EFFECT OF FUEL INJECTION ON EMISSIONS OF DIESEL ENGINE FUELED WITH WASTE COOKING OIL BIODIESEL PRODUCED BY ULTRASONIC TRANSESTERIFICATION. - MAKSUM, Hasan; PURWANTO, Wawan; Rifdarmon; ARIF, Ahmad; Andrizal; HASAN, Hanapi; FIRMANSYAH, Sadly M. (Thermal Science, 2026)