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Sound absorption of laminated biopolymer foam and epoxy foam

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Figure

Fig. 1. Biopolymer laminated epoxy foam
Table 1. Thickness ratio of Biopolymer foam and Epoxy foam
Fig. 3 Sound absorption coefficient of biopolymer laminated epoxy foam with different thickness ratio (A) Sample of Epoxy foam near the loudspeaker (B) Sample of Biopolymer foam near the loudspeaker

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