We propose a novel mechanism to test time variation of the propagation speed gravitational waves (GWs) in light GWs astronomy. As stochastic experience whole history cosmic expansion, they encode potential observational evidence such variation. report that, one feature varying is that energy spectrum will present resonantly-enhanced peaks if oscillates at high-energy scales. Such oscillatory be...

We consider the problem of audio source localization in a medium with unknown characteristics, particularly the speed of sound within the medium. We propose an algorithm to retrieve both the speed of sound and the localized signals under reasonable assumptions such as smoothness of medium structure. We present initial simulation results for stationary sinusoidal sources both for the case of uni...

We consider the problem of audio source localization in a medium with unknown characteristics, particularly the speed of sound within the medium. We propose an algorithm to retrieve both the speed of sound and the localized signals under reasonable assumptions such as smoothness of medium structure. We present initial simulation results for stationary sinusoidal sources both for the case of uni...