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Journal of Mechanical Engineering Learning
Published by Universitas Negeri Semarang
ISSN : 2252651X     EISSN : -     DOI : https://doi.org/10.15294/jmel
Core Subject : Engineering,
Mechanical Engineering
JMEL: Journal of Mechanical Engineering Learning published by the Mechanical Engineering Department, Faculty of Engineering, Universitas Negeri Semarang Indonesia, is a journal that contains scientific articles on mechanical engineering and mechanical engineering learning. Published articles in english by JMEL include the results of original scientific research findings and scientific review articles are new in mechanical engineering learning. JMEL publishes periodically six months.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 2 Documents
 1 
Search results for , issue "Vol. 14 No. 2 (2025): December (In Progress)" : 2 Documents clear
Development of interactive learning media using smart apps creator on electrical system of light vehicles in vocational high schools Al Farouqi, Sofyan; Hadromi; Widjanarko, Dwi
JMEL : Journal of Mechanical Engineering Learning Vol. 14 No. 2 (2025): December (In Progress)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v14.i2.31176

Abstract

This study aims to develop and evaluate the feasibility and effectiveness of interactive learning media based on Smart Apps Creator (SAC) for the topic of lighting and signaling systems in light vehicles, intended for Grade XI students of the Light Vehicle Engineering Program at SMK Negeri 2 Salatiga. The background of this research stems from low student achievement and the limited use of engaging instructional media at SMK N 2 Salatiga, which has resulted in students having difficulty understanding the electrical system material. This study employed a Research and Development (R&D) method using the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). The developed media underwent validation by subject matter experts and media experts, receiving "highly feasible" ratings with feasibility percentages of 90.25% from the media expert and 88% from the subject matter expert. The effectiveness was tested through pretest and posttest evaluations analyzed using the N-Gain test. The N-Gain score from 34 students yielded an average of 0.324, which falls into the "moderate" category. It can thus be concluded that the learning media based on Smart Apps Creator provided to students is moderately effective in improving their learning outcomes.
Performance Testing of a Multicylinder Diesel Engine Using Antioxidant Bio-Oil Additives from Moringa Oleifera Leaf Pyrolysis Juliyono, Jeri; Maulana, Sonika; Naryanto, Rizqi Fitri; Septiyanto, Angga
JMEL : Journal of Mechanical Engineering Learning Vol. 14 No. 2 (2025): December (In Progress)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v14.i2.32271

Abstract

Crude oil reserves are steadily depleting. One viable alternative is the use of biodiesel fuel in diesel engines. However, a major drawback of biodiesel is its susceptibility to degradation due to low oxidative stability. Antioxidants are compounds that inhibit or slow down the oxidation process by preventing the formation of oxidants or reducing the propagation of free radicals. This study aims to investigate the effect of adding antioxidant additives derived from Moringa oleifera bio-oil, produced through pyrolysis, to B30 biodiesel fuel at concentrations of 0, 500, 1000, and 1500 ppm on the performance of a multicylinder diesel engine. A quantitative approach was employed using an experimental method, and data analysis was conducted using descriptive analysis. The results showed that fuel consumption decreased with the addition of Moringa oleifera antioxidants, with reductions of 5.31%, 6.66%, and 7.08% at 500 ppm, 1000 ppm, and 1500 ppm, respectively, at an engine speed of 2500 rpm. The highest torque was achieved with 1000 ppm of Moringa oleifera antioxidant at 2728 rpm, reaching 111.9 Nm (an increase of 4.48%), while the highest power output was also obtained at 1000 ppm, reaching 70.9 HP at 5100 rpm (an increase of 3.2%).

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