Cyclic stress-strain behavior of polymeric nonwoven structures for the use as artificial leaflet material for transcatheter heart valve prostheses

Xenogenic leaflet material, bovine and porcine pericardium, is widely used for the fabrication of surgically implanted and transcatheter heart valve prostheses.As a biological material, long term durability of pericardium is limited due to calcification, degeneration and homogeneity.Therefore, polymeric materials represent a promising approach for

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Determination of spectral resolutions for multispectral detection of apple bruises using visible/near-infrared hyperspectral reflectance imaging

This study demonstrates a Freezers method to select wavelength-specific spectral resolutions to optimize a line-scan hyperspectral imaging method for its intended use, which in this case was visible/near-infrared imaging-based multiple-waveband detection of apple bruises.Many earlier studies have explored important aspects of developing apple bruis

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Optical defocus affects differently ON and OFF visual pathways

Car Stereo Summary: The human eye has a crystalline lens that focuses retinal images at different viewing distances.Optical defocus reduces the spatial resolution and contrast of these retinal images and spectacle lenses minify or magnify their size.Because light and dark stimuli are processed with ON and OFF pathways that have different spatial re

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