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ST2D - Software for Determination of Total Strains on a Surface
Vavřík, Daniel
The new optical method of the total strains zone shape and size identification on a surface named "Method of Deformed Circles" was developed in ITAM CAS. Method is based on the optical observations of deformations of hexagonal grid on the specimen surface. Related software ST2D on Windows platform can determine field of strains, stress and energy.
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Degradation of protective effect of surface layer on Ni3Al-Cr in hydrogen environment
Čermák, Jiří ; Rothová, Věra
Protective effect of surface layer on Cr-doped (4 and 8 at. % Cr) Ni3Al intermetallic was studied by high-temperature hydrogen permeation tests that were carried out at temperatures in the interval 775-1223 K. Hydrogen with about 1 vol. ppm O2 and 2 vol. ppm of H2O was used for the gas-permeation tests. It was observed that the addition of Cr degrades the - otherwise very good - high-temperature protective ability of oxide-containing surface layer of Ni3Al-Cr at strongly reducing hydrogen environment.
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Modification of transmissivity of hydrogen through the surface of Ni3Al by alloying
Čermák, Jiří ; Rothová, Věra
Hydrogen invasion into Ni3Al-M was studied by gas-permeation method in temperature range 573 - 1 223 K. The dependence of hydrogen permeation flux J(d) through the membrane-like samples on the samples thickness d enabled us to assess the influence of the surface upon the rate of permeation. The surface transmissivity was introduced as a quantitative characteristic describing the rate of the process. Influence of three modifying elements M = Fe, Cr and Zr was studied. It was found that Zr supports and, on the contrary, Cr eliminates the inhibiting effect of the surface. The iron did not alter significantly the hydrogen transmissivity, and it causes enhanced grain boundary brittleness in hydrogen environment.
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Analýza úbytku hmoty kloubních jamek
Mandát, Dušan ; Nožka, Libor ; Hrabovský, Miroslav
Použití 3D optické skenovací topografie je jednou z možných metod analýzy deformace umělých jamek kyčelních kloubů. Cílem měření je určit úbytek kloubního materiálu. Skenovaným objektem je polyethylenový kloub ABG1. Umělý kyčelní kloub je tvořen umělohmotnou jamkou obklopenou kovovou klecí, která je spojena s kyčlí pacienta. S dobou užívání deformace kloubní jamky roste.
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Implied Volatility and Smile
Rojček, Jakub ; Pígl, Jan (vedoucí práce)
In this work author speaks a little in generic about financial derivatives. Then he derives the famous Black-Scholes formula using less precise mathematical apparatus. Afterwards, he will analyze a few volatility models and their applications for creating volatility surface, which is the main goal of both theoreticians and practitioners. As we will see, the theory is yet very deep but unconsolidated. Nevertheless, praxis has gained some nearly sufficient approaches.
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