Abstract In view of the influence of variability of low-frequency noise frequency on noise prevention in real life. we present a novel two-dimensional tunable phononic crystal plate which is consisted of lead columns deposited in a silicone rubber plate with periodic holes and calculate its bandgap characteristics by finite element method. The low-frequency bandgap mechanism of the de... https://www.marketingjeunesse.com/product-category/hydrating-jelly-oil/