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Mechanical properties of gel polymer electrolytes
Bárta, Vladimír ; Vondrák, Jiří (referee) ; Sedlaříková, Marie (advisor)
This work deals with the measurement of electrical conductivity and mechanical properties of gel polymer electrolyte containing Lithium ion. Their preparation and performance depends on the concentration of nanoparticles Al2O3 contained therein. The theoretical part deals with the development of gel polymer electrolyte, their use and methods of measurement of electrical conductivity and mechanical properties. In the experimental part describes the preparation of gel electrolyte, the measurement of electrical conductivity, temperature dependence and the measurement of mechanical properties.
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Laboratory workplace for measurement of DVB-T2 MISO broadcasting
Bárta, Vojtěch ; Kratochvíl, Tomáš (referee) ; Polák, Ladislav (advisor)
This bachelor thesis deals with measurement and analysis of DVB-T2 MISO broadcasts. The theoretical part of the thesis describes the broadcasting chain of the DVB-T2 system at the level of the physical layers. Attention is paid to both SISO and MISO transmit modes. In the experimental part of the work is to design a measuring workplace for monitoring and analysis of DVB-T2 MISO transmission in laboratory conditions. The functionality of the proposed concept and chosen measuring methodology was verified by a set of experimental measurements.
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Slab bridge over the Lužnice River
Bárta, Vojtěch ; Zich, Miloš (referee) ; Panáček, Josef (advisor)
The goal of this bachelor´s thesis is to design a slab bridge over the Lužnice river. The bridge consists of a one span. Implementation was designed in three studies, of which is developed in detail the study of prestressed monolithic slab. To create a static model and to calculate the internal forces is used Scia Engineer 2012. The assessment is processed manually according to European standards. Losses of preload are estimated, the effect of shrinkage and creep is neglected.
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Performance analysis of SFNs transmitters of DVB-T2
Bárta, Vojtěch ; Miloš, Jiří (referee) ; Polák, Ladislav (advisor)
The diploma thesis deals with the design and analysis of Single Frequency Networks (SFNs) transmitters for Digital Video Broadcasting – second generation of the Terrestrial (DVB-T2). In this thesis, the software of the Czech company CRC data is used. Main attention is focused on the SFN Networks computational system for the analysis and design od DVB-T2 SFN networks, in which a series of simulations of the transmitting Multiplex 21 (CH26) have been performed. The simulation-based results are used to identify locations with lower signal coverage or interfering sources as well as to find appropriate approaches to solve these issues. The rightness of the performed simulations is verified by field measurements in cooperation with the Czech Telecommunications Office (CTU), and finally a discussion on how to improve the performance of SFN networks follows.
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Mechanical propertties gel polymer aprotic electrolytes
Bárta, Vladimír ; Musil, Michal (referee) ; Sedlaříková, Marie (advisor)
This work deals with the measurement of electrical conductivity and mechanical properties of gel polymer electrolyte containing Lithium ion and their preparation. The theoretical part deals with the development of gel polymer electrolyte, their use and methods of measurement of electrical conductivity and mechanical properties. In the experimental part describes the preparation of gel electrolyte, the measurement of electrical conductivity, temperature dependence and the measurement of mechanical properties.
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Analýza udržitelného rozvoje vybraných států Afriky, se speciálním zřetelem na využití půdy a návrhy rámcových opatření
Bárta, Vojtěch
Abstract Title: Analysis of sustainable development in selected African countries, with special reference to land use and proposals for framework measures. This work consisted of selecting 3 developing countries in Africa according to selected criteria and then analysing pre-determined areas of these selected countries. Subsequently, proposals and measures leading to the promotion of sustainable development of the analyzed countries were built on the analysis. The results of the work were based on the proposals and measures that were established for the individual states, and for the analyzed states in aggregate, concluding the work with a summary of the results in order to prepare them for possible use by anyone, in the further development of this issue. The selected states represented three very diverse territories, including a state whose territory extends into the Sahara Desert. The draft frameworks, which were designed to promote their sustainable development, focused on combating the degradation of the torpid soil type following deforestation, providing water for agriculture and other purposes, combating desertification, agricultural policy and combating corruption. These draft measures were designed to be as feasible as possible, taking into account the lack of resources available to developing countries and other limitations of these territories.
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Planning of Single Frequency Networks for DVB-T2
Barta, V. ; Polak, L. ; Cidl, P.
Nowadays, especially in Europe, the second generation of Digital Video Broadcasting Terrestrial system, abbreviated as DVB-T2, gradually replaces its predecessor DVB-T. Compared to DVB-T, DVB-T2 is a more versatile system with several configuration settings. Thanks to this, the planning of Single Frequency Networks (SFNs) used to effectively cover a certain area by DVB-T2 signal can be more flexible and straightforward. This paper deals with the design of SFNs for DVB-T2, especially with focus on the study of DVB-T2 system parameters (e.g. guard interval) and transmission conditions (e.g. multipath propagation) directly affecting performance of SFNs. For this purpose, RadioLab, RadioBase and Networks SFN utilities from CRC data software are used. Real DVB-T2 system configuration for Multiplex 21 (MUX 21) used in Brno (Czech Republic) is employed in this study. The simulation-based results can help to identify places with lower signal coverage or interfering sources as well as to find appropriate approaches to solve these issues.
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