Affiliation: | a Department of Chemical Engineering, Faculty of Engineering, Sebelas Maret University, Jl. Ir. Sutami 36 A, Surakarta, Central Java 57126, Indonesiab Department of Physics, Faculty of Mathematics and Natural Sciences, Diponegoro University, Jl. Prof. Dr. Soedarto, Tembalang, Semarang 50275, Indonesia |