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Coupled modeling of induction motor using finite element method
Gregor, Tomáš ; Huzlík, Rostislav (referee) ; Vlach, Radek (advisor)
This thesis describes complex modeling of asynchronous motor by finite element method. Complex modeling concerns to making models based on different physical principles and their connection. Models are made in Ansys program components and their connection is made in program Ansys Workbench. This thesis includes creating electromagnetic model, thermal model, mechanical model and coupled model which connect partial models.
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The use of SPE methods for determination of ultratrace concentrations of platinum metals in environmental matrices
Ježek, Stanislav ; Zlámalová Gargošová, Helena (referee) ; Gregor, Tomáš (referee) ; Komendová, Renata (advisor)
This dissertation is focused on the study of sorption techniques for the determination of platinum and palladium on modified solid sorbents and ion exchangers. The final determination was made using atomic absorption spectrometry with electrothermal atomization (ET-AAS). Six modified sorbents were selected for the sorption study. Four modified non-polar silica gels were studied and two sorbents were based on styrene divinylbenzene copolymer. Furthermore, three cation exchange resins and three anion exchange resins were studied. The sorption efficiency of platinum and palladium was studied with modified sorbents and anion exchange resins. Furthermore, the influence of interfering elements (Fe, Cu, Zn, Pb, K, Na, Ca and Mg). Another parameter for evaluating the effectiveness of sorbents is the volume of the elution mixture required for effective elution of platinum and palladium from the sorbents. Based on the results, a sorbent was selected for the preconcentration of platinum and palladium from real environmental samples from the environment. The study of the concentration of platinum and palladium in environmental components is divided into two parts. The first part compares two cities with different sizes and vehicle concentrations. It is a regional capital in the Czech Republic – Jihlava and the capital of Austria – Vienna. For soil matrix sampling, locations near frequent traffic junctions were selected. In Jihlava, the concentration of platinum ranged from 16.93 to 38.72 ng.g-1 and for palladium from 2.705 to 8.452 ng.g-1. In Vienna, the detected concentrations were higher. Platinum concentrations ranged from 39.22 ng.g-1 to 159.2 ng.g-1 and for palladium from 18.45 ng.g-1 to 98.21 ng.g-1. The second part was focused on the busiest traffic junction in the Czech Republic - the D1 highway, focusing on the section near the Švihov water reservoir, which serves as one of the main sources of drinking water for the capital of the Czech Republic - Prague. Rain retention tanks - "lapolas" - are installed in this section. A soil sample was always taken in the vicinity of these lapolas, and from the lapolas the sediment in the reservoir and settled water at the outlet from the reservoir. These rain retention tanks proved to be suitable places for monitoring pollutants from automobile traffic.
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Thermal box - educational model
Gregor, Tomáš ; Houfek, Martin (referee) ; Vlach, Radek (advisor)
This thesis describes the design and production of simple thermal system, which is used as education model for temperature regulation. This education model is called thermal box. Thermal box is controlled by integrated electronics, which is driven by computer I/O card MF 624 and program MATLAB Simulink.
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Family house
Gregor, Tomáš ; Chuchma, Lukáš (referee) ; Kalousek, Miloš (advisor)
Bachelor thesis is treated as a documentation of the construction of a family house in the village of Březůvky in site "Garage". The object will be located in a built-up area. The project will respect the requirements of territorial planning documentation. The object is part of the basement. With two residential floors above the ground. A simple saddle roof. The House is designed in the porous concrete from Ytong.
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Study on degradation processes of bioplastics
Fojt, Jakub ; Koutný, Marek (referee) ; Gregor, Tomáš (referee) ; Kučerík, Jiří (advisor)
Biodegradable bioplastics are currently developed as a more environmentally friendly replacement for conventional plastics to be used in agriculture or packaging materials. As the production of these products increases, so will the likelihood of introducing them in the environment. Biodegradable materials are expected to biodegrade rapidly, thereby they should reduce the number of microplastics in the environment. Biodegradability is currently determined by biodegradation tests, the parameters of which are defined in very general terms and often do not reflect the actual conditions under which the bioplastic will degrade in the environment. There is a lack of knowledge about the fate and impact of these particles in different ecosystems (especially in soil, where contamination is expected to be highest). Therefore, in this dissertation, we critically evaluate the ISO soil biodegradation test and extend it with a subsequent determination of bioplastic residues in soil. For this reason, an analytical method for the determination of polyhydroxybutyrate and polylactic acid microplastics based on methods used for the determination of conventional microplastics. The effect of microbioplastics on soil is also discussed, focusing on the effects that may pose problems in agriculture. The influence of microbioplastics on abiotic (soil water properties, soil structure) and biotic (soil diversity, nutrient cycling) soil properties immediately after their entry into the soil are described. The effect of biodegradation and long-term presence of microbioplastics in soil on soil organic matter, nutrient content, and soil microbial diversity (described by determining the activity of 5 key enzymes involved in carbon, nitrogen, and phosphorus cycling) are also studied. The last chapter demonstrates the potential problems that can be encountered when bioplastic products are applied in agriculture, where the growth of fungi and molds naturally occurring in the soil can be accelerated. As a result of this dissertation, a comprehensive view of bioplastics in the environment is presented, which can serve to assess the suitability of the application of current generation bioplastic products in agriculture and the possible management of bioplastic waste.
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Enterprising of Civic Associations in Czech Republic according to new Legal Regulation
Gregor, Tomáš ; Deverová, Lenka (advisor) ; Pajas, Petr (referee)
Enterprising of Civic Associations in Czech Republic according to new Legal Regulation This Thesis concerns with Enterprising of Civic Associations in Czech Republic according to new legal regulation. 1st January 2014 the New Czech Civil Code comes into operation and brings alteration that affects all most of the Non-profit organizations in Czech Republic. New legal regulation provides Civic Associations possibility to transform them into another Legal Form of organization. It provides also new opportunities for Associations' business. In the empiric part of the Thesis three following Czech Civic Associations and their business activities are introduced. Ekodomov, o. s. POHODA, o. s. - society for disabled people's normal live Pragulic, o. s. - Get to know Prague in different way! Powered by TCPDF (www.tcpdf.org)
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