Huan Liu, Qiang Zhang, Hongyun Hu, Peng Liu, Xiaowei Hu, Aijun Li, Hong Yao*. Catalytic role of conditioner CaO in nitrogen transformation during sewage sludge pyrolysis. Distinguished paper for the 35th International Symposium on Combustion（第35届国际燃烧会议“杰出论文奖”）, 2015