National Repository of Grey Literature 11 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Metastable iron thin films for magnetic metamaterials
Holobrádek, Jakub ; Man, Ondřej (referee) ; Urbánek, Michal (advisor)
Magnetické nanostruktury mají zajímavé vlastnosti, které umožňují jejich aplikace v základním výzkumu i průmyslu. Jednou z těchto vědeckých disciplín je i magnonika - výzkumný obor, který se zabývá fyzikou spinových vln, které lze použít v nediskrétních výpočtech s nízkými ztrátami energie. Výroba magnetických struktur fokusovaným iontovým svazkem (FIB) je alternativní metoda k běžně používaným litografickým metodám. Materiál použitý v této práci - metastabilní železo - je schopen při ozáření iontovým svazkem podstoupit fázovou transformaci z paramagnetické plošně centrované kubické krystalové struktury na feromagnetickou fázi s prostorově centrovanou kubickou krystalovou strukturou. Jednou z vlastností, která ovlivňuje šíření spinových vlny, je magnetická anizotropie. Tato práce představuje vliv depozičních podmínek v ultra vysokém vakuu během přípravy metastabilní železné vrstvy na magnetickou anizotropii struktur vytvořených pomocí FIB do tohoto filmu. Dále prezentujeme souvislosti mezi parametry FIB, krystalografickými vlastnostmi výsledných struktur a jejich magnetickou anizotropií.
Preparation of ultra sharp tips for STM TERS applications
Šilhan, Lukáš ; Man, Ondřej (referee) ; Jan, Vít (advisor)
The goal of this bachelor thesis is preparation of Au tips by electrochemical etching. The theoretical part deals with comparison of microscopy techniques for materials surface characterization and Raman spectroscopy. The experimental part is focused on the settings of optimal etching parametres to gain appropriate geometry of fabricated tips. Function of tips is verified by evaluation of data gained by experimental measuring with this tips. Prepared tips are suitable for applications such as STM and TERS.
Application of Electron Backscatter Diffraction in Materials Engineering
Man, Ondřej ; Vodárek, Vlastimil (referee) ; Svoboda, Milan (referee) ; Švejcar, Jiří (advisor)
The thesis deals with principles and common applications of the electron backscatter diffraction (EBSD) method. Some practical experience in application of the method to a study of highly deformed structure of copper and its thermal stability is described on one hand, and, on the other hand, to a study of phase composition of TRIP steel on various levels of imposed strain. The limitations of EBSD method are discussed along with its resolution in comparison with other complimentary techniques.
Analysis of Strain - induced Variations of Phase Composition of the TRIP Steel using EBSD Method
Pešina, Zbyněk ; Pantělejev, Libor (referee) ; Man, Ondřej (advisor)
The diploma thesis deals with phase composition measurement of the TRIP steel, using EBSD method. The steel was delivered as thermo-mechanically treated via two different routes. The phase composition of the steel was examined during gradual plastic deformation in the range 0 to10.99%. One route of thermo-mechanical treatment exhibited good agreement with the literature in terms of measured fraction of the retained austenite (15.6%) as well as its decrease during the deformation (to 8.9% at the maximum imposed strain). The samples of the second route did not show any agreement in either of the parameters spoken.
Failure analysis of the space shuttle Columbia
Neduchal, Ondřej ; Man, Ondřej (referee) ; Pantělejev, Libor (advisor)
Bachelor´s thesis is focused on the analysis of the space shuttle Columbia accident. Text firstly generally discusses materials used in aviation and cosmonautic, specifically composite materials. These are discussed firstly in general and then is the thesis focused on their strength and dynamic properties. Second half of the thesis describes the course of the last flight of the space shuttle Columbia and its subsequent demise. Emphasis is placed on the cause of the accident in which plays a crucial influence the material on the surface of the wing.
Assessment of probable causes of corrosion damage of a mould made of cast iron
Sobola, Petr ; Pantělejev, Libor (referee) ; Man, Ondřej (advisor)
Bachelor’s thesis deals with solution of problems on glass moulds, which were exposed to the corrosion medium for up to two days causing their damage. The thesis contains theoretical analysis of the problem, layout for the corrosion experiment and its execution. Based on the experiment a conclusion was pronounced that the extent of damage which was observed was not able to be created by corrosion of initial surface without any previous defect.
Assessment of probable causes of corrosion damage of a mould made of cast iron
Sobola, Petr ; Pantělejev, Libor (referee) ; Man, Ondřej (advisor)
Bachelor’s thesis deals with solution of problems on glass moulds. Those moulds were exposed to the corrosion medium for up to two days which caused their damage. The thesis contains theoretical analysis of the problem, layout for the corrosion experiment and its execution. Based on the experiment a conclusion was pronounced that we cannot definitely say that 48 hours were enough to achieve as high the damage as was observed.
Assessment of probable causes of corrosion damage of a glass-shaping mould
Jíša, Jakub ; Pantělejev, Libor (referee) ; Man, Ondřej (advisor)
The aim of this thesis was to characterize briefly the issue of electrochemical corrosion in the aquatic environment with a focus on cast-iron corrosion and then decide whether the observed damage to the glass-forming mold could arise in the course of two days. A simple corrosion experiment was made in which samples of cast-iron were exposed to the shower of water for 48 hours. Corrosion damage under simulated conditions did not reach the level of damage of the mold.
Microstructural stability of Mg-alloys prepared by severe plastic deformation
Piňos, Jakub ; Man, Ondřej (referee) ; Pantělejev, Libor (advisor)
SPD methods allow to obtain ultra-fine-grained structure (UFG) in larger volumes of material and thereby improve its mechanical properties. The microstructure obtained by these methods is thermally unstable, so use of UFG materials at elevated temperatures is limited. Heat exposure leads to grain coarsening and the deterioration of mechanical properties. This work is focused on the thermal stability of Mg-alloys of AZ group.
Oxidation barriers prepared by electrochemical procedures
Mengyan, Tomáš ; Man, Ondřej (referee) ; Jan, Vít (advisor)
The presented bachelor thesis deals theoretically with use of anodization procedures for preparation of self-organized porous oxide layers on aluminium. The techniques leading to different pore structures are summarized and the use of porous anodic alumina in various applications of nanotechnology are mentioned. The thesis is composed as initial entry-level theroretical study for prospective experimental work in the field of porous anodic alumina.

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