Vol. 2 No. 4 (2025): December

The December 2025 issue reflect ongoing progress in engineering design, materials processing, and sustainable mobility. One article introduces the design of an ultrasonic cutting horn optimized for robotic thermoplastic trimming, highlighting improved precision and automation potential in manufacturing. Another investigates how heat‑treatment conditions influence the friction behaviour of Aluminium 6063 through ring compression tests, offering insights relevant to forming processes and lubrication control. The final paper examines the design and efficiency of a renewable‑energy‑powered demonstration vehicle propulsion system, focusing on energy conversion and performance optimisation. Together, these contributions showcase practical engineering innovations with applications in automated production, materials engineering, and green transportation, aligning with the journal’s mission to advance technology‑driven solutions.