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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
THE INFLUENCE OF INITIAL DEFORMATION ON STRUCTURE AND MECHANICAL PROPERTIES OF P92 STEEL
 Svobodová, M. ; Čmakal, J. ; Horváth, L. ; Chmela, T. ; Sklenička, Václav
The paper deals with materials properties of steel bends. Tubes and pipes, respectively, of P92 steel were hot and/or cold bended. Moreover, the various combinations of tubes/pipes dimensions were chosen. Then, as-bended steel was exposed to a long-term temperature and/or mechanical loading. Investigating the materials behaviour, some structure and mechanical tests on as-exposed bends were carried out. So, this paper summarizes recent results of performed tests including numerical simulations by FEM.
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Calculations of nanocrystalline diamond-covered waveguides based on amorphous silicon
 Jirásek, Vít ; Prajzler, Václav ; Remeš, Zdeněk
Nanocrystalline diamond (NCD) coatings on planar waveguides (WG) in the IR region allow to design optical sensors sensitive to absorbers like proteins or other biomolecules. In this contribution, we present a 2D model of a multi-layer WG developed under FEM (finite element method) simulation software Comsol Multiphysics. The model is based on the modified wave equation solved in the frequency domain and includes optical absorption. It was found that for the single-mode WG working in the narrow region of 1550-2000 nm the silicon thickness must be 150-320 nm. It was found that in order to keep a reasonable signal attenuation, the NCD film must be prepared with the optical absorption coefficient lower than 10 cm-1, being a rather challenging task. Dependencies of the signal attenuation on the NCD film thickness, absorbing layer height, its absorption coefficient and exciting wavelengths are presented.\n
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