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Elektromagnetic field mapping in tissue
Port, Martin ; Čížek, Martin (referee) ; Rozman, Jiří (advisor)
This thesis is an introduction to the modeling of electromagnetic fields in the tissue and is focused on the knowledge of electromagnetic field theory. Maxwell's equations and their solutions are described the spread of plane waves in the environment. It also discusses the exposure limit values of specific absorbed power and hygienic limits based on the standards in force in the Czech Republic on health protection against nonionizing radiation in accordance with Government Regulation No. 106/2010 Coll. It also deals with the software interface in COMSOL Multiphysics 4.2 for solving physical modeling and simulation. There is mention of the RF module, which is used for modeling. Work mentions in detail about the menu of the program and the most important part - the Model Builder.
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Radiation pattern shaping of the optical transmitter
Csonka, Gábor ; Němeček, Jiří (referee) ; Wilfert, Otakar (advisor)
This work deals with questions of space assembling of several optics beams. There are mentioned the base features and values of space distribution of beam intensity in laser beam. The forms of diffusion of space localized light that is described by beam optics. There is a characterization of Gaussian beam, and diffraction of several beams. There is mentioned a simulation an assembling of two and more beams. It contains model of assembling incoherent beams. The work also includes suggestion of final layout of laser beams, which form optical transmitter with radiating characteristics, resistant to defects evoked by atmosphere.
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Damping of pressure pulsations and noise reduction in pipeline systems
Čepl, Ondřej ; Pochylý, František (referee) ; Habán, Vladimír (advisor)
The diploma thesis deals with pressure pulsations in pipeline system with dynamic muffler. There is presented original geometry of side-branch resonator. Pressure pulsations are solved by a created mathematical model, numerical simulations and verified by an experimental approach. The influence of dynamic and bulk viscosity is involved in derived governing equations. A system of nonlinear equations is solved by genetic algorithm and frequency dependent relationship of bulk viscosity of air is determined afterwards. The correct function of used pressure sensors is tested. The processing of experimental data is performed by the fast Fourier transform with coherent sampling. Finally, a comparison of analytical, numerical and experimental approaches is introduced for different geometric variants of presented muffler.
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Pressure pulsation propagation in elastic hoses
Čapoš, Eduard ; Pochylý, František (referee) ; Habán, Vladimír (advisor)
This thesis deals with propagation of pressure and flow pulsations, which are strongly affected by the tube flexibility. There are two mathematic models introduced, which are derived from basic physical relations. First model assumes velocity only in the axis direction. Second one assumes also non-zero radial velocity. Kelvin-Voigt model for viscoelasticity was used. Furthermore, experimental measurement was designed and evaluated. Measured data was used to calculate material properties. In addition, dynamic transfer was determined.
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Visualization of Tactile and Aural Sensations
Lukš, Roman ; Zachariáš, Michal (referee) ; Polok, Lukáš (advisor)
The purpose of this thesis is to design and implement visualization of aural and tactile sensations in the real-time. Sensations are to replace vision in simple 2D platform game. Visualizations are implemented on GPU. Vizualization of aural sensations implement computationally lightweight explicit method. Vizualization of tactile sensations are implemented as the animated lines. OpenGL is used to draw graphic output. Functional game prototype with vizualization of these two sensations is the output of this thesis.
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Sturm-Liouville problem in vibration of continuous systems
Varmusová, Alanis ; Nechvátal, Luděk (referee) ; Šremr, Jiří (advisor)
The goal of this thesis is to compile the theory concerning the Sturm-Liouville problem and partial diferential equations of the second order. Based on the findings the necessary eigenvalues, eigenfunctions and Green's functions, which are connected with the Sturm-Liouville problem, are derived in the thesis. Results of derivation are used in the solution of the initial-boundary value problem for wave equation, which results are then interpreted graphically.
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Numerical method for computing electromagnetic field
Bíreš, Pavol ; Čížek, Martin (referee) ; Rozman, Jiří (advisor)
The aim of the work is to study the electromagnetic field theory, finite element method and the interaction of electromagnetic field with tissues. Gained knowledge is then used to calculate spreading of the electromagnetic field in the microwave field and to create a temperature profile of spreading the electromagnetic fields in human tissue. The finite element method was implemented in the Matlab programming environment, where the 1D model was created in the frequency and time domain and a simple 2D model created in time domain. The program was developed to analyze spreading electromagnetic wave. Another part of work was done in the programming environment of COMSOL Multiphysics. In this case was the human leg exposed to electromagnetic fields. The analysis determined the changes of temperature in these biological tissues for six minutes.
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Sturm-Liouville problem in vibration of continuous systems
Varmusová, Alanis ; Nechvátal, Luděk (referee) ; Šremr, Jiří (advisor)
The goal of this thesis is to compile the theory concerning the Sturm-Liouville problem and partial diferential equations of the second order. Based on the findings the necessary eigenvalues, eigenfunctions and Green's functions, which are connected with the Sturm-Liouville problem, are derived in the thesis. Results of derivation are used in the solution of the initial-boundary value problem for wave equation, which results are then interpreted graphically.
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Damping of pressure pulsations and noise reduction in pipeline systems
Čepl, Ondřej ; Pochylý, František (referee) ; Habán, Vladimír (advisor)
The diploma thesis deals with pressure pulsations in pipeline system with dynamic muffler. There is presented original geometry of side-branch resonator. Pressure pulsations are solved by a created mathematical model, numerical simulations and verified by an experimental approach. The influence of dynamic and bulk viscosity is involved in derived governing equations. A system of nonlinear equations is solved by genetic algorithm and frequency dependent relationship of bulk viscosity of air is determined afterwards. The correct function of used pressure sensors is tested. The processing of experimental data is performed by the fast Fourier transform with coherent sampling. Finally, a comparison of analytical, numerical and experimental approaches is introduced for different geometric variants of presented muffler.
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Pressure pulsation propagation in elastic hoses
Čapoš, Eduard ; Pochylý, František (referee) ; Habán, Vladimír (advisor)
This thesis deals with propagation of pressure and flow pulsations, which are strongly affected by the tube flexibility. There are two mathematic models introduced, which are derived from basic physical relations. First model assumes velocity only in the axis direction. Second one assumes also non-zero radial velocity. Kelvin-Voigt model for viscoelasticity was used. Furthermore, experimental measurement was designed and evaluated. Measured data was used to calculate material properties. In addition, dynamic transfer was determined.
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