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Compressible fluid motion in time dependent domains
Sýkora, Petr ; Feireisl, Eduard (advisor) ; Pokorný, Milan (referee)
In this work we study the existence of weak solutions for compressible Navier-Stokes equations in unbounded time dependent domains. Using the methods introduced in Feireisl E. Dynamics of Viscous Compressible Fluids we extend the results of article Feireisl E. Neustupa J. Stebel J., Convergence of a Brinkman-type penalization for compressible fluid flows, which studies the flow with a "no-slip" boundary condition on bounded domains. Next, we extend results of article Feireisl E. Kreml O. Nečasová Š. Neustupa J. Stebel J., Weak solutions to the barotropic Navier- Stokes system with slip boundary conditions in time dependent domains, which studies flow with compete Navier boundary condition. Finally, we discuss solutions for rotating fluid system. In this case, there are new members in momentum equation, representing the Coriolis and centrifugal force, which cause problems.
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The life and works of J.S. Machar between 1914-1942
Sýkora, Petr ; Wiendl, Jan (referee) ; Holý, Jiří (advisor)
Tato práce, vznikající postupně v průběhu posledních pěti let, byla iniciována snahou přispět co největší možnou měrou k osvětlení a zmapování života a díla českého básníka a fejetonisty Josefa Svatopluka Machara. Na toto téma bylo pochopitelně napsáno několik více či méně povedených monografických knih již v minulosti. Jmenujme například studie V. Martínka Josef Svatopluk Machar (1912), Z. Pešata Josef Svatopluk Machar básník (1959), F. Soldana Josef Svatopluk Machar (1974) nebo stať B. Svozila uveřejněnou v jeho macharovském výboru Pravdy znak (1982). Vzhledem k tomu však, že všechny zmíněné monografie zachycují takřka výhradně básníkovo předválečné období a vyhýbají se jeho životu ve 20. a 30. letech 20. století, stejně tak jako opomíjejí jeho tvorbu z této doby (nebo vše shrnují na pouhých několika stránkách), bude úkolem této práce podat co nejucelenější a nejpodrobnější pramenný materiál k poznání Macharovy poválečné tvorby a zároveň jeho života v dotčených letech, neboť právě v souvislosti s tímto obdobím je básníkův obraz nejčastěji pokřivován tradovanými omyly, nepravdami a zjednodušujícími frázovitými formulkami, a to jak v ústním podání, tak mnohdy i na stránkách učebnic literatury.
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The life and works of J.S. Machar between 1914-1942
Sýkora, Petr ; Holý, Jiří (advisor) ; Wiendl, Jan (referee)
Tato práce, vznikající postupně v průběhu posledních pěti let, byla iniciována snahou přispět co největší možnou měrou k osvětlení a zmapování života a díla českého básníka a fejetonisty Josefa Svatopluka Machara. Na toto téma bylo pochopitelně napsáno několik více či méně povedených monografických knih již v minulosti. Jmenujme například studie V. Martínka Josef Svatopluk Machar (1912), Z. Pešata Josef Svatopluk Machar básník (1959), F. Soldana Josef Svatopluk Machar (1974) nebo stať B. Svozila uveřejněnou v jeho macharovském výboru Pravdy znak (1982). Vzhledem k tomu však, že všechny zmíněné monografie zachycují takřka výhradně básníkovo předválečné období a vyhýbají se jeho životu ve 20. a 30. letech 20. století, stejně tak jako opomíjejí jeho tvorbu z této doby (nebo vše shrnují na pouhých několika stránkách), bude úkolem této práce podat co nejucelenější a nejpodrobnější pramenný materiál k poznání Macharovy poválečné tvorby a zároveň jeho života v dotčených letech, neboť právě v souvislosti s tímto obdobím je básníkův obraz nejčastěji pokřivován tradovanými omyly, nepravdami a zjednodušujícími frázovitými formulkami, a to jak v ústním podání, tak mnohdy i na stránkách učebnic literatury.
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Evaluation of roe deer losses during meadow harvests in Semily
Sýkora, Petr ; Kušta, Tomáš (advisor) ; Benediktová, Kateřina (referee)
SÝKORA, Petr. Evaluation of the issue of young roe deer mortality during haymaking in Semilsko: Czech University of Life Sciences Prague, Faculty of Forestry and Wood Sciences.
The aim of the work Evaluation of the issue of young roe deer mortality during haymaking in Semilsko was the research of technical text on selected issues as well as the analysis of the hunting of Vošmenda Valley Hunting Association. On the basis of this analysis, three sites of the similar size were chosen. Subsequently, various frightening devices were placed there and the mortality of young roe deer during haymaking was studied. The next aim was the evaluation of the ratio of the loss of roe deer to measures used.
The frightening devices used in order to achieve these goals were: the scent fence along with a mechanical frightening device (polystyrene boards hanging on a stick), passing through the area with a hunting dog and the site without any protective measure.
The result of the work was a comparison of these sites with the mortality of young roe deer when using different protective measures. The site where a hunting dog was used turned out to be the one with no mortality. On the contrary, the site where the combination of different measures was used, turned out to be the worst one.
Individual sites were influenced by various factors that affected the course of haymaking, for example the weather and time of cutting. The communication between farmers and hunters itself is also of great importance.
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Information System for Property Management
Sýkora, Petr ; Lukáš, Roman (referee) ; Techet, Jiří (advisor)
The purpose of this bachelor thesis was to analyze application of information systems in property management and then design and implement such system. Special attention was given to users roles, their permissions and security. The part of implemented system was also multilanguage user interface and export to PDF format.
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Data Mining in Data Stream
Sýkora, Petr ; Chmelař, Petr (referee) ; Zendulka, Jaroslav (advisor)
This thesis deals with the data mining in data stream which represents fast developing area of information technology. The text describes common principles of data mining, explains what data stream is and shows methods for its preprocessing and algorithms for following data mining. The special attention is given to the VFDT and the CVDT algorithm. The next mentioned are the spatiotemporal data and related data mining. The second part describes the design and implementation of the application for classification over spatiotemporal data stream represented by road traffic data and following prediction of spatiotemporal events (traffic-jams). The classification is performed by the VFDT and CVFDT algorithm. The application has been tested on the data set obtained by the simulation tool SUMO.
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Modern marketing communication
Sýkora, Petr ; Zeman, Jiří (advisor) ; Filipová, Alena (referee)
Modern marketing communication is in recent years often discussed topic not only because of the internet. This thesis examines in detail the current trends in internet marketing, especially banner and mobile advertising. The aim of this thesis is to decribe a shift of the media cost from traditional media like print or radio advert to online advertising, as well as outline the expected developments in mobile advertising and application of theoretical knowledge in practice. The theoretical part deals with the very concept of marketing, marketing communications but also describes the problems of marketing research and the development of the Internet in the world and in the Czech Republic. The practical part then describes in detail the various processes that involves banner advertising and comments the current trends in mobile advertising.
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Analysis of the market discount sites
Sýkora, Petr ; Zeman, Jiří (advisor) ; Filipová, Alena (referee)
Discount servers in the Czech Republic enjoys great interest from the very beginning of its operation in 2010. This thesis analyzes the discount sites and aims to show the various activities that involves the operation of discount porta but also that the portals discount model is sustainable. The first chapter describes the various parties that participate in collective purchasing and marketing mix. The second chapter is devoted to the history and development of the discount sites. The third section presents the selected server and its business strategy, the fourth chapter is devoted to marketing activities. The last fifth chapter describes the future perspectives and developments in the coming years.
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PROPOSITION OF THE DIFFERENTIAL FEEDBACK CONTROL OF ROTOR’S POSITION FOR CONTACTLESS SUPPORT
Kozánek, Jan ; Synek, L. ; Sýkora, Petr
This paper proposes a differential method for the position control of electromagnetic actuator. The differential method is frequently used by active magnetic bearing in industrial application too. The controller is consisted of position regulator and two current regulators with auxiliary differential part, where is counted a difference between biases current and position current. Thus the controller contains a current feedback and a position feedback. The current feedback is used as current control into exciting coil and the air-gap is measured by an eddy current position sensor. The position stabilization of the contactless rotor is provided by suitable analogue regulator.
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