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Oils for combustion engines
Dzurenda, Ján ; Novotný, Pavel (referee) ; Maršálek, Ondřej (advisor)
Bachelor's thesis deals with information search of the current state of knowledge in the field of lubrication of combustion motors, i.e. lubrication systems and oils for combustion motors. The introduction of work focuses on the issue of lubrication systems, theirs partitions by methods of lubrication and description of the main parts of the lubrication system. Next part is focused on the oils of motors. In this part is referred to division of motor oils, requirements for motor oils and characteristics of motor oils. Follow part describes issues associated with the lubrication of combustion motors. Part cites main factors that affect the properties of motor oils i.e. fuel, water, glycol and dirt. Further is processed problem of motor working i.e. temperature, amount and consumption of oil. The last part describes the issues of biodegradability and actual requirements of application for motor oils.
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Durability test of magnetorheological fluid at high temperature
Grygárek, David ; Strecker, Zbyněk (referee) ; Roupec, Jakub (advisor)
This bachelor’s thesis is focused on behaviour of magnetorheological fluid during the durability test. In the first part are described basic properties of MR fluid and is defi-ned parameter LDE (Lifetime Dissipated Energy), which is used for prediction of durability of MR fluid. Primary part of thesis devote to realization of experiment, which measures a part of durability test at 70°C and monitoring the yield stress, vis-cosity and residual magnetism.
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Investment casting waxes and measurements of their properties with regard to simulation software
Bochníček, Štěpán ; Mikulka, Vít (referee) ; Kosour, Vojtěch (advisor)
Today, the use of simulations is increasing in order to reduce cost and complexity of production and also to prevent product defects. For this purpose, we use simulation programs, such as ProCAST. This program is designed for simulation of casting parts. In my bachelor thesis I focused on the methods of casting lost wax, where the model is made of wax mixture. In each simulation we have to obtain and specify the properties of the material to casting. I described these properties and methods of measurement in this bachelor thesis.
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Characteristics of gels used in the fluids engineering
Hudák, Igor ; Habán, Vladimír (referee) ; Fialová, Simona (advisor)
Not only in common life, but also in the technical area the usage of gels presents some kind of standard. Gels offer a unique possibility of usage in numerous areas. The gel structure itself is a very interesting material however it’s hard to specify its characteristics. The gel system presents a huge macromolecular network which enables to observe its different characteristics in comparison to other materials. In some circumstances gels act almost as conventional materials, in other circumstances, however, they act significantly otherwise. Therefore this bachelor thesis deals with a description and summarization of single characteristics of gels in chosen branches of the mechanical engineering industry where gels are used on a daily basis, such as sealant of pipeline systems, wires or electronic components. The thesis also describes principles of gel formation, with the emphasis to building of gel substance and with respect to its mechanical and physical features. In the end, the thesis gives a comparison of chosen characteristics of gels that are used as sealants and gels that are used for encapsulation of electrical set.
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Effect of lubricant rheology on lubrication film thickness.
Prášilová, Alena ; Šperka, Petr (referee) ; Křupka, Ivan (advisor)
Lubrication is a very important part of mechanical engineering, which ensures high lifetime of machine parts, reduction of friction and wear and also it leads to decreasing of power consumption. In this bachelor`s thesis there is described rheology of newtonian and non-newtonian lubricants and its effect on lubrication film thickness. Measured central film thickness values are compared with theoretical prediction.
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Lubrication of combustion engines in 21st century
Súkeník, Juraj ; Nevrlý, Josef (referee) ; Křupka, Ivan (advisor)
Lubrication is inseparable part of internal combustion engines. It primary influences operation, lifetime and efficiency of internal combustion engine. This bachelor`s thesis summarizes present state and future view of internal combustion engine lubrication. The work deals with tribology of several engines sections and composition of present lubricants for internal combustion engines.
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Lubricants in Up-to-date Combustion Engines
Čech, Martin ; Svída, David (referee) ; Dundálek, Radim (advisor)
In my bachelor work I have tried to analyze informations about lubricants in up to date combustion engines. This work deals with motor oils and their viscosity and performance classification The special motor oils for motorcycles are part of this bachelor work too. One of the aims of bachelor work provide informations about gear oils for automatic as well as manual transmissions and their classification. This work describes also questions about additives.
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Flow properties of hyaluronan colloids
Gabrielová, Michaela ; Ptáček, Petr (referee) ; Pekař, Miloslav (advisor)
The purpose of this study is to zoom in implication of flow properties of hyaluronan colloids with respect to physiological role. In the first part I will introduce physical formulation and definition of flow properties and reology, process to its measurement and utilization. In the second part you can read about hyaluronic acid and colloids of its salts. In this part I will focus on first studies of hyaluronic acid throught its occurence to its chemical properties. Within this work I will try to demonstrate interconnection of both subjects.
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Development and assessment of selected properties of emulsion cosmetics
Kuchyňová, Jitka ; Souralová Popelková, Miriam (referee) ; Zemanová, Jana (advisor)
This bachelor´s thesis focuses on assessment of selected properties of emulsion cosmetic product called Soothing face mask, which is produced by SynCare company. Thesis is targeted on rheological properties of the product. Basic rheological properties were measured by Brookfield viscosimeter in experimental part of the thesis. Short part of the text is dedicated to thermic analysis field, which may provide some useful pieces of information for storage of products in cryogenic temperature and development of emulsion products with good cryogenic-temperature resistance. Chemical properties of Soothing face mask product are expressed by description of particular characteristics of cosmetic ingredients in the product.
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Cement composite materials with polypropylene fibers
Preisner, Martin ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
This thesis deals with summarizing the possible effects of the addition of polypropylene fibers, especially low temperature plasma treated on the properties of cement composites and concrete. They are given basic information and distribution of polypropylene fibers. It describes the finish polypropylene fiber low-temperature plasma. The experimental part focuses on the effect of dispersion of polypropylene fibers treated plasma in the cement matrix.
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