Schematics and Parameters (IMAGE) Science China Press Caption (a, b) Schematics and parameters of the sonic crystal. (c, d) The band structures of the sonic crystal with r=0 (c) and r=0.1/-0.1 (d), respectively. Credit ©Science China Press Usage Restrictions Use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.