|
|
Processing of compact polycrystalline YAG ceramics
Kaplan, Lukáš ; Pouchlý, Václav (referee) ; Kachlík, Martin (advisor)
In the literary part of this master thesis a research on various methods of preparation of dense polycrystalline YAG ceramics and the effects of sintering on the densification and other desired properties of such prepared YAG ceramics was carried out, the transparency after addition of dopant elements was also discussed. In the experimental part of the thesis, samples of dense polycrystalline YAG ceramics were prepared by SSR method and the effect of sintering on the densification and porosity of the YAG ceramic samples was studied. Relative density, porosity, phase purity and transparency were measured on the sintered samples. These measurements were compared with the results of the works reported in the literature section.
|
|
|
Transparent polycrystalline ceramic materials with cubic lattice structure
Kučera, Jan ; Pouchlý, Václav (referee) ; Maca, Karel (advisor)
The presented work is focused on the study of the influence of preparation parameters on the optical properties of polycrystalline cubic ZrO2 (stabilized with 8 mol.% Y2O3). Furthermore, the work deals with the doping of c-ZrO2 with TiO2 and its effect on the luminescence properties of ZrO2. The examined samples were prepared by uniaxial pressing (10 MPa), followed by a cold isostatic pressing (300 and 700 MPa), pressureless sintering (1340–1380 °C, 10 min), and hot isostatic pressing (1200–1400 °C, 4 h, 200 MPa). In this work, it is shown that the optical properties are significantly affected by the temperature of the hot isostatic pressing, the thickness of the sample, and also by the wavelength of the incident light. A maximum real in-line transmission of 68.8 % was achieved, which is 90.5 % of the theoretical limit for c-ZrO2 at an incident radiation wavelength of 632.8 nm. A low-pressure infiltration method and a powder mixing method were used to prepare the doped ZrO2 ceramic sample. With doping, the maximum of the excitation spectrum shifted from 295 nm (4.20 eV) for the undoped ZrO2 to 320 nm (3.87 eV) for the doped samples. Doping led to an increase in emission intensity compared to a pure ZrO2 by up to 23 times. The maximum emission intensity at 545 nm wavelength was achieved for samples doped by infiltration method with a nominal 0.1 mol.% TiO2 content.
|
|
|
Transparent ceramic materials
Krupa, Filip ; Drdlík, Daniel (referee) ; Maca, Karel (advisor)
This Bachelor thesis deals with processing of transparent cubic ZrO2 ceramic doped by 8 mol% Y2O3. Technology used in this Bachelor thesis are uniaxial pressing, cold isosatic pressing, SPS and hot isostatic pressing. Microstructure, real in-line transparency and hardness were evaluated for sintered transparent materials.
|
|
| |
|
|
The analysis of the influence bourgeois bohemians on american society
Čech, Dominik ; Kýrová, Lucie (advisor) ; Pondělíček, Jiří (referee)
This bachelor thesis deals with the influence of social class, the so-called bourgeois bohemians on American society. The time scope of this work is mainly the turn of the twenty-first century and ends with the economic crisis of 2007. On the background of the transforamtion of modern societies into postmodern, which are characterized by heterogeneity and variability of life attitudes and in which individuality, its behaviour, a values are constantly less determined by class, American author indetified new "upper", class, which represents a new establishment. This thesis presents an introduction and definition of the so-called Bobos class and its categorisation within the context of American society, based mainly on socio-economic factors. This thesis also presents an analysis of the influence of this class on American society. I seek to answer three main question: In what way did can bobos formulated the form of American society? How much they are responsible for the yet more increasing inequality in American society? Are bobos truly "alternative capitalists"?
|
|
|
Processing and properties of transparent polycrystalline ceramic materials
Tásler, Jan ; Pouchlý, Václav (referee) ; Maca, Karel (advisor)
The presented diploma thesis is focused on the preparation and properties of transparent polycrystalline ceramic materials based on Al2O3. Theoretically, the most important technological aspects of the processing of these materials are presented. Detailed attention is given to transparent Al2O3 polycrystalline ceramics doped with rare earth elements. The influence of microstructural parameters on the optical properties (represented by RIT) is investigated on Al2O3 samples doped and codoped with dysprosium, terbium and chromium. A significant effect of the average grain size on the light transmittance of all samples is observed. The highest RIT = 55 % (measured by a laser beam with a wavelength of 632,8 nm) was achieved by an optimized preparation process for a sample doped with 0,05 at. % of dysprosium. For all samples photoluminescent properties are also analysed. The photoluminescent emission spectra correspond to the activation of doping elements. In case of the terbium and chromium codoped samples, the differences in the activation of individual dopants depending on different excitation wavelengths were demonstrated, resulting in different colour emissions for different excitation wavelengths.
|
|
|
The analysis of the influence bourgeois bohemians on american society
Čech, Dominik ; Kýrová, Lucie (advisor) ; Pondělíček, Jiří (referee)
This bachelor thesis deals with the influence of social class, the so-called bourgeois bohemians on American society. The time scope of this work is mainly the turn of the twenty-first century and ends with the economic crisis of 2007. On the background of the transforamtion of modern societies into postmodern, which are characterized by heterogeneity and variability of life attitudes and in which individuality, its behaviour, a values are constantly less determined by class, American author indetified new "upper", class, which represents a new establishment. This thesis presents an introduction and definition of the so-called Bobos class and its categorisation within the context of American society, based mainly on socio-economic factors. This thesis also presents an analysis of the influence of this class on American society. I seek to answer three main question: In what way did can bobos formulated the form of American society? How much they are responsible for the yet more increasing inequality in American society? Are bobos truly "alternative capitalists"?
|
|
|
Case Study of Physiotherapy Treatment of a Patient with the Diagnosis of Total Hip Replacement
Papageorgiou, Chrystalla ; Vomáčková, Helena (advisor) ; Kratochvílová, Pavla (referee)
The abstract of my study concerns the treatment of the case of my patient who had an operation of total hip replacement on the right hip joint, caused by post dysplastic arthrosis. My practice was performed at Fakultni Nemocnice Kralovske Vinohrady. Physiotherapy program started on Tuesday 29th of January 2013 and ended on Friday 1st of February 2013. My Bachelor Thesis is divided in two parts: 1) Theoretical part 2) Practical part. In the theoretical part I analyse everything concerning the hip joint, muscles, joints, bones, ligaments, nerves as well as the biomechanical and kinesiological point of view of the hip joint. In the practical part I analyse every procedure I have done with my patient, all the examinations, conclusions, therapies and results. The patient was operated at OTK FNKV hospital at 22nd of January. Goals of the therapy was to decrease pain and edema, increase range of motion of the movement, increase mobility and elasticity of skin and also improve strength of the operated right hip according to the examinations I provided to the practical part. After the five sessions improvements were detected in the final kinesiologic examination. Pain was decreased to 3/10 according to VAS scale, edema was reduced, range of motion (ROM) of the movements and muscle strength were also...
|
|
| |
|
|
Biomechanical aspects of the reconstruction of the acetabulum
Slávik, Ondrej ; Marcián, Petr (referee) ; Florian, Zdeněk (advisor)
The research part of bacelor’s thesis Biomechanical aspects of the reconstruction of the acetabulum is dealing with historical development and current methods of solving the issue of pathological hip joints in case when use of total endoprosthesis is not suitable, for example in children. Also the anatomical view, related to the given problem situation, is outlined and the most significant disorders of the hip joint, which are connected with these cases, are characterized. In the practical part of this work, there are results of the analysis model between pathological and physiological hips analyzed and qualitatively compared, followed by the solution of the concact forces in these two situations.
|
guest ::
