9:30 AM - 9:45 AM [8a-Z09-3] Design of Broadband Sound Absorption Device based on Acoustic Metasurface with Multiple Resonance and Its Application to Energy Harvesting 〇(M2)Keita Watanabe1, Mikiya Fujita, Masaaki Misawa1, Kenji Tsuruta1 (1.Okayama Univ.)