1. Optimization of kolong water treatment using advanced oxidation processes (aops) methods and heterogenous catalyst impregnation to remove metals in kolong rn2. Comparison and correlation among measurement results of observatory, hellman, and tipping bucket sensors rn3. Pengukuran kadar hemoglobin (hb) darah dengan metode noninvasif menggunakan laser rn4. Perancangan optical power meter multiā¦