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Eddy current sensors
Gregor, Lukáš ; Fidler, Petr (referee) ; Beneš, Petr (advisor)
This master’s thesis discourses the problematics of eddy current sensors of transformer type dedicated for measuring non-contact distances of unferomagnetic and feromagnetic objects. This thesis contains the design, realization and finding of the optimal values for the sensor usage. The sensor properties are measured and certified by empirical calculations and simulations in the Comsol Multiphysics programme.
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War, Arms and Armour in the Representative Strategies of Bohemian and Moravian Aristocracy, 1550 - 1750
Prchal, Vítězslav ; Vorel, Petr (advisor) ; Knoz, Tomáš (referee) ; Fidler, Petr (referee)
Vítězslav Prchal War, Arms, and Armour in the Representative Strategies of Bohemian and Moravian Aristocracy, 1550-1750 dissertation thesis, 2012 In Czech historical writing, history of aristocracy has been on a rise ever since the turbulent days of 1990s. It has always been characterized by application of various methods borrowed form different other fields, such as cultural or social history as well as historical anthropology, and its primary goal was to understand the mentality of the specific social class that is early modern aristocracy. Throughout time, several approaches emerged form the initial probing: first, study of political culture and power; second, study of aristocratic courts and residences; and, third, study of aristocratic family and its life-cycle. All this research was originally focused on 16th century aristocracy; however, it also successfully tackles topics of late 17th and 18th century in recent years as well. Study of aristocratic residences especially has quite a long tradition in Czech historiography, following the lines of socially interpreted art history. On the other hand, as military history is a rather neglected part of writing on the early modern era, this problem transpires into the connection of warfare and aristocracy in 16th to 18th century. For example, not...
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Piezoceramics Measurements
Fialka, Jiří ; Fidler, Petr (referee) ; Beneš, Petr (advisor)
The master’s thesis deals with the piezoelectric coefficients, the resonance frequency and especially the piezoelectric constants verification. With the assistance of several devices, for instance LCR-meter HIOKI 3532, impedance analyzer Agilent 4294A and LCR-meter Agilent E4980A, the resonance and the anti-resonance frequencies as well as impedance and capacitance of samples are measured. The paper opens with the theory of the piezoelectric phenomenon and the difference between direct and indirect piezoelectric phenomenon, it also describes the basic behaviour of a piezoelectric ceramic element during mechanical straining or applied voltage. Further, the paper concerns the description of various piezoelectric constants and their calculations. Subsequent part of the paper is devoted to the temperature dependence of the main piezoelectric parameters of PZT ceramics. The materials coefficients are delineated as a function of temperature of the piezoelectric charge coefficients dij, relative permittivity r, electromechanical coupling factor kij and frequency constants Ni. One of the chapters also determines the piezoelectric charge constant d33 of PZT ceramics by laser interferometer and compares it with the value measured by resonance methods. The surface displacement was measured by a single-beam interferometer Polytec OFV-5000. The results of measurements of piezoelectric charge coefficients d33 acquired by the first and the second method are identical. The last section of the paper is focused on different methods of experimental studies on the characteristics of heat transfer by diffusing heat through conduction between the silver-plated surface of cylinder made of PZT ceramics. The effect on the resonance and the anti-resonance frequencies is monitored. There after, the real heat, determined by thermo camera and the physical model of heat transfer created in program COMSOL Multiphysics, is analysed.
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Eddy current sensors
Gregor, Lukáš ; Fidler, Petr (referee) ; Beneš, Petr (advisor)
This master’s thesis discourses the problematics of eddy current sensors of transformer type dedicated for measuring non-contact distances of unferomagnetic and feromagnetic objects. This thesis contains the design, realization and finding of the optimal values for the sensor usage. The sensor properties are measured and certified by empirical calculations and simulations in the Comsol Multiphysics programme.
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PR articles as a part of unpaid linkbuilding
Kuděla, Ondřej ; Nemrava, Jan (advisor) ; Fidler, Petr (referee)
The aim of this bachelor thesis is to define PR (Public Relations) articles in light of Search Engine Optimization (SEO) and describe the possibilities of publishing PR articles on Internet servers in the Czech republic. In the preamble of the thesis, I introduce the theory of linkbuilding, which improves the position of the website in the search engine results for given key words. Thesis is focused on unpaid linkbuilding and even presents other possible types of activities, besides publishing PR articles. The next part of the thesis is focused on the value of PR articles mainly for SEO purpouses, but also for general marketing. In the last part of this thesis, the publication of PR articles on chosen PR servers is practicly demonstrated, and also some useful tools are mentioned.
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Internet marketing and new trends
Babec, Martin ; Štědroň, Bohumír (advisor) ; Fidler, Petr (referee)
Internet population in Czech republic and its segmentation. Development of advertisement spending into internet. Types of internet advertising in the Czech republic. New trends of internet marketing (social networks, geolocation services, mobile marketing). Proposal of low-cost marketing campaign on internet (using wide range of communication channels of internet marketing).
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Seminatural spawning of brook minnow
FIDLER, Petr
The main subject of this experiment was to explain the behaving of the minnow during its reproduction, the preferation of the spawning substratum, the length of the incubation of eggs, the evolution and the growth of the juvenile and the fry. Brood fish were taken by elektrical unit in the Blanice river, in the area between the railway bridge and the weir in the village of Blanice. These were put into the experimental pond of 75 square metres. There were two spawning processes. The first took place on 10 June , the fry hatched after ten days and in the next ten days it could be found all over the pond looking for food. In the selection of the substratum the gravel (of the size of 2-5cm) was prefered at all. The standard length of the fry at the end of the process of breeding (after a hundred days) was 39{--}48 mm (the amount of 800 individuals). The second spawn took place on 11 August. The fry hatched after eight days and the next week it was hidding in the substratum and consuming yolk sack. The standard length at the end of the breeding was 18{--}26mm. The ammount of the breeded fry was 350 individuals.
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