| http://www.w3.org/ns/prov#value | - This research line is motivated by the fact that piezoelectric coefficients in d33 and d15 modes are higher than d31 ones (Table 1), so this can possibly lead to devices with higher output power. d33 vibrating generators can be used, for example, in industrial fields such as automotive and machinery or wherever there are mechanical joints that, due to tolerances, show relative movements between st
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