Figure (IMAGE) Singapore University of Technology and Design Caption Designs of conventional and sinusoidal (ST and SL) feed spacers. Credit NTU and SUTD Usage Restrictions Credit to NTU and SUTD License Original 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.