Vol. 29 No. 1 (2023)

Suspension preheater is a raw mix pre-heating equipment used in a cement plant. The heat is used to raise raw mix temperature up to 800 0C -900 0C. The process results in an 80-90% degree of calcination. In this project, an increasing percentage of calcination in suspension preheater and reducing the load in the kiln is attempted, by including the calciner in suspension preheater. This project will focus on a suspension preheater system with a separate line calciner (SLC) at Cement Plant with 5000 ton per day (TPD) capacity. Calciner in existing conditions will be modified by extending its…

Smart Microgrid (SMG) is a hybrid system based on renewable energy which can use biofuel, taking advantage of local resources, as one of its energy sources. This study was conducted to determine the effect of using pure tamanu oil and pure coconut oil on engine performance, emissions, as well as their effects on particular components before and after endurance testing. The experiments were done using a diesel engine at speeds of 2200 rpm. In this study, engine performance and emission tests were done before and after the accelerated endurance tests, with loads of 800 W to 4000 W. The…

The Smart Microgrid (SMG) can be used as a solution to overcome problems with electrical distribution on remote islets. The SMG system allows for a combination of conventional and renewable energy for power generation. Biofuel was chosen as a renewable energy source because of its abundant availability and ease of mobilization. This study examined the performance of B-20, Pure Tamanu Oil (PTO), and Pure Coconut Oil (PCO) in an IDI diesel engine that acts as a backup for SMG systems in the Karimunjawa Islands. The entire SMG system consists of: diesel engine, stabilizer, inverter, PV,…

Sandwich composites have been used as lightweight materials in aircraft manufacturing for a long time, from balsa wood sandwich in the 1930s to honeycomb and fiber-reinforced polymers sandwich. Its characteristics are considered as a 'perfect' material for aircraft, which has high strength with low density. Sandwich composites are the common materials for aircraft floor panels. The core is usually made of Nomex or aluminum honeycomb, while the skin is made of 1 "“ 2 ply of carbon/glass fiber in epoxy resin composite. The core is usually constructed using the corrugating or expansion method,…

Anticlimber merupakan komponen pengaman untuk meningkatkan aspek crashworthiness, yang berfungsi khusus mencegah terjadinya fenomena overriding (tumpang tindih) saat tumburan kereta api yang dapat menyebabkan dampak jatuhnya korban jiwa yang signifikan. Sebagai rangkaian riset dan pengembangan untuk menerapkan teknologi crashworthiness pada kereta penumpang nasional, dikembangkan rancangan anticlimber yang sesuai dengan kereta penumpang produk industri nasional saat ini. Rancangan menggunakan konsep ribs terpisah yang dipasang pada kedua ujung kereta tepat di kanan dan kiri coupler.…

Implant is one of the most important innovations in medical devices to help people with disabilities or injuries, one of them is the hip-joint implant. The hip-joint implant must-have properties such as good corrosion resistance, good biocompatibility, and good wear resistance. These properties are important for maintaining safety during surgery and future use. Nickel-free 316L stainless steel is one of the materials that is commonly used as implants and meets all the requirements for a material to be used as an implant. 316L stainless steel also has an advantage, a lower price than titanium…