National Repository of Grey Literature
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Synthetic Fuels as Hope for Internal Combustion Engines
No full textThis bachelor thesis deals with synthetic fuels as a potential replacement for conventional fossil fuels for internal combustion engines. The thesis provides an overview of the production technologies of synthetic fuels with a focus on their use as fuels. It also analyses and compares the properties of synthetic and conventional fuels, considering chemical composition, environmental impacts and technical compatibility. The work also includes an assessment of the prospects for further development of synthetic fuels and the possibilities of their real deployment in practice. The results show that, with the use of renewable resources and modern technologies, synthetic fuels can represent an environmentally sustainable alternative to current fuels
Proposal of Recommendations for Outdoor Advertising Media of Selected Restaurants
No full textThe diploma thesis focuses on the proposal of recommendations for the effective use of outdoor advertising media in selected restaurants in Brno and its surroundings. The thesis is divided into three main parts. The theoretical part introduces key concepts in the field of marketing and advertising with a focus on outdoor forms of communication. The analytical part is devoted to the characteristics of the selected restaurants, description of their current advertising tools and evaluation of data obtained through qualitative research in the form of semi-structured interviews. Based on the results of the thematic analysis and the evaluation of the effectiveness of individual advertising media, the third, design part formulates specific recommendations leading to the improvement of the visibility and effectiveness of outdoor advertising in order to increase the attractiveness of restaurants for the target group
Microfluidic chip for mechanical stimulation of adherent cell cultures
No full textPredkladaná dokumentácia slúži ako návod pre výskumníkov na prípravu mikrofluidného zariadenia určeného na naťahovanie adherentných bunkových kultúr v open-source formáte. Dôraz sa kladie na dostupnosť a jednoduchosť výroby, pričom zariadenie umožňuje reguláciu napätia v dvoch osiach pri biologicky relevantných rýchlostiach. Zariadenie je navrhnuté s ohľadom na možnosť paralelizácie, aby sa umožnilo jeho využitie v aplikáciách s vysokou priepustnosťou. Okrem toho je na základe literatúry navrhnutý matematický model naťahovania buniek, ktorý overuje realizovateľnosť počiatočného návrhu. Konštrukcia mikrofluidného zariadenia zodpovedá najnovším trendom v oblasti výskumu a súčasťou práce je aj prehľad literatúry. Zariadenie je testované z hľadiska odolnosti, biokompatibility a funkčnej relevantnosti v mechanobiologických aplikáciách. Výsledky zariadenia sú porovnané s existujúcimi komerčnými riešeniami
Mikhailov stability criterion for selected continuous and discerte-time LTI systems
No full textThis thesis deals with the stability of linear time-invariant (LTI) systems. The aim of the thesis is to derive Mikhailov’s stability criterion and its modifications for different types of LTI systems. The derived results are demonstrated with selected illustrative examples. Due to the geometrical character of the Mikhailov criterion, these examples are complemented by a graphical representation of the Mikhailov curve in the complex plane. From these visualizations, one can decide on the stability of the relevant systems without having to compute the roots of the characteristic polynomial
The project of 6kV switchgear without SF6 gas
No full textThe aim of the bachelor's thesis is to become familiar with the work of a design engineer. The thesis focuses on the practical development of a study for the reconstruction of a high-voltage substation in an industrial facility. The theoretical part of the thesis presents basic information about switching equipment. At the beginning of the practical section, the current state of the SF switchgear is described, along with important information for proposing a new switchgear solution. The subsequent part of the thesis is practically dedicated to the design of an air-insulated switchgear
Neural Networks: Experimentation with Activation Functions
No full textAktivační funkce jsou nezbytnou součástí neuronových sítí a je důležité s nimi experimen- tovat, abychom hledali výhody a nevýhody těchto konkrétních funkcí. V této práci se zabýváme základními koncepty neuronových sítí, abychom pochopili celý koncept, a poté se zaměříme na různé aktivační funkce a analyzujeme jejich dopad v neuronových sítích. Ve druhé části práce experimentujeme s funkcemi Sigmoid, Tanh, ReLU, GELU, ELU a Swish v konvolučních neuronových sítích a autoenkodérech v oblasti detekce anomálií. Používáme datovou sadu Yahoo S5 a poté modifikované datové sady CIFAR-10 a MNIST. Nakonec se podíváme na výsledky experimentů s uvedenými aktivačními funkcemi, které ukazují, že moderní aktivační funkce (např. Swish, ELU, GELU) mají často lepší výkon než klasické funkce, jako je Sigmoid a Tanh, a to díky hladšímu zpracování gradientů a konkrétně přede- vším lepšímu zvládání problému zvaný vanishing gradient
The effect of hydrogen on the properties of materials used in turbochargers
No full textThis bachelor's thesis investigates the influence of gaseous hydrogen on the properties of spheroidal graphite cast iron (EN-GJS 400-15), a material commonly used in the production of turbocharger components for internal combustion engines. The goal of the thesis is to evaluate the behavior of this material when exposed to a hydrogen environment under elevated temperature and pressure conditions that simulate real operating states. The thesis includes a literature review covering turbocharger design variants, the impact of fuel quality and composition on their operation, and the materials used for their key components. Furthermore, it explores hydrogen's effect in terms of its penetration into materials and models of hydrogen embrittlement. The experimental part focuses on evaluating the properties of three groups of samples prepared from a turbocharger insert. These samples were tested using mechanical testing, as well as fractographic and metallographic analysis
Technical Conditions of Tender Documentation between the Czech Republic and Selected EU Countries
No full textThis bachelor’s thesis focuses on the analysis of technical conditions in the tender documentation for public construction contracts in selected member states of the European Union – the Czech Republic, Austria, and Germany. The aim of the thesis is to compare the approaches of these countries to the formulation of technical conditions and to identify differences in their interpretation. Through content analysis of actual tender documentation and the relevant national and EU legislation, both formal and substantive aspects of the technical specifications were examined, with particular attention to project documentation and bills of quantities. The findings contribute to a better understanding of the public procurement process and highlight key differences in how technical specifications are structured in the Czech Republic, Austria, and Germany. These variations may affect the potential for cross-border participation of suppliers within the EU single market
Design, Optimization, and Testing of a Trading Strategy for Futures Markets
No full textThis bachelor's thesis focuses on the design, optimization, and testing of an algorithmic trading strategy in the crude oil futures market. The theoretical part highlights key areas related to financial markets, algorithmic and discretionary trading, including strategy testing methods and potential errors in the development process. The practical part is dedicated to analyzing market characteristics, followed by the design and testing of a trading strategy on a selected futures market
Privacy Protection in Shared Transportation
No full textTato diplomová práce se zaměřuje na zabezpečení dat a ochranu soukromí v inteligentních dopravních systémech (ITS), se zvláštním důrazem na služby sdílených vozidel. Teoretická část poskytuje přehled o ITS a typech sdílené dopravy, a rovněž popisuje bezpečnostní výzvy v této oblasti. Dále se věnuje technologiím pro ochranu soukromí, jako jsou například skupinové podpisy a atributová schémata. Hlavním přínosem je návrh a demonstrační implementace systému pro anonymní bezklíčový přístup k vozidlu využívající schématu skupinového podpisu KLAP20. Systém umožňuje anonymní přístup k vozidlu bez nutnosti fyzického klíče, a zároveň podporuje identifikaci pomocí mechanismu revokace. Součástí práce byla také bezpečnostní analýza, která zhodnotila celkovou úroveň zabezpečení navrženého systému