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Using lead-acid accumulators in hybrid electric vehicle regime
Hejdiš, Roman ; Novák, Vítězslav (referee) ; Bača, Petr (advisor)
The master´s thesis discuss characteristics of hybrid electric vehicles and lead-acid accumulators applied in car industry. It compares classic and alternative drive in cars, descibes classification of hybrid drives and its characteristics. Further work disscus lead-acid accumulators which focuses on VRLA accumulators applied in hybrid electric cars. Practical part contains a construction description of negative electrode and experiment, which studied influence of various amount addition of carbon on attributes of these electrodes.
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Durability of alkali-activated systems
Šafář, Martin ; Šoukal, František (referee) ; Kalina, Lukáš (advisor)
Alkali activated binders have the potential to become an alternative construction material to ordinary portland cement binders. This thesis concentrates on durability testing of alkali activated blast furnace slag and fly ash based concrete. The chosen aspects of durability included sulfate resistance, acid resistance, carbonation, freeze-thaw resistance, frost-salt resistance and porosity. Microstructural changes and formation of new crystalline phases were observed using XRD and SEM-EDX analysis. Potential application of the tested material from the durability point of view was evaluated by comparison with a reference ordinary portland cement based concrete.
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Influence of cutting conditions on durability of cutting inserts during turning
Hynčica, Vojtěch ; Fiala, Zdeněk (referee) ; Jaroš, Aleš (advisor)
The aim of present thesis is to determine the influence of the cutting conditions (the cutting speed, the feed, the depth of cut) on wear and durability of cutting inserts during machining process of the Inconel 718 alloy. In theoretical part thesis describes technology of turning, cemented carbides, their production and coating; it also deal with how the wear of the tool arises and how the tool wear progresses. In experimental part of this thesis we describe the cutting material, the machine, the machine tool and the experiment procedures. Measured values showed, that the durability of cutting inserts decreases depending on the cutting speed. We have determined that there is no direct correlation between the tool wear and the (increasing) level of the feed and the depth cut.
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Economical analysis of a cutting tool
Bilavčík, Jaromír ; Humár, Anton (referee) ; Prokop, Jaroslav (advisor)
Bachelor's thesis on ”Economic analysis of cutting tools“ is devoted to economic analysis the costs of acquisition and use of different types of cutting tools, whose use has a significant influence on the economy of production and, inter alia with the costs related to the quality of the final product. Analysis of the applicability of utility properties of instruments that are used in the mechanical machining was analyzed economically advantageous for the company. This criterion must take account of the company when the production technology. Another decision-making criteria should be the final product quality. For firms pursuing the cost of quality throughout the production cycle is of course due to classical periodic sharpening cutting tools - knives, it is preferable to use instruments with tip.
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Ground retaining structure for cut & cover metro station in Qatar
Kočičková, Veronika ; Račanský, Václav (referee) ; Uhrin, Michal (advisor)
The aim of this thesis is to assess the geological conditions and durability of the cut and cover metro station in Qatar. Furthermore, the thesis deals with the construction sequence and structural checks of selected elements of the structure. The geological conditions were evaluated on the basis of an extensive geotechnical investigation that was conducted at the construction site. This research also gave necessary information for durability design. After the assessment of the ground conditions in the thesis, it was possible to choose suitable retaining walls and lateral support system and continue with a plan of construction sequence. A diaphragm wall and mezzanine level prop were chosen for the structural check. In case of the wall, the main load was caused by bending moments of a big significance, therefore the wall was designed to the envelope of these moments obtained from software Plaxis. Furthermore, it was necessary to consider the interaction of bending moments and normal forces for the design of the prop. For both elements, reinforcement of bigger diameters was designed.
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The verification of durability of surface layer by pull-off testing
Fujačková, Hedvika ; Komárková, Tereza (referee) ; Kocáb, Dalibor (advisor)
The theoretical part of this bachelor's thesis defines the basic properties, categorization, and use of the individual components of concrete and presents the properties of fresh and hardened concrete, especially the tensile strength. Furthermore, the thesis addresses the problem of durability assessment of concrete, which depends directly on the quality of the surface layer. The experimental part of the thesis focuses on executing of a pull-off test and examines the surface layer tensile strengths of various concrete mix designs. The thesis examines how the results of the measurements correspond with other published results.
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Development of structural concrete with power plant ash
Ťažký, Martin ; Sokol, Pavel (referee) ; Hela, Rudolf (advisor)
Worldwide production of concrete is increasing, what has a negative environmental load of cement production. That is due to effort in building construction, also concrete production, greater use of the secondary raw materials. Fly ash is the most commonly used secondary raw material. His used has a very good impact on the economy and ecology of production and positively affects on the properties of concrete in both the fresh and hardened state. The aim of this bachelor's thesis was to improve its use in concrete, using a minimum void fraction of dry mix cement-fly ash.
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Life cycle costs of residential building
Biolek, Vojtěch ; Marková, Leonora (referee) ; Nový, Martin (advisor)
The aim of this work is to introduce the topic "Life cycle costs for residential buildings" and a specific example to compare the real cost with the model, resulting in the operating phase of the life cycle of a building, using indicators BLCC. The paper also solved possible replacements for alternative materials selected functional components that can be positively or negatively affect other life cycle costs. These solutions can be used investor to invest in other phases of the life cycle of the building.
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SCC with secondary raw materials
Ťažká, Lucia ; Ťažký, Tomáš (referee) ; Hela, Rudolf (advisor)
Bachelor thesis is focused on the possibility of using secondary raw materials and their application to the production of SCC. Large part deals with impurities of type I and its application results mainly from abroad. Furthermore, this work examines the impact of different types of impurities on the resulting concrete durability in various aggressive environments. The practical part is focused on the use of chemically non-reactive additives of type I instead of the commonly used additives of type II which are used to replace part of cement and the resulting design and manufacture of low-strength SCC using appropriate additives.
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