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New types of membranes for electrolyzer hydrogen - oxygen
Hýbl, Jiří ; Sedlaříková, Marie (referee) ; Kunovjánek, Miroslav (advisor)
This work deals with the production of hydrogen and oxygen by electrolysis. Aims of this thesis are to measure different types of membranes and choose the best for use in elektrolyzer for hydrogen and oxygen production. Properties of membranes were tested in the laboratory electrolyzer in the short and long operation. The emerging gases from elektrolyzer were also tested on a gas chromatograph to determine the purity of produced hydrogen. At the same time are also tested different concentrations of KOH elektrolyte and the effect of concentrations on efficiency of electrolyzer.
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Electrolyzer for hydrogen production
Kunovjánek, Miroslav ; Knotek, Tomáš (referee) ; Sedlaříková, Marie (advisor)
The work is concerned with a production of hydrogen and oxygen through by the help of electrolytic process in a device called electrolyzer. The basis of the work is assurance of the best efficiency of this process by testing a variety of materials and surfaces of electrodes, and testing different types of alkalic electrolytes.
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Model of Bulk Energy Accumulation
Radil, Lukáš ; Barath, Peter (referee) ; Gregor, Jan (advisor)
The purpose of this pursuit is to introduce the reader about the questions of the accumulation of the electric energy and to outline possibilities of its design and what instruments is possible to get it. The other purpose is to inscribe possibilities of today´s attachment of dispersive sources to the net from the sight of the ERU, eventually from the sight of the UCTE. This persuit describes the posibility of the accumulation of adequate dimensions from renewable resources, the modern trends in this area and the prediction of future progress. The two most proper types of the energy accumulation are chosen by the following process with regarding to the optimal resolution of the given questions. The general balance will be ana-lysed by the comparison of their basic parameters. The other point of this pursuit is to try to realize a small model of the accumulation through the hydrogen´s cycle, it comes to that we can develop the efficiency and influence by the help of the electrolyzer and the metalhydride reservoir is realized energy of accumulation . In the conclusion of this pursuit is the appreciation of the whole project with the view of partly economical and especially with the view of the prospective usage into the electric grid
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Barrier properties of varnishes for protection of photographs
Lokotschová, Radka ; Čeppan, Michal (referee) ; Veselý, Michal (advisor)
In this diploma thesis the basic principles of inkjet print, ink composition, print media and degradation mechanisms of ink dyes are summarized. The thesis deals with study of varnish barrier properties in coloured inkjet prints. Permeability of water vapour and oxygen (parts of atmosphere) depending on different coatings are tested there. In addition the influence of ozone on degradation of dyes was studied, while ozone was permeating through barrier varnish layer of inkjet print. Ozone plays an important role in degradation processes of the inkjet prints and it also causes a gas-fading. Concentrations of acting ozone were established by iodometric titration. Simultaneously kinetics of degradation of Orange 7 was studied on indicator papers.
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Study of plasma species by mass spectroscopy
Bureš, Michal ; Čáslavský, Josef (referee) ; Čech, Vladimír (advisor)
Plasma polymer films of tetravinylsilane and mixture of tetravinylsilane and oxygen gas were deposited on silicon wafers. Oxygen gas was mixed in tetravinylsilane to improve the compatibility of thin films on glass substrates. Mass spectroscopy was employed during the cleaning of the deposition chamber to check residual gases and process gases, during plasma deposition to monitor neutral plasma species and to follow plasma stability.
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Fuel cells
Ralbovský, Peter ; Škvařil, Jan (referee) ; Chroboczek, Libor (advisor)
This bachalor’s thesis deals with a fuel cells technology, their principle and division. There’s also describes how to obtain hydrogen from natural gas as fuel. Furthermore, there are advantages and disadvantages of fuel cells. At the end of the work there are applications of fuel cells and their use in cogeneration and trigeneration.
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Aircraft air-conditioning systems
Lednický, Ondřej ; Horák, Marek (referee) ; Třetina, Karel (advisor)
The bachelor thesis is focused on the aircraft air-conditioning systems, their functions and basic tasks needed for a safe and comfortable flight. The thesis is divided into several chapters: the first one deals with the most important factors influencing human health. Next chapter is focused on a description of the assurance of main components which are composing the aircraft air-conditioning system. Final chapter of the thesis deals with oxygen systems, which are essential for the survivor of the passengers in the case of an accident.
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Způsoby a metody zpomalování zralosti jablek
Majorová, Anežka
Three cultivars of apple (Idared, Prima, Golida) were harvested in three stages of ri-peness (unripe, ripe, overripe) that were stored for 30 days in two different temperatures (2 °C a 20 °C). On all cultivars, the ripeness was studied during the storing based on objective measurements. The performed measurements enabled to determine 3 basic criteria (penetration stress, soluble solids, acid-based titration). From the stored cultivars, Prima was ripe in the time of measurement, cultivars Idared and Golida reached similar in descibed parameters that are stated by the average and standard deviation. The aim of this work was to find optimal ripeness of apples, especially for long-term storage. Knowing of materiál composition during the harvest was important for studying of ripeness. The changes and values are observed and recorded. According to these values, the conditions for every cultivar for long-term storage and maintenance of apples at optimum ripeness are determined.
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Význam a využiie kyslíka vo vinárstve
Jakubec, Martin
The aim of my Bachelor degree work is to point out to oxygen as a part of daily life of us -- humans, wine and to the various aspects of oxygen effects during various winemaking processes. In the process of fermentation at white wines and in the process of maturing at red wines. The oxygen has got important role in negative wine oxydation, which the wine maker strives to restrain. Further, it is good to know how to prevent negative oxygen effects and how to make use of possitive attributes of oxydation. The methods of oxygen determination in wine have been mentioned too, though they are not use in practise. On the other hand, oxygen is necessary during winemaking process of oxidative types of wines such as Tokay selections, Port wine and sherry.
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Vliv typu zátky na prostupnost kyslíku
Pekař, Pavel
The diploma thesis aims to track the transport of oxygen into bottles with different closures after a certain time period and to evaluate statistically gained data. The introductory part of this thesis describes single types of wine stoppers, including their production and costs. In this context compares the thesis advantages and disadvantages of the single stopper types. For the experimental part of the thesis were repeatedly done chemical analyses and sensory evaluation of single samples of wines closed in bottles with different types of closures, namely natural cork stopper, natural cork stopper 2+2 ("doublespot"), cork stopper made from micro granulate, synthetic extruded stopper, synthetic co-extruded stopper ("select 100"), synthetic co-extruded stopper ("select 700"), screw closer impermeable as well as permeable, and glass closer VINO-LOK. For the experiment were used wines of the year 2012, namely Pinot Gris Kabinet and Cabernet Moravia, late harvest, semi-sweet. By the repeated analytic measuring were set the values of the pH values, the content of all titratable acids, the content of free SO2 and of all SO2. By the second measuring was set also the complex content of anthocyans, flavanols and optical density by wave lengths of 280 nm, 320 nm, 360 nm and 520 nm. Five trained evaluators participated in the sensory evaluation, for which were used the 100 points tables and the glasses OIV. While the wine tasting the single closures were concealed.
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