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Ion beam analysis in material science
Macková, Anna ; Bočan, Jiří ; Malinský, Petr
In this paper we presented our results of complementary research using ion beam analysis for study of materials. Combination of RBS, PIXE and ERDA method enables us to characterize the elemental composition and the elemental depth profiles of complex multi-layer systems or study complicated difussion processes in different applications of material sciences. We described the newly installed methods TOF-ERDA and RBS-channeling and their application on material characterization and the results of testing of these methods at our workplace.
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The overview and the evaluation of the technical specifications of transparent materials for the production of composite wood panels
Holub, Jan ; Böhm, Martin (advisor) ; Arnetová, Karolína (referee)
Work includes: general introduction to the components of the wood-based panels with a transparent layer, the history of their production. It includes requirements for individual components of composite wood panels and requirements for wood and other wood-based materials, which serve as reinforcement. Also mentions claims potting material, which serves as a matrix.
It includes a description of the technology of wood-based panels with a transparent layer. This paper introduces the most commonly used material serving as a matrix, their distinctive characteristics essential for the production of composite plates. Compares parameters resins based on polyester, polyurethane and epoxy resins and analyzes the choice of a suitable material for producing a composite board based on user requirements. Part of this work is to design materials for the manufacture of composite board with controlled light distribution.
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Barriers preventing the leachate mobility from MSW landfills
Hošek, Michal ; Ettler, Vojtěch (advisor) ; Šebek, Ondřej (referee)
This bachelor thesis summarizes the current knowledge on precautions releted to the leachate migration outside the municipal solid waste (MSW) landfill. It is mainly focused on the characteristics of the engineered barriers, consisting of functional layers and providing better protection of the environment in the vicinity of the landfill with respekt to leached pollutants. These barriers, supported by natural geological barrier in the ground, are typically forming a sandwich construction. Materials called geonets are used for the bottom lining functioning primarily as a drainage layer. They are characterized by their low compressibility tunder conditions of overpressure of waste deposited above. Geomembranes with chemical and mechanical stability serve as barriers against leachates and other emissions. Natural clays are also used due to their sorption capacity, however their application depends on their exact mineralogical composition. Geosynthetic clay liners (GCLs) have permeability at least 4.5 × 10-11 m.s-1 and serve as a protective layer against contamination of groundwater, but also protect the lining in the layers below. To increase the efficiency of this layered system, a drainage layer is commonly added, which also helps to minimize the pressure effects of landfill leachate on the...
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Study of Pipe Drain Construction
Navrátil, Petr ; Bernatík, Radek (referee) ; Svoboda, Richard (advisor)
Mixing of backfill of the pipe drain construction with sub-ballast layer material through using enclosed drainage systems (mostly by pipe drains) has to be prevented. In order to do so, regulation SŽDC S4 Železniční spodek provides a filtration criterion which needs to be fulfilled or a geotextile with filtration function has to be used. This master thesis verifies if filtration criteria are fulfilled in between different backfilling of the pipe drains and sub-ballast layers in compliance with TNŽ 73 6949. Furthermore a verification of filtration function of different geotextiles including propositions of their suitable placement within construction of the pipe drain system is included.
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Intermezzo - Center for Parents and Children
Halbrštátová, Lada ; Havířová, Zdeňka (referee) ; Lavický, Miloš (advisor)
Abstract The main purpose of creating this object was to create a place where people having bad living situation will meet people who live regular lives. This is the reason why two floors were projected. The first floor is designed for social activities whereas the second floor is a housing part with apartments. The advantage of irregular but compact shape of the building is perfect connection between its functional parts. The object does not have any basement and it is placed in a little slopy bulit-up surroundings on the crossing of Tyršova and U Distance streets in Letohrad town. On the first floor there is a main entrance, a coffee, massages, a recreation hall, an art working-room, a gym, changing rooms, administration and the technological background of the object. The second floor does not cover a whole area of the first floor. Apartments, laundry room and drying room are situated here. One of the apartments here is projected as barrier-free as well as whole first floor. Both floors are connected by central staircase with shape of „U“ and an elevator. Roofing of the object is realized by single layered flat roof with classic layer order. The gym is roofed by a flat roof held by glued laminated girders. The construction was projected with regard to synergy of all used materials and systems. The chosen solution of object with two floors (both above the terrain) makes the building pretty marked when looking at it’s location, however it makes the place more integrated and uniform.
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Design of special asphalt mixtures SAL for the repair of cement concrete pavements
Kalfeřt, Martin ; Špaček, Petr (referee) ; Varaus, Michal (advisor)
In this thesis layer with increased resistance to crack propagation (SAL) are designed. The theoretical part describes the SAL layer, further the input materials, their production and design of various mixtures. The following is a description of the tests, which include tests of permanent deformation, crack propagation, low-temperature characteristics, test, flexural strength and relaxation. After the test results and conclusion are stated.
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ASI-I modul for lift control boxes
Cseri, Peter ; Fiedler, Petr (referee) ; Štohl, Radek (advisor)
In the first part of my thesis, I was studying materials about AS-Interface network. Then I designed connections between ASI chips and microcontroller that controls the elevator’s control panels. After that I designed all that on double layer board using Eagle layout editor 4.12r2. After that I completed the boards with all electronics circuits and electric components. Then I had to program microcontrollers and microchips for use. These control panels and programs are my final products of this project.
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Electrodes for lithium-ions batteries based on LiCoO2
Nejedlý, Libor ; Čech, Ondřej (referee) ; Sedlaříková, Marie (advisor)
This master´s thesis deals with electrodes for lithium-ions batteries based on LiCoO2. The first part of the project is devoted to the characteristics of Li-ion batteries, electrochemical reactions and characteristics of electrode materials. The next part describes an experiment that deals with the effects of NA doping on performance of layered materials for lithium secondary batteries. The materials were measured by cyclic voltammetry, impedance spectroscopy and galvanostatic cycling.
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Influence of Mn ionts in nickel hydroxide on behavour electrodes
Cirkovský, Jaroslav ; Vrbický, Jiří (referee) ; Sedlaříková, Marie (advisor)
The aim of my diploma thesis was to explore the influence of manganese ions put into nickel nitrate structure. The attention was focused mainly on the stabilization of nickel nitrate a modification, which could not change into b modification. The theoretical part of my thesis focused on applied materials, kinds of acumulators, basic parameters of acumulators and the description of chosen methods of measurement employed. It contained the electrodeposition, the impedance spectroscopy and the cyclic voltammetry. The task of the experimental part was to measure the effect of manganese ions put into potassium hydroxide structure. Proportions of Ni (nickel nitrate) : Mn (manganese nitrate) 10:0, 7:3, 5:5, 6:1 and 6:4 were blended for the measurement. By means of the electrodeposition, there was a thin layer of nickel hydroxide with an admixture of manganese ions from nickel nitrate and manganese nitrate dilution put on the nickel plate. After the spread of the thin layer on the nickel plate, the measurement by the method of cyclic voltammetry followed. The next task consisted in trying to add KOH (potassium hydroxide) anionic and cationic surfactant into the dilution.
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