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Behaviour of ferroelectrics in an electric field
Krejčí, Josef ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
The submitted thesis describes characteristics and use of ferroelectric materials which find their utilization in electrotechnical and electronics industry. The thesis is mainly aimed at their behaviour in the electrical field at various intensity and also focuses on their diagnostic methods. The method using an oscilloscope is selected as the most suitable and described here in more detail. Measuring laboratory workplace for detection of characteristics of ferroelectric materials in the electrical field has been innovated with available equipment and then its utility has been verified. Temperature and electric tension dependence of components of complex permittivity and electric condition of the material has been scaled using selected samples of ferroelectrics. A text in an electronic form has been integral part of the thesis. The text can be used as an instruction manual for laboratory trainings.
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Properties of the perspective ferroelectric materials
Krejčí, Josef ; Frk, Martin (referee) ; Rozsívalová, Zdenka (advisor)
This thesis studies the properties and the applications of prospective ferroelectric materials which are used in electrical engineering and electronic industry. Further are physically explained and mathematically described the basic principles running in their structure. The practical part is aimed to build a workplace for measuring the components of the complex permittivity in the frequency and temperature area, controlled by the programmed measurement and service application using the Agilent VEE Pro 8.0 and MS Excel. The functionality of the workplace was verified on the selected material samples by measurement and evaluation of selected properties. For this issue was created electronic text, which can be used as a guide for laboratory exercises and it is an integral part of this work.
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Study of ferroelectric materials
Kos, Lukáš ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
This work is focused on the study of perovskite ferroelectric materials group and monitoring changes their dielectric parameters in temperature and frequency dependence Is described scrystallographic systems of barium titanate and their influence on material properties. The measured values are mathematically interpreted using the Curie – Weiss law and discussed about the influence of strontium titanite on important dielectric parameters.
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Ferroelectrics in an electric field
Pavelka, Petr ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
The submitted thesis describes characteristics and use of ferroelectric materials which find their utilization in electrotechnical and electronics industry. The thesis is mainly aimed at their behaviour in the electrical field at various intensity. The method using an osciloscope is selected for measuring. For the main measuring in part of this thesis was produced experimental wafer with five samples which were subsequently mesuared. The VEE PRO program was used for creating of collecting datas for histeresis loop and it’s functionality was checked on wafer with five examples in measuring. During this measuring was also measured electric tension dependence of components of complex permittivity.
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Marketing campaign for José Cury
HUSÁROVÁ, Iva
My thesis is aimed at marketing campaign concerning the concert of José Cura organized within 19th International Musical Festival Český Krumlov and also at cultural marketing. The thesis is separated in practical and theoretical part. The theoretical part is specialized in cultural marketing and proceeds from findings of expert literature and information gathered from internet resources. The practical part deals with making of marketing campaign for concert of José Cura getting the data from the real campaing which was made for 19th International Musical Festival Český Krumlov.
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Discovery of Natural Radioactivity and New Development of the Town of Joachimsthal , Bohemia in the first half of the 20th Century
Těšínská, Emilie
Early research into natural radioactivity, closely connected with the uranium minerals, stimulated new development of the old mining town of Joachimsthal in Bohemia in the first half of the 20th century. Radioactive waste material from the uranium dye production in Joachimsthal served as material for the first radium preparations processed by Pierre and Marie Curie. The high concentration of radon in watter of Joachimsthal mines was measured by Austrian physicists Heinrich Mache and Stephan Meyer in 1904. In 1906, the first private radon spa was organized in Joachimsthal by medical doctor Leopold Gottlieb.
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Porovnání fyzikálních a chemických vlastností slitin Fe80Nb3Cu1B16 a Fe33,5Ni40Nb3Cu1Si13,5B9
Zábranský, Karel
Two FINEMET-type alloys FeNbCuB (F) and FeNiNbCuSiB (FNS) in the as-quenched amorphous, relaxed amorphous and nanocrystalline states have been investigated using Mössbauer spectroscopy, X-ray diffraction, magnetic and electrochemical methods. Present work summarizes the results obtained in the as-quenched and relaxed amorphous states. A partial substitution of Si for B and mainly of Ni for Fe (FNS-alloy) had a pronounced influence on the majority of the physical and chemical properties. A significant decrease in Curie temperature, an increase in crystallization temperature, a decrease in saturation magnetic polarization supported also by a decrease of hyperfine induction were observed.
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