulfonyl} imide ionic liquids. The alkyl chain length ranges from methyl to dodecyl. In this study, our attention is focused on the thermodynamic properties of the pure CILs, i.e. on their heat capacities, densities, viscosities, and self-diffusion coefficients of the cations. The second level is to gain a deeper understanding of the structure-property relationships. Data analysis was carried out by means of mathematical gnostics.
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Solute-Solvent Interaction in Systems of Ionic Liquids with Molecular Solvents.
Čanji, Maja
The goal of this study was to understand the interactions of ions and their interaction with molecular solvents such as water, methanol, acetone, etc. Saccharinate is a natural nontoxic anion, contributing to a relatively high viscosity of the ionic liquid. Application of highly viscous ILs can be difficult and can be overcome by mixing with some molecular solvents.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_22316070712110 - PDF
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Uehara cycle
Soška, Michal ; Škorpík, Jiří (referee) ; Fiedler, Jan (advisor)
This Diploma thesis describes design of the computational model of Uehara power cycle, with ammonia-water mixture used as working fluid. First part is dedicated to issue of determination working mixture thermodynamic properties, which are essential for computational model design. The second part of this thesis describes the methodology of computing power cycle by system matrix solving method. For purposes of methodology testing, model of Kalina power cycle was also created. Computational models of Uehara and Kalina cycles are designed in Excel and are an integral part of this thesis. Text part also includes a description of their user interface, calculation algorithm and detailed description of the design methodology.
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Dvou-strukturní model termodynamických vlastností a povrchového napětí podchlazené vody
Hrubý, Jan ; Holten, V.
A thermodynamic model was developed describing the liquid and gaseous phases of water. The model correctly represents the strong anomalous behavior of supercooled water. The anomalies are due to the vicinity of liquid-liquid critical point. The model approximates liquid water as a mixture of two competing structures (high- and low-density structure) and cavities. The thermodynamic state is found by minimizing the Gibbs free energy with respect to the proportion of the two structures and number of cavities. The mixture approach is further used to model the surface tension.
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