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Analysis of the usability of a reduction-cooling steam uniton the principle of a vortex tube
Vintr, Lukáš ; Šnajdárek, Ladislav (referee) ; Škorpík, Jiří (advisor)
The aim of the thesis was to describe the current issues of the reduction-cooling station, vortex tube, comment on its use and the design a classic reduction station as the first case. The second practical part was an analysis or comparison of a reduction cooling station operating on the principle of a vortex tube with a conventional one. At the end of the thesis, the problem of determining the radius for the total number of pairs taken is explained. The problem is caused by the instability of potential vortex, which arises mainly because we want to take away matter, but we need to conserve energy. The assumption for the total number of pairs is that it will be more than 10 times higher than the standard variant of the reduction cooling station. From the principle of the vortex tube and the available results, it is clear that the device could be used only for cooling, not for reduction.
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Computational modelling of mucosal wave propagation in human vocal folds
Vintr, Lukáš ; Hájek, Petr (referee) ; Švancara, Pavel (advisor)
The aim of this thesis is to analyze the influence of material parameters of individual layers of vocal cord tissue on the propagation of mucosal waves on the vocal cord model. First, a brief overview of current approaches in experimental and computational modeling of mucosal wave propagation is given on the basis of the literature. Furthermore, the influence of the modulus of elasticity in the tensile epithelium and the surface lamina of propria on the natural frequencies and shapes of oscillations is investigated by means of modal analysis. Mucosal wave propagation was then analyzed using transient analysis in response to the vocal cords to shock excitation by force on the lower part of the vocal cords. The influence of material parameters on the amplitude and speed of mucosal wave propagation over the vocal cord surface was evaluated. In the end of this thesis, the recommendation is given, according to the recorded results, to use lower modulus of elasticity in tension of the surface lamina propria in models with interaction with air flow, because there is much more pronounced mucosal wave propagation corresponding to the behavior of real human vocal cords.
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Conventional and small modular reactors
Vintr, Lukáš ; Lisá, Hana (referee) ; Milčák, Pavel (advisor)
This thesis deals with nuclear energy. It contains a brief history of the development of this industry and provides insight into the process and control of the fission chain reaction used in nuclear reactors. It also describes conventional reactor types and the current state of their use in the world. It then mentions the research objectives set by the Generation IV International forum. Finally, it defines small modular reactors, describes a number of conceptual designs, and presents an analysis of the current state of their development, together with the possibilities of their use for the production of electricity or process heat.
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Conventional and small modular reactors
Vintr, Lukáš ; Lisá, Hana (referee) ; Milčák, Pavel (advisor)
This thesis deals with nuclear energy. It contains a brief history of the development of this industry and provides insight into the process and control of the fission chain reaction used in nuclear reactors. It also describes conventional reactor types and the current state of their use in the world. It then mentions the research objectives set by the Generation IV International forum. Finally, it defines small modular reactors, describes a number of conceptual designs, and presents an analysis of the current state of their development, together with the possibilities of their use for the production of electricity or process heat.
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Analysis of the usability of a reduction-cooling steam uniton the principle of a vortex tube
Vintr, Lukáš ; Šnajdárek, Ladislav (referee) ; Škorpík, Jiří (advisor)
The aim of the thesis was to describe the current issues of the reduction-cooling station, vortex tube, comment on its use and the design a classic reduction station as the first case. The second practical part was an analysis or comparison of a reduction cooling station operating on the principle of a vortex tube with a conventional one. At the end of the thesis, the problem of determining the radius for the total number of pairs taken is explained. The problem is caused by the instability of potential vortex, which arises mainly because we want to take away matter, but we need to conserve energy. The assumption for the total number of pairs is that it will be more than 10 times higher than the standard variant of the reduction cooling station. From the principle of the vortex tube and the available results, it is clear that the device could be used only for cooling, not for reduction.
|
|
|
Computational modelling of mucosal wave propagation in human vocal folds
Vintr, Lukáš ; Hájek, Petr (referee) ; Švancara, Pavel (advisor)
The aim of this thesis is to analyze the influence of material parameters of individual layers of vocal cord tissue on the propagation of mucosal waves on the vocal cord model. First, a brief overview of current approaches in experimental and computational modeling of mucosal wave propagation is given on the basis of the literature. Furthermore, the influence of the modulus of elasticity in the tensile epithelium and the surface lamina of propria on the natural frequencies and shapes of oscillations is investigated by means of modal analysis. Mucosal wave propagation was then analyzed using transient analysis in response to the vocal cords to shock excitation by force on the lower part of the vocal cords. The influence of material parameters on the amplitude and speed of mucosal wave propagation over the vocal cord surface was evaluated. In the end of this thesis, the recommendation is given, according to the recorded results, to use lower modulus of elasticity in tension of the surface lamina propria in models with interaction with air flow, because there is much more pronounced mucosal wave propagation corresponding to the behavior of real human vocal cords.
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