Table 1 (IMAGE) Higher Education Press Caption Comparison of prior PHFE schemes related with our constructions. Credit Haifeng QIAN, Cheng LIN, Qiaohan CHU, Jie CHEN Usage Restrictions none 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.