Figure 12.
Plots of the sound absorption coefficient as a function of frequency for various PVP_SiO2NT disks piles. The a, b, c, d, e and f curves refer, respectively, to samples of total mass 2.25 g, 5.13 g, 7.11 g, 11.24 g, 18.37 g and 28.25 g.
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