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Determination of the chemical composition of a brass sample by X-ray fluorescence method
Tomanová, Michaela ; Čudek, Pavel (referee) ; Vaněk, Jiří (advisor)
The fluorescence spectroscopy method is used to distinguish components in gas, liquid, or solid samples. The study is based on the parameters of secondary radiation, which is emitted by each element and allows them to be identified. The distinction between each radiation is analogous to a fingerprint. Apart from quantitative and qualitative analyses, the method can be used to determine the thickness of metal layers and alloys. Laboratory analysis has a broader range of application than portable devices, which are also available. In the laboratory, two methods of measurement are available: wavelength dispersive fluorescence spectroscopy – WDXRF and energo dispersive fluorescence spectroscopy – EDXRF. A brass sample with lead additive was analyzed using EDXRF in the practical part of this diploma thesis. An X-ray apparatus from the Leybold company was employed for the analysis, which will be used for education of lower grades at the university. A measurement station and a laboratory assignment were developed as part of the thesis, the aim of which will be to determine the chemical composition of a brass sample using the X-ray fluorescence method.
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Design of a photovoltaic power system with battery storage for household purposes
Polášek, Radek ; Vanýsek, Petr (referee) ; Vaněk, Jiří (advisor)
Cílem této práce je představit základy a funkční principy fotovoltaiky a fotovoltaických systémů, tak aby mohly být následně použity k návrhu fotovoltaického energetického systému na rodinném domě. První část práce se zaobírá právě teoretickým úvodem do tématu fotovoltaiky a představením jednotlivých komponentů, kterých je při návrhu fotovoltaického systému potřeba.Druhá část práce se poté zaobírá designem a simulacemi fotovoltaických systémů v několika variantách a také režimech připojení. Nejprve se jedná o systém ostrovní, jehož primárním cílem je v tomto návrhu kompletní pokrytí spotřeby domácnosti. Ačkoliv úroveň spotřeby není pro vybranou domácnost nijak vysoká, dosáhnutí kompletního pokrytí vyžaduje velmi značnou investici do vybavení systému, nad rámec běžného návrhu, zejména kvůli problematickým obdobím s nízkou úrovní slunečního záření. Ve výsledku se tedy návrh ostrovního systému ukazuje jako nedostatečný a to i po uvážení a rozboru jeho modifikovaných verzí. Alternativou ostrovního systému je v našem případě systém hybridní, který narozdíl od první varianty řešení, umožňuje také připojení k síti a v době nízké generace energie, může být suplementován dodávkou právě z ní. Po představení principů hybridního systému a rozboru případných finančních dotací a prodeje přebytků, následují jednotlivé návrhy hybridních systémů, kde každý z nich má vlastní zaměření. Jako první byl nasimulován návrh s co možná nejmenší pořizovací cenou, využívající zároveň tarifu virtuální baterie, která umožňuje díky přetokům levnější čerpání elektřiny ze sítě, když je tomu třeba. Po finanční analýze se systém sice ukázal jako levný, avšak potenciální výtěžek z něj a zhodnocení investice již nebylo tak slibné Druhá varianta hybridního systému byla zamýšlena jako pomyslný střed mezi minimálním a maximálním provedením. Jedná se o kompletní pokrytí jedné střešní plochy s adekvátní baterií. Takovýto systém navíc využívá prodeje přebytečné elektřiny na trhu. Díky vysoké úrovně dotace a také prodeji přebytků, slibuje finanční analýza tohoto systému relativně rychlou návratnost investice, která dál postupně roste v porovnání s variantou bez jakéhokoliv fotovoltaického systému. Třetí systém byl zaměřen na maximální využití vhodných střešních ploch velikostního rozsahu pro mikrozdroje do 10 kWp instalovaného výkonu. Negativem takovéto varianty je vyšší pořizovací cena, avšak odhadovaná návratnost dosahuje značně vyšších úrovní než u předchozích systémů. V poslední části byla provedena multikriteriální analýza s cílem určit nejvhodnější řešení systému, dle přesnějších požadavků majitelů daného rodinného domu. Vyhodnocení této analýzy ukázalo jako nejvhodnější třetí variantu, a to s podílem 47.6%.
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Monitoring of air flow around photovoltaic modules
Herman, Michal ; Křivík, Petr (referee) ; Vaněk, Jiří (advisor)
This diploma thesis deals with the flow of air around photovoltaic modules and the associated effect on their temperature and overall performance. In the thesis, a device for sensing the mentioned quantities is designed and it is compared with similar types of devices in terms of price, dimensions and accuracy. Furthermore, the thesis describes the placement of individual sensors and sensing interval of quantities. In the second part of the thesis, long-term stored data are plotted in graphs and the extend to which they affect the photovoltaic system is evaluated.
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Inovation of a photovoltaic power system with battery storage
Pallová, Ivana ; Jandová, Kristýna (referee) ; Vaněk, Jiří (advisor)
This diploma thesis is focused on the Innovation of the existing power plant with battery storage. In the theoretical part, the individual parts of the photovoltaic power plant are introduced, the principle of operation of the photovoltaic cell and the individual types of these cells are desribed. The work also deals with the description of the existing photovoltaic power plant and their components. Subsequently, a battery systém and otherpossibilities of Innovation with the possibility of a subsidy and without it are designed. In the final part, the most advantageous solution is evaluated according to the performes simulations.
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Hypodermic and drainage runoff
Hubinger, Lukáš ; Datel, Josef (advisor) ; Vaněk, Jiří (referee)
The BSc thesis deals with hypodermic and drainage runoff, possibilities of its determination, with its place in the hydrologic cycle and impacts of anthropogenic activities. There are types of runoff, possibilities of its description one by one in the thesis. The thesis also includes information about agricultural drainage, its influence to the landscape as whole, types of drainage, about advantages and disadvantages of drainage systems and about actual situation of drainage systems in the Czech Republic. There are description in detail pluses and negatives drainage runoff in the thesis, there are description possibilities of its modernization, about actual situation of drainage systems and it is influence to the landscape.
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Nitrogen and its transport in natural waters
Hrubá, Jolana ; Datel, Josef (advisor) ; Vaněk, Jiří (referee)
This thesis is literature search dealing with the nitrogen present in natural waters and its impact on aquatic ecosystems. Another described issue is the origin of nitrogen in natural waters, and possible ways of eliminating its concentration, including wastewater treatment. This work can be used for practical research as a literature review of the issue and ways of its solution.
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The most frequent techniques classified on international competitions.
Vaněk, Jiří ; Štěpánek, Jan (advisor) ; Brož, Josef (referee)
Titul: The most frequent techniques classified on points on intemational competitions Aim of thesis: Determine the most frequent techniques classified on points on intemational competitions. Selection of three the most frequent techniques, description and taking pictures oftheir fighting variations. Method: Analysis oftechnique realised by process of observation, interview, illustrative and documentary records. Result: The most frequent techniques classified on points are kata-guruma(22%), te- guruma(1 5,2%} a kosiki-taoshi(14,5%). 3
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Principles of fun in Collectible Card Games and their Influence on the Players Life
Vaněk, Jiří ; Tuček, Milan (advisor) ; Martinová, Marta (referee)
The bachelor thesis Principles of fun in collectible card games and their influence on the players life is about a hobby game discipline called Collectible Card Games or Trading Card Games. Basic rules of collectible card games are described in the introduction. Theoretical block describes game in a different way, than people usually thought about it. Important part of thesis is empirical research which conducted in March 2014. This research was performed using the method called interview with manual which belongs under the qualitative methods. Research is focused on long- term Magic the Gathering players and took place in Prague game centre. Results of this research are divided to two major sections. First section is Fun and collectible card games and second section is Influence of community on player's life. First section is focusing on what is fun about gaming, why competition is important, factor of luck in games and what having a collection means for them. Second section is about relationship between the players, formation and maintenance of community and also about traveling and friendship. Whole research procedure is summarized in conclusion. Also, there are several ideas arising from the answers of the interviewed informants.
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Bone Augmentation Materials Evaluation of Implant Osteointegration
Moztarzadeh, Omid ; Hrušák, Daniel (advisor) ; Vaněk, Jiří (referee) ; Pazdera, Jindřich (referee)
Bone Augmentation Materials Evaluation of Implant Osteointegration This dissertation thesis contains a description and results of six constituent studies. The first study was performed in order to investigate the most common indications for the use of three bone augmentation materials, Biogen, Cerasorb and Bioresorb. The most common indications identified were based on statistical data collected from patients treated at the Maxillofacial Surgery Department, Faculty Hospital in Pilsen, during 2003-2007. The second experiment was performed in vivo. We evaluated the possible osteoinduction potential and osteogenic activities of two different bone augmentation materials (Cerasorb, Biogen) by examining whether ectopic bone formation could be induced when implanted subcutaneously into the extremities of our test subjects (pigs). The results obtained, highlight the potential future use, of augmentation materials in creation of hard tissues, in areas where soft tissues are normally present. The third experiment was performed in order to evaluate the efficiency of Cerasorb bone augmentation material in bone healing. Cerasorb was applied into an artificial hole in the extremities of the test subjects and based on careful analysis of the radiographic and histological images, we found that Cerasorb gradually resorbed...
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