The particle size effect on the coordination number in nanoparticles is much stronger for more distant coordination shells than for the first nearest neighbor shell. We show, using the EXAFS analysis of carbon-supported Pt and Pt-Ru nanoparticles, that it is possible to analyze the structure of monoand heteroatomie particles through the 4 ~ shell by taking into account multiple scatterings, and...

INTRODUCTION This paper contributes to the modeling and auralization of diffraction which is one of the most important acoustic phenomenon caused by the wave nature of sound. However, most room acoustic modeling algorithms rely on geometrical acoustic techniques which completely neglect the diffraction. The reason for this is that such methods as ray-tracing [1], beam-tracing [2] and image-sour...

a combined adaptive tetrahedral tracing and edge diffraction model" (2014). A major challenge in architectural acoustics is the unification of diffraction models and geometric acoustics. For example, geometric acoustics is insufficient to quantify the scattering characteristics of acoustic diffusors. Typically the time-independent boundary element method (BEM) is the method of choice. In contra...

Edge diffraction can be introduced into Geometrical Acoustics mainly by three models: detour-based, energetic and wave-based diffraction models. In the past, we thoroughly compared Maekawa's detour law, the uncertainty relation based diffraction method and the secondary source model by the example of edge diffraction of a single wedge. However, the influence of the wedge shape has not yet been ...

In order to improve the precision of vision inspection system for micro accessory, edge detection technique of micro accessory was studied. Firstly, the imaging features of the micro accessory inspection system were analyzed. Fraunhofer diffraction happens, because the light wave is restricted by microscope. Secondly, optical characteristics of micro images were analyzed. The gray curve of the ...

Calcium fluoride nanoparticles with special amount of cerium ion (%1) were synthesized by coprecipitation. Fourier transforms infrared spectroscopy (FTIR), X-ray diffraction (XRD), absorption and photoluminescence (PL) from CaF2Ce nanoparticles has been investigated. FTIR spectra reveal that there are some amounts of OH, NO3 and other organic functional groups on the parti...