Machine learning for prediction and experimental validation of hydrochar characteristics via co-hydrothermal carbonization of sewage sludge and pomelo peel - Jie Li; Chenhui Xie; Junjie Li; Wenrui Hu; Yun Xia; Luxin Wang; Yida Wang; Xiaoyan Cui; Jun Zhao; Qianqian Shang; Jianqiang Chen (Bioresource Technology, 2026)