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Effect of additives in lead-acid batteries for hybrid electric vehicles
Tobolák, Jakub ; Křivík, Petr (referee) ; Bača, Petr (advisor)
This thesis is focused on lead-acid batteries used in hybrid electric vehicles. These batteries operate under partial charge, which brings problems with premature capacity loss. Tasks is to examine the influence of glass fibers as possible additives to the negative electrode of these cells in order to extend their life. The text describes the problem of hybrid electric vehicles, lead-acid batteries and other electrochemical sources.
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Lubrication of gasoline and diesel engines
Krejčí, Tomáš ; Vaverka, Michal (referee) ; Křupka, Ivan (advisor)
The main subject of this bachelor’s thesis is describing the present state of knowledge in the sphere of compression-ignition and spark-ignition engines lubrication, lubricants and future trends. First part is about internal combustion principle, engine construction. Next parts are about engine lubrication system, lubricating modes, and its locating in the engine. Last part is about oils, and insights into the future.
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Modified glass fibers as additives of the negative electrode of a lead-acid battery
Zbožínek, Tadeáš ; Zimáková, Jana (referee) ; Bača, Petr (advisor)
This bachelor thesis is focused on the working of lead-acid batteries in hybrid electronic vehicles. The goal is to increase the negative electrode characteristics of VRLA batteries. The negative electrode suffers significant degradation in the partial-state-of-charge mode, which is used for these vehicles. When the VRLA battery is being used in the partial-state-of-charge mode, premature loss of capacity occurs due to sulfation of the negative active mass. For these reasons we are trying to improve active mass with additives, which Is expected to interrupt the unwanted processes, that leading to capacity loss. We are focusing on a specific additive in form of glass fibers, which exhibits similar positive effect on the lifetime of the battery as a carbon additive. The surface of glass fibers will be modified. Afterwards, the influence of the modified glass fibers on the lifetime of the battery will be observed.
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Reducing the operating temperature of the production and laying of asphalt mixtures
Komenda, Radek ; Valentin,, Jan (referee) ; Hýzl, Petr (advisor)
The subject of this thesis is the issue of reduction of the operating temperatures in the production and laying asphalt mixtures with a more specific focus on influencing the functional properties of these mixtures, especially low-temperature parameters. The thesis is notionally divided into two parts. The first part refers to the low-temperature asphalt mixtures and the second part pays the attention to asphalt mixtures with an added R-material. For production of asphalt mixtures in the first part of thesis were used five additives and for the second part were used a total of four different asphalt mixtures which differs in the participation of added R-material. Both parts are divided into a theoretical part, which discusses the existing experience, the use of these mixtures and the practical part, which analyses in detail the tested mixture ( the composition and preparation of tested specimens ) and deals with the result of laboratory test. In particular, it is a test of asphalt mixture resistance against the formation of frost cracks according to ČSN EN 12697-46 and by comparing the individual mixtures in comparison with the reference sample and among each other.
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Properties of electrode materials for alcaline accumulators
Fusek, Petr ; Vrbický, Jiří (referee) ; Sedlaříková, Marie (advisor)
The Bachelor´s Thesis is aimed at the problematic of the binders, that effects the features of the positive electrode of alcalic accumulators. The additive used on nickel´s electrode was cobalt. In the practical part of this thesis there is described a process for etching the nickel electrode and the following electrodepositions applied on these electrodes. Measurements of different concentrations of nickel and cobalt were examined and analysed in the graphs which are part of this thesis. There have been made comments of these graphs and the conclusions and observations as well.
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Sledování výskytu patogenních mikroorganismů v potravinovém odpadu po přídavku různých aditiv
Tomková, Lenka
Food waste and food waste management is a global problem. It is necessary to reduce waste and, when food waste is generated, to choose environmentally friendly solutions for its disposal, such as composting. The composting process is a natural decomposition process whose final product is valuable compost that can be used as fertiliser. In this work, the effect of additives on the suppression of pathogenic microorganisms potentially present in food waste is investigated to make the food entering the composting process safe for health. Classical culture methods (selective media for bacterial strains Salmonella spp., Escherichia coli, Helicobacter pylori and enterococci) were used for microbiological analyses and MALDI-TOF mass spectrometry and Sanger sequencing were performed for accurate identification of the grown colonies. The results showed that waste without the addition of additive contained more pathogenic microorganisms than waste with the addition of additive. Serratia spp. and the genus Pseudomonas were the most common in the samples. Tea tree oil appears to be the best additive, as it effectively suppressed the odour and also the waste with its addition did not contain significant pathogens such as Pseudomonas fluorescens compared to the control sample without its addition.
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Tribotechnická diagnostika prvonáplní motorového oleje z motorů osobních automobilů
Prokeš, David
The master thesis Tribotechnical diagnostics of first-fill engine oil from passenger car engines deals with the composition, production, distribution, wear and tear, specification of passenger car engine oils and their diagnostics and evaluation during use and wear. The research part of the thesis deals with the classification of lubricants and their brief description, classification of engine oils and a brief description of their manufacture. Subsequently, the basic concepts related to the above topic are described. The experimental part of the thesis deals with the methodology, material and actual measurement of selected parameters for the assessment of engine oil condition during engine break-in of new passenger cars. The selected indicators are the amount and morphology of particles, determination of the water content of engine oil, alkaline reserve, oxidation and additive content. The following diagnosis of the condition of the primary engine oil confirmed the assumption of a higher content of wear metals. An interesting result was the detection of higher oxidation rates in engine oils, which may be a consequence of long storage periods before the car is sold.
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Feed additives in pig nutrition
KOZINOVÁ, Eliška
Nutrition is one of the most important aspects of pig farming. Each category of pigs is fed by a special compound feed for a given group of animals. New alternatives to these drugs are still being explored due to the 2006 ban on growth-promoting antibiotics. Probiotics, prebiotics and phytobiotics, which have a positive effect on the digestive system of all categories of pigs, are becoming very popular substitutes.
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Základní aspekty výživy telat
MICHÁLKOVÁ SUDOVÁ, Klára
The thesis contains a literature review of basic aspects of the nutrition of calves. This is the nutrition of the calf from the prenatal period to the nutrition of calves in each category of development separately. These are colostrum nutrition, the period of milk nutrition and plant nutrition. The work also deals with the technology of feeding and specifically active substances in the nutrition of calves (additives).
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