Wrocław University of Technology

About: Wrocław University of Technology is a education organization based out in Wrocław, Poland. It is known for research contribution in the topics: Laser & Fuzzy logic. The organization has 13115 authors who have published 31279 publications receiving 338694 citations.

Non-destructive and semi-destructive diagnostics of concrete structures in assessment of their durability

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Characterization of mechanical properties of suspension plasma sprayed TiO2 coatings using scratch test

Abstract: The study aimed at characterizing mechanical properties of TiO2 coatings obtained by the use of aqueous suspensions of fine rutile and anatase particles onto metal substrates. Thickness of the coatings was found with the use of optical microscope observations of metallographical cross-sections. The coatings morphology was found with scanning electron microscope (SEM) and their phase composition was determined by X-ray diffraction method. The mechanical properties were characterized using scratch test. The test enabled to characterize the adhesion of coatings by determination of critical force necessary to peel off the coatings from the substrate and, on the other hand, to estimate their cohesion by the measurement of the scratch hardness. The hardness was calculated using the width of the scratch and the value of force applied. The design of experiments (DOE) of spraying with the use of a 23 full factorial plan was applied to rutile powder. The coatings were sprayed onto aluminium substrate. The DOE enabled to find the effects of three principal parameters, i.e. electric power input to plasma, spray distance and suspension feed rate onto coating adhesion expressed by critical force. A preliminary data for anatase powder sprayed with one set of operational parameters onto stainless steel substrate are also shown.

On problems of multicomponent system maintenance modelling

Abstract: We present an overview of some recent developments in the area of mathematical modeling of maintenance decisions for multi-unit systems. The emphasis is on three main groups of multicomponent maintenance optimization models: the block replacement models, group maintenance models, and opportunistic maintenance models. Moreover, an example of a two-unit system maintenance process is provided in order to compare various maintenance policies.

Charging and infrared spectroscopy of self-assembled quantum dots in a magnetic field.

Abstract: The few-electron states of the lens-shaped self-assembled quantum dots in the magnetic field are studied. The calculated charging and infrared absorption spectra reflect the magnetic-field-induced transitions between different states of interacting electrons. The theoretical results compare well with recent experiments by Drexler et al. [Phys. Rev. Lett. 73, 2252 (1994)]. New features are predicted to occur at higher magnetic fields. \textcopyright{} 1996 The American Physical Society.