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Determining the percentage of recycled plastic content in a plastic product. [PDF]

open access: yesCommun Eng
Zhao Y   +5 more
europepmc   +1 more source

Outdoor ground impedance models

The Journal of the Acoustical Society of America, 2011
Many models for the acoustical properties of rigid-porous media require knowledge of parameter values that are not available for outdoor ground surfaces. The relationship used between tortuosity and porosity for stacked spheres results in five characteristic impedance models that require not more than two adjustable parameters.
Keith, Attenborough   +2 more
openaire   +2 more sources

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