Vol. 57 No. 6 (2025): Vol. 57 No. 6 (2025): December

DOI: https://doi.org/10.5614/j.eng.technol.sci.2025.57.6
Published: 2025-10-28

Articles

  • The Effect of Ignition Timing on Combustion of Ammonia/Ethanol Mixtures in Spark-Assisted Compression Ignition Engine with a Sub-chamber

    DOI : 10.5614/j.eng.technol.sci.2025.57.6.1
    Takanobu Okada (1), Mitsuhisa Ichiyanagi (2), Emir Yilmaz (3), Takashi Suzuki (4), Hikaru Shiraishi (5), Eric Le Roy Ngwompe Souop (6), Evan Widjaja (7), Jason Sutedjo (8), Christian Dennis Marcelo (9), Ferdinand Ronaldo Tjiotijono (10), Gabriel Jeremy Gotama (11), Willyanto Anggono (12)
    (1) Postgraduate School of Science and Technology, Sophia University, Tokyo 102-8554, Japan ,
    (2) Department of Engineering and Applied Sciences, Faculty of Science and Technology, Sophia University, Tokyo 102-8554, , Japan ,
    (3) Department of Engineering and Applied Sciences, Faculty of Science and Technology, Sophia University, Tokyo 102-8554, , Japan ,
    (4) Department of Engineering and Applied Sciences, Faculty of Science and Technology, Sophia University, Tokyo 102-8554, , Japan ,
    (5) Department of Engineering and Applied Sciences, Faculty of Science and Technology, Sophia University, Tokyo 102-8554, , Japan ,
    (6) Graduate School of Science and Technology, Sophia University, Tokyo 102-8554, Japan ,
    (7) Mechanical Engineering Department, Petra Christian University, Surabaya 60236, Indonesia ,
    (8) Mechanical Engineering Department, Petra Christian University, Surabaya 60236, Indonesia ,
    (9) Mechanical Engineering Department, Petra Christian University, Surabaya 60236, Indonesia ,
    (10) Graduate School of Science and Technology, Sophia University, Tokyo 102-8554, Japan ,
    (11) Centre for Sustainable Energy Studies, Petra Christian University, Surabaya 60236, , Indonesia ,
    (12) Mechanical Engineering Department, Petra Christian University, Surabaya 60236, Indonesia
    735-746
    Abstract : 1599
    PDF : 1308
    DOI: https://doi.org/10.5614/j.eng.technol.sci.2025.57.6.1

  • Developing Carbon Nanofibers from Gnetum Gnemon Linn Pericarp Using Dual Activators KOH And Melamine as Innovative Electrode Materials for Supercapacitors

    DOI : 10.5614/j.eng.technol.sci.2025.57.6.2
    Rakhmawati Farma (1), Hardini Chania Putri (2), Irma Apriyani (3), Luqyana Adha Azwat (4), Awitdrus Awitdrus (5), Mohamad Deraman (6), Ari Sulistyo Rini (7), Rahmondia Nanda Setiadi (8), Erman Taer (9)
    (1) Department of Physics, University of Riau, Kampus Bina Widya, Km. 12,5 Simpang Baru Pekanbaru, 28293, Riau, Indonesia ,
    (2) Department of Physics, University of Riau, Kampus Bina Widya, Km. 12,5 Simpang Baru Pekanbaru, 28293, Riau, Indonesia ,
    (3) Department of Physics, University of Riau, Kampus Bina Widya, Km. 12,5 Simpang Baru Pekanbaru, 28293, Riau, Indonesia ,
    (4) Department of Physics, Universitas Indonesia, Kampus UI Depok, Margonda Raya, Kampus Baru, Depok 16424, Indonesia ,
    (5) Department of Physics, University of Riau, Kampus Bina Widya, Km. 12,5 Simpang Baru Pekanbaru, 28293, Riau, Indonesia ,
    (6) School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, , Malaysia ,
    (7) Department of Physics, University of Riau, Kampus Bina Widya, Km. 12,5 Simpang Baru Pekanbaru, 28293, Riau, Indonesia ,
    (8) Department of Physics, University of Riau, Kampus Bina Widya, Km. 12,5 Simpang Baru Pekanbaru, 28293, Riau, Indonesia ,
    (9) Department of Physics, University of Riau, Kampus Bina Widya, Km. 12,5 Simpang Baru Pekanbaru, 28293, Riau, , Indonesia
    747-759
    Abstract : 1080
    PDF : 518
    DOI: https://doi.org/10.5614/j.eng.technol.sci.2025.57.6.2

  • Crashworthy Structure Analysis of Indonesia's First High-speed Train Trailer Made from Aluminum Extrusion

    DOI : 10.5614/j.eng.technol.sci.2025.57.6.3
    Achmad Syaifudin (1), Khakim Muh Luqman (2)
    (1) Laboratory of Solid Mechanics, Department of Mechanical Engineering, Institut Teknologi Sepuluh Nopember (ITS), Jalan Teknik Industri, Keputih, Kec. Sukolilo, Surabaya, Jawa Timur 60111, , Indonesia ,
    (2) Departement of Engineering Solution, PT Sanggar Sarana Baja, Jalan Cilandak KKO No. 1 Jakarta 12560, Indonesia
    760-775
    Abstract : 1042
    PDF : 704
    DOI: https://doi.org/10.5614/j.eng.technol.sci.2025.57.6.3

  • Influences of Groove Geometries on Bend Radius and Springback in V-Bending

    DOI : 10.5614/j.eng.technol.sci.2025.57.6.4
    Quoc-Nguyen Banh (1), Viet-Khai Le (2), Anh-Chuong Le (3), Anh-Son Tran (4), Minh-Tuan Ho (5)
    (1) Department of Manufacturing Engineering, Faculty of Mechanical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, Dien Hong Ward, Ho Chi Minh City, , Viet Nam ,
    (2) Department of Manufacturing Engineering, Faculty of Mechanical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, Dien Hong Ward, Ho Chi Minh City, , Viet Nam ,
    (3) Department of Manufacturing Engineering, Faculty of Mechanical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, Dien Hong Ward, Ho Chi Minh City, , Viet Nam ,
    (4) Department of Manufacturing Engineering, Faculty of Mechanical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, Dien Hong Ward, Ho Chi Minh City, , Viet Nam ,
    (5) Department of Manufacturing Engineering, Faculty of Mechanical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, Dien Hong Ward, Ho Chi Minh City, , Viet Nam
    776-790
    Abstract : 1040
    PDF : 483
    DOI: https://doi.org/10.5614/j.eng.technol.sci.2025.57.6.4

  • Multi-criteria Decision Making to Improve Displacement Amplification Ratio of an Amplifying Compliant Mechanism Flexure Hinge

    DOI : 10.5614/j.eng.technol.sci.2025.57.6.5
    Ngoc Thai Huynh (1), Van Nam Huynh (2), Quoc Nhiem Tran (3), Chi Bao Phan (4), Minh Hung Vu (5), Trieu Khoa Nguyen (6), Quoc Manh Nguyen (7)
    (1) Faculty of Mechanical Engineering and Technology, Ho Chi Minh City University of Industry and Trade, 140 Le Trong Tan, Tay Thanh Ward, Ho Chi Minh City 700000, , Viet Nam ,
    (2) Faculty of Mechanical Engineering and Technology, Ho Chi Minh City University of Industry and Trade, 140 Le Trong Tan, Tay Thanh Ward, Ho Chi Minh City 700000, , Viet Nam ,
    (3) Faculty of Mechanical Engineering and Technology, Ho Chi Minh City University of Industry and Trade, 140 Le Trong Tan, Tay Thanh Ward, Ho Chi Minh City 700000, , Viet Nam ,
    (4) Faculty of Mechanical Engineering and Technology, Ho Chi Minh City University of Industry and Trade, 140 Le Trong Tan, Tay Thanh Ward, Ho Chi Minh City 700000, , Viet Nam ,
    (5) Faculty of Fundamental Sciences, PetroVietnam University, Ho Chi Minh City 700000, , Viet Nam ,
    (6) Faculty of Mechanical Engineering, Industrial University of Ho Chi Minh City, 12 Nguyen Van Bao Street, Hanh Thong Ward, Ho Chi Minh City 700000, Viet Nam ,
    (7) Faculty of Mechanical Engineering, Hung Yen University of Technology and Education, Hung Yen 160000, , Viet Nam
    791-816
    Abstract : 1042
    PDF : 348
    DOI: https://doi.org/10.5614/j.eng.technol.sci.2025.57.6.5

  • Classifying Rockburst Events and Intensity in Underground Mines using Grey Wolf Optimization–Support Vector Machine and Extreme Gradient Boosting

    DOI : 10.5614/j.eng.technol.sci.2025.57.6.6
    Adhitya Dwi Nugraha (1), Ridho Kresna Wattimena (2), Bevina Desjwiandra Handari (3), Gatot Hertono (4)
    (1) Department of Mathematics, Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Indonesia, Kampus Baru UI, Depok 16424, Indonesia ,
    (2) Department of Mining Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa 10 Bandung 40132, Indonesia ,
    (3) Department of Mathematics, Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Indonesia, Kampus Baru UI, Depok 16424, Indonesia ,
    (4) Department of Mathematics, Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Indonesia, Kampus Baru UI, Depok 16424, Indonesia
    817-830
    Abstract : 705
    PDF : 381
    DOI: https://doi.org/10.5614/j.eng.technol.sci.2025.57.6.6

  • Electrochemiluminescence sensor based on GDYO-QD@M-ZnO and its application in the detection of free radicals and antioxidants

    DOI : 10.5614/j.eng.technol.sci.2025.57.6.7
    Gang Tian (1), Cong Yang (2), Yihang Tian (3), Zihuan Wang (4), Yannan Dang (5)
    (1) School of Chemical and Environmental Engineering, Pingdingshan University, Pingdingshan, 467000, China, China ,
    (2) School of Chemical and Environmental Engineering, Pingdingshan University, Pingdingshan, 467000, China, China ,
    (3) School of Chemical and Environmental Engineering, Pingdingshan University, Pingdingshan, 467000, China, China ,
    (4) School of Chemical and Environmental Engineering, Pingdingshan University, Pingdingshan, 467000, China, China ,
    (5) School of Chemical and Environmental Engineering, Pingdingshan University, Pingdingshan, 467000, China, China
    831-843
    Abstract : 586
    PDF : 255
    DOI: https://doi.org/10.5614/j.eng.technol.sci.2025.57.6.7

  • Sustainable thermal insulation of geopolymer blocks using solid waste: palm oil ash and palm oil clinker

    DOI : 10.5614/j.eng.technol.sci.2025.57.6.8
    Abideng Hawa (1), Preecha Salaemae (2)
    (1) Department of Civil Engineering, Faculty of Engineering, Princess of Naradhiwas University, Thailand ,
    (2) , Thailand
    844-858
    Abstract : 630
    PDF : 740
    DOI: https://doi.org/10.5614/j.eng.technol.sci.2025.57.6.8

  • The Initial Development of Integrated Add-On Tele-Ultrasonography for Monitoring the Health of Pregnant Women and Fetuses in the Community Health Centers in Indonesia -

    DOI : 10.5614/j.eng.technol.sci.2025.57.6.9
    Hesty Susanti (1), Suto Setiyadi (2), Dita Puspitasari (3), Fenty Alia (4), Muhammad Rizqi Syah Ramadhan (5)
    (1) Biomedical Engineering Study Program, School of Electrical Engineering, Telkom University Main Campus, Jalan Telekomunikasi No. 1, Bandung 40257, West Java, , Indonesia ,
    (2) Electrical Engineering Study Program, School of Electrical Engineering, Telkom University Main Campus, Jalan Telekomunikasi No. 1, Bandung 40257, West Java, Indonesia ,
    (3) Center of Excellence of Biomedical and Healthcare Technology, Research Institute of Sustainable Society, Telkom University Main Campus, Jalan Telekomunikasi No. 1, Bandung 40257, West Java, , Indonesia ,
    (4) Center of Excellence of Biomedical and Healthcare Technology, Research Institute of Sustainable Society, Telkom University Main Campus, Jalan Telekomunikasi No. 1, Bandung 40257, West Java, , Indonesia ,
    (5) Master of Electrical Engineering Study Program, School of Electrical Engineering, Telkom University Main Campus, Jalan Telekomunikasi No. 1, Bandung 40257, West Java, , Indonesia
    859-874
    Abstract : 1055
    PDF : 464
    DOI: https://doi.org/10.5614/j.eng.technol.sci.2025.57.6.9

  • Sensitive Detection of Rhodamine B Using Surface Enhanced Raman Spectroscopy with a BiFeO3 based Substrate

    DOI : 10.5614/j.eng.technol.sci.2025.57.6.10
    Diva Cassia Mayora (1), Djoko Triyono (2), Muhandis Shiddiq (3), Rifqi Almusawi Rafsanjani (4), Akhmad Futukhillah Fataba Alaih (5)
    (1) , Indonesia ,
    (2) Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Indonesia, Lingkar Street, Depok, West Java, 16424, Indonesia ,
    (3) Research Center for Photonics, National Research and Innovation Agency (BRIN), Raya Puspiptek Street, Puspiptek, Tangerang Selatan, Banten, 15314, , Indonesia ,
    (4) Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Indonesia, Lingkar Street, Depok, West Java, 16424, Indonesia ,
    (5) Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Indonesia, Lingkar Street, Depok, West Java, 16424, , Indonesia
    875-884
    Abstract : 798
    PDF : 703
    DOI: https://doi.org/10.5614/j.eng.technol.sci.2025.57.6.10