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The influence of a pre-print thick layer paste viscosity on forming of layer
Ondráček, Michal ; Švecová, Olga (referee) ; Klíma, Martin (advisor)
This bachelor thesis deals with the theory of thick film technology and applying these layers. The work also includes basics of liquid rheology, methods of measurement viscosity and ways of mixing liquids. The main aim is to determine the influence of viscosity of thick film pastes for printing quality of the test structure using screen printing, in particular its flatness and sharpness. The aim is also measure the dependence of viscosity thick film pastes on mixing time.
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Creating themes thin-film methods
Ondráček, Michal ; Šimonová, Lucie (referee) ; Šubarda, Jiří (advisor)
The master’s thesis deals with the theory of thin film technology, especially creating these layers. The work includes the distribution of vacuum deposition techniques for physical (PVD) and chemical (CVD). The main aim is to create a theme in different ways of implementation by using magnetron sputtering device, and these motives evaluated in terms of the quality of sputtering.
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Design of Avalanche Search
Ondráček, Michal ; Křenek, Ladislav (referee) ; Zvonek, Miroslav (advisor)
The Bachelors project is design of avalanche transceiver. Market situation study, the evolution of technology useful for this product. The design of a transceiver deals with the ergonomic aspects of using beacon in stressful situations and it finds a new ways in constructing of avalanche transceiver.
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Development of high-strength concrete defined properties with the use of secondary raw materials
Ondráček, Michal ; Vítek,, Jan (referee) ; Ďurica,, Tibor (referee) ; Vymazal, Tomáš (referee) ; Hela, Rudolf (advisor)
Civil engineering development is connected with the application of new construction methods and the development of new building materials. Concrete, as one of the basic building materials, is part of this development. A major turning point in the development of concrete and its properties occurred with the use of new, more efficient plasticizing additives. This allowed to produce concrete with lower water cement ratio, while increasing the strength of concrete. Gradually, the compressive strength of concrete boundary has moved by several levels, when there are currently commonly used concrete with strength of about 100 N/mm2 and with the special methods of concrete production strength range from 250 to 300 N/mm2. A negative aspect of the development of (ultra) high-strength concrete is their energy and economic demands. A characteristic feature of high-strength concrete is a high content of cement and very fine admixtures, especially silica fume. One way to improve the economics of these types of concrete is the application of cheaper admixture based on industrial waste. The content of this work is the observation and description of the properties of high-strength concrete and reactive powder concrete, in which the admixtures were based on industrial waste were applied. Part of this work is the comparison of economic parameters for individual types of concrete.
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Information System Assessment and Proposal for ICT Modification
Ondráček, Michal ; Novák, Lukáš (referee) ; Koch, Miloš (advisor)
The master thesis describes the analysis and proposal of changes of information system for the village Hrušovany u Brna. The analysis of information system was done mainly using the method HOS8. Changes were made on the base of the analysis, mainly the new part of the information system, which collects data about waste sorting in families. Introduction of these changes bring new information to the management and contribute to better waste management in the village.
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Hodnocení přesnosti měření vlhkosti dřeva smrku při použití elektrického odporového vlhkoměru
Ondráček, Michal
This bachelor thesis focuses on the evaluation of the accuracy of spruce wood moisture measurement using an electrical resistance hygrometer. In the theoretical part, the basic properties of wood and its influence on moisture measurement are described. Furthermore, the different methods of measuring wood moisture are described and, above all, the principle of measurement using an electrical resistance hygrometer is discussed in detail. In the practical part, the moisture content of spruce wood was measured with three electric resistance moisture meters and the results were then compared with a reference gravimetric measurement method. Moisture meter No. 1 showed the most accurate results in determining the moisture content, but even it did not come close to the actual moisture content determined by gravimetry. Moisture meters 2 and 3 obtained identical measurements, but the measured moisture content differed significantly from the actual moisture content of the wood determined gravimetrically. These two hygrometers showed worse results than hygrometer No 1.
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Use of organic fibers in fine-grained cement composites and their influence on the monitored properties
Mazán, Tomáš ; Ondráček, Michal (referee) ; Křížová, Klára (advisor)
The diploma thesis describes the possibilities of using organic fibres to improve the properties of cement composites at high temperatures. The theoretical part of the thesis deals with the behaviour of the different components of concrete and concretes in fire. A substantial part is devoted to the types of fibres, the method of dosage and the effect of their use on selected parameters. The practical part of the thesis is based on the developed methodology. On the basis of the results obtained, a summary of the behaviour and transformations of different types of organic fibres when exposed to temperatures from 20 to 800 °C was compiled. Furthermore, the observed parameters and the effect of the fibres, especially on the strength of the composite loaded at high temperature, are evaluated. The final of thesis concludes with recommendations for fibre dosage and the suitability of using recycled fibres.
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Breeding of salamanders in zoological gardens - analysis of trends and success
ONDRÁČEK, Michal
Amphibians are currently the most endangered group of verterbrates living on Earth, with populations in the wild declining rapidly due to pollution and loss of their habitat, trapping of individuals from nature, global climate change and spread of diseases. My work is focused on mapping the situation in tailed amphibians in zoos and aquariums all over the world. Using acces to the database of zoos ZIMS creates an overview of all breed species, institutions, which are engaged in their breeding and their results. An integral part of this work is a literary overview of the history of breeding amphibians in zoos, their protection and current ex situ projects.
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