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• W2052131944 abstract "Frequency-dependent attenuation typically obeys an empirical power law with an exponent ranging from 0 to 2. The standard time-domain partial differential equation models can describe merely two extreme cases of frequency-independent and frequency-squared dependent attenuations. The otherwise nonzero and nonsquare frequency dependency occurring in many cases of practical interest is thus often called the anomalous attenuation. In this study, a linear integro-differential equation wave model was developed for the anomalous attenuation by using the space-fractional Laplacian operation, and the strategy is then extended to the nonlinear Burgers equation. A new definition of the fractional Laplacian is also introduced which naturally includes the boundary conditions and has inherent regularization to ease the hypersingularity in the conventional fractional Laplacian. Under the Szabo’s smallness approximation, where attenuation is assumed to be much smaller than the wave number, the linear model is found consistent with arbitrary frequency power-law dependency." @default.
• W2052131944 created "2016-06-24" @default.
• W2052131944 creator A5005880668 @default.
• W2052131944 creator A5071267787 @default.
• W2052131944 date "2004-03-24" @default.
• W2052131944 modified "2023-10-11" @default.
• W2052131944 title "Fractional Laplacian time-space models for linear and nonlinear lossy media exhibiting arbitrary frequency power-law dependency" @default.
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• W2052131944 doi "https://doi.org/10.1121/1.1646399" @default.
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