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Intrinsic noise within viscous solids and impact on material exploration

Authors: Lin Fa,Shuangshuang Meng,Huiting Yang,Jinyue Li,Yaming Hu,Kaiqiang Zhang,Yulin Xu,Meishan Zhao
Publisher: Frontiers Media SA
Publish date: 2025-3-17
ISSN: 2296-424X DOI: 10.3389/fphy.2025.1554969
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Figures 3 and 4 present the time-domain waveforms, amplitude spectra, and phase spectra for particle vibrations in shale, M-sandstone, and C-sandstone under different viscosity conditions. 

The amplitude spectra indicate that the center frequency remains unaffected by viscosity, but the amplitude decreases as viscosity increases. Were there any non-linear deviations observed at higher viscosity values? How do these findings compare with theoretical predictions from the proposed spring-damping model?

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1 week, 3 days ago

The phase spectrum (Figures 4c and 5c) undergoes a significant shift at the center frequency. Was this shift consistent across multiple trials, and could it be linked to microstructural differences between rock samples?

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