Getasew Admasu Wubetu (Ph.D.),
Assistant Professor of Applied Physics and Electronics,
Head, Department of Physics,
College of Science, Bahir Dar University,
P.O.Box: 3019,
Mobile: +251-911-315841,
E-mail: getasew.admasu@bdu.edu.et or getasew.wubetu2@mail.dcu.ie,
Bahir Dar, Ethiopia
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