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Characteristic properties of axial stages of working machines
Hejduk, Michal ; Šnajdárek, Ladislav (referee) ; Škorpík, Jiří (advisor)
This bachelor work is dealing with conclusion of basic characteristic of axial stages working machines. First part of this thesis presents the characteristics of principle behind every turbomachinery therefore not only the working machine but turbine as well. In the end of the first part the basic equations, which may be needed in the construction of such machines. Second part focuses on characteristic features, which are the same or very similar throughout axial turbomachinery. The last part of this thesis works with usage of different work machines in the industry. It is also mentioned here why are the axial turbomachinery work machines used instead of radial or tangential work machines
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Condenser design of a nuclear power plant
Hejduk, Michal ; Šnajdárek, Ladislav (referee) ; Milčák, Pavel (advisor)
The topic of this master´s thesis is the design of the steam generator for a nuclear power plant with VVER 440 reactor. The first part of this thesis describes a brief history of nuclear research, which is followed by an overview of nuclear reactors used now. The next part deals the types of steam the types of steam generators used today with their basic elements and design recommendations. The last and final part is the design of a steam generator for nuclear power plant with a VVER 440 reactor. Above all, is the thermal calculation of the steam generator and behaviour of steam generator depending on the reactor power. The design solution of steam generator and its strength calculation. The last part of the steam generator calculation the pressure loss of the steam generator is investigated.
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Simulations of dynamics of ultra-cold quantum plasma
Rendek, Andrej ; Hejduk, Michal (advisor) ; Roučka, Štěpán (referee)
Title: Simulations of dynamics of ultra-cold quantum plasma Author: Andrej Rendek Department: Department of Surface and Plasma Science Supervisor: Mgr. Michal Hejduk, Ph.D., Department of Surface and Plasma Science Abstract: We investigate the confinement of charged particles in an oscillating electromagnetic field, intending to trap electrons and calcium ions simultaneously. The theoretical part of this thesis focuses on the derivation of exact and effective potentials in a single frequency quadrupole trap. We show a general treatment of stability in such a field. Passing attained knowledge onto two-frequency trapping, which is much more suitable for confining two species with widely different charge-to-mass ratios. We follow up by studying the stability of electrons, employing computer simulations in the ideal two- frequency Paul trap. Our ambition is to identify a stable configuration minimizing electrons' temperature. We create multiple ion Coulomb crystals and examine the effect of their presence on electrons' stability. These efforts support the development of an experiment with the ambition to create and study quantum plasma. The composition of this experiment is outlined here as well. Keywords: Ion trapping, Coulomb crystal, Two frequency Paul trap
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Quantum-mechanical entangling of optical resonator with ions in ultra-cold plasma
Hudák, Ivan ; Hejduk, Michal (advisor) ; Kaňka, Adolf (referee)
Quantum thoery predicts an existence of strong and collective strong coupling regime of atoms and electromagnetic field inside and within optical resonator. As an optical resonator is being used in optical cavity. In this regime it is possible to study atoms in excited states and their interaction with optical resonator. This thesis focuses on design of optical resonator and experimental procedures of making curved surfaces on fibers which are needed for its assembly. In order to stabilise the frequency of electromagnetic field, it is necessary to design the stabilizing algorithm. This algorithm for analyzing data examines cavity spectra for specific parametres of the research. 1
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Condenser design of a nuclear power plant
Hejduk, Michal ; Šnajdárek, Ladislav (referee) ; Milčák, Pavel (advisor)
The topic of this master´s thesis is the design of the steam generator for a nuclear power plant with VVER 440 reactor. The first part of this thesis describes a brief history of nuclear research, which is followed by an overview of nuclear reactors used now. The next part deals the types of steam the types of steam generators used today with their basic elements and design recommendations. The last and final part is the design of a steam generator for nuclear power plant with a VVER 440 reactor. Above all, is the thermal calculation of the steam generator and behaviour of steam generator depending on the reactor power. The design solution of steam generator and its strength calculation. The last part of the steam generator calculation the pressure loss of the steam generator is investigated.
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Characteristic properties of axial stages of working machines
Hejduk, Michal ; Šnajdárek, Ladislav (referee) ; Škorpík, Jiří (advisor)
This bachelor work is dealing with conclusion of basic characteristic of axial stages working machines. First part of this thesis presents the characteristics of principle behind every turbomachinery therefore not only the working machine but turbine as well. In the end of the first part the basic equations, which may be needed in the construction of such machines. Second part focuses on characteristic features, which are the same or very similar throughout axial turbomachinery. The last part of this thesis works with usage of different work machines in the industry. It is also mentioned here why are the axial turbomachinery work machines used instead of radial or tangential work machines
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Reactions of Hydrogen Molecules with Ions and Recombination of H+3 Ions with Electrons at Cryogenic Temperatures
Hejduk, Michal ; Glosík, Juraj (advisor) ; Čížek, Martin (referee) ; Votava, Ondřej (referee)
We studied how distribution of nuclear-spin states of H+ 3 ions or H2 molecules influence rate coefficients of H+ 3 -electron recombination or reactions of H2 with N+ or H+ , with regard to kinetic and internal temperatures of the reactants. Experiments were carried out in plasma environment or in an ensemble of ions in an ion trap. Main diagnostic methods were the Langmuir probe diagnos- tics, laser absorption- and mass spectroscopy. The distribution of nuclear spin states (para and ortho) was varied using a specially constructed para-hydrogen generator. We performed pioneer measurements of the rate coefficients for the nuclear-spin-state-selective binary and ternary H+ 3 -electron recombination in thermalised plasma. We performed studies of N+ + para/ortho-H2 reaction with high accuracy and interpreted the results as dependent on fine structure states of N+ ions. We measured a temperature dependence of the rate coeffi- cients for radiative and ternary channels of H+ + para/ortho-H2 association. 1
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Ion trap
Hejduk, Michal ; Glosík, Juraj (advisor) ; Poterya, Viktoriya (referee)
In the thesis, elementary problems observable in a temperature variable linear multipole trap are described. Those elementary processes that are important for low-temperature interstellar plasma are briefly summarized in the first part. In the same chapter, a theory about particles-confinement in a Paul trap is shortly explained as well. In the second part of the work, the Atomic Beam 22-Pole Trap experimental apparatus from the Physical Institute of the Nature Science Faculty of the Technical University in Chemnitz is described. In the last section, first measurements using the mentioned apparatus are described and interpreted.
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