1. Department of Chemical and Environmental Engineering, Faculty of EngineeringUniversiti Putra Malaysia, UPM 43400 Serdang Selangor Malaysia
2. Institute of Advanced TechnologyUniversiti Putra Malaysia, UPM 43400 Serdang Selangor Malaysia
3. Department of Electrical and Electronic Engineering, Faculty of EngineeringUniversiti Putra Malaysia, UPM 43400 Serdang Selangor Malaysia