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Azhar Syahputra
Universitas Malikussaleh
Automotive Engineering Control & Systems Engineering Education Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Other

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Effect of washing and torrefaction pretreatments on fuel properties of rice husk-based bio-pellets Alchalil Alchalil; Rizky Iskandar; Adi Setiawan; Zulmiardi Zulmiardi; Athiyah Rana; Azhar Syahputra
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.9120

Abstract

Rice husk is an abundant agricultural waste in Indonesia and has potential as a biomass fuel for co-firing in steam power plant boilers. This study investigated the effects of washing and torrefaction pretreatments on the fuel properties of rice husk-based bio-pellets to reduce ash content and improve calorific value. Rice husk was washed using water at 70 ± 5°C under two conditions, with stirring and without stirring, while untreated rice husk was used as a control. Torrefaction was conducted at 260°C, and the treated biomass was pelletized using tapioca starch as a binder at 30% of the raw material weight. The results showed that the lowest ash content (26.362%) was obtained from bio-pellets produced from rice husk washed without stirring, indicating that washing was effective in reducing ash content. The highest calorific value (4456.4 kcal/kg) was recorded in bio-pellets produced from untreated rice husk, while the highest combustion rate (0.504 g/min) was observed in the washed and torrefied samples. The findings indicate a trade-off between ash reduction and energy performance, depending on the pretreatment combination. However, all samples showed relatively high ash content (26%–36%), which may limit their direct suitability for co-firing without further ash reduction treatment.
PENGARUH MODEL PEMBELAJARAN GUIDED INQUIRY TERHADAP HASIL BELAJAR SISWA PADA MATERI PERAWATAN MESIN SEPEDA MOTOR DI SMK NEGERI 1 KLUET SELATAN : PENGARUH MODEL PEMBELAJARAN GUIDED INQUIRY TERHADAP HASIL BELAJAR SISWA PADA MATERI PERAWATAN MESIN SEPEDA MOTOR DI SMK NEGERI 1 KLUET SELATAN Sifaima Hasiholan; Abubakar Dabet; Azhar Syahputra; Jumadi; Riza Andriani; Islami Fatwa
Journal of Practice Learning and Educational Development Vol. 6 No. 1 (2026): Journal of Practice Learning and Educational Development (JPLED)
Publisher : Global Action and Education for Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58737/jpled.v6i1.872

Abstract

This study aims to determine the effect of the Guided Inquiry learning model on students' learning outcomes in motorcycle engine maintenance material at SMK Negeri 1 Kluet Selatan. This study uses a quantitative method with a quasi-experimental design in the form of a Nonequivalent Posttest-Only Control Group Design. The research sample consists of two classes, namely the experimental class using the guided inquiry model and the control class using the conventional method. The data collection instrument is in the form of a learning outcome test that has been tested for validity and reliability. Based on the results of the data analysis (t-test), the significance value of 0.000 < 0.05 indicates a difference in student learning outcomes on motorcycle engine maintenance material at SMK Negeri 1 Kluet Selatan between those using the Guided Inquiry learning model and those not using the Guided Inquiry model. The use of the Guided Inquiry learning model in the teaching process of motorcycle engine maintenance material, whether in individual or group learning, can provide more effective and efficient learning. Thus, the Guided Inquiry learning model has a positive effect on student learning outcomes in motorcycle engine maintenance material. This finding shows that the application of the appropriate learning model can improve the quality of education at SMK Negeri 1 Kluet Selatan.
Co-Authors Abubakar Dabet Adi Setiawan Alchalil Alchalil Athiyah Rana Islami Fatwa Jumadi Riza Andriani Rizky Iskandar Sifaima Hasiholan Zulmiardi, Zulmiardi