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The Cross in Changing of Times and its Significance in Ancient Society
Roule, Radek ; Lášek, Jan Blahoslav (advisor) ; Weis, Martin (referee) ; Royt, Jan (referee)
The Cross in Changing of Times and its Significance in Ancient Society The cross is the most widespread symbol appearing worldwide right from the prehistoric times. Though being formed of a very simple shape of two intersecting lines the significance is far reaching. This dissertation looks at the cross both as a sign pointing beyond itself and concentrates on the diversity of its visual appearance. It tries to trace back the possible factors preceding Antiquity influencing the formation of the actual shape in that particular period of history. Although for most part the cross is understood in its connection with the Crucifixion of Christ its history is far more complex beginning in pre-Christian era. The biblical texts present more or less mere allusions of the cross itself. Seen typologically the cross may be understood as the element connecting both Old and New Testament creating a sort of a bridge between them. The careful analysis of the Early Christian documents brings several terms used for the same reality. The most significant are - σταυρός with the Latin equivalent crux and ξύλου (wood) with the Latin equivalent lignum. Later on these give a way to a more general term of σημεῖον (sign) and finally to a symbolic expression "σύμβολον σωτηρίας" (sign-symbol of salvation). The early Christian writers...
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Study of magnetic structures in the solar corona
ŠEBELÍK, Václav
The thesis presents a comparison of data obtained from the solar radio spectrograph RT5 in Ondřejov and data from the space probe SDO. In the theoretical part of the thesis the solar corona and the current state of knowledge are briefly described. The practical part is devoted to the processing of obtained data using developed programs. From all of structures found in the spectrograms, zebra structures have been selected for more detailed study.
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Rooftop photovoltaic system and its return of investment
Burián, Michal ; Radil, Lukáš (referee) ; Pěcha, Jiří (advisor)
The Bachelor’s Thesis is focused on a potency of using the Rooftop photovoltaic system, like the investment project. The general principle of the photovoltaic transformation and eventual utility of a sun solar radiation in Czech Republic is described in the first part of the Thesis. Furthermore there is a overview of approachable technology of the photovoltaic systems. The third part contains a review of inverters and photovoltaic systems integration. Following the complete concept of the Rooftop system and the calculation of capital expenditure for the selected property. Finally, the last part of the Thesis attend to summarize produced aggregate energy, the profit assignment due to service system. The main aim is to evaluate the Rooftop photovoltaic system and its return on the investment due to operating costs.
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Design of Solar Hot Water Systems for Residential House
Kvapil, Jakub ; Morávek, Jan (referee) ; Radil, Lukáš (advisor)
This bachelor´s thesis deals with the design of a solar system for water heating in apartment building. The introduction covers solar collectors. The following part contains theoretical calculations according to the TNI 73 0302 standard. The thesis includes the design of solar system and its financial balance. The technological scheme is included in the appendix.
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Photovoltaic panels of new generation
Loveček, Michal ; Radil, Lukáš (referee) ; Mastný, Petr (advisor)
The Bachelor thesis deals with the possibilities how to take use of photovoltaic power stations situated in the Czech Republic. In the first part there is the procedure of photovoltaic energy convertion analyzed and the source of this energy described – Sun. The pieces of information about the technology of sollar cells manufacturig and some new technologies recently developed by scientist are summed up in the following part. As next there is the function of photovolatic arrays described as well as how the form of their construction affect their effectiveness. And last but not least the individual project of FV system for family house in Czech Republic with its evaluation is worked out.
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Photocell as a power source for a small DC motor of RC car model
Nábělek, Ondřej ; Huzlík, Rostislav (referee) ; Mikulčík, Aleš (advisor)
The goal of this project is to acquaint the reader with problems of solar cells and project of systems for solar cells power a small electric machine performance. Preliminary discussion of the energy produced by the Sun incident on the Earth. Another chapter contains information about the fundamental function of solar silicon cells and conversion of solar energy to electric energy. Main part of this work is devoted to various types of solar cells, production materials, the structure of cells and solar panel. The last part is a measurement system for solar cells, the verification of theoretical assumptions and evaluate the results of the work.
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Using of Renewable Energy Sources for Family House Supply
Varmuža, Jan ; Macháček, Jan (referee) ; Toman, Petr (advisor)
This work is concerned to analysis and evaluation of present recoverable energy resources and position EU to them. In study is provided comparison of recoverable resources (biomass, water, wind, environment energy, and sun). The details are noted for all single cases. As the next addition are included various techniques „how to obtain and convert them“. In study are also noted which necessary equipments must be used and their proper location. In practical part is done comparison of barrier-layer photocell from polycrystalline and monocrystalline silicon and water insulating foil „EVALON SOLAR“. For comparison was taken only produced energy. Next step was financial analysis of each single system and comparison with pay-off in case that invested sum (actual price) was placed to bank under time deposit and share capital fund. During analysis of financial evaluation was found, that more suitable is system from polycrystalline silicon. Because of investors main condition is financial aspect, so for realization will be recommended system from polycrystalline silicon.
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V-I characteristic of solar cells
Kaderka, Tomasz ; Křivík, Petr (referee) ; Vaněk, Jiří (advisor)
The theoretical part is to outline the possibilities of solar energy conversion, learn about the issues solar cells and describe the history of photovoltaics and photovoltaic energy conversion. Then describe principle of the measurement VA characteristics of photovoltaic cells. This issue is not as easy as it seems at first sight, because the solar cell isn’t a linear component, which is very easy to measure. Analysis of VA characteristic of photovoltaic cells affects parameters such as: light intensity, temperature, serial and parallel resistance, the slope of the light source, and more. The practical part deals with creating a workplace for automatic measurement of VA characteristics of photovoltaic cells in the LabVIEW. Challenge is to create a functional program, which automatically measures the VA characteristics not only in the lighted cells, but also in the shaded cell (diode mode). The program calculates the power and important parameters, such as short-circuit current, open circuit voltage, maximum power, current and voltage at maximum power article. The program allows you to export the measured values to a text file. In the last chapter of this work is made control measurements of three samples of monocrystal photovoltaic cell by the measuring workplace. The measurement is compared with the reference device Solar Cell Tester.
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