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The LiOh influence in alkaline accumulators
Prchal, Jiří ; Čech, Ondřej (referee) ; Pléha, David (advisor)
The deal of this thesis is study of the influence of LiOH added to electrolyte on Ni-Cd batteries. In theoretical part are analyzed properties of Ni-Cd accumulators in strong alkaline surroundings, especially with emphasis on structure changing of NiOH2 and NiOOH. In the second part of theoretical are also described methods for depositing Ni layers. In practical part electro-chemical spectrum and mass changing on Quartz crystal microbalance are measured by cyclic voltammetry method during charge/discharge process. The process of cation integration to the positive electrode structure in KOH, NaOH and CsOH electrolyte including related structural changes are observed.
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Thermal phenomena in lead acid batteries
Kovařík, Lukáš ; Čech, Ondřej (referee) ; Neoral, Jiří (advisor)
This thesis project solve problematic of thermal proces in lead-acid batteries. There are decribed history of lead – acid batteries, distributions of batteries, overview of construction lead – acid batteries and VRLA batteries and is decribed thermal runaway proces and basic termal process. They are listed here practical results and the measurements is concluded.
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Composite electrode materials for lithium-ion batteries based on LiFePO4 prepared using GAC method
Vilhelm, Ondřej ; Neoral, Jiří (referee) ; Čech, Ondřej (advisor)
Presented work investigates the problem of secondary lithium-ion cells and the different available cathode materials. We have prepared samples of LiFePO4 with the addition of different kinds of carbon materials such as Super P, Vulcan and expanded graphite. We have always created the sample with and without surfactant. Developed samples were compared by measuring electrochemical methods (cyclic voltammetry, charge and discharge cycles and impedance spectroscopy). We also modeled the three-point cell for measuring electrochemical electrode materials.
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Electrodes for lithium-ions batteries based on LiCoO2
Nejedlý, Libor ; Čech, Ondřej (referee) ; Sedlaříková, Marie (advisor)
This master´s thesis deals with electrodes for lithium-ions batteries based on LiCoO2. The first part of the project is devoted to the characteristics of Li-ion batteries, electrochemical reactions and characteristics of electrode materials. The next part describes an experiment that deals with the effects of NA doping on performance of layered materials for lithium secondary batteries. The materials were measured by cyclic voltammetry, impedance spectroscopy and galvanostatic cycling.
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The influence of alcaline accumulators loading on their parameters
Čech, Ondřej ; Vrbický, Jiří (referee) ; Sedlaříková, Marie (advisor)
This master's thesis deals with alkaline battery characteristics and it has special consideration of nickel-cadmium cells. There are three main experimental parts in this paper. First one is concerned with positive electrode materials properties and is aimed to investigate impact of magnesium ions formed into nickel hydroxide electrode structure. Second part deals with battery charging/discharging and response measurement tool design. National Instruments hardware PXI modules for data acquisition was used and program in LabView environment was made. Last one is concerned with nickel-cadmium cell properties changes during increased temperature stressing. Investigation of cell self-charge changes during lithium hydroxide addition into electrolyte was made.
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Airport Departure Hall
Čech, Ondřej ; Šmak, Milan (referee) ; Barnat, Jan (advisor)
The bachelor thesis deals with the design and assessment of steel load bearing structure of the departures hall of the airport. It is a purlin system consisting of sloping trusses of curved shape with overhangs that make up the awning above the entrance to the building. Truss to span 18 meters is welded from pipes. The steel used in the project is S355. For the design was used Scia Engineer software, in which was created a spatial model of the structure.
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Analysis of the APR for consumer credits
Čech, Ondřej ; Radová, Jarmila (advisor) ; Rajl, Jiří (referee)
The thesis is focused on analysis of consumption credits, which are provided by banking and non-banking providers. The work contains theoretical and legislative resources mainly for the pointer annual percentage rate, because the APRC should be the main compartive standard for consumers. The thesis contains comparison of consumer credits of several providers from the czech credit market. The overall evaluation of situation on market and recommendations for consumers are also included.
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Draft of a Software Solution for Performance Management
Čech, Ondřej ; Zelená, Veronika (advisor) ; Váchová, Lucie (referee)
This thesis discusses the topic of Corporate performance management and focuses on Balanced Scorecard method. In the theoretical part are described theoretic backgrounds of this method and fields related to the method. The practical part is based on the theoretical part and it is a result of cooperation with the consulting company Ambica. Balanced Scorecard method is thanks to its universality very popular tool of Corporate performance management which is usable in almost all types of organizations. Due to universality there is no single procedure how to implement BSC within an organization and also no supporting software exists. The aim of this thesis is to create a design procedure BSC and compile a list of functional properties of new Ambica's BSC software.
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E-business
Čech, Ondřej ; Voráček, Jan (advisor) ; Charvát, Michal (referee)
The aim of this bachelor thesis is to present options businessmen and managers whose companies entering the Internet. Describes possibilities, forms of business and marketing tools that can help the company being successful with customers. The theisis used a model Shifting from bricks to clicks. The model simulates the transition of having store in the form of business online.
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