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Rhodium in the environment
Ondreášová, Klára ; Nevrlá, Jana (referee) ; Komendová, Renata (advisor)
This bachelor thesis focuses on the characteristic of rhodium, its use in the automotive industry, the occurrence in environmental compartments (air, soil, vegetation, water), accumulation and transformations. In this thesis there are also described methods of sampling for determination, the types of sample preparation, separation and preconcentration techniques necessary prior to instrumental analysis. The work also focuses on the most commonly used analytical methods of rhodium determination, which are spectrophotometric methods, AAS, ICP-AES and ICP-MS.
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Development of exchange rate regime and policy in the Czechoslovak republic between two World Wars
Němečková, Šárka ; Kalínská, Emílie (advisor) ; Lukáš, Zdeněk (referee)
The goal of this diploma work is to evaluate the process and form of determination for czechoslovak crown's exchange rate at beginning of the autonomous Czechoslovak republic and consequential implementation of monetary policy according to the development of economic situation until the beginning of the Second World War. At first I will aim to outline initial economic and monetary situation in the Czech countries before the Austria-Hungary empire break-up. The main focus of the whole work is the monetary reform in the Czechoslovak republic in 1919 whose creator was Alois Rašín. Consequently I will focus on formation of the Czechoslovak monetary policy and monetary stabilization until the world economic crisis. The important step in this period was the foundation of the autonomous emissive bank, which should have strengthened the confidence of currency and separated monetary policy from political interests. The start of the world economic crisis caused breakdown of all economics including the czechoslovak one. Due to this situation I would like to focus also on consequences of the crisis and the solutions suggested by Karel Engliš. At the end of this diploma work I would like to describe the final years of independence of the czechoslovak monetary policy before occupation and the Second World War.
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Calculation of residual fatigue life of railway set
Náhlík, Luboš ; Hutař, Pavel ; Knésl, Zdeněk ; Matušek, P.
The calculation of residual fatigue life of railway set is described in the contribution. The initial defect is modeled as a semicircular crack, which propagates preferentially in normal mode of loading perpendicularly on the axis of the axle. The conservative approach based on linear elastic fracture mechanics was chosen for residual fatigue life prediction. The aim of calculation is to determine number of loading cycles, which permits safe run of the railway axle, i.e. the dependence of crack depth on number of loading cycles for given loading spectrum.
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Manufacturing of mudguard holder using forging technology
Ondráček, Miroslav ; Podaný, Kamil (referee) ; Šlais, Miroslav (advisor)
The diploma thesis deals with problems of drop forging. A detailed literary study is prepared in this work, in which there are data for working out the specified component – mudguard holder. There are options for cutting the semi-product, types of lubricants, construction of ideal preform or different kinds of forging machines for drop forging. The next part of this thesis is about technology of drop forging on crank forging presses. This section is aimed on technical drawing of the forging and its classification by the complexity of the shape. Furthermore, the thesis deals with the economic part, setting out the individual costs of the production from which the cost price of a forging is determined.
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Kritické faktory efektivní podpory MSP ze zdrojů EU v kulturním a kreativním sektoru
Mlejnková, Pavla
The thesis deals with finding the critical factors of effective support for small and medium-sized enterprises that gain finance from funds from the European Union. There are mentioned the theoretical basis for processing this thesis in the litera-ture review. In this thesis, there is evaluated financial situation of the companies involved in the subsidies from the European Union belong to period 2007-2013 via the MEDIA program (Development). These companies are firstly examined by relevant financial analysis. Consequently, the output of selected companies is determined using the indicator of economic value added EVA INFA. Obtained values of indicators are compared with sector values through benchmarking diagnostic system of financial indicators INFA and then statistically verified. The main objective of this thesis is to identify these critical factors by using questionnaire and by available literature sources. Based on these results, recommendations are made and the critical factors are determined.
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Propagation of inclined cracks to the interface of ceramic laminates
Novotná, Lenka ; Trunec, Martin (referee) ; Chlup, Zdeněk (advisor)
Composite materials with laminated structure provide advantages which are utilised during component design. Low density, temperature and chemical stability are the profitable properties predetermining application of ceramic laminates. The main obstacle for wide spread of ceramic materials is their inherent brittleness. Therefore, in this thesis, the crack propagation in ceramics laminates has been extensively studied. Laminated structures with various volume fractions of components (alumina and zirconia) were prepared by electrophoretic deposition. Evaluation of crack propagation through the interface and determination of basic mechanical properties was conducted on the basis of extensive literature search. Crack deflection originated in both presence of internal stresses and differences in elastic modulus during the crack interface passing was monitored. A special type of specimen geometry was employed with the aim to set arbitrary angle between crack and interface. It was experimentally found that the degree of crack deflection is dependent on entering angle and volume fraction of components. Higher crack deflection was already found in the bulk of the test piece comparing to the test piece surface. The 3D fracture surface reconstruction generated using laser confocal microscopy was used in this detailed crack propagation study. Further basic elastic and strength characteristics of laminates were determined and compared to those obtained from monolithic materials. The validity of the mix rule for elastic characteristics was confirmed by comparing of elastics modulus. The most reliable method for elastic modulus determination was marked the dynamic resonance method due to low scatter and consistency in measurement. The flexural strength of all laminates tends to be close to the flexural strength of the weakest component. Therefore the mix rule is not applicable for flexural strength estimation on the contrary of elastic characteristics. The change of component volume fraction leads only to change of flexural strength scatter. Thanks to gained knowledge about crack propagation and basic characteristic determination will be possible to design ceramic laminates more efficiently for given needs of application.
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Monitoring of the tin release to the canned fruit from the used packaging
Flajs, Roman ; Vránová, Dana (referee) ; Diviš, Pavel (advisor)
This master’s thesis deals with the issue of the release of tin in canned fruit of used packaging. The theoretical part of the thesis is described canning fruit as raw material, its composition, methods of preservation, basic technological operations fruit processing, manufacture of compote, manufacture of metal packaging, marches corrosive metal packaging, chemical behavior of tin in foods and toxicity, methods for the determination of tin in foods with a focus on optical emission spectrometry with inductively coupled plasma. I the experimental part of the thesis was first ICP-OES optimized before to analysis of the 20 different samples compote purchased in chain stores. Tin concentration was determined by a fixed proportion compote. Measured concentration of tin were compared with the maximum permissible value in canned foods, which is allowed by European legislation. The tin content in all analyzed compote did not exceed the legislative limit of 200 mg/kg. The highest concentration of tin has been measured in sample conserved apricots namely 88,6 ± 2,8 mg/kg.
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Reliability assessment of bodies with general singular stress concentrator
Klusák, Jan
The paper presents a method leading to reliability assessment of bodies with general singular stress concentrator. The method uses combination of analytical and numerical procedures to determine fracture-mechanics parameters. The approach is based on comparison of fracture behaviour of body with a crack and a body with a general singular stress concentrator. The goal of the paper is to determine value of applied stress that leads to initiation of failure of construction.
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