[Zhang, Xiao-Hong] Hunan City Univ, Coll Sci, Yiyang 413000, Peoples R China.
[Abidi, Awatef] King Khalid Univ, Coll Sci Abha, Phys Dept, Abha, Saudi Arabia.
[Abidi, Awatef] Monastir Univ, Energy Engn Dept, Natl Engn Sch, Res Lab Metrol & Energy Syst, Monastir City, Tunisia.
[Abidi, Awatef] Sousse Univ, Higher Sch Sci & Technol Hammam Sousse, Sousse, Tunisia.
[Ahmed, A. El-Sayed] Taif Univ, Fac Sci, Math Dept, POB 11099, At Taif 21944, Saudi Arabia.