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All Journal SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Scientific Journal of Mechanical Engineering Kinematika Journal of Fibers and Polymer Composites
Suteja Suteja
University of Mataram
Agriculture, Biological Sciences & Forestry Automotive Engineering Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences Other

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Pineapple Leaf Fiber Reinforced Polyester Composite Modified with Particles from Horse Dung Waste: Characterization of Mechanical Properties and Morphology Nasmi Herlinasari; Suteja Suteja
Journal of Fibers and Polymer Composites Vol. 1 No. 1 (2022): Journal of Fibers and Polymer Composites
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (969.538 KB) | DOI: 10.55043/jfpc.v1i1.38

Abstract

Abstract. The modification of the characteristics of natural fiber composites with components derived from abundant and environmentally beneficial horse dung waste has piqued interest. The purpose of this investigation was to see how adding horse dung particles (DN) to pineapple leaf fiber (DN)/polyester composites affected the results. To create new samples, different percentages of HF (5–30%) are utilized. Hand-layup method was used to create the DN/HF composite. The results revealed that adding 30% (vol. percent) HF to the composite improved elongation, flexural strength, and flexural modulus, while adding 5% (vol. percent) HF improved impact strength, tensile strength, and tensile modulus of elasticity. At 30% HF concentration, maximum flexural strength values of 63.91 5.1 MPa were recorded. The composite's fracture morphology revealed weak interfacial interactions between DN-polyester-HF, and particle accumulation.
Influence of Pumice Particles on the Mechanical and Morphology Properties of Polyester-Cornhusk Fiber Composites Nasmi Herlina Sari; Suteja Suteja; I Putu Lokantara; Topan Gusti Wibowo
Journal of Fibers and Polymer Composites Vol. 1 No. 2 (2022): Journal of Fibers and Polymer Composites
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (724.561 KB) | DOI: 10.55043/jfpc.v1i2.54

Abstract

The purpose of this study was to look into the performance of a cornhusk fiber (CHF) reinforced polyester composite with pumice powder (PP) as a filler. The influence of varied PP volume fractions on composite tensile, bending, impact, and fracture morphology was studied. Using the hot press process, polyester-CHF composites with varied volume fractions of PP filler, namely 5%, 10%, 15%, 20%, 25%, and 30% wt, were created. The results showed that increasing the PP volume fraction from 5% to 15% enhanced the tensile strength of the polyester-CHF composite. The modulus of elasticity and bending modulus tend to grow when filler Pp decreases from 5% to 30%, but elongation value decreases. Furthermore, the best bending strength and impact toughness of the polyester-CHF composite were produced at a volume fraction of PP filler of 20%. SEM images indicate the presence of CHF pull out in all composite variations as well as the number of voids dependent on the PP filler volume.
The Mechanical Properties of a Water Hyacinth/Rice Husk Powders Composite for Tissue Engineering Applications Nasmi Herlina Sari; Suteja Suteja; Yusuf Akhyar Sutaryono
Journal of Fibers and Polymer Composites Vol. 2 No. 2 (2023): Journal of Fibers and Polymer Composites
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jfpc.v2i2.123

Abstract

In this study, composites made from water hyacinth powder (WPH) and rice husk powder (RH) were created using the hot press method, and the composites were characterized to determine their suitability for biomedical applications such as tissue engineering. The mixing ratio of WPH/RH was investigated. Fourier transmission infrared spectroscopy (FTIR) revealed the presence of chemical bonds in the composites under investigation. Tensile tests were used to investigate the mechanical properties of the composite, which revealed that adding water WPH to the rice husk composite reduced the composite's strength. A composite with a 5% WPH content had the highest tensile strength of 32.72 MPa. Meanwhile, the mechanical strength of the other composites studied ranged from 25,537 MPa to 29.43 MPa. However, the elastic modulus of the composite increased with the addition of WPH. The SEM image shows that the powder distribution is less even, the interface between WPH-RH and polyester is quite tight, and the composite contains a number of voids. Characterization of the developed composite demonstrates that the WPH/RH addition ratio can be adjusted to achieve the desired composite properties for tissue engineering and cartilage regeneration applications.
Peningkatan produktivitas kerja di usaha kecil pada Dusun Ambung, Desa Masbagik Timur, Kecamatan Masbagik, Kabupaten Lombok Timur Syarif Hidayatullah; Syahrul Syahrul; I Dewa Ketut Okariawan; Salman Salman; Agus Dwi Catur; Suteja Suteja; Ahmad Akromul Huda
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 10, No 3 (2026): June (In Progress)
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v%vi%i.39007

Abstract

AbstrakUsaha kecil di Dusun Ambung, Desa Masbagik Timur, masih menghadapi kendala efisiensi produksi akibat penggunaan alat tradisional dalam pengolahan keripik singkong. Proses pemotongan singkong secara manual membutuhkan waktu lama, menghasilkan irisan yang kurang seragam, dan meningkatkan risiko cedera kerja. Kegiatan pengabdian ini bertujuan meningkatkan produktivitas kerja mitra melalui penerapan alat pemotong singkong berbasis teknologi tepat guna. Metode kegiatan meliputi observasi lapangan, persiapan dan perakitan alat, sosialisasi penggunaan alat, edukasi manfaat teknologi, serta serah terima alat kepada mitra usaha kecil. Seluruh tahapan dilakukan secara partisipatif agar mitra dapat memahami, menggunakan, dan merawat alat secara berkelanjutan. Hasil kegiatan menunjukkan bahwa penggunaan alat pemotong singkong meningkatkan kapasitas pemotongan dari 8–10 kg/jam pada metode manual menjadi 22–26 kg/jam setelah alat digunakan, atau sekitar 2,4–2,8 kali lebih tinggi. Waktu pemotongan untuk 10 kg singkong juga berkurang dari sekitar 60–75 menit menjadi 23–27 menit. Selain itu, hasil irisan menjadi lebih seragam, kebutuhan tenaga kerja berkurang, dan risiko cedera saat produksi dapat diminimalkan. Program ini menunjukkan bahwa inovasi sederhana berbasis teknologi tepat guna dapat meningkatkan efisiensi, produktivitas, dan daya saing usaha kecil pengolahan singkong. Kata kunci: usaha kecil; alat pemotong singkong; teknologi tepat guna; produktivitas; Dusun Ambung. AbstractSmall businesses in Ambung Hamlet, Masbagik Timur Village, still face production efficiency challenges due to the use of traditional tools in cassava chip processing. The manual cassava cutting process is time-consuming, produces uneven slices, and increases the risk of workplace injuries. This community service activity aims to improve the productivity of small business partners through the implementation of cassava-cutting tools based on appropriate technology. The activity methods include field observations, tool preparation and assembly, training on tool usage, education on the benefits of the technology, and the handover of tools to small business partners. All stages were conducted in a participatory manner so that partners could understand, use, and maintain the tools sustainably. The results of the activity show that the use of the cassava cutting tool increased cutting capacity from 8–10 kg/hour using manual methods to 22–26 kg/hour after the tool was used, or approximately 2.4–2.8 times higher. The cutting time for 10 kg of cassava also decreased from about 60–75 minutes to 23–27 minutes. In addition, the slices became more uniform, labor requirements were reduced, and the risk of injury during production was minimized. This program demonstrates that simple innovations based on appropriate technology can improve the efficiency, productivity, and competitiveness of small cassava processing businesses. Keywords: small business; cassava cutting tool; appropriate technology; productivity; Ambung Hamlet.
MOLECULAR ADSORPTION OF ZEA MAYS LEAF PHYTOCHEMICALS ON Fe(110) AS CORROSION INHIBITORS: DFT AND MONTE CARLO STUDY Syarif Hidayatullah; Suteja Suteja
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Plant-derived compounds have attracted increasing attention as environmentally friendly corrosion inhibitor candidates. However, the molecular adsorption behavior of selected phytochemicals from Zea mays leaves on iron surfaces remains insufficiently understood. This study investigates ethyl palmitate (EP), hexadecanoic acid (HA), and 9,12,15-octadecatrienoic acid (OA), identified from Zea mays leaf extract, as potential inhibitors for the Fe(110) surface. Density Functional Theory (DFT) calculations at the B3LYP/6–311G(d,p) level were used to evaluate global and local electronic descriptors, including frontier molecular orbital energies, energy gap, dipole moment, hardness, softness, electronegativity, electron transfer tendency, Mulliken charge distribution, electrostatic potential, and Fukui indices. Monte Carlo simulations were performed to examine the adsorption behavior of these molecules on Fe(110) in the presence of water molecules. The DFT results showed that OA had the smallest energy gap and the highest softness, indicating the strongest electronic reactivity among the studied molecules. In contrast, EP exhibited the strongest adsorption affinity in the Monte Carlo simulation. The calculated differential adsorption energies for EP, OA, and HA were −203.32, −192.71, and −189.69 kcal/mol, respectively, indicating favorable adsorption on Fe(110). Oxygen-containing functional groups were identified as the main reactive sites involved in molecule–surface interactions. The main contribution of this work is the molecular-level comparison of selected Zea mays leaf phytochemicals on Fe(110) using combined DFT and Monte Carlo approaches. The results suggest that EP and OA are promising green corrosion inhibitor candidates, although experimental validation is required to confirm their inhibition efficiency under practical corrosive conditions.
Co-Authors Agus Dwi Catur Ahmad Akromul Huda I Dewa Ketut Okariawan Nasmi Herlina Sari Nasmi Herlinasari Putu Lokantara Salman Salman Syahrul Syahrul Syarif Hidayatullah Topan Gusti Wibowo Yusuf Akhyar Sutaryono