Volume 8 Number 2 (2026)

SUMMARY. In an optimization study of an electrostatic precipitator (ESP) for diesel engine emissions by Kurniawan et al., the operating duration was the most significant factor affecting PM_2.5 collection efficiency, while higher voltage and closer electrode spacing improved particulate capture. Wardhana et al. demonstrated that the combination of one-step magnet-edge slotting and stator dummy slots can significantly reduce the cogging torque and unbalanced magnetic pull of low-speed permanent magnet wind generators. Ohee et al. evaluated the performance of 20 kV Edelweiss feeder and reported good voltage regulation with low voltage drop and upstream buses as main contributors to the technical power losses. Yusuf et al. studied the effect of low partial vacuum on the performance of solar still and they found that moderate vacuum improved the condensation efficiency, but maximum evaporation is still dependent on the thermal energy retention. The flow distribution in a collector manifold with 7 inlets was investigated by Justin et al. using Computational Fluid Dynamics (CFD) and the importance of viscosity, turbulence and compressibility on the pressure and velocity distribution was demonstrated. Syaripuddin et al. investigated the effect of NaCl quenching media on AISI 4140 steel and observed that hardness increased with salt concentration because of finer martensitic structures, but corrosion resistance was slightly decreased. Fahrudin et al. used machine learning to predict delayed graduation and discovered that psychosomatic fatigue, commuting distance, and AI assistant dependence are significant predictors. The Random Forest model demonstrated the highest predictive accuracy. Hapidzah et al. studied the effect of moisture content on refuse-derived fuel gasification and reported that the moisture content of the feedstock should be kept at around 20% to significantly improve the cold gas efficiency and syngas quality. Wahyuni et al. used CFD to study passive flow control devices in backward-facing step flow. They found that the cube shape bluff body gives the best enhancement in heat transfer performance despite increasing the pressure loss. Nasrullah et al. evaluated the hydraulic performance of an industrial cooling water system and concluded that the accurate pressure loss analysis and proper pump selection are instrumental to improve the hydraulic efficiency, system reliability and operation performance.