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All Journal Automotive Science and Education Journal Chemical Engineering Journal Storage (CEJS)
Zaka, Ahmad Murtadlo
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Education

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PENGEMBANGAN E-MODUL COMMON RAIL UNTUK MENINGKATKAN HASIL BELAJAR PADA KOMPETENSI PERAWATAN BAHAN BAKAR MESIN DIESEL DI SMK NEGERI JAWA TENGAH Zaka, Ahmad Murtadlo; Supraptono, Supraptono
Automotive Science and Education Journal Vol 9 No 1 (2020): Automotive Science and Education Journal
Publisher : Automotive Science and Education Journal

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Abstract

The purpose of this study is to develop an electronic module of common rail systems to contribute to learning outcomes, find out the feasibility, and effectiveness of students towards the use of common rail e-modules developed. The e-module development model uses ADDIE development. Based on the results of the product feasibility test, the final data percentage is 80.00% for media experts and 85.63% for material experts, so that the common rail e-module products meet the feasible and very feasible categories. E-modules contribute to student learning outcomes seen from the difference in the average value of the pretest-posttest by 16.06. The t-test shows the value of tcount= 8.91> ttable= 2.080. The contribution of student learning outcomes is obtained by the average N-Gain test of 0.5622 with the criteria for the contribution of student learning outcomes to being. Analysis of student effectiveness obtained a percentage of 91.86% included in the excellent category
PENGEMBANGAN E-MODUL COMMON RAIL UNTUK MENINGKATKAN HASIL BELAJAR PADA KOMPETENSI PERAWATAN BAHAN BAKAR MESIN DIESEL DI SMK NEGERI JAWA TENGAH Zaka, Ahmad Murtadlo; Supraptono, Supraptono
Automotive Science and Education Journal Vol 9 No 1 (2020): Automotive Science and Education Journal
Publisher : Automotive Science and Education Journal

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

Abstract

The purpose of this study is to develop an electronic module of common rail systems to contribute to learning outcomes, find out the feasibility, and effectiveness of students towards the use of common rail e-modules developed. The e-module development model uses ADDIE development. Based on the results of the product feasibility test, the final data percentage is 80.00% for media experts and 85.63% for material experts, so that the common rail e-module products meet the feasible and very feasible categories. E-modules contribute to student learning outcomes seen from the difference in the average value of the pretest-posttest by 16.06. The t-test shows the value of tcount= 8.91> ttable= 2.080. The contribution of student learning outcomes is obtained by the average N-Gain test of 0.5622 with the criteria for the contribution of student learning outcomes to being. Analysis of student effectiveness obtained a percentage of 91.86% included in the excellent category
Microwave-Assisted Pyrolysis of Rice Husk Waste Using Silicon Carbide: Effects of Particle Size and Holding Time Zaka, Ahmad Murtadlo; Saptoadi, Harwin; Putra, Robertus Dhimas Dhewangga
Chemical Engineering Journal Storage (CEJS) Vol. 5 No. 2 (2025): Chemical Engineering Journal Storage (CEJS)-Mei 2025
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/cejs.v5i2.21615

Abstract

Microwave pyrolysis converts rice husk waste into biochar, bio-oil, and gas products. This research utilized a microwave oven and a conventional oven to process rice husk into pyrolysis products, with silicon carbide (SiC) serving as an absorber in the primary microwave reactor and a natural zeolite catalyst in the secondary oven reactor. The particle size variations of rice husk waste were 2-1 mm, 1-0.5 mm, and 0.5-0.25 mm, with holding times of 5, 10, 15, and 20 minutes. The smallest particle size (0.25-0.5 mm) exhibited the fastest and most consistent heating rate, reaching 400 ËšC in 900 seconds and 450 ËšC in 1268 seconds. The highest biochar yield was obtained at a 5-minute holding time, whereas the highest bio-oil yield was achieved at 20 minutes. The highest gas yields for 1-2 mm (17.80%) and 0.5-1 mm (17.90%) were achieved at 5 minutes of holding time, whereas 0.25-0.5 mm particles yielded the highest gas (21.60%) at 20 minutes. The highest total energy of 1.153 MJ was obtained at size 1-2 with a holding time of 10 minutes and size 0.5-1 mm with a holding time of 5 minutes, while 0.25-0.5 mm particles reached 1.122 MJ at 10 minutes. The highest energy efficiency was achieved at a holding time of 5 minutes, recorded at 21.44% for particles sized 0.25-0.5 mm. This value is higher compared to particles sized 0.5-1 mm (21.21%) and 1-2 mm (19.84%). These results contribute to the optimization of rice husk waste management and the sustainable utilization of biomass
Co-Authors Harwin Saptoadi Putra, Robertus Dhimas Dhewangga Supraptono Supraptono, Supraptono