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Acceleration of calculations in life insurance
Kuzminskaya, Kseniya ; Janeček, Martin (advisor) ; Vitali, Sebastiano (referee)
One of the major issues in practical calculation in life insurance - typically value of liabilities, value of the company, pricing,... - is that the calculations run times are very long. This work should investigate possible approaches how to speed up the calculation (cluster analysis, flexing,...). If the results are positive, it can have crucial practical applications 1
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Regulation of consumer credit
Janeček, Miroslav ; Kohajda, Michael (advisor) ; Vybíral, Roman (referee)
Regulation of consumer credit Abstract (English) Consumer credit is a legal institute and an economic instrument that allows consumer to pay funds that he does not currently have, when purchasing goods or services. Its importance is significant in the consumer society, so its provision and distribution must be regulated. Paragraph 2 of the current Consumer Credit Act No. 257/2016 Coll. defines consumer credit as a deferred payment, a cash loan, credit or similar financial service provided or intermediated to the consumer. The subject of this rigorous work is the analysis of the current regulation of consumer credit in relation to the adoption of the new Act No. 257/2016 Coll., On Consumer Credit, which implements the Directive 2014/17/EU of the European Parliament and of the Council of 4 February 2014 on credit agreements for consumers relating to residential immovable property. The legislator decided to consolidate the regulation of consumer credit into one rule, so the new act also implements the Directive 2008/48/EC of the European Parliament and of the Council of 23 April 2008 on credit agreements for consumers. The new act thus represents a complex regulation covering both the provision and intermediation of consumer credit and the rights and obligations arising from mortgage credit agreement and...
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Morphology and hardness of particles of titanium powder prepared by cryogenic milling
Ibragimov, Ilya ; Stráský, Josef (advisor) ; Janeček, Miloš (referee)
The effect of cryogenic milling on morphology and microhardness of titanium powder was investigated. Initial powder of commercially pure titanium was subjected to cryogenic milling in liquid argon (LAr) using two different milling speeds. Prepared powders were subsequently cleaned by ethanol. The cleaning procedure was done in two ways: in the air and in the inert atmosphere in the glovebox. Particle size and morphology were investigated my scanning electron microscopy and subsequent automated image analysis. Microhardness of powder particles was determined by Vickers hardness measurement using small loads. The milling did not cause significant powder refiniment, while the shape of powder particles changes substantially. Milling speed affected particle shape and powder contamination. Application of stearic acid as the processing control agent prevented cold-welding of powder particles, but contaminated the powder by oxygen and hydrogen. Stearic acid could be successfully removed by cleaning in ethanol. The using of glovebox for cleaning did not have significant effect on the resultiing contamination.
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Structure analysis of some transition metal silicides using X-ray diffraction and dynamical refinement against electron diffraction data
Antunes Corrêa, Cinthia ; Janeček, Miloš (advisor) ; Kalvoda, Ladislav (referee) ; Kužel, Radomír (referee)
Title: Structure analysis of some transition metal silicides using X-ray diffraction and dynamical refinement against electron diffraction data Author: Cinthia Antunes Corrˆea Department: Physics of Materials Supervisor: prof. RNDr. Miloš Janeček, CSc., Department of Physics of Materials Abstract: This thesis presents the crystal structure analysis of several transition metal silicides. The crystal structures were studied primarily by precession electron diffraction tomography (PEDT) employing the dynamical refinement, a method recently developed for accurate crystal structure refinement of electron diffraction data. The optimal values of the parameters of the method were proposed based on the comparison between the dynamical refinement of PEDT data and a high- quality reference structure. We present the results of the comparison using a Ni2Si nanowire with the diameter of 15 nm. The average atomic distance between the model obtained by the dynamical refinement on PEDT data and the one by single crystal X-ray diffraction was 0.006 ˚A. Knowing the accuracy and limitations of the method, the crystal structure of Ni3Si2 was redetermined on a nanowire with 35 nm of diameter. The model obtained had an average error in the atomic posi- tions of 0.006 ˚A. These results show that the accuracy achieved by the dynamical...
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Acceleration of calculations in life insurance
Kuzminskaya, Kseniya ; Janeček, Martin (advisor) ; Vitali, Sebastiano (referee)
One of the major issues in practical calculation in life insurance - typically value of liabilities, value of the company, pricing,... - is that the calculations run times are very long. This work should investigate possible approaches how to speed up the calculation (cluster analysis, flexing,...). If the results are positive, it can have crucial practical applications 1
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Real Convergence of Economies and their Disruption of Economic Crisis
Janeček, Michal ; Bartošová, Jitka (advisor)
The bachelor thesis examines the impact of the economic crisis on the real convergence of the Czech Republic and the other states of the Visegrad Group towards the states of the European Union. The beta and sigma convergence methods were used to determine whether real convergence was taking place. For these purposes, three models were created, all EU members without the excluded Ireland and Luxembourg due to their extreme values (EU-26), the Czech Republic and the original EU member (EU-13) and the Visegrad Group and EU-13. Each model was further divided into pre-crisis and post-crisis periods. In the pre-crisis period beta-convergence was demonstrated in the EU-26 group, V4 and EU-13 group and sigma-convergence was demonstrated in the EU-26 group. In all other cases, the result of the analysis was ambiguous. After the crisis, the results of the analyses in all groups were ambiguous.
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Interest Rate Models - Practical Aspects
Hakala, Michal ; Janeček, Martin (advisor) ; Sitař, Milan (referee)
Topic of the master thesis is practice of interest rate models. Literature dedicated to the interest rate models usually presents theory in very general form. Theory presented in general form leads to a gap between theory and practice. Author tries to fill this gap. Thesis describes basic theory and presents practical computations, which are relevant to generating interest rate scenarios. Contribution is given by derivation of formulas and computational methods in form directly applicable for implementation of presented models. It is common practice to validate quality of interest rate scenarios. Author presents several tests and implements them in programming language Python. Tests are implemented as application with graphical user interface.
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Metastable beta titanium alloys for biomedical use
Preisler, Dalibor ; Stráský, Josef (advisor) ; Janeček, Miloš (referee)
In this work the effect of die-forging and annealing on the mechanical properties and microstructure of biocompatible metastable alloy Ti-35.3Nb-7.3Zr -5.7Ta-0.7O (wt. %) was studied. Light and scanning electron microscopy, microhardness tests and tensile tests were used to study all prepared conditions. As-cast and as-annealed conditions showed chemical inhomogeneities exhibited as dendritic structure, grains with size of hundreds of micrometers and numerous pores having size of units of micrometers. Precipitation of alpha phase particles was negligible in as-annelaed conditions and only grain boundary alpha paticles formed. Die-forged condition showed grain sizes in the wide range of hundreds of micrometers down to micrometers. Both as-annealed and die-forged conditions showed increased microhardness compared to as-cast condition, but there were no significant differences between different annealing conditions. Yield stress of 870 MPa was found for as-cast condition while as-forged condition exhibited even higher yield stress of 1120 MPa. In both conditions, good room-temperature ductility was demonstrated. Due to its high strength, this alloy is perspective for manufacturing of joint implants.
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Physical and mechanical properties of lead-free solder joints
Harcuba, Petr ; Janeček, Miloš (advisor) ; Drozd, Zdeněk (referee) ; Očenášek, Vladivoj (referee)
Title: Physical and mechanical properties of lead-free solder joints Author: Petr Harcuba Department: Department of Physics of Materials Supervisor: prof. RNDr. Miloš Janeček, CSc., Department of Physics of Materials Abstract: Due to recent restriction of the classical Sn-Pb solder alloy, lead-free solders became an extensively investigated class of materials. This thesis focused on selected Sn-Cu based alloys. The influence of Cu content and minor additions of Ni and P on IMC layers morphology and reliability of simulated solder joints were investigated. The growth kinetics of IMC layers and mechanical properties of solder joints were studied after reaction of molten solders with Cu substrate at various times and temperatures, and after subsequent ageing at elevated temperatures. Detailed analysis of the evolution of IMC layers morphology was performed using EBSD. Higher Cu concentration in solders decreased the dissolution rate of Cu substrate. It was shown that the addition of 0.1 at.% of Ni significantly changed the morphology of IMC layers and improved mechanical properties of solder joints. Addition of P had only a minor effect on the IMC growth and the solder joint reliability. Keywords: Lead-free solders, intermetallic compound layers, growth kinetics, reliability of solder joints
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Phase transformations in modern titanium alloys
Šmilauerová, Jana ; Janeček, Miloš (advisor) ; Kalvoda, Ladislav (referee) ; Strunz, Pavel (referee)
This study deals with phase transformations in metastable β titanium alloys, focusing on the investigation of evolution of nanoparticles of thermodynamically metastable ω phase. For the purpose of this research, single crystals of two metastable β titanium alloys - LCB (Ti-6.8Mo-4.5Fe-1.5Al) and Ti-15Mo (in wt. %) - were grown in an optical floating zone furnace. It was established by differential scanning calorimetry that the phase transformations occurring in the material did not change significantly as a result of the single crystal growth process. Using single crystal X-ray diffraction, the shape and the size of ω particles were determined in a series of aged samples. The lattice parameters of ω particles and the β matrix, as well as the misfit between the two structures were calculated. The β phase was found to be locally deformed in compression around ω particles. Small-angle X-ray scattering (SAXS) experiments revealed a spatial ordering of ω particles in the β matrix in a disordered cubic array with the basis vectors along 100 β directions. The SAXS data also allowed the evaluation of the mean ω particle sizes and distances and confirmed that the ω particle growth obeys the t1/3 law following from the Lifshitz-Slyozov-Wagner theory. In situ SAXS performed during isothermal ageing at selected...
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