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New piezoelectric moduli of wood: d 31 and d 32

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Figure

Fig. 1. Defi nition of piezoelectric moduli. a Rectangular coordinates assigned to wood, b the cutting of wood specimens for d′31
Fig. 5. Variation of piezoelectric modulus pith to bark. crossesYezo spruce; linesd′31(45) of softwoods from Open triangles, loblolly pine; open diamonds, redwood; , Japanese cypress; solid diamonds, long leaf pine; open circles, open squares, Japanese cedar; plus signs, Douglas fi r; solid , regression lines
Figure 5 shows the variations of dspecies of softwoods shown in Table 1. The absolute value of ring number in each softwood
Fig. 9. Anisotropy in piezoelectric modulus curves of d′31(θ) and approximate d′31(θ) for softwoods
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