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Design of demonstration panel KNX
Kalfus, Petr ; Kunc, Josef (referee) ; Bátora, Branislav (advisor)
This bachelor's thesis deals with the design of a demonstration panel KNX, which has to demonstrate the control of lights, blinds and appliances of the house with the help of devices from various manufacturers First, there is a search and acquaintance with the KNX system, it´s topological arrangement, devices and used communication media. Furthermore, an introduction is made to the individual devices used on the demonstration panel, with the functions they enable and with their application programs for the ETS environment. Based on the possibilities of the device, the design of the panel function is done. These functions have been programmed in the ETS 5. Next, a drawing of the electrical connection of the panel is made and documentation is made for it. Finally, an overall evaluation is made.
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Interaction of low-energy electrons with graphene field effect transistors
Vysocký, Filip ; Kunc, Jan (referee) ; Čechal, Jan (advisor)
This diploma thesis is focused on fabrication of graphene field-effect transistors, characterisation of their transport properties and investigation of low-energy electron beam influence on the devices' properties under UHV conditions. The theoretical part of this work describes graphene fabrication methods, options of graphene transfer onto the substrates for graphene field-effect transistor manufacture. Furthermore, model of graphene doping via electrostatic interaction or photon, resp. electron beam exposition is explained. The experimental part of this work consist of manufacture of the graphene field-effect transistor in order to examine the change of its transport properties induced by doping of the graphene via low-energy electron beam exposition.
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Low energy excitations in oriented graphite by THz magneto-optical spectroscopy
Dubský, Jan ; Kunc, Jan (referee) ; Vrba, Radimír (advisor)
This master’s thesis deals with the modelling of electronic properties of graphite crystal, which are measurable using a spectrometer based on high frequency electron paramagnetic resonance (HFEPR for short) located in laboratories of CEITEC BUT. This is especially the band structure of graphite and its Landau levels. The theoretical part of the thesis describes key effects and connections from quantum mechanics and definitions of important terms from solid state physics, which are used to describe the crystalline structure of graphite and its electronic properties. Furthermore, the project describes the HFEPR spectrometer and its functional principle. In the practical part of the thesis, there are numerical models of the band structure of graphite and of its Landau levels and description of the preparation of a graphite sample for measurement. At the end of the practical part there is the analysis of measurements results, namely the cyclotron resonance and Shubnikov-de Haas oscillations, thanks to which it is possible to determine physical parameters of the sample, such as effective mass of charge carriers and fundamental frequency.
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A rheology of high viscosity portland cement pastes applied on extrusion technology
Tihlařík, Petr ; Kunc, Jaroslav (referee) ; Lang,, Karel (referee) ; Šťastník, Stanislav (referee) ; Fridrichová, Marcela (advisor)
The aim of this doctoral thesis is to verify a possibilities of fibercement extrusion. A mixture for extrusion is typical for its high toughness and high fiber content, as the fiber content may be several times higher than when utilizing other production methods. The technology of a twin shaft kneader makes it possible to produce homogenous mixture for extrusion with low water/cement ratio. With use of auger moulder a mixture of high toughness is formed to final shape. The extreme shear and pressure stress is applied in the process. Therefore high requirements are posed on the equipment.
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Android application for measuring user satisfaction with mobile data service
Kunc, Jaroslav ; Povoda, Lukáš (referee) ; Červenák, Rastislav (advisor)
The bachelor thesis focuses on user satisfaction with mobile data services. The thesis in this context explains the terms of Quality of Service, Quality of Experience and Crowdsourcing. An another part of a thesis is focusing on describing the development of applications for the Android platform, including the distribution and application testing. In the practical part of thesis, the application for the Android platform is created and it is predicting the user satisfaction with mobile data services on the basis of an analytical model for calculating MOS (Mean Opinion Score).
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Design and programming of lighting scenes in an art gallery with visualization
Novotný, Jaromír ; Kunc, Josef (referee) ; Bátora, Branislav (advisor)
This work is intended to serve as an introduction to the theoretical basis for working with decentralized bus system named KNX. There is describe the current lighting solutions situation in the O. H. Hajek gallery in town Prachatice. There is familiarization with devices were used for this solution. The last part is describing how to work with the ETS and programming devices. To visualize system on smart device based Android was chosen SmartServer and is theoretically described in chapter Vizualizace.
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Graphene doping by low-energy electrons
Stará, Veronika ; Kunc, Jan (referee) ; Čechal, Jan (advisor)
Tato diplomová práce se zabývá dotováním grafenu nízkoenergiovými elektrony. Na křemíkový substrát pokrytý vrstvou SiO2 jsou pomocí litograficky vyrobené masky nadeponované kovové kontakty z titanu a zlata. Grafen vyrobený pomocí metody depozice z plynné fáze je přenesen na substrát a slouží jako vodivé spojení kovových elektrod, které vytvářejí kolektor a emitor. Na křemík je ze spodu přivedeno napětí, které tak vytváří spodní hradlo. Takto vytvořený grafenový tranzistor je ozařován nízkoenergiovými elektrony, které mění dotování grafenu. Z polohy maxima v závislosti odporu grafenu na hradlovém napětí lze vyčíst typ dotování. Toto maximum udává napětí, při kterém Fermiho meze grafenu prochází Diracovým bodem v pásové struktuře grafenu. Velikost hradlového napětí, primární energie elektronového svazku a proud svazku jsou tři parametry, které mají velký vliv na změny dotování. Při ozařování transistoru dochází ke změně typu dotování právě tehdy, když odpor grafenu v závislosti na hradlovém napětí dosáhne maxima. Vývoj této změny je zkoumán pro různé energie a proudy primárního svazku v závislosti na hradlovém napětí i v čase. Typ dotování je také prozkoumán při zastavení ozařování v různých fázích smyčky hradlového napětí. Dopování grafenu nízkoenergiovými elektrony je popsáno v teoretickém modelu.
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The aqueduct under the highway through of the microtunnel
Hoza, Martin ; Kunc, Jaroslav (referee) ; Horák, Vladislav (advisor)
During the construction of water pipeline Strelice is necessary to overcome the D1 motorway. This thesis deals with design of the motorway crossing using trenchless technologies. Combination of pipejacking and shield tunneling is chosen. Static calculation includes determination of the jacking force, proposal of the thrust block and assessment of the reinforced concrete jacking pipes.
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New laboratory tasks of the KNX system
Welter, Martin ; Kunc, Josef (referee) ; Bátora, Branislav (advisor)
The bachelor's thesis deals with the design of laboratory tasks for the control of the KNX system electrical installation using devices from the company Hager and Berker. The first part discusses the characteristics of the KNX system, topological arrangement, ETS software, communication media. Furthermore, the remote control of KNX wiring is briefly discussed with subsequent visualization from various companies. The next part is devoted to getting acquainted with the devices that will be used for laboratory tasks with the subsequent creation of laboratory instructions. All functions have been programmed in ETS5 software. Finally, an overall evaluation is made.
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