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Study of structural and mechanical properties of dendrimers
Ščudlová, Jolana ; Legut,, Dominik (referee) ; Žídek, Jan (advisor)
This thesis deals with the research on organized supermolecular structures. These structures are present in many polymeric materials. Mainly in bio-materials, they cause biological activity. Collagen fibril and dendrimers are suitable materials for molecular modeling. Collagen is natural protein with long, fibrous structure. Its fibrils show high elasticity. This property makes the material useful for certain applications. Dendrimers are synthetic macromolecules with regular and highly branched architecture. Modeling of their properties can be useful for improvement of various molecular models. The molecular structure of collagen fibril and dendrimers was studied by molecular dynamics simulations. The structures were built in the GROMACS software. Elastic deformation of collagen fibril was investigated. In case of dendrimers, shape and gyration radii were calculated from molecular models. Properties of these two materials are well described in literature. Therefore, modeling results can be compared to experimentally measured properties.
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Uncoated cemented carbides
Benešovský, Radek ; Sedlák, Josef (referee) ; Humár, Anton (advisor)
This bachelor thesis deals with the uncoated cemented carbide used in the manufacture of cutting tools. There is an overview of the most frequently used tool materials in the first part. The second part describes history, sorting, labeling and physico-mechanical properties of uncoated cemented carbides. The last part is focused on products of Pramet Tools, Sandvik Coromant, Seco Tools, Ceratizit, Walter and Iscar and their comparison in terms of cutting speed.
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Study of the influence of process parameters on welding properties of ferritic stainless steel in laser oscillation welding
Křepela, Petr ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
The aim of this work was to carry out an experiment to assess the influence of the individual welding parameters in the laser welding method with the beam wobbling on the made weld, respectively. welds. The material which was welded was ferritic stainless steel with the designation 1.4016, which, like all ferritic steels, is susceptible to coarse grains and the resulting brittleness which leads to degradation of the mechanical properties of the weld. The welds were compared to a sample welded without wobbling an between themselves. Unfortunately, however, the evaluation of the test samples did not bring significant differences from laser welding without wobbling, however some changes are evident, such as grain orientation, weld defects, or uniformity of mechanical properties over the weld length, where wobbling frequency is most important. Further research should focus on limiting the porosity at higher wobbling frequencies in the shape of a circle or ellipse.
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Measurement of the properties of cells grown in hydrogel
Belák, Daniel ; Janoušek, Oto (referee) ; Čmiel, Vratislav (advisor)
Main subject of this work is to present the possibilities of cultivation of cells in cultivation medium – hydrogel. Topic of the following part is introduction to the problematics of processing of the pictures made by light field microscopy and fluorescence microscopy. It studies the influence of parametres used in the process of stacking the pictures to reach the highest depth of field as possible. Last part is dedicated to measurement of the properties of cell cultures, its statistical processing and analysis.
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Tool steels
Bíza, Michal ; Němec, Karel (referee) ; Molliková, Eva (advisor)
The bachelor thesis deals with the types of steel that are used to produce working tools. There is a classification and the characterization of the most frequently used tool materials in the first part. The second part describes the classification of tool steel according to various criteria, a tool steel production, heat treatment, the structure and the properties of steel used for tools. The last part is focused on the description of the types of tool steel that are classified according to their use in practice.
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Wood as a construction material
Lauš, Ladislav ; Molliková, Eva (referee) ; Němec, Karel (advisor)
The aim of this bachelor’s thesis is to elucidate the structure and properties of wood as a material. It includes the most important facts about wood. It describes the concrete macroscopic and microscopic structure, focusing on the physical and mechanical properties. The main part of the thesis deals with a constructional use of wood. It provides information on the suitability of wood for construction.
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Cermets
Medůsek, Milan ; Dvořáček, Jan (referee) ; Humár, Anton (advisor)
This bachelor´s thesis is focused on cermets, which are ranked among tool materials. At the beginning is an overview, distribution and description of the basic materials for cutting tools. The main part follow, which deals with cermets themselves in more detail, from the description of their history through to the production and marking up of the effects of individual elements of the structure and properties of the cermets. In the conclusion of this work is an example of cermets in the manufacturing range of the world´s leading producer of tools and tool materials.
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Coated cemented carbides and their effective use
Pavlovský, Tomáš ; Dvořáček, Jan (referee) ; Humár, Anton (advisor)
This thesis deals with coated cemented carbides, which are used for the manufacture of cutting tools. The introductory section provides an overview of the most common tool materials. The main part focuses on the production of coated SK, coating methods, types and properties of coatings. The final section deals with coated cemented carbide product range in the world's leading producer of tools and tool materials, tools and recommended working conditions for their effective use.
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Study of effect of the introduced parameters to aerate of aerated concrete
Urbánek, Libor ; Voves, Jiří (referee) ; Hubáček, Adam (advisor)
Bachelor thesis is focused on aerated concrete, their parameters of composition and properties. Further, the thesis focuses on the study of the effect of the introduced aeration on fresh concrete on its properties in both fresh and hardened state. Emphasis is placed on the assessment of the aeration rate in fresh concrete, as compared to the various parameters of hardened concrete, especially the content of hardened concrete and the durability of concrete. The study is complemented by a description of air pore distribution tests in fresh and hardened concrete, a description of individual aeration additives and a study of the influence of aeration additives on the durability of concrete.
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