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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Soil classification based on soil texture measurements by standard and modern methods
 Faltínová, Klára ; Tomášová, Gabriela (referee) ; Paseka, Stanislav (advisor)
The master thesis is devoted to the problems of soil particle distribution. The particles distribution of fine particles samples are analysed by sieve method, hydrometer method, pipette method and laser diffraction method. Soil types are determined on the basis of graphs expressing the particle size distribution. The conclusion of the work is focused on the comparison of the performed methods and results, especially sedimentation and laser diffraction methods. In some cases, changes are suggested to refine the measurements statements.
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Micronization of biopolymer material
 Gistingerová, Radka ; Wikarská, Monika (referee) ; Pospíšilová, Aneta (advisor)
This bachelor thesis focuses on the preparation of poly(3-hydroxybutyrate) microparticles for cosmetic products. The particles were prepared by emulsion technology, where a chloroform solution of poly(3-hydroxybutyrate) was dispersed in an aqueous solution of polyvinyl alcohol. The original poly(3-hydroxybutyrate) was also in powder form, but it was thought that its properties could be improved by this treatment. Evaporation of all the chloroform produced poly(3-hydroxybutyrate) particles. By changing the input concentrations of the two components, the particle size distribution was altered. All prepared powders were measured using a scanning electron microscope and measured by laser diffraction. Experiments and subsequent measurements showed that increasing the concentration of the emulsifier solution leads to an overall decrease in particle size, whereas a higher concentration of poly(3-hydroxybutyrate) causes an increase in particle size. To evaluate the potential of the prepared particles in cosmetics, all powders were evaluated sensorially. The evaluators observed almost no differences between the powders, only the original poly(3-hydroxybutyrate) powder was rated slightly worse compared to our prepared powders. The powder that is currently used in cosmetic products was rated very similarly to the powders that were prepared by emulsion technology.
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