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The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform

Brian Fidler - One of the best experts on this subject based on the ideXlab platform.

Daniel Ludwigsen - One of the best experts on this subject based on the ideXlab platform.

  • Acoustic and structural resonances of the cajon
    2015
    Co-Authors: Daniel Ludwigsen
    Abstract:

    The cajon is a percussion instrument with origins in 16th century Peru. Literally translated “crate,” the cajon was originally a crate that players sat upon and struck to make rhythmic patterns. The modern version is a wooden box, closed except for a hole in the back Panel. The Front Panel is struck with the hands or one of several types of beaters. The Front Panel is thinner than the others and is often attached with a slightly loose top edge for a snare-like effect. Alternatively, the snare sound is obtained with wires or guitar strings placed against the inside surface of the Front Panel, and these rattle when the Panel is struck. Measurements of acoustic transfer functions with impulse excitation and roving hammer structural measurements explore the acoustic and structural resonances of the cajon with rattling strings removed. Spectra from recordings establish timbral features of the instrument, both with and without the rattling strings. By comparing results from measurements and recordings, the impo...

  • Acoustic and structural resonance characteristics of the cajon
    The Journal of the Acoustical Society of America, 2015
    Co-Authors: John Pehmoeller, Daniel Ludwigsen
    Abstract:

    The cajon is a percussion instrument with origins in 16th century Peru. Literally translated “crate,” the cajon was originally a crate that players sat upon and struck to make rhythmic patterns. The modern version is a wooden box, closed except for a hole in the back Panel. The Front Panel is struck with the hands or one of several types of beaters. The Front Panel is thinner than the others and is often attached with a slightly loose top edge for a snare-like effect. Alternatively, the snare sound is obtained with wires or guitar strings placed against the inside surface of the Front Panel, and these rattle when the Panel is struck. Measurements of acoustic transfer functions with impulse excitation and roving hammer structural measurements explore the acoustic and structural resonances of the cajon with rattling strings removed. Spectra from recordings establish timbral features of the instrument, both with and without the rattling strings. By comparing results from measurements and recordings, the important features of the particular instrument tested in this study are identified, and possible directions for improved the designs are suggested.

Gu Xiao-hui - One of the best experts on this subject based on the ideXlab platform.

  • Study on Influence of Anti-penetration Performance of Composite Target with Scale Effect
    Computer Simulation, 2009
    Co-Authors: Gu Xiao-hui
    Abstract:

    The study of protective to penetration of composite armor whose sandwich laminated material is ploy-rubber ant-penetrated by standard shaped charge has been carried on.The affection of Front Panel and back Panel’s scale effect for "sandwich" kind composite target anti-penetrated by jet on the same stand-off distance based on AUTODYN and Energy-Thickness curve.The result shows that the thickness of the Front Panel change has important affect for the composite target which enervates the jet’s energy and the thickness of the back Panel change has great influence for the abruption of the jet after the jet breakthrough the composite target.The change of the anti-penetration performance for the composite target resisted the jet with the change of Front Panel and back Panel’s thickness can be seen immediately from the E-T curve.The right thickness of the Front Panel and back Panel can be given from the result of calculation and analysis.

Kirk D. Rice - One of the best experts on this subject based on the ideXlab platform.

  • A detailed investigation of the mechanical properties of polybenzoxazole fibers within soft body armor
    Journal of Materials Science, 2009
    Co-Authors: Gale A. Holmes, Michael A. Riley, Walter G. Mcdonough, Kirk D. Rice
    Abstract:

    Using the modified -single fiber test developed by Holmes and colleagues (J Appl Polym 2008 ), a detailed analysis of fibers extracted from soft body armor comprised of polybenzoxazole (PBO) fibers was performed. The data indicate that hydrolytic degradation of these ballistic fibers is accompanied by degradation associated with folding (or fatigue-induced degradation) and an undefined degradation mechanism associated with vest use that appears to target the horizontal yarns of the alternating 0°/90° woven layers. These additional failure mechanisms have the potential to create localized regions in the PBO soft body armor which are significantly lower than the homogeneous degradation expected from uniform hydrolysis. Results also indicate that the absence of ballistic penetrations in the initial study conducted at the National Institute of Standards and Technology may be associated with using the properties of the fibers from the back Panel of a compromised vest as representative of the properties in the Front Panel that was penetrated. Analysis of a field return vest showed the Front Panel to be significantly more degraded than the back Panel.

Aaron Bercovich - One of the best experts on this subject based on the ideXlab platform.

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