Research on Evaluation and Mechanism of Power Grid Reserve Project Based on Matter Element ModelJun Yan, Yuheng Sha, Tiezheng Wang, Yanlai Zhang, Ziwei Zhu, Wenlong Li, Yannan Guo, Wenqi Li, Jing Zhang and Yuqian ZhangE3S Web Conf., 257 (2021) 02002DOI: https://doi.org/10.1051/e3sconf/202125702002