Negative refraction of elastic waves has been studied and experimentally demonstrated in three- and two-dimensional phononic crystals, but Bragg scattering is impractical for low-frequency wave ...

So far we have only considered sound in isolation and we have seen that sound has velocity, frequency, wavelength and reduces in intensity in proportion to the square of the distance from the source.

Crossplots of elastic wave velocity and resistivity can identify gas and water zones in tested formations of northwest China's Junggar basin. Crossplots of elastic wave velocity and resistivity can ...