Characterizing the evolution of seismicity rate of early aftershocks can yield important information about earthquake nucleation and triggering. However, this task is challenging because early aftershock seismic signals are obscured by those of the mainshock. Previous studies of early aftershocks employed high-pass filtering and template matching but had limited performance and completeness at ...

We consider linear inverse problems where the solution is assumed to have a sparse expansion on an arbitrary preassigned orthonormal basis. We prove that replacing the usual quadratic regularizing penalties by weighted ppenalties on the coefficients of such expansions, with 1 ≤ p ≤ 2, still regularizes the problem. Use of such p-penalized problems with p < 2 is often advocated when one expects ...

Abstract Given an image filter $${{\varvec{y}}}={{\varvec{f}}}\,({{\varvec{x}}})$$ y = f ( x ) , where $${{\varvec{x}}}$$ and $${{\varvec{y}}}$$ are input output images, respectively, rev...

Static electricity is usually generated in the damage area of metal surface due to contact friction, and charge distribution density can reflect size, shape, relative position area. Based on this, a planar array electrostatic sensor designed detect defect this paper, shielding method, number electrodes, electrode arrangement are optimized taking account induced value, uniformity sensitivity ima...