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Optimalization of MEA structure for low temperature fuel cells
Chladil, Ladislav ; Novák, Vítězslav (referee) ; Barath, Peter (advisor)
This master’s thesis focuses on optimization of electrode configuration in combination with a polymer membrane (MEA - Membrane Electrode Assembly) in terms of material and technology. The main goal was to create a functional measurement of MEA structures with three different types of carbon materials. The theoretical part focuses on the physical and chemical properties of low-temperature fuel cells with polymer membrane. The experimental section describes the manufacture of catalytic materials with different types of carbon and various contents platinum. Produced by electrode materials were investigated by cyclic voltammetry. The next step was to manufacture MEA structures and characteristics of VA measurement using a digitally controlled load in the experimental fuel cell Quintech.
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High speed mobile access using "Femtocell" solution
Novák, Vladimír ; Molnár, Karol (referee) ; Novotný, Vít (advisor)
This bachelor thesis describes principle of mobile networks, their generation and evolution. The infomation about data transfer and third ganeration of mobile system are written in detail because they are in tight context with main submission of the thesis. Next, the historical and technical information about Femtocells technologie (especially implementation, architecture, solving of providers) are mentioned. In practical part of the thesis the solving of Femtocells technologie for 100 family houses nearby bigger city is realized. Economic confrontation macrocells network with Femtocells component network is described. Calculation of Femtocells cost savings is done.
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Low temperature Fuel Cells
Kazda, Tomáš ; Novák, Vítězslav (referee) ; Barath, Peter (advisor)
The Bachelor’s thesis is aimed at the low-temperature fuel cells and their usage in cars and mobile applications. In the theory part of this project is described the evolution of the fuel cells in last years and historically as well. Further there are described their functions and particular kinds of the fuel cells with aim at low-temperature cells. In the practical part of this thesis we were making different kinds of carbon mixtures. We have been doing measurements of mixtures on rotate disk electrode and in the experimental fuel cell. At the end of the work are experimentally evaluated different types of carbon materials with different contents of platinum depositing. The results are evaluated using electro analytical methods, using this evaluation to optimize the composition of the material used as electrode material in fuel cells.
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Comparation of the properties of the perovskit photovoltaic cells
Mudroch, Michal ; Kazelle, Jiří (referee) ; Novák, Vítězslav (advisor)
In this bachelor’s thesis it is introduced production technology and conversion of electromagnetic radiation into electric energy employing perovskites. In this paper are also described known types of perovskite photovoltaic cell structures and materials that are used to produce them. Furthermore, the theoretical part describes properties of perovskite photovoltaic cells, measured electric quantities and methods of measurement such as photospectroscopy photoimpedance spectroscopy and impedance spectroscopy that are also used to analyze cells functionality. In the following practical part is described fabrication of perovskite cells and evaluation of measured results of the perovskite cell.
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Production of a rotating vessel
Novák, Václav ; Žák, Ladislav (referee) ; Císařová, Michaela (advisor)
The thesis is concerned with the concept of an rotating vessel, that is a part of cotton candy machine. A drawing is cylindrical shape with circular a hole in the bottom, which is made of austenitic chrome-nickel steel 1.4301 with the thickness 1,5 mm. Due to the production volume 50 000 units per year, the pulling technology without wall thinning was choosen. The process of drawing will be performer in one operation. Due to calculated force, the ZHS 400 hydraulic press with a nominal force of 4 000 kN was chosen.
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Characterization of the perovskit photovoltaic cells
Kaliyev, Alexey ; Jandová, Kristýna (referee) ; Novák, Vítězslav (advisor)
The work is focused on problems of perovskite photovoltaic cells. The theoretical part describes the properties of perovskite structure, its composition and use in solar cells. There is also a brief information on silicon-based solar cells, which is followed by a comparison of the two systems. The measurement methods, which this stated and described here are used to understand problematics photovoltaic, determination of efficiency, stability and durability of the solar cell. In the practical part will focus on the application of these methods, discussion and evaluation of results.
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Kuřim south bypass - location study
Sobková, Tereza ; Novák, Vlastislav (referee) ; Radimský, Michal (advisor)
This diploma thesis deals with the solution of the southern bypass of the town of Kuřim, especially its connection to the road I / 43. The main goal was to optimize intersections and tracing affected communications. The work was based on previously prepared studies, from which were taken over the routes of the road I / 43 and the southern bypass of Kuřim.The proposal slightly modified the height and directional solution of the taken routes. Route road I / 43 is designed to affect the inhabitants of Moravské Knínice. Part of the work are also the designs of relocations of adjacent roads and new solutions resulting intersections. The proposal was prepared with regard to the Principles of Territorial Development of the South Moravian Region.
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