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All Journal Media Mesin: Majalah Teknik Mesin Justek : Jurnal Sains Dan Teknologi PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat JURNAL CRANKSHAFT Applied Research and Smart Technology (ARSTech) International Journal of Mechanical Engineering Technologies and Applications (MECHTA) AJAD : Jurnal Pengabdian kepada Masyarakat Mechanical Engineering for Society and Industry Sinergi Polmed : Jurnal Ilmiah Teknik Mesin Tropical Plantation Journal Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri Urecol Journal. Part E: Engineering Majalah Teknik Mesin
Ngafwan Ngafwan
Universitas Muhammadiyah Surakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Social Sciences Transportation

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Combustion characteristics of pyrolysis oil droplets from pyrolysis of polyethylene (PE) plastic waste Dody Bimo Aji; Marwan Effendy; Ngafwan Ngafwan
Mechanical Engineering for Society and Industry Vol 5 No 1 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.12763

Abstract

Plastic waste is suspected to be a major contributor to environmental pollution, thus encouraging the need for innovative and effective management strategies to overcome it. Pyrolysis is considered an affordable way to process plastic waste, and even produce useful products in liquid form, which has the potential to be an alternative fuel in combustion engines. This study evaluated the combustion characteristics of pyrolysis oil derived from polyethylene (PE) plastic waste. The pyrolysis process was carried out under controlled conditions, at a furnace temperature of 250°C, a reactor temperature of 400°C, and a condenser temperature of 300°C, processing 1 kg of PE plastic waste. Temperature data was monitored every 10 minutes by installing several thermocouples. The pyrolysis process was able to produce 671 ml of liquid, which was later identified as plastic pyrolysis oil (PPO PE-11) and the rest in the form of residue reached 45 g. The results indicated that PPO PE-11 has a viscosity of 5.93 mm²/s, which is higher than diesel 3.8173 mm²/s. Meanwhile, its density is 0.779 kg/m³, which is slightly lower than diesel. The calorific value of PPO PE-11 is slightly higher than diesel, reaching 11,046.4 cal/g. The droplet scale combustion tests give a shorter ignition delay of 0.6 seconds at 41.28°C for PPO PE-11, compared to 1 second at 52.525°C for diesel, indicating its flammability.
STRUCTURAL AND OPTICAL CHARACTERIZATION OF HEAT-TREATED SIC PARTICLES DERIVED FROM RICE HUSK ASH FOR PHOTOVOLTAIC Riza, Ramzul Irham; Ngafwan; Masyrukan; Krisnoadi, Ridwan; Kurniawan, Adhyaka Billy
Media Mesin: Majalah Teknik Mesin Vol. 27 No. 1 (2026)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v27i1.16145

Abstract

This study explores the potential of nanoscale silicon carbide (SiC) particles synthesized from rice husk ash to enhance light absorption characteristics in solar panel applications. The SiC particles were produced by burning rice husks, followed by purification and division into two groups: one group underwent heat treatment at 400 °C, while the other was kept untreated for comparative analysis. High-Energy Milling (HEM) for 60 hours was used to reduce the particle size of selected samples. Comprehensive characterization was performed using Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and UV-Vis spectroscopy in the wavelength range of 200–1100 nm. The results of the study indicate that heat-treated SiC exhibits significantly reduced agglomeration and better particle dispersion compared to untreated samples. FTIR analysis confirmed the presence of additional functional groups (C=C and O–H) in the treated SiC, which contribute to surface chemical modification. Most importantly, the UV-Vis spectra show that the treated SiC maintains consistently higher absorbance values (0.5–0.6) in the visible to near-infrared region (400–1100 nm), whereas the untreated SiC exhibits a decreasing trend (0.4–0.2). These findings suggest that thermal processing can enhance the optical performance of SiC nanoparticles by improving dispersion and introducing functional groups that strengthen light-matter interactions. The superior absorption characteristics of the processed SiC demonstrate promising potential as an additive or nanostructured layer to improve photon capture and overall efficiency in photovoltaic devices
UJI EKSPERIMENTAL TORSI DAN DAYA MOTOR BLDC 48 V BERBASIS BATTERY PACK LiFePO₄ MENGGUNAKAN METODE PRONY BRAKE Ahmad Ilham Ramadhani; Dominicus Danardono Dwi Prija Tjahjana; Ngafwan Ngafwan
SINERGI POLMED: Jurnal Ilmiah Teknik Mesin Vol. 7 No. 2 (2026): Edisi Juni
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/sinergipolmed.v7i2.3228

Abstract

Nilai torsi dan daya menjadi faktor utama dalam menentukan karakteristik sistem penggerak Brushless Direct Current (BLDC) motor dengan suplai energi listrik dari baterai ion lithium (LiB). Tujuan penelitian ini adalah untuk menentukan torsi dan daya motor BLDC 48 V yang suplai oleh baterai lithium iron phosphate (LiFePO₄/LFP) menggunakan metode prony brake. Metode prony brake dilakukan dengan variasi beban W1 s.d. W5 dan variasi 200, 400, 600, 800, dan 1000 rpm. Pengujian eksperimental dirangkai menggunakan motor BLDC  dan LiB baterai pack LFP. Hasil eksperimen menunjukkan bahwa baterai pack yang digunakan berjenis LFP dengan kode rangkaian “15S12P”. Baterai pack LFP memiliki rentang tegangan 44,19 V - 55 V (charging) dan rentang tegangan 35,12 V - 53,12 V (discharging). Nilai torsi dan daya mengalami peningkatan seiring dengan penambahan rpm pada setiap variasi beban. Pada rentang operasi ini, sistem menunjukkan perubahan torsi dan daya yang lebih stabil. Nilai torsi tertinggi pada 1000 rpm (0,50 Nm; 0,55 Nm; 0,60 Nm; 0,63 Nm; 1,12 Nm) dan daya pada 1000 rpm (43,68 W; 46,77 W; 49,14 W; 50,68 W; dan 87,97 W). Informasi mengenai nilai torsi dan daya motor BLDC yang disuplai oleh baterai LFP, dapat menjadi salah satu acuan utama dalam mendukung pengembangan kendaraan rendah emisi.
Study of Liquid Organic Fertilizer Application with Empty Palm Oil Bunch Ash Nano on Soyabean (Glycine max L.) Gatot Supangkat Samidjo; Mulyono Mulyono; Bambang Isnawan; Henny Febriani; Ngafwan Ngafwan
Tropical Plantation Journal Vol 5, No 1 (2026): TROPICAL PLANTATION JOURNAL
Publisher : Akademi Komunitas Perkebunan Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56125/tpj.v5i1.85

Abstract

Proper fertilization is an effort to increase soybean production. This study aimed to examine the effect of Liquid Organic Fertilizer (LOF) application enriched with Empty Palm Oil Bunch (EPOB) Ash Nano  and determine the optimal concentration on soybean growth and yield. This research was carried out at the Experimental Field of the Faculty of Agriculture, Universitas Muhammadiyah Yogyakarta. This research was conducted using a single factor experimental method which was arranged in a Completely Randomized Design. The treatments tested were rabbit urine LOF; Rabbit urine LOF + EPOB Ash Nano 1%; Rabbit urine LOF + EPOB Ash Nano 2%; Rabbit urine LOF + EPOB Ash Nano 3% and rabbit urine LOF + EPOB Ash Nano 4%. The results showed that the application of  rabbit urine LOF + EPOB Ash Nano 4% could increase soybean growth and was able to increase the dry weight of 100 seeds. Application of rabbit urine LOF enriched with EPOB Ash Nano can save nitrogen nutrient fulfillment for soybeans by up to half the recommended dose. 
Co-Authors Abdul Munir Hidayat Syah Lubis Ahmad Ilham Ramadhani B. Kurniawan Bagas Kurniawan Balikowa, Amuza Bambang Heri Isnawan Danardono Dwi Prija Tjahjana, Dominicus Dewi, Sukuriyati Susilo Dody Bimo Aji Henny febriani Joharwan, Johanes Wawan Krisnoadi, Ridwan Kurniawan, Adhyaka Billy Laksono Trisnantoro M. Farid Wajdi M. Sholahuddin Marwan Effendy Marwan Effendy Masyrukan, M Mulyono Mulyono Mulyono Mulyono Nugroho, Taufik Surya Pramuko Ilmu Purboputro Purnama, Ari Riza, Ramzul Irham Rosy Hilal Mahendra Rosy Hilal Mahendra S Supriyono Sri Sunarjono Surono, Arif Syaiful Anwar Sani Taufik Surya Nugroho Tri Hartanto W. Setiyawan Wandera, Catherine