Optimizing analysis of coal property using laser -induced breakdown and near -infrared reflectance spectroscopiesYao, Shunchun*; Qin, Huaiqing; Wang, Qi*; Lu, Zhimin; Yao, Xiayang; Yu, Ziyu; Chen, Xiaoxuan; Zhang, Lifeng; Lu, JidongScience Citation Index Expanded中国科学院摘要-关键词CALORIFIC VALUE SAMPLES COMBUSTION TRANSFORM MACHINE SYSTEM IMPACT OXYGEN