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All Journal Mechanical Engineering for Society and Industry Indonesian Community Journal
Ahmad Atif Fikri
Universitas Negeri Malang, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Transportation Other

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Application of response surface methodology (RSM) and central composite design (CCD) to optimize of green ammonia production using magnetic induction method (MIM) and nanocatalysts Poppy Puspitasari; Nandang Mufti; Ahmad Atif Fikri; Deny Yudo Wahyudi; Maizatul Shima binti Shaharun; Anisa Ur Rahmah; Diki Dwi Pramono
Mechanical Engineering for Society and Industry Vol 5 No 2 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.13408

Abstract

Ammonia synthesis in conventional industrial plants typically employs fused iron-based catalysts under harsh conditions (temperatures of 400–700 °C and pressures exceeding 300 atm), resulting in significant energy consumption. This study investigates the potential of using a Mn0.8Zn0.2Fe2O4 catalyst, synthesized under varying sintering temperatures and magnetic field inductions, to enable ammonia synthesis under milder conditions. Additionally, process optimization was carried out using Response Surface Methodology (RSM) and Central Composite Design (CCD). Catalyst characterization results indicate that the crystallite size of Mn0.8Zn0.2Fe2O4 increases with higher sintering temperatures. The catalyst exhibits a near-spherical morphology with notable agglomeration. Magnetic property analysis shows that samples sintered at 700 °C and 900 °C display ferrimagnetic behavior, while the sample sintered at 1100 °C exhibits ferromagnetic characteristics. Temperature-Programmed Reduction (TPR) revealed a maximum reduction peak at 788 °C for the catalyst sintered at 1100 °C, indicating enhanced reducibility. Ammonia formation was successfully achieved using a Helmholtz coil-assisted synthesis method, where the produced ammonia was captured in acidic and basic media in the form of NH₄OH and (NH₄)₂SO₄, confirming the catalytic activity of Mn0.8Zn0.2Fe2O4. The RSM model demonstrated high accuracy with an R² value of 99.73%, and residual analysis confirmed normal distribution, validating model assumptions. The optimal synthesis parameters determined were a sintering temperature of 700 °C, magnetic induction of 0.14 T, and a reaction temperature of 28 °C. The minimal deviation between predicted and experimental responses confirms the reliability and predictive accuracy of the quadratic regression model.
Penerapan Alat Bantu Bongkar Shockbreaker Berbasis Hidrolik dan Pneumatik untuk Meningkatkan Produktivitas UMKM Bengkel Shockbreaker Ahmad Atif Fikri; Windra Irdianto; Fuad Indra Kusuma
I-Com: Indonesian Community Journal Vol 6 No 1 (2026): I-Com: Indonesian Community Journal (Maret 2026)
Publisher : Fakultas Sains Dan Teknologi, Universitas Raden Rahmat Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/i-com.v6i1.8639

Abstract

Kebutuhan layanan servis shockbreaker sepeda motor terus meningkat seiring pertumbuhan jumlah kendaraan bermotor di Indonesia. Namun, sebagian besar bengkel skala kecil (UMKM) masih menggunakan metode manual dalam pembongkaran shockbreaker yang membutuhkan waktu lama, tenaga besar, serta berisiko terhadap keselamatan kerja. Kegiatan pengabdian kepada masyarakat ini bertujuan menerapkan inovasi teknologi tepat guna berupa alat bantu bongkar shockbreaker berbasis hidrolik dan pneumatik pada bengkel mitra di Kabupaten Blitar. Metode pelaksanaan meliputi analisis kebutuhan, perancangan dan pembuatan alat, uji kinerja, pelatihan penggunaan, serta pendampingan operasional. Hasil kegiatan menunjukkan bahwa alat berfungsi efektif dengan dua sistem kerja, yakni hidrolik (manual) dan pneumatik (otomatis). Penggunaan alat mampu menurunkan waktu servis dari ±90 menit menjadi ±60 menit per unit, meningkatkan kapasitas layanan dari 4 menjadi 7 unit per hari, serta menaikkan omzet harian bengkel sekitar 75%. Inovasi ini terbukti meningkatkan produktivitas dan daya saing mitra serta berpotensi direplikasi di UMKM otomotif lainnya.
Influence of additive nano calcium carbonate (CaCO3) on SAE 10W-30 engine oil: A study on thermophysical, rheological and performance Dany Ardymas Kurniawan; Poppy Puspitasari; Ahmad Atif Fikri; Avita Ayu Permanasari; Jeefferie Abd. Razak; Diki Dwi Pramono
Mechanical Engineering for Society and Industry Vol. 4 No. 1 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.11724

Abstract

Researchers have used nanomaterials as additives in base oil to improve its specifications, especially to minimize wear and friction during its applications. In this study, calcium carbonate (CaCO3) nanoparticles were selected as an additive to serve as a protective layer between components and anti-wear properties. In this study, calcium carbonate (CaCO3) nanoparticles were selected as an additive to serve as a protective layer between components and anti-wear properties. Nano lubricant samples were prepared using mass variations of CaCO3 and SAE 10W-30 base oil with concentrations of 0.05, 0.1, 0.15, and 0.2%, then homogenized. The nanolubricant samples obtained were analyzed for thermophysical, rheological properties and lubricant performance with the addition of nano CaCO3 in improving the wear resistance of FC25 cast iron. The results of thermophysical and rheological properties analysis suggest that the nanolubricant has better tribological properties compared to base lubricants. The highest values of thermal conductivity, density, and viscosity (40 °C) are 0.139 W/m.K, 812.203 kg/m3, and 106 mPa.s (40 °C). Meanwhile, the highest CoF, disc mass loss, and surface roughness of nanolubricant are 0.0706, 0.0037 grams, and 0.50 µm, respectively. These results indicate that the greatest wear-reducing agent is from the nanolubricant with the addition of CaCO3 nanopowder additives at 0.1 wt% concentration. These results are expected significant insights into the advancement of nano technology-based lubricants in the future.
Co-Authors Anisa Ur Rahmah Avita Ayu Permanasari Dany Ardymas Kurniawan Deny Yudo Wahyudi Diki Dwi Pramono Fuad Indra Kusuma Jeefferie Abd. Razak Maizatul Shima binti Shaharun Nandang Mufti Poppy Puspitasari Poppy Puspitasari Windra Irdianto