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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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Stereo Based 3D Face Reconstruction
Falešník, Milan ; Svoboda, Pavel (referee) ; Šolony, Marek (advisor)
Tato práce se zabývá vytvořením programu pro rekonstrukc trojrozměrného modelu lidské tváře za pomocí dvojice kamer. Pro řešení využívá výpočtu hloubkové mapy a následný převod do trojrozměrného prostoru. Využívá Viola-Jones detektor pro detekci tváře. Využívá knihovny OpenCV a také částečně PCL.
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Model of the metropolitan optical network
Prudík, Jiří ; Hudcová, Lucie (referee) ; Křivák, Petr (advisor)
The purpose of this master’s thesis is foremost to provide a simple guide how to build elements of optical metropolitan area network. The basic model consists to sequence of construction, network topology, passive and active parts. The collection contains examples of alternative technology such as Wireless LAN with different frequency. The optical network construction based on optical cable, fibres, splices, trays, adapters, connectors and active parts for example a lot of media convertor models. After that there are demonstrating type of wavelength division multiplexer used in metropolitan area network – passive planar PCL splitter. One of the passive planar splitter are used to increase optical fibre channel. At the end of the collection a simplified examples of used measurements – optical time domain reflectometry and optical fibre transmission. Contains standard protocols or reflectogram. The conclusion of this thesis summarizes costs of FTTb (Fibre To The Building) model of optical metropolitan area network in Czech republic and future contribution for society.
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Doors and Door Handle Localization for PR2
Bambušek, Daniel ; Materna, Zdeněk (referee) ; Kapinus, Michal (advisor)
The aim of this thesis is to design and create module for robotic platform PR2, that is able to autonomously locate doors and door handle and provide information about their location and characteristics to another program that ensures their opening. The thesis describes the methods used for detection, design and implementation of this module and finally analyzes performed experiments with this module. The functionality of the method was verified by testing in simulator.
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Smart biomaterials for connective tissues regeneration
Hefka Blahnová, Veronika ; Filová, Eva (advisor) ; Maxová, Hana (referee) ; Motlík, Jan (referee)
Connective tissues are characterized by significant volume of extracellular matrix. Their main role is to provide a mechanical support and protection to other body organs. This thesis is focused on regeneration of bone, cartilage and osteochondral defect. In the experimental part we observed viability and differentiation of human mesenchymal stem cells. In vitro we evaluated the potential of PCL scaffold with addition of growth factors, bone xenograft with biomimetic peptides, collagen I composite with bioceramics and a titanium alloy with nanostructured surface. During following in vivo study, we implanted a cell-free scaffold made of PCL, calcium phosphate and IGF-1, bFGF, TGFβ1 and BMP-2 to osteochondral defect. Unfortunately, addition of growth factors resulted in pathological inflammatory process despite clear beneficial effect in vitro. Likewise, the biomimetic peptide sequences promoted osteogenic differentiation of human mesenchymal stem cells. Addition of certain bioceramics influenced the scaffold morphology in the manner of pore size. However, we did not observe any effect of the surface characteristics on cell behavior. The cells were influenced rather by certain material. On the other hand, surface modification of titanium scaffold by anodic oxidation revealed that the most suitable...
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Interactions in solutions and gels of stimuli-responsive polymer systems investigated by NMR spectroscopy
Konefał, Rafał ; Spěváček, Jiří (advisor) ; Hrabal, Richard (referee) ; Štěpánek, Miroslav (referee)
Stimuli-responsive (stimuli-sensitive, intelligent, or smart) polymers are polymer materials which, after small external stimuli, evidently change their physical or chemical properties. Smart polymers can be classified according stimuli they respond to such as: temperature changes, mechanical stress, light irradiation, ultrasonic treatment, application of external magnetic as well as electric field, changes of pH, ionic strength, addition of the chemical agents and presence of biomolecules and bioactive molecules. Stimuli-responsive synthetic polymer systems has attracted considerable attention due to wide range of applications, i.e. controlled drug delivery and release systems, diagnostics, tissue engineering and 'smart' optical systems, as well as biosensors, microelectromechanical systems, coatings, and textiles. Among the types of stimuli for this dissertation temperature, pH and reactive oxygen species (ROS) responsive polymer systems were studied. In case of thermoresponsive polymers, when polymer chains are molecularly dissolved in a good solvent, changes (increasing or decreasing) of temperature result in insolubility (globular nanoparticles formation) of polymer chains, called temperature induced phase-separation. pH responsive polymers change properties such as: solubility, volume (gels),...
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Object Detection in the Laser Scans Using Convolutional Neural Networks
Marko, Peter ; Beran, Vítězslav (referee) ; Veľas, Martin (advisor)
This thesis is aimed at detection of lines of horizontal road markings from a point cloud, which was obtained using mobile laser mapping. The system works interactively in cooperation with user, which marks the beginning of the traffic line. The program gradually detects the remaining parts of the traffic line and creates its vector representation. Initially, a point cloud is projected into a horizontal plane, crating a 2D image that is segmented by a U-Net convolutional neural network. Segmentation marks one traffic line. Segmentation is converted to a polyline, which can be used in a geo-information system. During testing, the U-Net achieved a segmentation accuracy of 98.8\%, a specificity of 99.5\% and a sensitivity of 72.9\%. The estimated polyline reached an average deviation of 1.8cm.
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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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Automated System for Components Scanning
Hřib, Jan ; Boštík, Ondřej (referee) ; Jirgl, Miroslav (advisor)
The aim of this thesis is to design an automated scanning system for components for the purpose of inspecting their dimensions and tolerances. The theoretical introduction provides the reader with basic information on the topic of 3D scanning. The work also includes the design of own scanning system. The greatest attention is paid to the design of a program using the PCL library. The aim of the program is automatic processing of data from a 3D scanner and evaluation of the required dimensions of the scanned component. The final part of the work is devoted to testing the proposed solution.
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