Ahmad N. Faris
State University of Malang
Indonesia

Physics Department

Daeng A. Suaidi
State University of Malang
Indonesia

Physics Department

Sutrisno Sutrisno
State University of Malang
Indonesia

Physics Department

Muhammad Fathur Rouf Hasan
State Polytechnic of Jakarta
Indonesia

Civil Engineering Deparment

Agung B. Broto
State Polytechnic of Jakarta
Indonesia

Civil Engineering Deparment