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Evaluation of sample geometry effect on creep deformation progress using acoustic emission method
Dvořák, Jiří ; Sklenička, Václav ; Král, Petr ; Kvapilová, Marie ; Svobodová, M. ; Šifner, J. ; Koula, V.
This work deals with the determination of the influence of the sample geometry on the development of failure during creep exposure. Creep tests were carried out at temperature of 600 °C and a stress of 180 MPa in the protective atmosphere of argon. P92 steel samples with a conventional smooth surface and samples with a V-groove notch were chosen for the test tests. The results of creep resistance and fracture behaviour were complemented by detailed microstructural characterization to assess damage initiation and development. Based on the measured results, the creep data was evaluated using neural networks that systematically search for and process the signal from the acoustic emission (AE). Acoustic emission serves here as an effective non-destructive method for early prediction of the beginning of a possible accident of components of power and chemical plants.
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Nonlinear analysis of reinforced concrete structures
Král, Petr ; Salajka, Vlastislav (referee) ; Hradil, Petr (advisor)
The aim is to design and evaluate nonlinear beams analysis, which will be subjected by four – point bending. Nonlinear analysis will be performed and evaluated on three beam models, the first of which will be made from plain concrete, the second of which will be made from reinforced concrete with reinforcement bars in the domain of tensile stress and the third of which will be made from reinforced concrete with reinforcement bars in domains of tensile and compressive stress. The thesis will be included formation of appropriate FE models, performance of nonlinear calculations with using nonlinear material model from a library of nonlinear material models multiPlas in the programming environment of software ANSYS and subsequent evaluation of results. Evaluation of results will consist from evaluation of nonlinear beams analysis and from evaluation of beams analysis according to ČSN EN 1992 – 1 – 1 without reinforcement bars and with reinforcement bars in these variants, next from comparison of nonlinear beams analysis with a beams analysis according to ČSN EN 1992 – 1 – 1 and finally from evaluation of the yield condition, which will be applied to the beams.
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Verification of nonlinear material models of concrete
Král, Petr ; Němec, Ivan (referee) ; Hradil, Petr (advisor)
Diploma thesis is focused on the description of the parameters of nonlinear material models of concrete, which are implemented in a computational system LS-DYNA, interacting with performance of nonlinear test calculations in system LS-DYNA on selected problems, which are formed mainly by simulations of tests of mechanical and physical properties of concrete in uniaxial compressive and tensile on cylinders with applying different boundary conditions and by simulation of bending slab, with subsequent comparison of some results of test calculations with results of the experiment. The thesis includes creation of appropriate geometric models of selected problems, meshing of these geometric models, description of parameters and application of nonlinear material models of concrete on selected problems, application of loads and boundary conditions on selected problems and performance of nonlinear calculations in a computational system LS-DYNA. Evaluation of results is made on the basis of stress-strain diagrams and load-displacement diagrams based on nonlinear calculations taking into account strain rate effects and on the basis of hysteresis curves based on nonlinear calculations in case of application of cyclic loading on selected problems. Verification of nonlinear material models of concrete is made on the basis of comparison of some results of test calculations with results obtained from the experiment.
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The Proposal of Improvement in Offer of Hotel Services
Jašová, Zuzana ; Král, Petr (referee) ; Mikulec, Luděk (advisor)
The diploma thesis was processed at the Hotel Pod Zámkem at Velké Meziříčí. It analyzes and evaluates its marketing communication and examines imperfections in this field. It contains proposals for improving the company promotion, which include new methods of the company marketing communication and their application in practice, leading to a growth of the hotel and the restaurant.
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Implementation of ICT Security Management in Highschool
Matusík, Jan ; Král, Pavel (referee) ; Ondrák, Viktor (advisor)
The aim of this bachelor’s thesis is proposal of implementation of the ICT Security Management to the specific Highschool in the Moravian-Silesian region. Introduction part describes the school building and current Security Management. In the practical part of this thesis are then discussed the shortages in the Highschool. This is done mainly from the perspective of security mechanisms used and the behavior of users and administrators. There are also proposals how to deal with this situation in this work.
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Suggestions for Reduction of Unemployment in the District of Vyškov
Švehlová, Renata ; Mgr.Bc.Přemysl Král (referee) ; Mikulec, Luděk (advisor)
My diploma thesis points to unemployment as a serious economical and social problem. It deals with unemployment in Vyškov region. It analyses unemployment from the point of view of various groups of job applicants and focuses on the risk and endangered people whose using in the employment markets is negligible. Some recommendations and remedies, which could contribute to a reduction of unemployment in Vyškov region, are suggested on the basis of the analysis.
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Evaluation of energetic byproducts via selected ecotoxicity tests
Král, Petr ; Modlitbová, Pavlína (referee) ; Zlámalová Gargošová, Helena (advisor)
The topic of bachelor thesis is the study of ecotoxicity of energetic byproducts generated from the power industry. The theoretical part is focused on current problems concerning waste ecotoxicity testing namely on needs of ecotoxicity testing not only in terrestric but also in aquatic arrangement. In practical part selected energetic byproduct were evaluated via Acute toxicity test and Avoidance test on soil organism earthworm (Eisenia fetida) and Plant root growth inhibition test on letuce and onion (Lactuca sativa a Allium cepa). Luminescent bacteria test on Vibrio fischeri was also used. Obtained results served for evaluation of potential ecotoxicity of energetic byproducts discussion. It was found that test in contact arrangement is very important for complex evaluation of negative effects of matrices entering the ecosystem. Also the importance of test on luminescent bacteria Vibrio fischeri is not negligible, because provides additional information of effects on representatives of destruents as an important ecosystem function part.
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Absorption of gaseous pollutants on membrane contactors
Král, Petr ; Dohnal, Mirko (referee) ; Svěrák, Tomáš (advisor)
The diploma thesis is devoted to the separation of a pollutant (NH3) from a water solution using an experimental technology device - membrane contactor. The theoretical part is mostly focused on the recent progress in the field of membrane contactors. The theoretical part also contains theory of absorption, chemisorption and microreactions, which is needed to understand the subject properly. The experimental part focuses on the construction of the experimental device and what does experimental device consist of. The efficiency of the device in transfer of ammonia to an nitrate salt of nitric acid solution was tested. At the end, experimental data are further discussed.
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