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When sampling a stochastic process, the reconstruction may suffer from the reconstruction may suffer from the aliasing of frequency components located outside the Nyquist band. This paper shows that using multiple non uniform sampling schemes allow one to estimate the amplitude and the frequency of any monochromatic wave subjected to aliasing.
Attenuation of ultrasonic waves is often assumed linear with respect to frequency in biological applications whereas it is considered quadratic when the propagation occurs in the atmosphere or the water. In the latter case, other studies show that a Gaussian propagation duration can explain this attenuation behavior and provide a model for the energy loss in the stationary limit. The present paper...
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