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Evaluation of properties of pyrolysed resins
Halasová, M. ; Chlup, Zdeněk ; Strachota, Adam ; Černý, Martin ; Dlouhý, Ivo
The presented work describes mechanical properties of materials prepared by pyrolysis of polysiloxane resins. The polymeric precursors had different chemical composition. Materials under investigation are predetermined as a matrix for high temperature resistant long fibre composites. An instrumented hardness tester was employed for materials characterisation. The Vickers hardness, Martens hardness and indentation elastic modulus were the key parameters determined from the load-indentation depth curves. Influence of the mechanical properties on the ratio of T and D was established. Indents were observed by using confocal laser microscope.
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Changes and development of digital video
Černý, Martin ; Čermák, Radim (advisor) ; Lisý, Martin (referee)
Final thesis deals with changes and development of digital video from the perspective of ordinary users. The aim is to describe how the amateur technology is getting closer to the professional video processing. This will be achieved by a description of the historical development of digital media and a comparison of amateur and professional technology. The part of thesis also deals with prerequisites for this development, which is the new camcorders, more high-efficiency computers, amateur editing programs and new approaches to video compression. The text provides a brief introduction to the topic of digital video, an overview of current technologies and asks questions about what the implications of this change are and what those changes could mean for the future.
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Porous composites based on siloxane resin for hard tissue replacements
Suchý, T. ; Balík, Karel ; Sochor, M. ; Černý, Martin ; Hulejová, H. ; Pešáková, V.
A composite material based on polysiloxane and first on glass fabrics was prepared. The composite samples were prepared with controlled open porosity, the sizes of which were in the range: i) 0,2-0,4 mm, ii) 0,4-0,6 mm, and iii) >0,6 mm. For further improvement of osseointegration, a powder hydroxyapatite, particle size of 0,005 mm in the amount of 10 wgt %. The effects of surface treatment and hydroxyapatite matrix additives on osseointegration were studied by methods in vitro and in vivo.
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