Instantaneous heartbeat detection is a key parameter in modern vital sign monitoring. Continuous wave (CW) radar systems enable contactless measurements of the vibrations on the human skin effected by ...

This paper considers diffraction of spherical waves on soft, hard, and impedance spheres. Radius of the sphere is assumed to be small compared to acoustic wavelength. Simple uniform asymptotic ...

An engine powered entirely by sound waves — no fuel, no combustion, just pure vibration doing the work. It sounds crazy, but here’s how this mind-blowing tech actually works!