Ren Lab (IMAGE) University of Houston Caption Physicist Zhifeng Ren, center, director of the Texas Center for Superconductivity at the University of Houston, led a project to resolve the problem of asymmetrical thermoelectric performance. Credit University of Houston Usage Restrictions None 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.