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Development of Dataster Tool
Vlach, Martin ; Holík, Lukáš (referee) ; Smrčka, Aleš (advisor)
This bachelor thesis deals with expansion of existing web application Dataster in Testos platform. This application serves as a user interface for dbgenx tool from the same platform. The main purpose of Dataster is a user-friendly generation of randomized structured data which are used as a database test content. The first goal of this bachelor thesis was, in particular, to extend dbgenx tool with the possibility of generating test data according to the coverage criteria of combinatorial testing. An existing tool Combine from Testos platform has been selected for this purpose. The other part of the thesis deals with a number of small adjustments and expansion of Dataster web application, for a improvement of usability and overall user-friendliness of this application.
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Systém pro podporu zajištění kvality při vývoji software
Vlach, Martin
The thesis deals with the design and implementation of a web application to support software team in ensuring the quality of software products. The application provides users with possibilities to create projects, requirements, risks, test cases and relationships between them. The main benefits of the application includes a wide range of customisations for demands of a specific project. The application consists of several services that run in a Docker environment. Client part of the application is implemented in TypeScript using frameworks Vue.js and Quasar.js. The server side of the application is implemented in Python using modern framework FastAPI.
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Phase transformations in aluminium AlEr(Sc)-based alloys
Leibner, Michal ; Vlach, Martin (advisor) ; Minárik, Peter (referee)
The effects of Sc addition, different Er concentrations and deformation on phase transitions in Al(-Sc)-Er-Zr alloys were studied. Three distinct processes were identified during isochronal annealing in all of the alloys investigated. The first process with maximum at ~ 240 řC is probably related to clustering of Er or to clustering of Er and Sc atoms, respectively. This effect was more pronounced in the deformed alloy due to easier diffusion of solutes along dislocations and (sub)grain boundaries. The second process with a maximum around 360 řC stems from the formation of Al3Er or Al3(Er,Sc) particles, respectively. This effect was more pronounced and led to a more significant hardening in the Sc-containing alloy. The third process is most likely related to the formation of Zr-rich shell around the previously formed precipitates. After aging at 600 řC, precipitates with a core made of Al3Er phase and a shell made of Al3(Er,Zr) phase were observed in the Al-Er-Zr alloy.
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Phase transformation in magnesium MgZnAl-based alloys
Kodetová, Veronika ; Vlach, Martin (advisor) ; Mathis, Kristián (referee)
In the present work, there was analyzed thermal evolution of the phase transformation in the MgZnAl and MgZnAlCa alloys with different concentration of the Zn and Ca. The grains were occupied by the phase with quasicrystaline icosaedral structure in the as-cast alloys and after isochronal annealing up to 240 řC. The thermal measurements revealed two exothermic effects in the MgZnAl alloy and three exothermic effects in the MgZnAlCa alloy during linear heat treatment in the temperature range of 100 - 250 řC. In agreement to the thermal response, two and three stages of electrical resistivity decrease were observed in the same temperature range. The lower thermal changes, absolute resistivity changes and microhardness were observed in the alloy with Ca-addition and lower concentration of Zn.
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Hydrogen-induced defects in titanium
Knapp, Jan ; Čížek, Jakub (advisor) ; Vlach, Martin (referee)
Titanium is a very important industrial material with quite a versatile use. This thesis examines the influence of hydrogen absorbed in metal lattice of titanium on defects inside the lattice. In this work titanium samples were loaded with hydrogen using two different methods: electrochemical charging, where titanium sample was immersed in solution of H3PO4 and glycerin as a cathode. The anode was be made of platinum and constant electrical current in order of miliampers was run throw the solution. The H+ cations went to the cathode and were neutralized to a hydrogen atom there. The hydrogen atoms subsequently penetrated into the titanium lattice by diffusion. Gas loading was used as the second method of hydrogen doping. Titanium samples were put into hydrogen atmosphere with defined pressure and kept at constant temperature. Hydrogen loaded samples were examined by positron lifetime spectroscopy which represents a non-destructive technique for studying defects in materials. Analysis of phase composition was performed by X- ray diffraction. Developments of mechanical properties of hydrogen loaded samples were monitored by Vickers micro-hardness testing. Differential Scanning calorimetry was employed for investigation of thermal stability of absorbed hydrogen.
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Phase transformation in bio-compatible Mg-based alloys
Hornát, Bohumil ; Vlach, Martin (advisor) ; Mathis, Kristián (referee)
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Influence of deformation on precipitation processes in commercial Al-based alloys with Sc,Zr-addition
Leibner, Michal ; Vlach, Martin (advisor) ; Cieslar, Miroslav (referee)
1 Abstract: Mechanical and thermal properties of Al-5.4wt.%Zn-3.1wt.%Mg-1.5wt.%Cu (AA- 7075), Al-5.2wt.%Zn-3.0wt.%Mg-1.4wt.%Cu-0.2wt.%Sc-0.1wt.%Zr (AA-7075-ScZr) and Al-2.93wt.%Mg-0.34wt.%Mn-0.33wt.%Si-0.22wt.%Fe-0.19wt.%Cr-0.24wt.%Sc-0.06wt.%Zr (AA-5754-ScZr) alloys in as-cast and cold-rolled states were studied by differential scanning calorimetry and microhardness measurements. The initial values of microhardness reflect an effect of cold-rolling. The Sc,Zr-addition caused a pronounced hardening during annealing above ~ 300 řC. An easier diffusion of Zn, Mg, Cu and Mn atoms along dislocations led to a precipitation of Zn,Mg,Cu-containing and Mn-containing particles at lower temperatures in comparison with the AA-7075(-ScZr) and AA-5754-ScZr alloy in the as-cast state, respectively. The Sc,Zr-addition does not significantly influence precipitation of the particles form the Al-Zn-Mg-Cu system.
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Study of free volumes in Nafion using positronium
Košinová, Lucie ; Čížek, Jakub (advisor) ; Vlach, Martin (referee)
Title: Study of free volumes in Nafion using positronium Author: Lucie Košinová Department: Department of Low-Temperature Physics Supervisor: doc. Mgr. Jakub Čížek, Ph.D., Department of Low-Temperature Physics Abstract: The object of this thesis is investigation of the absorption of water in Nafion and the influence of temperature on the absorption and desorption kinetics. Study of the absorption and desorption of water was carried out either measurement of changes in the macroscopic physical properties of Nafion (weighing, differential scanning calorimetry) either by microscopic characterization of the size distribution of free volume that arises as a consequence of an imperfect arrangement of polymer chains. For this purpose I used a non- destructive method used positron annihilation spectroscopy, which is currently the only technique capable of determination of the size distribution of free volumes having the free volume distribution by size of a few Å. The development of the size distribution and the concentration free volumes in the sample were determined on the based on the measurement of lifetime spectra of positrons annihilating in the sample of Nafion. The results obtained in this thesis can be further used in research of Nafion, which is widely used as a semipermeable membrane during industrial...
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