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All Journal Jurnal Informatika Ekonomi Bisnis METAL
Prisma Jalu Permana, Antonius
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Control & Systems Engineering Economics, Econometrics & Finance Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisa Korelasi Motivasi Koperasi, Manfaat Koperasi dan Kualitas Pelayanan terhadap Partisipasi Anggota Prisma Jalu Permana, Antonius; Vicka Bayu Wardani, Jovita
Jurnal Informatika Ekonomi Bisnis Vol. 5, No. 1 (March 2023)
Publisher : SAFE-Network

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (541.614 KB) | DOI: 10.37034/infeb.v5i1.219

Abstract

The existence of cooperatives is expected to be able to realize a populist economy that grows rapidly and is just and in accordance with the goals of sustainable development (SDGs). The participation of members of the Kosayu Credit Cooperative is still considered insufficient. This can be seen from the decrease in the number of members' savings and an increase in Non-Performing Loans (NPL) or members' bad loans. The purpose of this study was to determine the effect of cooperative members' motivation, benefits for members, and cooperative service quality both partially and simultaneously on the participation of Kosayu Kopdit members. The population in this study were all members of the Kosayu Kopdit. From the partial hypothesis testing, it is known that the cooperative motivation variable has a positive effect of 16.4%, the member benefits variable has an effect of 36.2%, and the service quality variable has an effect of 21.7% on the participation of Kosayu Kopdit members. While simultaneously, the variables of motivation to cooperate, the variables of benefits for members, and the variables of service quality jointly affect member participation by 40.4% and the remaining 59.6% is influenced by other factors.
EXPERIMENTAL STUDY OF PACK CARBURIZING AND QUENCHING PROCESS WITH TEMPERATURE VARIATIONS (700℃, 800℃, AND 900℃) ON THE MICRO-CHARACTERISTICS AND HARDNESS OF STAINLESS STEEL 316L Angger, Daniel; Crisanto Putra Mbulu , Bernardus; Prisma Jalu Permana, Antonius
Mechanical, Energy and Material (METAL) Vol. 3 No. 2 (2025): Desember: Mechanical, Energy and Material (METAL)
Publisher : Universitas Katolik Widya Karya Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59581/metal.v3i2.141

Abstract

His study aims to investigate the effect of temperature variation in pack carburizing and quenching processes on the microstructure and surface hardness of Stainless Steel 316L. The pack carburizing process was conducted using activated carbon derived from robusta coffee grounds at temperatures of 700°C, 800°C, and 900°C with a holding time of 60 minutes. Subsequently, a quenching process was carried out using oil mixed with activated carbon to lock the diffused carbon. The material was tested for mass change, microstructure (via SEM), and surface hardness (using the Vickers method). The results show that increasing temperature significantly affects carbon diffusion and hardness improvement. The highest hardness value was obtained from the quenching process at 900°C with 330 HV, while pack carburizing at the same temperature resulted in 292 HV. The microstructure revealed more dominant Martensitic formation in the quenching process. Therefore, heat treatment with rapid cooling proves to be more effective in enhancing hardness and modifying the microstructure of Stainless Steel 316L.
THE EFFECT OF NACL AND KOH SOLUTION VARIATIONS ON HYDROGEN PRODUCTIVITY AND CORROSIVITY IN WET HHO GENERATORS USING SS316L ELECTRODES BasunJaya, Akmal Tri; Crisanto Putra Mbulu, Bernardus; Prisma Jalu Permana, Antonius
Mechanical, Energy and Material (METAL) Vol. 3 No. 2 (2025): Desember: Mechanical, Energy and Material (METAL)
Publisher : Universitas Katolik Widya Karya Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59581/metal.v3i2.153

Abstract

The increasing energy demand due to population growth and industrial development has driven the search for clean and renewable alternative energy sources. One promising solution is hydrogen-based energy through water electrolysis, which produces HHO gas (a mixture of hydrogen and oxygen).  The efficiency of the electrolysis process is significantly influenced by the type and concentration of the electrolyte solution used, such as NaCl and KOH, as well as the electrode material here, stainless steel SS316L. This study shows that increasing the mass of the electrolyte solution enhances hydrogen production. NaCl with a mass of 153 grams produced 1,509 ppm of hydrogen at the high-variable setting, while KOH with a mass of 147 grams produced up to 2,320 ppm. However, KOH also caused higher corrosion levels, reaching 0.117 grams in the high-variable setup, compared to NaCl at 0.038 grams. The Cl⁻ and OH⁻ ions in the electrolyte are highly reactive and contribute to electrode surface degradation. Furthermore, the electrode position affects hydrogen productivity, where closer proximity to the power source improves reaction efficiency. Therefore, the selection of electrolyte type and the optimization of the electrolysis system configuration are crucial in the development of efficient hydrogen production technology.
Co-Authors Angger, Daniel BasunJaya, Akmal Tri Crisanto Putra Mbulu , Bernardus Crisanto Putra Mbulu, Bernardus Vicka Bayu Wardani, Jovita