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List of games for ice-hockey skating development in U7-U8 category
Kunc, Jindřich ; Kregl, Jan (advisor) ; Šťastný, Petr (referee)
Title: List of games for ice-hockey skating development in U6-U7 category. Objectives: The main purpose purpose of this thesis was to make a list of fun games with focus on developing the skating ability in U8 category Methods: This thesis was made by researching the information from literature, electronic resources and articles from different countries. Keywords: Ice hockey, kids, younger school age, list of game, games
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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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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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High mobility two-dimensional electron gas in CdTe quantum wells:High magnetic field studies
Kunc, Jan
KurHigh mobility two-dimensional electron gas in CdTe quantum wells: High magnetic field studies Experimental studies of two-dimensional electron gases confined in CdTe and CdMnTe quantum wells are presented. The data analysis is supported by numerical calcula- tions of the band structure of confined states, using the local density and envelope func- tion approximations. Four by four, k.p calculations have been performed to justify the parabolic approximation of valence bands. Samples were characterized by Raman scatter- ing spectroscopy and far infrared cyclotron resonance absorption measurements. Low-field magneto-transport shows the dominant contribution of the semi-classical Drude conduc- tivity and three orders of magnitude weaker contributions of weak localization, electron- electron interaction and Shubnikov-de Haas oscillations. The contribution of electron- electron interactions is explained within a semi-classical model of circling electrons. The shape of Landau levels, broadening, transport and quantum lifetimes and dominant long- range scattering mechanism have been determined. High-field magneto-transport displays fractional quantum Hall states at Landau levels N = 0 and N = 1. The ground states 5/3 and 4/3 have been determined to be fully spin polarized, in agreement with the approach of composite...
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Interaction of short-wavelength laser pulses with matter on various time scales
Vozda, Vojtěch ; Kunc, Jan (advisor) ; Caha, Ondřej (referee) ; Timneanu, Nicusor (referee)
An advent of powerful sources producing intense and ultrashort laser pulses containing high-energy photons opened up a wide range of possibilities to conduct experiments formerly achievable only through theoretical calculations and models. This thesis provides a complex overview of processes which occur right after arrival of the first photons, through lattice heating, up to resolidification and formation of irreversible changes. Irradiated spots and craters formed in various materials are examined employing a wide range of microscopic and spectroscopic methods which provide a deep insight into laser-induced modifications such as detachment of a graphene layer from SiC substrate or thermally-induced diffusion of tellurium inclusions through CdTe lattice. An increased emphasis is placed on beam characterization utilizing ablation and desorption imprints in suitable solids. A proper knowledge of the beam fluence profile may serve for evaluation of diverse damage thresholds as well as for modelling of the pulse propagation or consequent retrieval of otherwise unmeasurable opacity of warm dense aluminium plasma heated to temperatures exceeding tens of thousands of Kelvins. Moreover, the method of desorption imprints is extended to accurate characterization of pulses delivered at MHz repetition rate....
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Growth of graphene by thermal decomposition of silicon carbide for applications in biophysics
Hodoš, Matúš ; Kunc, Jan (advisor) ; Čechal, Jan (referee)
This bachelor thesis is focused on growth and characterization of graphene from SiC powder at different conditions. In the introduction graphene properties are briefly described. Afterwards three methods of graphene growth are discussed, with particular emphasis on thermal decomposition of SiC. Further, the characterization methods which were used by us are explained. In experimental part, three sets of graphene samples prepared by thermal decomposition of SiC will be described, each will differ in one of the factors: temperature, time and ambient atmosphere. Growth samples will be subsequently used in an experiment on yeast. The effect of graphene prepared at different conditions on membrane potential will be determined for possible application in biophysics.
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Fabrication and characterization of atomically thin layers
Tesař, Jan ; Kunc, Jan (referee) ; Procházka, Pavel (advisor)
Tato práce se zabývá oblastí dvourozměrných materiálů, jejich přípravou a analýzou. Pravděpodobně nejznámějším zástupcem dvourozměrných materiálů je grafen. Tento 2D allotrop uhlíku, někdy nazývaný „otec 2D materiálů“, v sobě spojuje neobyčejnou kombinaci elektrických, tepelných a mechanických vlastností. Grafen získal mnoho pozornosti a byl také připraven mnoha metodami. Jedna z těchto metod však stále vyniká nad ostatními kvalitou produkovaného grafenu. Mechanická exfoliace je ve srovnání s jinými technikami velmi jednoduchá, takto připravený grafen je však nejkvalitnější. Práce je také zaměřena na optimalizaci procesu tvorby heterostruktur složených z vrstev grafenu a hBN. Dle prezentovaného postupu bylo připraveno několik van der Waalsových heterostruktur, které byly analyzovány Ramanovskou spektroskopií, mikroskopií atomových sil a nízkoenergiovou elektronovou mikroskopií. Měření pohyblivosti nosičů náboje bylo provedeno v GFET uspořádání. Získané hodnoty pohyblivosti prokázaly vynikající transportní vlastnosti exfoliovaného grafenu v porovnání s grafenem připraveným jinými metodami. V práci popsaný proces přípravy je tedy vhodný pro výrobu kvalitních heterostruktur.
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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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Role of hydrogen during growth of epitaxial graphene on SiC
Sýkora, Petr ; Kunc, Jan (advisor) ; Čechal, Jan (referee)
This work is focused on preparation of graphene by epitaxial growth on silicon face of silicon carbide. In the introduction, the interesting properties of graphene are briefly described, and its possible applications are mentioned. Subsequently, the methods of preparation are discussed with an emphasis on epitaxial growth and the role of hydrogen on the process itself. Further, the possible ways of measuring graphene samples are explained and three of them are analyzed in more detail - Raman spectroscopy, atomic force microscopy, and Hall effect measurement. The experiment itself is focused on the effect of argon-hydrogen atmosphere on the growth of graphene. 1
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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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