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Antialiasing frequency filter
Kocián, Daniel ; Murina, Milan (referee) ; Sedláček, Jiří (advisor)
The bachelor´s work deals with a project of the connecting of the antialiasing electronically turnable ARC filter of the low pass of the fifth order with the Butterworth approximation with the adjustable limited frequency FM in the extent 10 kHz – 100 kHz. The theoretical part includes a short summary and a description of constituent blocks of the complete device. Then the problems of the frequency filters are analyzed there. The practical part consists the project of the printed circuilts of all constituent blocks, then the calculation of all circuited components of ARC filter of the type of low pass for all limit frequencies of the filter. The result of the all work is a device which consists of five blocks and its core is the microcotroler ATmega16. For the electronic turnabling of the filter there are used digital potenciometers. The inseparable part is the enclosed CD-ROM which includes all made materials.
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Determination of nonylphenol and its isomers in waters
Sedláček, Jaroslav ; Mravcová, Ludmila (referee) ; Vávrová, Milada (advisor)
This diploma thesis is focused on the issue of nonylphenol, degradation product of surfactants. Nonylphenol however most often arises in wastewater treatment plants predominantly during the microbial degradation of nonylphenol ethoxylates used in industry. It is a substance highly bioaccumulative, toxic predominantly to aquatic organisms. Furthermore, it belongs among hormone disruptors. The detailed research was prepared, on the basis which experimental part of diploma thesis was solved. Nonylphenol was determined in samples of the wastewater. The solid phase extraction (SPE) was used for the isolation of the analyte and purification of the extract. The final determination was performed on the gas chromatography with tandem mass spectrometry with time of flight analyzer (TOF). All steps of the preanalytical and the analytical procedure were optimized.
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Analysis of Company´s Financial Position
Sedláček, Jan ; MBA, Vladimír Fuchs, (referee) ; Groligová, Ivana (advisor)
The subject of this paper entitled 'Posuzení finančního zdraví firmy' (Analysis of Company´s Financial Position) is the application of financial analysis on the assesment of a civil engineering company. The first part sets out the theoretical premises, the second part discusses the present situation and the last part contains a financial analysis of the company, which assesses the financial health of the company between 2004 and 2006 and suggests steps to improve the financial strategies of the company.
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SELV power sources
Friedl, Martin ; Murina, Milan (referee) ; Sedláček, Jiří (advisor)
The aim of this diploma paper is to examine the required characteristics of power sources SELV which are used for electric devices of category III. The first part of this diploma paper deals with general knowledge considering power sources. With the focus on switching power sources SELV, their overcurrent, thermal-overload and overvoltage protection and possible solutions of power sources SELV from the aspect of the required isolating safety. The second part of this work deals with the specific design of the power source SELV 230VAC/24VDC with the power output to 70W, with its implementation and with the measuring of its parameters.
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Assessment of contamination around the landfill Pozďátky
Sedláček, Jaroslav ; Zlámalová Gargošová, Helena (referee) ; Doležalová Weissmannová, Helena (advisor)
This bachelor thesis is focused on the characterization of the locality and on the evaluation of water contamination in a short distance from Pozďátky - the hazardous landfill. The occurrence of the selected contaminants is assessed. The samples were collected at five different locations: landfill leaks, the confluence of these leaks with the Prašinec creek, in other parts of the Prašinec creek affected by contaminated waters and on the very site of the creek Prašinec where no water pollution has been expected.
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Current-Input Current-Output Active Circuit Elements and their Applications
Vávra, Jiří ; Sedláček, Jiří (referee) ; Maschke, Jan (referee) ; Biolek, Dalibor (advisor)
The thesis deals with definitions of new current- or mixed-mode circuit elements and their implementations and applications. Based on the analysis of the state-of-the-art, novel application circuits employing the above circuit elements are designed. For the purpose of the experimental verification, the active elements are implemented via commercial integrated circuits, and their applications are simulated via PSpice. The application circuits are focused on frequency filters, rectifiers, oscillators, and current-copy circuits. Selected applications are analyzed with respect on real influences, and measurements on circuit prototypes are also performed.
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Security Conception of Brno Turany Airport
Loučka, Karel ; Sedláček, Jaromír (referee) ; Janík, Radomír (advisor)
In my thesis I address improvement of safety system of an international airport in Brno-Turany. I perform an analysis of current legislative safety needs and description of EU airport issues. I define particular safety requirements in reference to Brno-Turany airport. In the last part of my paper I suggest safety system that takes advantage of up to date technologies and recommendation to secure safety.
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Program for design of CATV
Sedláček, Jan ; Hála, Ondřej (referee) ; Říčný, Václav (advisor)
The main task of this master’s thesis is to create an interactive computer programme for the design of small and medium television cable circuits. The first part of this document describes main conceptions of a modification and a distribution of television signals. There are also introduced basic topologies of small and medium sized distribution networks, some passive and active elements in the circuit including their usage. There is also described an algorithm for calculation of circuit’s values. The second part contains a detailed description of created programme with all of its functions. A part of this document is made by a sample calculation of the four variants of circuit and its comparison with computer calculation. In suplement are included selected parts of source code.
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