National Repository of Grey Literature 95 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Study of particles of various cosmetic pigments
Cerevatova, Kristina ; Opravil, Tomáš (referee) ; Zemanová, Jana (advisor)
The main focus areas of this master thesis include the writing of a literature review, which contains an overview and segregation of pigments which are used in the preparation of cosmetic products. The thesis is focused on the properties and characterization of pigments for use in cosmetology. The following focus is on legislation, more specifically on pigments that the cosmetic industry allows, limits and does not allow. The main part of this thesis is an overview of methods for the characterization of pigments. The practical part deals with the characterization of particles of selected cosmetic pigments by applying methods for determination of color, elemental and phase composition, particle size and morphology. The thesis is concluded by evaluation of the achieved results.
Monitoring of alkali-silica reaction
Doležal, Martin ; Kalina, Lukáš (referee) ; Opravil, Tomáš (advisor)
Due to the alkali-silica reaction (ASR), concrete structures are damaged, which can lead to the loss of their useful properties. For the reaction to take place, the presence of alkalis is required. During the work, the release of alkalis into the pore solution was monitored. During hydration pore solutions were taken, on the basis of calorimetric curves. In pore solutions the K+ a Na+ content was analyzed by ICP-OES. The result is graphs of the development of alkali content and their relationship to cement hydration. The danger of the alkali in tested samples for the course of the reaction is described here. The description of the alkali content and its development is important for understanding the course of ASR and proposing a viable solution to protect against this problem.
Monitoring of corrosion of refractory lining
Taraba, Vojtěch ; Ptáček, Petr (referee) ; Opravil, Tomáš (advisor)
This bachelor’s thesis is focused on the monitoring of corrosion of refractory lining in the cement rotary kiln, chemical and mineralogical changes of the refractory and their influence on the lining properties. Magnesia-spinel refractories located in the lower transition zone are analyzed by X-ray diffraction, X-ray fluorescence, inductively coupled plasma optical emission spectrometry and scanning electron microscopy.
Evaluation of properties of coal combustion solid residues
Cesnek, Ľuboš ; Bílek, Vlastimil (referee) ; Opravil, Tomáš (advisor)
The bachelor’s thesis focuses on condition monitoring of a stored high-temperature fly ash and its properties over time. The high-temperature fly ash comes from a dumping where it has been aggregated over several years. Samples of fly ash used for our analysis were taken from a bore-hole with a depth of 38 meters. Subsequently, detailed analyses of the fly ash from individual depth levels were performed. Furthermore, mechanical properties, volume stability and changes in weight of the prepared test beams were tested. The aim of the experiment was to evaluate suitability of using fly ash from a dumping site as a pozzolanic admixture in cement pastes.
Hybrid binders containing Portland clinker
Kratochvilová, Lucie ; Hrubý, Petr (referee) ; Opravil, Tomáš (advisor)
This bachelor thesis is focused on the use of cement kiln dust in combination with portland clinker. Cement kiln dust is a fine bulk material which is not good to mix further with cement, due to its unsuitable chemical composition. The aim of the bachelor thesis is to verify the possibilities of using this secondary material as a potential component of hybrid binders. For experimental part were taken several cement kiln dusts from different sources. The evaluation of the prepared binders was similar to Portland cement, the tests were performed according to ČSN EN 196.
Utilization of recycled brick waste for growing the agricultural plants
Šmírová, Barbora ; Másilko, Jiří (referee) ; Opravil, Tomáš (advisor)
The master thesis follows up on previous bachelor thesis, which dealt with the sorption capacity of brick recyclate. Brick recyclate, as same as brick, excel with very high porosity. For this reason this work deals with possible implementation of plant growth aids (fertilizers) on the inside surface of such highly porous material This thesis studies possibilities of preparation of brick recyclate with the content of components supporting plant growth. It is a material, that is able to bind water in the soil and nourish cultivated plants at the same time. Aim of the work is to find out, what maximum amount of supporting substances, that later will be released back into surrounding enviroment (soil), is possible to incorporate into the brick recyclate. Such prepared recyclate was added in different amounts into predefined substrates, where plants were grown. Subsequently, the growth course, germination and yields of selected crops were monitored. It was verified that the material based on recycled brick enriched with nutrients improves the distribution of nutrients in the soil and positively affects the germination, growth and yields of tested crops.
Inorganic thermal insulation material for masonry elements
Sedlačík, Martin ; Švec, Jiří (referee) ; Opravil, Tomáš (advisor)
This master’s thesis deals with preparation of foam glass and explores the possibilies of utilization of this material as an inorganic thermal insulating filler of fired hollow bricks. Foam glass was prepared via powder sintering method from waste packaging glass, using limestone and graphite as foaming agents. After inital analysis of raw materials, the effect of mixture composition and different processing parameters on bulk density, pore size and morphology of foam glass was investigated. Last but not least, different ways of manufacturing thermal insulating bricks, by preparation of foam glass directly in the cavities of fired hollow bricks, were tested.
Utilization of mica separated from washed kaolin
Vaculík, Josef ; Ptáček, Petr (referee) ; Opravil, Tomáš (advisor)
The Master’s Thesis aims to laboratory test the possibilities of utilization mica separate, which arises during the process of floating kaolin as a by-product together with sand. Mica and sand are then separated by flotation or vibration. The mica separate thus formed was subjected to analysis. XRD and heating microscopy methods were used for analysis. Subsequently, experiments with mica separation as a filler in composites based on epoxy resins were set up and performed. Furthermore, the separate was tested as a part of plasters and visual building elements. Last but not least, the separate was mixed into the ceramic, which was then subjected to firing in the selected mode. The diploma thesis provides a comprehensive overview of the above-mentioned possibilities of using mica separation, which is based on a sufficient amount of experimental data.
Enamels containing recycled brick waste
Tmejová, Jana ; Ptáček, Petr (referee) ; Opravil, Tomáš (advisor)
The diploma thesis deals with the possibilities of using recycled brick as a component in the preparation of glazes. Recycled brick is a mixture of crushed bricks, it can also contain a brick tablecloth, its composition and color makes this material practically identical to a brick shard. Due to these properties, it can be assumed that recycled brick can be used to prepare technical glazes with a specific color. The aim of the diploma thesis is to verify the possibilities of using recycled brick for the preparation of technical glazes. For prepared glazes, then evaluate their properties and estimate for which type of product these alternative glazes could be used.
Testing, routing and QoS in private networks
Opravil, Tomáš ; Holík, Martin (referee) ; Škorpil, Vladislav (advisor)
This thesis concerns the interaction of technologies of routing with ensuring the quality of services. It focuses on the function of routing protocols RIP and OSPF in combination with FIFO, PQ and WFQ queues of the technology DiffServ. The main output consists of two complex laboratory tasks. The first deals with theoretical research of the two mentioned above Riverbed programme technologies. The second subsequent task uses the emulator EVE-NG to aim the verification as well as deepening the acquired theoretical knowledge in practise.

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