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Determination of climatic factor on the degradation of various solar cells types
Peroutka, Tomáš ; Jandová, Kristýna (referee) ; Vaněk, Jiří (advisor)
In this work are discussed photovoltaic cells. There are also discussed basic concepts of radiation source for solar cells. Also mentioned the issue of semiconductors and even the history and evolution of the solar cells. A large part deals with possibilities of photovoltaic cells degradation. In one chapter is an attempt to bring some types of photovoltaic cells and a description of the production of these modules.The practical part deals with photovoltaic modules degradation and its evaluation. Following part compares measured values with the values provided by producer of photovoltaic modules.
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Degradation of Photovoltaic Modules
Poledník, Tomáš ; Křivík, Petr (referee) ; Vaněk, Jiří (advisor)
The bachelor diploma thesis is focused on the constructional technology of the solar modules as well as on the problems of the induced degradation under the influence of the potential. It specifies the key issues and possible elements that influence the effect of environment with regard to possible causes of the origin of degeneration. The thesis includes the description of measuring of the polycrystalline and monocrystalline technologies that are resistant to the leading potential. Furthemore, the measuring was carried out on the chosen testing pieces that had been affected by the degradation of the output
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Measuring RLC on the components of electrical circuits
Pokorný, Marek ; Vítek, Ondřej (referee) ; Veselka, František (advisor)
Aim those work is inform numerator about possibilities and features gauging apparatus 7600 Precision LCR undergrounds and further then about metering paramers R,L,C on components electric standing ,especially then on sliding contacts,with which this work acquaint and how are their characteristics important for correct functionality electrical machine whereof are site rated power.Warp work largely start from manual to apparatus 7600 Precision LCR undergrounds and further then out publication sliding contact in electrical machine - doc. Veselka, doc. Chmelik.
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Comparison of parameters of selected types of commercial lithium-ion batteries
Špina, Martin ; Libich, Jiří (referee) ; Bača, Petr (advisor)
This thesis deals with operation principles of Lithium-ion battery. It evaluates its characteristics, advantages, and disadvantages. Technological processes and materials used in manufacturing and recycling are also discussed. Practical part of the thesis evaluates initial capacity of given Li-ion cells at different loads. Batteries are then cyclically charged and discharged, and its capacity and other parameters are determined. Electrochemical impedance spectroscopy data are also taken and evaluated for batteries in new-like condition, used batteries and cycled batteries as the capacity fades.
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Long-term tests for examination of surface treatments in various adverse environments simulating real effects
Hudečková, Petra ; Vacula, Miroslav (referee) ; Bydžovský, Jiří (advisor)
Cement bonded particleboards contain organic base and as they are set outside, extreme weather condition, such as frost, chemical defrosting substances or sulphates, cause their degradation. The presence of the organic base in the matrix of the material could be the reason why there is higher probability of degrading when compared with materials containing an inorganic base. It could be partially eliminated by an appropriate surface modification of the slab, which main goal is to weaken the impact of an aggressive environment and to extend the lifespan of the board. On the other hand, the surface modifications based on a polymer base are prone to degrade because of other unfavourable conditions such as UV radiation when compared with the cement bonded particleboard. The classification of the surface modifications and the way of their degradation caused by the aggressive environment in real applications are presented in the theoretical part of the thesis. In the experimental part, appropriate methodical ways of testing the resistance of cement bonded particleboard’s coating system were chosen. Then, the testing and comparing of the physical, mechanical and aesthetic properties of different types of coatings were done. Moreover, a spectrophotometric analysis of the colour shade changes for the different aggressive environment were carried out. Furthermore, microstructures of chosen surface modifications were assessed by using an optical and an electron microscope.
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Study of glyphosate degradation in water plasma application
Vašinková, Alena ; Vávrová, Milada (referee) ; Mravcová, Ludmila (advisor)
This work deals with the current problem of increasing concentrations of glyphosate in groundwater and wastewater due to insufficient efficiency of methods used in wastewater treatment. From this point of view effective removing of glyphosate from water have to be developed by new methods and technological processes. The methods used so far in wastewater treatment plants should be replaced or supplemented by advanced oxidation processes. The practical part of this work is devoted to glyphosate and its degradation in water by plasma. Samples were taken sequentially during plasma application and further evaluated by LC/MS selected as suitable analytical methods. The aim of this work was to determine the efficiency of plasma in water with admixture of glyphosate.
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Comparison of different types of commercial lithium-ion batteries and their properties under low temperature
Bičák, Tomáš ; Máca, Josef (referee) ; Libich, Jiří (advisor)
The diploma thesis deals with the issue of lithium-ion batteries. Describes development, technologies and materials used. The diploma thesis describes the operating principle, characteristics, advantages and disadvantages. The work is focused on the characteristic properties of commercial lithium-ion batteries under standard conditions and at reduced temperatures. At reduced temperatures, changes in properties due to low temperatures are observed. Furthermore, in this work they compare the measured values with the values given by the manufacturers.
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Dry Ice Blasting and Industrial Practice
Konečná, Eva ; Máša, Vítězslav (referee) ; Kuba, Pavel (advisor)
This thesis deals with the subject of dry ice blasting and its industrial practice. The key charakteristics of dry ice are described as well as an overview of dry ice blasting practical usage in various industries. Main part of this thesis focuses on a study of dry ice degradation, through a series of experiments and observations.
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Materials for Production of Chords for Musical Instruments
Krhut, Štěpán ; Němec, Karel (referee) ; Molliková, Eva (advisor)
My bachelor’s work is about materials used for making the musical strings and its protection against its wear off. The introduction deals with evolution and history of the musical strings and the next chapters explain physical basics of the vibrations and how to make the musical string. There are also highlighted and many times mentioned guitar strings in my work due to the string manufacturers are made to develop and implement various high level demands into the strings because of the many various guitar playing techniques.
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