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Application of image analysis in research into geocomposite materials
Ščučka, Jiří
The paper concerns possibilities of the image analysis application to the qualitative and quantitative evaluation of structure and texture of geocomposite materials - the noncohesive rocks injected with polyurethane resins. Understanding the relation between the structure and texture and physical mechanical properties of the materials represents one of the ways, how to determine indirectly probable properties and behaviour of geocomposites formed in practical applications.
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Preparation and properties of nanocomposites based on Zr-Fe
Roupcová, Pavla ; Schneeweiss, Oldřich ; Bezdička, Petr
The spark erosion of the pure Zr and Fe electrodes in hydrogen yielded nanocrystalline powder consisting of the mixture of Zr-rich (Zr3FeH7, ZrO2, and Zr(Fe)) and Fe-rich phases with the mean chemical composition Zr-3.2wt.%Fe. Heat treatment in hydrogen atmosphere at 973K induced phase decomposition and transitions with the final composition of bcc Fe, Zr3Fe, ZrH2 and dominating ZrO2 phases. The result indicates that formation of Fe-rich phase (bcc Fe) embedded in ZrO2 could be possible using an appropriate heat treatment of the as-prepared powder.
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Concatenation
Tondl, Ladislav
The paper aims to study the concept explanation in various spheres of rational human activity, including communication. In explaining concatenation processes with respect to their goal orientation we have to take into account various aspects of the following concepts: compatibility of entities, the domain and limits of their substitution, the structure and rules governing the entities .
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