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All Journal Jurnal Locus Penelitian dan Pengabdian Jurnal Indonesia Sosial Teknologi Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin
Muhamad, Zein
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Aerospace Engineering Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences

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Karakteristik Briket Fly Ash Batubara Berdasarkan Campuran Biomassa Arang Tempurung Kelapa Dan Serbuk Jati Belanda Muhamad, Zein; Pratowo, Bambang; Nawawi, Abdul Rohim
Jurnal Locus Penelitian dan Pengabdian Vol. 4 No. 9 (2025): : JURNAL LOCUS: Penelitian dan Pengabdian
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/locus.v4i9.4810

Abstract

The increasing energy demand and the high amount of coal waste in the form of fly ash encourage the development of environmentally friendly alternative fuels. This study aims to determine the process of making fly ash-based briquettes, assess the water content, ash content, burning time, and compare the characteristics of hardness and calorific value of briquettes mixed with coconut shell charcoal and Dutch teak wood powder. In this study, briquettes were made by mixing fly ash and coconut shell charcoal and fly ash and Dutch teak wood powder with compositions of 20:70, 40:50, 45:45, and 30:60 with a 10% adhesive concentration. The research process was carried out by manually mixing the materials until homogeneous, molding using a block-shaped metal mold, then drying in an oven at a temperature of 100–105°C for 3 hours. Testing methods include testing water content, ash content, calorific value, compressive strength, and burning time. The experimental data are explained comparatively to the composition variations. The results showed that briquettes with a composition of 40% fly ash, 50% coconut shell charcoal, and 10% adhesive produced the highest calorific value of 6,215 kcal/kg and a compressive strength of 2,048 kg/cm², superior to the mixture of teak wood powder.
Analysis of the Effect of Temporal Changes on the Coolant Viscosity of the Pendinggin System on Motorcycles Muhamad, Zein; Surya, Indra; Prayoga, Gilang
Jurnal Indonesia Sosial Teknologi Vol. 5 No. 7 (2024): Jurnal Indonesia Sosial Teknologi
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jist.v5i7.1248

Abstract

A combustion motor is a machine that converts from chemical energy to motion energy, where in the working system of a combustion motor produces power or engine rotation which is produced from the process of combustion in the combustion chamber (cylinder). In addition to producing power and rotation, it also produces heat (thermal) as a result of the combustion process. Excessive heat generated by the combustion process can also cause problems if not overcome properly, can cause overheating. Therefore, a good cooling system such as radiator coolant is needed, in the fluid cooling system there is viscositic (viscosity of the substance) which can affect the absorption of heat. The following are the test results at temperatures of 27.8oC (0.35dpa.s), 70oC (0.275dpa.s), 90oC (0.25dpa.s). If the viscosity value is low, then in the flow rate the faster the heat absorption and heat transfer will be more effective, while if the viscosity value is high, then in the flow rate the slower the heat absorption and heat transfer process becomes ineffective.
RANCANG BANGUN ALAT PINDAH PASIEN MENGGUNAKAN SISTEM REM ELEKTRIK UBL, Mulyana; Akbar Saputra, Fauzi; Muhida, Riza; Riza, Muhammad; Surya, Indra; Kunarto; Muhamad, Zein; Saputro, Harjono; Pratowo, Bambang
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 9 No. 2 (2025): Oktober 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v9i2.45557

Abstract

The mobility of patients with physical limitations is a major challenge in healthcare, particularly in the process of transferring from bed to wheelchair, toilet, or examination table. Based on data from BPS (2023) and Regsosek (2023), the number of people with disabilities and the elderly in Indonesia continues to increase, requiring innovation in assistive devices that are safe, ergonomic, and easy to use. This study designed a transfer chair with a solenoid-based electric brake system to improve the efficiency and safety of the patient transfer process. The research method included needs identification, structural and brake system design, fabrication, and functional testing. The calculation results show that the brake system with four 12V DC solenoids produces a total pressing force of 80 N and a braking torque of 6.10 Nm. Energy consumption for 5 minutes is 1.99 Wh with a minimum battery capacity requirement of 166 mAh. The static stability coefficient of 1.14 indicates the device is stable during use. The device is able to withstand static loads of up to 90 kg without brake function disruption and is in accordance with anthropometric data for the Indonesian population. This design contributes to the development of medical devices that are affordable and responsive to the needs of patients and medical personnel.
Co-Authors Akbar Saputra, Fauzi Bambang Pratowo Indra Surya, Indra Kunarto Muhammad Riza Nawawi, Abdul Rohim Prayoga, Gilang Riza Muhida Saputro, Harjono UBL, Mulyana