Analisis pengaruh konsentrasi NaOH pada proses Bayer terhadap ekstraksi bijih nepheline = Effect of NaOH concentration in Bayer process on extraction of nepheline ore in Bayer process

Studi pengaruh penambahan batubara pada proses roasting reduction bijih nikel saprolit dan pelindian (leaching) dalam larutan asam sulfat 1 molar = Study of coal addition effect on roasting reduction process of saprolitic nickel ore and leaching in sulfuric acid 1 molar

Pengaruh temperatur austenisasi dan waktu tahan terhadap perubahan ukuran butir dan kekerasan pada baja HSLA A 572 Grade 50 = The effect of austenitization temperature and holding time of change of grain size and hardness on the HSLA steel A 572 grade 50

Pengaruh konsentrasi lixiviant dan waktu pelindian bijih malasit dengan ammonium bikarbonat = Effect of lixiviant concentration and leaching time malachite ore in ammonium bicarbonate

Pengaruh konsentrasi ubi ungu sebagai inhibitor ramah lingkungan untuk material baja karbon rendah dalam larutan NaCl kadar 3,5% pada temperatur 50°C = The effect of concentration purple sweet potato as green inhibitor of low carbon steel material in NaCl solution levels of 3.5% at 50°C temperature