1. Mechanical Engineering Department, Sepuluh Nopember Institute of Technology, Surabaya, Indonesia
2. Research Center for Energy Conversion and Conservation, National Research and Innovation Agency, South Tangerang, Indonesia
3. State Electricity Company, South Jakarta, Indonesia
4. Coal Combustion, Inc., Versailles, KY, USA
5. WASM-Minerals, Energy and Chemical Engineering, Curtin University, Perth, Western, Australia