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Advanced Abrasion Resistant Coatings for Vacuum Systems
Hégr, Eduard ; Kudláček,, Petr (referee) ; Hrubý, Vojtěch (referee) ; Švejcar, Jiří (advisor)
The thesis is focused on research of advanced surface resistant coatings which have a direct effect on increasing of functional properties of vacuum systems (eg reducing wear of individual pump components, surface inertia to aggressive gases/molecules). But they can also secondarily affect other important pump properties (eg reducing pump temperature). The studied layers/coatings are divided into three areas (i) hard anodic layer, (ii) hard anodic layer with PTFE coating and (iii) DLC coating. The initial material (substrate) is an aluminum-based alloy, which was used for this purpose. In presented thesis, the influence on increase of material and physical properties was demonstrated, such as the increase of hardness and abrasion resistance of the surface after the application of the anodic layer with PTFE coating. The theoretical part of thesis describes the basic principles of preparation of abrasion-resistant layers/coatings and also introduces the vacuum physics. It shows the basic principles of obtaining vacuum, which give a comprehensive picture of the importance of working with advanced coatings. The experimental part is divided into the evaluation of the microstructure of the sample material and the second part is focused on the experiments needed to obtain/measure the required properties, which can be further used to predict damage of the layers/coatings.
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Energy consumption food-factory
Hrubý, Vojtěch ; Pospíšil, Jiří (referee) ; Fiedler, Jan (advisor)
Venting, ventilation, air-conditioning and heating serving to maintain given conditions, e.g. temperature, humidness and hygiene standards for the clean air of production and other areas bring various difficult processes provided by different complicated equipments and systems. Goal of this graduation theses is to describe these proceses and actual situation in heat energy supply in food factory conditions of Cutisin in Slavkov u Brna. The main benefit of this graduation these is the description of actual central heating solution, state evaluation and innovative suggestion for the lay-out solution of central boiler-room.
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Biomass Heating Power Plant
Hrubý, Vojtěch ; Pospíšil, Jiří (referee) ; Fiedler, Jan (advisor)
The content of this dissertation is to utilize foundations of heat consumption in Velký Karlov and to propose and replace the main district heating plant into the heating plant which uses biomass as its fuel. With techno-economic evaluation of the annual operating central heating plant evaluate the suitability of using a steam turbine or steam engine. The proposal for a steam turbine is chosen by the preliminary calculation. There are showed suitable possibilities of working and its evaluation considered to return period.
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Vliv druhu omráčení jatečných zvířat na kvalitu produktu
Hrubý, Vojtěch
The goal of the bachelor's thesis was to study and describe operations and principles of slaughtering domestic animals. Starting with transporting the animals to the slaughterhouse, describing all the required actions including the final treatment of the carcass. Thesis deals with differences in various technologies and ways of processing diverse domestic animal species--both locally significant and rare and atypical for the Czech Republic. Work then describes legislative requirements related to various operations on the slaughtering line and at home slaughters. In second part it solves the problematics of stunning, analysing it based on price and severity of each of the stunning methods. It also deals with how those differences may affect quality of the initial material. Finally, new trends appearing locally and globally and ways those can improve meat quatity are mentioned.
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Laser absorption spectroscopy
Vyhlídka, Štěpán ; Plašil, Radek (advisor) ; Hrubý, Vojtěch (referee)
Study of recombination of molecular ionts in cold plasma plays a key role in our understanding of chemical kinetics in interstellar space or in upper layers of planetar atmospheres. Various metods are used for its study of which important part is laser absorption spectroscopy. Concentration or temperature of measured ionts can be found from their absorption spectra. In the presented work two spectroscopic techniques are briefly introduced - Cavity ringdown spectroscopy and Laser induced reaction technique. Main me- chanisms for spectral linewidth broadening are described and from absorption spectra of H+ 3 and N+ 2 ionts measured by above-mentioned techniques their kine- tic temperature is discovered. Because it is affected by spectral width of applied laser diodes, a part of this work also deals with description of its measurement by self-heterodyne method or Fabry-Pérot interferometer. The spectral width is found for infrared diode DFB laser. 1
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Advanced Abrasion Resistant Coatings for Vacuum Systems
Hégr, Eduard ; Kudláček,, Petr (referee) ; Hrubý, Vojtěch (referee) ; Švejcar, Jiří (advisor)
The thesis is focused on research of advanced surface resistant coatings which have a direct effect on increasing of functional properties of vacuum systems (eg reducing wear of individual pump components, surface inertia to aggressive gases/molecules). But they can also secondarily affect other important pump properties (eg reducing pump temperature). The studied layers/coatings are divided into three areas (i) hard anodic layer, (ii) hard anodic layer with PTFE coating and (iii) DLC coating. The initial material (substrate) is an aluminum-based alloy, which was used for this purpose. In presented thesis, the influence on increase of material and physical properties was demonstrated, such as the increase of hardness and abrasion resistance of the surface after the application of the anodic layer with PTFE coating. The theoretical part of thesis describes the basic principles of preparation of abrasion-resistant layers/coatings and also introduces the vacuum physics. It shows the basic principles of obtaining vacuum, which give a comprehensive picture of the importance of working with advanced coatings. The experimental part is divided into the evaluation of the microstructure of the sample material and the second part is focused on the experiments needed to obtain/measure the required properties, which can be further used to predict damage of the layers/coatings.
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|
|
Laser absorption spectroscopy
Vyhlídka, Štěpán ; Plašil, Radek (advisor) ; Hrubý, Vojtěch (referee)
Study of recombination of molecular ionts in cold plasma plays a key role in our understanding of chemical kinetics in interstellar space or in upper layers of planetar atmospheres. Various metods are used for its study of which important part is laser absorption spectroscopy. Concentration or temperature of measured ionts can be found from their absorption spectra. In the presented work two spectroscopic techniques are briefly introduced - Cavity ringdown spectroscopy and Laser induced reaction technique. Main me- chanisms for spectral linewidth broadening are described and from absorption spectra of H+ 3 and N+ 2 ionts measured by above-mentioned techniques their kine- tic temperature is discovered. Because it is affected by spectral width of applied laser diodes, a part of this work also deals with description of its measurement by self-heterodyne method or Fabry-Pérot interferometer. The spectral width is found for infrared diode DFB laser. 1
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Biomass Heating Power Plant
Hrubý, Vojtěch ; Pospíšil, Jiří (referee) ; Fiedler, Jan (advisor)
The content of this dissertation is to utilize foundations of heat consumption in Velký Karlov and to propose and replace the main district heating plant into the heating plant which uses biomass as its fuel. With techno-economic evaluation of the annual operating central heating plant evaluate the suitability of using a steam turbine or steam engine. The proposal for a steam turbine is chosen by the preliminary calculation. There are showed suitable possibilities of working and its evaluation considered to return period.
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