| 摘要 |
<p>The invention relates to an acoustic structure comprising a layer of material having a first Young's modulus, called intrinsic modulus, and a first density, called intrinsic density, characterized in that the layer comprises at least a first zone (Z1) having said first Young's modulus and said first density and at least a second zone (Z2) buried in the volume of said layer of material and having a second Young's modulus and/or a second density, obtained by implantation and/or diffusion of atoms into the volume of said layer.</p> |
