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Polymeric biocompatible materials
Matlák, Jiří ; Stránský, Lubomír (referee) ; Molliková, Eva (advisor)
The aim of the bachelor’s thesis is polymeric biocompatible materials. In the first part the problematic of the biocompatible materials is discussed and the basic terms are explained. In the next part are described polymeric materials and their chemical composition, mechanical and chemical properties and examples of applications.
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Assessment of the design of the new solution sliding contact in electrical machines
Záhejský, Petr ; Mach, Martin (referee) ; Veselka, František (advisor)
The thesis is devoted to assessing the concept of a new solution to the sliding contact in electrical machines. The work is focused mainly on the issue of collector engines, which are almost exclusively used in electric hand tools. Much of the work is devoted to angle grinders, which are usually used in extreme conditions and demands for seamless operation are enormous. In order partial insight into the problems in the introduction are studied phenomena acting on the sliding contact, wear and durability. Then further materials and diagnostic methods for increasing the transfer efficiency brush - commutator brush - ring. The following sections of this thesis is also considered a proposal innovated brush along with the practical verification and evaluation of the suitability of the use of innovative sliding contact.
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Improving the operating characteristics of sliding contact
Mišinger, Lukáš ; Hájek, Vítězslav (referee) ; Veselka, František (advisor)
This master's thesis is focused on comparison of various conception of slide contacts. Studies of this theme are based on laboratory models and consequential experiments and measurements to the application of innovated slide contacts. The innovation is based on application Teflon on the slide contact's components. In this project there are presented results from measurements with application of innovated brushes „sT“, brush holders with „sT“ and new conception of slide contact with auxiliary teflon brush on DC machine. Next part is about innovation of trolley-bus traction collector, which was used on trolley-bus and results of its laboratory experiments. The last part presents results of long term experiments with "sT" technology, which was applicated in a few variants of industrial usage.
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Optimization of production of thin films of metallic materials
Čejka, Marek ; Kadlec, Michal (referee) ; Šubarda, Jiří (advisor)
The present thesis deals with optimization of the formation of thin layers of metallic materials. In the theoretical part was elaborated overview of the implementation of the formation of thin- film structures, particularly using vacuum techniques. Chemical and physical vapor deposition. They were described methods of pretreatment of thin layers. The findings were discussed methods of controlling the pre-treated surface, quality control and mutual adhesion of coating layers. In the experimental part of the pre-treatment methods were selected and applied to selected substrates. Pretreatments were evaluated using a control surface by wetting angles and by atomic force microscopy. Then, the metal structure formed of copper on the pretreated substrates. Implementation by means of magnetron sputtering. Adhesion layers was checked by testing the surface lattice method. The quality was observed by scanning electron microscopy. The results were used to design the technological process of making metal layers.
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Deposition and diagnostics of plasmachemical prepared thin polymer layers based on 2-methyl-2-oxazoline
Podzemná, Daniela ; Slavíček, Pavel (referee) ; Mazánková, Věra (advisor)
The deposition of thin polymer layers, which are antibacterial and cytocompatible at the same time, is one of the solutions to prevent infection when using biomaterials in biomedical applications. The formation of layers based on plasma polymerization in the surface dielectric barrier discharge, which was used in the presented work, seems promising in terms of time and financial simplicity. When we use the plasma polymerization method, it should be possible to create a layer containing such functional groups that will have the ability to repel unwanted bacterial contamination. The analyte used in this work to form such layers is the monomer 2-methyl-2-oxazoline. Plasma polymerization of this substance produces polyoxazolines, which are known for their antibacterial and cytocompatible properties. Part of the work also deals with polytetrafluoroethylene, which in our case is substrate for deposition. The subject of the experimental work was the subsequent characterization of the layers using biological diagnostic methods, which were antibacterial tests and cytocompatibility tests in vitro. The physico-chemical properties of the layers were investigated using SEM, FT-IR and the surface free energy determination method. The experimental part also included the study of interactions of electrons and ions with molecules taking place in the plasma.
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Assessment of the design of the new solution sliding contact in electrical machines
Záhejský, Petr ; Mach, Martin (referee) ; Veselka, František (advisor)
The thesis is devoted to assessing the concept of a new solution to the sliding contact in electrical machines. The work is focused mainly on the issue of collector engines, which are almost exclusively used in electric hand tools. Much of the work is devoted to angle grinders, which are usually used in extreme conditions and demands for seamless operation are enormous. In order partial insight into the problems in the introduction are studied phenomena acting on the sliding contact, wear and durability. Then further materials and diagnostic methods for increasing the transfer efficiency brush - commutator brush - ring. The following sections of this thesis is also considered a proposal innovated brush along with the practical verification and evaluation of the suitability of the use of innovative sliding contact.
|
|
|
Optimization of production of thin films of metallic materials
Čejka, Marek ; Kadlec, Michal (referee) ; Šubarda, Jiří (advisor)
The present thesis deals with optimization of the formation of thin layers of metallic materials. In the theoretical part was elaborated overview of the implementation of the formation of thin- film structures, particularly using vacuum techniques. Chemical and physical vapor deposition. They were described methods of pretreatment of thin layers. The findings were discussed methods of controlling the pre-treated surface, quality control and mutual adhesion of coating layers. In the experimental part of the pre-treatment methods were selected and applied to selected substrates. Pretreatments were evaluated using a control surface by wetting angles and by atomic force microscopy. Then, the metal structure formed of copper on the pretreated substrates. Implementation by means of magnetron sputtering. Adhesion layers was checked by testing the surface lattice method. The quality was observed by scanning electron microscopy. The results were used to design the technological process of making metal layers.
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Improving the operating characteristics of sliding contact
Mišinger, Lukáš ; Hájek, Vítězslav (referee) ; Veselka, František (advisor)
This master's thesis is focused on comparison of various conception of slide contacts. Studies of this theme are based on laboratory models and consequential experiments and measurements to the application of innovated slide contacts. The innovation is based on application Teflon on the slide contact's components. In this project there are presented results from measurements with application of innovated brushes „sT“, brush holders with „sT“ and new conception of slide contact with auxiliary teflon brush on DC machine. Next part is about innovation of trolley-bus traction collector, which was used on trolley-bus and results of its laboratory experiments. The last part presents results of long term experiments with "sT" technology, which was applicated in a few variants of industrial usage.
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Polymeric biocompatible materials
Matlák, Jiří ; Stránský, Lubomír (referee) ; Molliková, Eva (advisor)
The aim of the bachelor’s thesis is polymeric biocompatible materials. In the first part the problematic of the biocompatible materials is discussed and the basic terms are explained. In the next part are described polymeric materials and their chemical composition, mechanical and chemical properties and examples of applications.
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Vliv magnetické susceptibility na T1 relaxace 129Xe.
Bartušek, Karel ; Rychnovský, Jan
Every substance has its own susceptibility, which can affect homogenous magnetic field in magnetic resonance measuring. Local homogenous magnetic field deformation reduces T1 and T2 relaxation times of measured materials. By the laboratory glasses magnetic susceptibilities measurement, we obtained theirs walls influence to thermally polarized 129Xe T1 relaxation times.
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