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Optimizing design of electric machines
Šporcr, Viktor ; Klíma, Jiří (referee) ; Janda, Marcel (advisor)
Semester theses focus on optimisation methods useful for construction electric machines. Contain elementary sorting optimization methods and brief description of their algorithms. In these theses is foreshadow how shape of asynchronous stator core should be optimized for better effectivity. Next chaps are discuss about application optimization methods to concrete induction motor.
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Design of Line-start synchronous machine
Lolová, Iveta ; Klíma, Jiří (referee) ; Bárta, Jan (advisor)
This thesis deals with line-start permanent magnet synchronous motor, because in these days the world focuses on energy saving more than ever. Line-start permanent magnet motors represents a possible replacement for asynchronous motors, which are the most used kind of motors and constitute one of the greatest energy consumption apparatuses in the world. The efficiency improvement of induction motors is usually achieved through design optimization of induction motors resulting in limited degrees of success. This thesis also thoroughly explains LSPMSM topology and compares properties of the line-start permanent magnet motors and asynchronous motors. This thesis deals with the design of line-start permanent magnet synchronous motor based on previously designed asynchronous motor. In the last chapter LSPMSM is investigated in RMxprt and Ansys Maxwell.
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Increase of efficiency of a single phase induction machine
Muczka, Vojtěch ; Klíma, Jiří (referee) ; Mach, Martin (advisor)
This thesis is dedicated to efficiency increase of one phase induction machine through material change of induction cage and rotor slot shape optimization under the condition of maintaining the same locked-rotor torque. In the first part of this thesis is the explanation of induction machine principles. Next is the comparison of measured and simulated parameters of small one phase machine from ATAS company. The following part is dedicated to the analysis of rotor slot shape and ring size influence on machine parameters when using pure aluminum instead of resistive alloy. The next chapter deals with slot shape optimization in the program RMxprt, controlled by genetic algorithm written in MATLAB interface. In the final part are the resultant slot shapes simulated in Ansys Maxwell using finite element method and then the measured, simulated and expected parameters are compared.
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Design of a high-speed electrical machine.
Šolc, Martin ; Klíma, Jiří (referee) ; Mach, Martin (advisor)
This diploma thesis is dedicated to design of highspeed induction motor with power 30 kW, 60 000 rpm. In the beginning of the thesis basic problematic of highspeed motors, used materials and motor types is discussed. The practical part of the thesis concerns design of the motor itself, creating a model in ANSYS Maxwell software, performing several simulations and optimalization of the designed machine. In the last parf of this thesis each simulation is evaluated and the final model of the machine is introduced.
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Design and measurement of a small induction motor
Fišer, Jan ; Klíma, Jiří (referee) ; Mach, Martin (advisor)
This bachelor thesis deals with design and measurement of a small induction motor. The introduction describes a structure and an operating principle of the induction motor. The following part deals with analytical calculation of three-phase induction motor‘s properties. Next are executed an analytical calculations and a finite element method calculations by the Maxwell software. In the end are these calculations compared with results from measurement.
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Mechanisms determining the identity of intestinal epithelial cells
Berková, Linda ; Valenta, Tomáš (advisor) ; Krylov, Vladimír (referee) ; Klíma, Jiří (referee)
(ENG) The intestinal epithelium has been heavily studied for decades. It is a traditional model to study the natural renewal of tissue during homeostasis and upon the damage, carcinoma establishment and progression and regulation of stem cells by Wnt signalling. Since the main interest in the tissue is focused on epithelial stem cells, it has been described quite recently that also all differentiated epithelial cells from the small intestine including enterocytes undergo drastic changes in properties during their short life. This phenomenon came to be known as villus zonation. In parallel with that observation, the heterogeneity of intestinal mesenchymal cells and their impact on intestinal epithelium have been gradually revealed. Distinct populations of mesenchymal cells secrete specific signalling molecules, which determine the destiny of epithelial cells. Those signalling molecules regulate stem cell maintenance as well as villus zonation. Our work combines those novel findings of intestinal enterocytes and mesenchymal cells. We studied the effect of distinct Bmp ligands produced by mesenchymal cells on the differentiation of enterocytes. We treated small intestinal epithelial cells with recombinant Bmp proteins in vitro and analysed changes in their gene expression by RNA sequencing. We...
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Comparison of tinnitus treatment by selected therapeutic approaches.
Klíma, Jiří ; Malá, Jitka (advisor) ; Vláčilová, Ivana (referee)
Author: Bc. Jiří Klíma Title: Comparison of tinnitus treatment with selected therapeutic approaches Objectives: The aim of this thesis is to investigate the effectiveness of selected therapeutic approaches in the treatment of subjective chronic tinnitus. These approaches are manual therapy, low-power laser therapy and cognitive behavioural therapy. Another aim is to determine which of these approaches is the most effective. Last but not least aim is to summarize the current knowledge about tinnitus. Methods: The thesis is processed in the form of literature review. First, the current theoretical background is described, then the objectives of the thesis and research questions are set. Then the methodology is described and the results are presented and discussed. Last but not least, the limitations of this thesis and the studies are described. Results: In total, 13 studies were found that met the criteria. Based on these studies, it appears that both manual therapy and cognitive behavioural therapy lead to a significant reduction in tinnitus severity in some patients with subjective chronic tinnitus. The results of studies investigating the effect of low-power laser therapy have been inconsistent, but most have concluded that it is also effective in reducing the severity of tinnitus in patients with...
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(Spectro) Electrochemical Study of Cibalackrot Derivatives – Potential Chromophores for Singlet Fission\n
Šimková, Ludmila ; Lušpai, Karol ; Klíma, Jiří ; Ludvík, Jiří
Recently, substantial attention has been paid to the search for suitable chromophores for singlet fission. This photophysical effect promises to increase the maximum of theoretical efficiency of solar cells. One type of candidates are derivatives of cibalackrot. Redox properties are critical for their use. Our electrochemical work is focused on the study of oxidation and reduction of a series of substituted cibalackrot derivatives using classic voltammetric techniques and their combination with in situ UV-vis and EPR spectroscopy. The results show the reversible formation of the radical anion (cation) in the first reduction (oxidation) step enabling determination of ´´electrochemical´´ HOMO-LUMO gap.
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