Mahlia, T.M.I, <span><em>Department of Mechanical Engineering, Faculty of Engineering, Universiti Tenaga Nasional,</em><br /><span><em>43000 Kajang, Selangor, Malaysia</em></span><br /></span>
Mahlia, T.M.I, <span>Department of Mechanical Engineering, Universiti Tenaga Nasional, Selangor<br /></span>
Maiyasya, Annas, Universitas Sumatera Utara