Research Team Photo (IMAGE) University of Houston Caption University of Houston's Zhifeng Ren (PI, left), Xin Shi (graduate student, center), and Shaowei Song (research associate, right) with their homemade energy conversion efficiency measurement system. Credit Please give photo credit to University of Houston. Usage Restrictions Please give photo credit to University of Houston. 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.