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The influence of rough elements of porous materials on sound propagation characteristics in roughened porous materials is investigated. Rough surface topography on the roughened porous materials is simulated by the fractal geometry theory, in which relative roughness is defined clearly as a function of the fractal dimension, porosity, average diameter and diameter ratio of the hexagonal elements on...
Micro-perforated panel absorber is used in many noise control applications as a next-generation absorbing material. Perforation shapes of micro-perforated panel studied are usually circular in the past. However, in practice, the perforations are often non-circular or irregular shape due to manufacturing techniques. Sound absorption coefficient and absorption bandwidth of the micro-perforated panel...
A simple algorithm based on computational estimates of spectral feature amplitudes in hyperspectral images is described for mapping oxygen delivery in tissue. Features are determined from contiguous image bands spanning the prominent absorption wavelengths of hemoglobin. Pixel values along the z-axis at each image coordinate establish a spectral curve. A reference baseline is obtained by linear interpolation...
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