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Inhomogeneous cosmology and averaging methods
Kašpar, Petr ; Svítek, Otakar (advisor) ; Balek, Vladimír (referee) ; Carloni, Sante (referee)
In this work we have examined different methods of averaging in general relativity and cosmology. We developed the method based on Cartan scalars. We computed the backreaction term for a flat LTB model with a special ansatz for the radial function. We found out that it behaves as a positive cosmological constant. In the next part of this thesis we were interested in averaging inside LRS class II dust model. For this family we averaged all the Einstein equations and the resulting system generalizes the Buchert equations. We numerically worked out two concrete examples where deceleration parameter changes its sign from positive to negative. Powered by TCPDF (www.tcpdf.org)
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Pricing in the Airline Industry
Kašpar, Petr ; Vacek, Pavel (advisor) ; Klinger, Tomáš (referee)
The main goal of this thesis is to introduce the low-cost airline model and the concept of predatory pricing together with their basic elements. For good understanding of the topic, the thesis introduces basic requirements that have to be satisfied in order for the pricing to be classified as predatory and means of testing for their presence. The theoretical background is further analysed in the review of six antitrust policies dealing with predatory pricing. Last, two predatory cases from the airline industry are reviewed in order to show the approach that is given allegations of predatory pricing in practice. JEL Classificiation K21, L41, L93 Keywords antitrust, predatory pricing, low-cost airlines Author's email mail@petrkaspar.net Supervisor's email vacek@fsv.cuni.cz
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Macroscopic gravity
Kašpar, Petr ; Žofka, Martin (referee) ; Svítek, Otakar (advisor)
Due to the nonlinearity of the Einstein equations it is possible to obtain modified equations of the general relativity (with application in cosmology) just by averaging. One of the first covariant approaches to this problem is the theory of Macroscopic Gravity. Next proposed possibility is to first characterize spacetime by the Cartan scalars and then to proceed averaging procedure.
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Communication Adaptor for Data Acquisition System Hardware and Software Design
Kašpar, Petr ; Frýza, Tomáš (referee) ; Jakubová, Ivana (advisor)
The aim of this bachelor thesis is to create adaptor with microcontroller for data acgusition system. Function of the device is to receive serial asynchronous string of ASCII characters which was send from ultrasonic thickness gauge. Baud rate of transmittion is 2400Bd. Transmittion is realized according to RS-232 standard. Part of the string contains numeric information about value which was measured by thickness gauge. This numeric information is in microcontroller multiplied with corrective constant and decimal point in result is placed to right position. Corrective constant is stored in EEPROM memory. After that adaptor transsmits data to superior system in format of serial asynchronous string of ASCII with baud rate 9600Bd. Thesis describes service code for microcontroller in Assembler language and hardware construction of device.
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Design of 3D Vivaldi antenna array for radar applications
Kašpar, Petr ; Pitra,, Kamil (referee) ; Puskely, Jan (advisor)
This master thesis deals with a design of Vivaldi antenna due to its broadband properties suitable for radar applications. The folding of single Vivaldi antenna element into 2D antenna array we achieved required radiation properties. Appropriate design of feeding structure realized by SIW technology we obtained suppression of side lobes and deflection of the main lobe. The work also includes design of 3D Vivaldi antenna array. Modeling, simulation and optimization of antenna array were performed in CST Microwave Studio.
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The use of technical analysis in currency markets
Kašpar, Petr ; Taušer, Josef (advisor) ; Žamberský, Pavel (referee)
This thesis focuses on description of methods of technical analysis, characteristics of foreign exchange markets and it also mentions the efficient market theory. The aim is to use the knowledge of technical analysis to select one simple trading strategy and through its optimalization to discover a functional and efficient trading system. In order to enable followers to continue in optimalization, it is also described the optimalization process in detail with probable obstacles. There are also mentioned other different and possible ways for further testing of this strategy.
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Analysis of selected factors on the use of public transport
Kašpar, Petr ; Vejchodská, Eliška (advisor) ; Louda, Jiří (referee)
This thesis is aiming on the use of public transport in Europe. Objective of this work is by using correlation analysis determine whether the amount of subsidies to public transport and the ownership structure as the decisive criterion for the number of passengers, as an additional variable to assess the impact of fleet composition. Secondary data obtained from study of the University of Dublin has served to analyze. Calculation of the dependence didn't confirm or disclaim it. This gives space for further exploration. After analyzing the more comprehensive data set should be followed by analyzing the nature of subsidies, the choice of carriers, contractual conditions and other factors affecting the use of public transport.
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