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Monitoring of temperature influence on properties of lead-acid accumulators
Musil, Petr ; Křivík, Petr (referee) ; Bača, Petr (advisor)
This thesis deals with lead-acid battery, its parameters and temperature behaviour of this electro-chemical source of power. In the theory section, types of batteries are presented, followed by their primary parameters and electro-chemical reactions, which take part in battery cells. This section also contains information about charging stages, detailed description of each battery part, used materials, construction of the battery and degradation processes caused by battery operation. The practictal section of this thesis offers a measurement scheme for automated measuring workstation. Furthermore, the practical section presents results of measurements on parameters of chosen lead-acid battery types, it also contains long-term deep battery cycling and measurements under elevated temperatures. Detailed comparison of measurements results and datasheet values is included. Conclusion sums up parameters of chosen lead-acid battery types and their feasibility for further usage in power backuping.
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Design of optimal utilization of company's data capacities
Odehnal, Tomáš ; Hrbáček, Miroslav (referee) ; Ondrák, Viktor (advisor)
The diploma thesis deals with the problem of storage capacities of server discs in the allowance organization of Brno City Museum. The organization has long-lasting troubles with insufficient capacity of these discs. The aim of this thesis is to analyse the current state and to propose a suitable solution on the basis of the results of this analysis. Further, the suggested measures should be applied as well.
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Safety Assesment of the Těšany Dam during Floods
Desatová, Martina ; Holomek, Petr (referee) ; Jandora, Jan (advisor)
The aim of this bachelor thesis is safety assessment of the Těšany dam in the conversion of control floods. The content of the work is a description and summary of basic data on the water structure the documents and the resulting values, including descriptions of hydraulic calculations. The requirements ČSN 75 2935 were a basis for this thesis. The result of thesis is evaluation of current condition of dam and associated facility.
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Editing roundabout Hviezdoslavova x Bedrichovicka
Klusková, Jana ; Pančík, Vladimír (referee) ; Smělý, Martin (advisor)
The aim of this Bachelor's thesis is solution of the problem of the roundabout that connects road II/430 Hviezdoslavova and the road III/715283 Bedřichovická in city district Brno Slatina. It is about single lane roundabout. The crossroad is situated on the edge of the city and the main problem is satisfactory capacity of it. This problem is linked to the movement of the vehicles leaving the city in the afternoon hours and arriving the city in the morning hours and also with transit transport across the roundabout. The aim is to design new geometry of the roundabout to increase its capacity and also increase the fluidity and efficiency of the passage of vehicles through the intersection with emphasis on the safety of vehicles and pedestrians . The work also includes solutions for pedestrians through the intersection and the draft modifications sidewalks, barrier adaptations of pedestrian crosswalks , points for crossing and adjust the bus stops.
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Exploring the influence of pressure on the life of lead acid batteries for hybrid electric vehicles
Pospíchal, Martin ; Tošer, Pavel (referee) ; Bača, Petr (advisor)
The lead-acid batteries used in hybrid electronic vehicles HEV operate in high-rate mode in a state of partial charge PSoC. It occurs when the degradation mechanisms related to irreversible sulphation and negative electrodes are a limiting factor in the life of lead-acid batteries. The electrode system was applied to experimental pressure cells of different sizes. Exp. cells were subjected to measurement and evaluation of potential negative electrode, a negative active mass resistance, contact resistance of transition collector - the active mass with the evaluation and measurement of pressure fluctuations within four PSoC runs.
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River regulation and designing flood protection
Úlehla, Jiří ; Špano, Miroslav (referee) ; Duchan, David (advisor)
This thesis focuses on assessing the capacity of the river channel Becvy in the urban area of Prerov and design of flood protection for the city. Flood protection was designed in two variants. In the first variant dealt with recess bottom of the river. The second variant included a proposal of flood protection wall combined with a mobile barriers. The results are summarized in the synoptic maps.
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Digital Image Steganography
Mazánek, Antonín ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
This bachelor's thesis introduces the steganography scientific discipline. It presents its ancient and relative recent history, mentions its current use and outlines the possible directions for steganography future. It introduces steganography into context of hiding information superior domain and highlights differences between other methods in this domain. It describes steganography subdivisions and closer deals with digital image steganography. It presents some known methods and types of digital image data. The thesis also contains more detailed description of image data in PNG format. It describes the implementation of LSB and PVD steganography methods with images in PNG format as cover object and evaluates their key properties, namely: imperceptibility, capacity and robustness. At the end of the thesis, the author's reflection on the results and possibilities of further modifications of the mentioned methods is given.
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Comparison of different types of commercial lithium-ion batteries
Šindelářová, Anna ; Kazda, Tomáš (referee) ; Libich, Jiří (advisor)
The master's thesis is devoted to the comparison of different types of lithium-ion batteries. Primarily, an introduction to electrochemical power sources and their division is described. Furthermore, the thesis deals only with lithium-ion batteries. In the theoretical part, the chapters discuss the history, the principle of operation and a detailed description of the main battery parts, including used materials. A comparison of commercially available lithium-ion cells with each other as well as with other types of batteries is also included in the theoretical part. The practical part deals with the cyclinf of lithium-ion cells and subsequent evaluation of the effect of temperature on the capacitance and current characteristics of these lithium-ion batteries.
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CDMA Network Capacity
Pasečný, Jan ; Kejík, Petr (referee) ; Hanus, Stanislav (advisor)
The Bachelor thesis deals with determining which factors influence the capacity of CDMA network. This type of network is now being used worldwide due to its huge increase in capacity when compared to other transmissions systems. The work contains summary of basic parameters of single-cell and multi-cell systems with reference to the capacity. Obtained results are assesed and compared at the end of the work.
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