1. Department of Materials and Metallurgical Engineering, Institut Teknologi Kalimantan, Balikpapan, Indonesia
2. Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
3. Department of Chemical Engineering, Institut Teknologi Kalimantan, Balikpapan, Indonesia
4. Applied Physics, Faculty of Science, Universiti Brunei Darussalam, Bandar Seri Begawan, Brunei
5. Faculty of Forestry, Mulawarman University, Samarinda, East Kalimantan, Indonesia
6. Geography, Environment & Development, Faculty of Arts and Social Sciences, Universiti Brunei Darussalam, Bandar Seri Begawan, Brunei