Two piezoelectric solids 1, 2 are separated by a vacuum gap of width d. An incoming acoustic wave from solid 1 (positive z-axis of a laboratory coordinates xyz) with an incident angle θ i tunnels ...
It’s not exactly unusual for a vacuum cleaner to make some noise, but that also makes it easy to tell when the noise takes a troubling shift. Shark vac users may sometimes notice a sudden shift in ...
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