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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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Liquid electrolytes for lithium-ion accumulators
Štichová, Zuzana ; Vondrák, Jiří (referee) ; Sedlaříková, Marie (advisor)
The aim of this master´s thesis was the measurement of electrical conductivity and dynamic viscosity of the electrolytes. Based on these measurements to verify Walden theorem between measured variables. Electrolytes were used on sulfolane base in combination with propylene carbonate and salt. The thesis also deals with the measuring method of dielectric properties of electrical and optical method with a refractometer. The freezing point of combination of sulfolan and propylene carbonate were determined by cryoscopy.
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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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Study of the adheisve affinity into the wood cell wall at the sub-microstructural level
Mitrenga, Ondřej ; Rovnaník, Pavel (referee) ; Vaněrek, Jan (advisor)
This thesis focuses on the problematic of adhesive affinity into wood cell wall at the sub-microstructural level. The main subject of this thesis is research work of scholarly articles focused on the penetration of resins and polymers into the cell wall of the wood. In contains a description of the principles on which the used methods are based, and a summary of the results achieved. In the experiment, several method were used to investigate the possible penetration of selected methods adhesives into the structure of the cell wall. These are fluorescence microscopy, confocal microscopy, scannin electron microscopy (SEM) and transmission electron microscopy (TEM).
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Viscometer adjustment for materials of higher viscosity
Laryš, Šimon ; Jankovský, Jaroslav (referee) ; Otáhal, Alexandr (advisor)
The aim of this bachelor‘s thesis is to rebuild and verify the functionality of an old SHEEN CP1 viscometer for measuring soldering and thick-film pastes according to the design from the semester project. The theoretical part presents the basic viscosity calculations for newtonian and non-newtonian substances. The basic methods of viscosity measurement for different types of substances are also explained here. The greatest emphasis is placed on devices that can measure thixotropic substances. The practical part presents a design for a method which reduces the speed of the viscometer and a design for the interconnection of individual components from the semester project and its assembly. Following part contains description of the modules and sensors used and the program part with libraries where functions for individual peripherals were created and explained. The connection of individual components is also explained here. Finally, the functionality of the modified viscometer is verified by measuring the soldering and thick-film paste.
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Heat transfer fluids for solar thermal systems
Hylský, Josef ; Frk, Martin (referee) ; Šimonová, Lucie (advisor)
This master thesis deals with the basic problems of solar thermal systems, which are using heat transfer medium. At the beginning this thesis describes basic components of the solar system, especially their meaning and attributes. Further in the thesis are mentioned heat transfer liquids for commercial usage which are used in those systems, their basic properties and dependence on temperature. There is described the physical nature of liquid viscosity and also ways how to measure them. The same is for measurement of liquid density and thermal conductivity. At the end was made measurement of dynamic viscosity of heat transfer liquids for commercial usage at different temperatures. In practical part of the thesis were mixed samples of alternative heat transfer mediums. It was measured their thermal and physical attributes, like for example density, dynamic viscosity and coefficient of volumetric expansion. Each measurement was compared and evaluated.
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Cold asphalt mixtures
Spáčil, Petr ; Hýzl, Petr (referee) ; Dašek, Ondřej (advisor)
The bachelor thesis is divided into theoretical and practical part. The theoretical part consists of explanation of the problem. The thesis includes definitions as Bitumen, Asphalt Mixture, Asphalt Binder, Cut-back Bitumen and Viscosity. The practical part is focused mainly on the description of the test methods used on Asphalt Binders and Mixtures which were intended for repairs. It describes differences between used Asphalt Binders and explains and describes other used materials. The practical part compares the mixtures of different Cut-back Bitumen. It describes the production process and project of Cut-back bitumen mixture, the production process of individual test solids and compares the differences with hot made asphalt mixture. It also describes the analysis of volumetric, mechanical-physical and funcional tests in purpose of evaluating the differences between standard Cut-back Bitumen and new biofluxed asphalt binder.
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An overview of oils and their engineering applications
Kozák, Ondřej ; Frýza, Josef (referee) ; Šperka, Petr (advisor)
This Bachelor´s thesis deals with an overview of current state of knowledge of lubricating oils and their engineering applications. It includes characteristic and division of oils by manufacturing method and division of these oils by chemical structure. Basic compounds of oils including most used types of additives are mentioned and described. Next part of the thesis focuses on lubricant properties. Final part includes resume of applications in which the listed oils are applied and required properties for each type of application are mentioned.
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interaction of adhesive with structural wood
Janová, Petra ; Rovnaník, Pavel (referee) ; Vaněrek, Jan (advisor)
This labor is based on penetration of adhesives into a wood cell walls. It focuses mainly on adhesives that are currently used for construction purposes. It also contains a methodics of selecting adhesives and wood, which will be used for glued joints and summarizes the methods used for detect these adhesives in the wood cell wall. It experimentally verifies the appropriate selection of the dye-solvent combination used in the adhesive.
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Diagnostics of the perspective insulating liquids
Spohner, Milan ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
This work deals with the classification and diagnosis of electrical insulating liquids. Furthermore, the theoretical part describes the mathematical and physical principles of these liquids. The automated workplace was compiled with development environment VEE Pro for measurement of viskosity and control thermostat medingen and modifiable components for measuring complex permittivity in the frequency range. In the experimental part was carried out measurements of selected material parameters, investigated the effect of difficult conditions and made the mathematical evaluation of physical phenomena.
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