Enhancing Biodiesel from Kemiri Sunan Oil Manufacturing using Ultrasonics Slamet Supriyadi, Purwanto Purwanto, Didi Dwi anggoro and Hermawan E3S Web Conf., 31 (2018) 02014 Published online: 21 February 2018 DOI: 10.1051/e3sconf/20183102014