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All Journal JURNAL PIJAR Jurnal Penelitian Pendidikan IPA (JPPIPA) ORBITA: Jurnal Pendidikan dan Ilmu Fisika Paedagoria : Jurnal Kajian, Penelitian dan Pengembangan Kependidikan Jurnal Pengabdian Magister Pendidikan IPA Jurnal Pendidikan Fisika dan Teknologi Jurnal Analis Medika Biosains (JAMBS) Kasuari: Physics Education Journal (KPEJ) Kappa Journal Jurnal Pengabdian Masyarakat Sains Indonesia (Indonesian Journal Of Science Community Services) Jurnal Ilmiah Profesi Pendidikan Journal of Classroom Action Research Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Hydrogen: Jurnal Kependidikan Kimia International Journal of Engineering, Science and Information Technology These proceedings represent the work of researchers participating in The International Conference on Elementary Education (ICEE) which is being hosted by the Elementary Education Study Programme School of Postgraduate Studies, Universitas Pendidikan Unram Journal of Community Service (UJCS) Journal of Science and Science Education (JoSSEd) Jurnal Penelitian dan Pembelajaran Fisika Indonesia Lensa: Jurnal Kependidikan Fisika Lambda: Jurnal Ilmiah Pendidikan MIPA dan Aplikasinya Jurnal Pendidikan Sains Indonesia (Indonesian Journal of Science Education) International Journal of Essential Competencies in Education JIPI (Jurnal IPA dan Pembelajaran IPA) AMPLITUDO: Journal of Science & Technology Innovation MANDALIKA: Journal of Social Sciences International Journal of Science Education and Science Jurnal Wicara Desa ESENSI: Jurnal Riset Pendidikan Current Educational Review Journal of Material Science and Radiation Indonesian Journal of STEM Education International Journal of Contextual Science Education
Aris Doyan
Universitas Mataram
Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Neuroscience Physics Public Health Social Sciences Transportation Other

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Journal : AMPLITUDO: Journal of Science

 1   2 
Influence of Carbon Nanotubes in Improving the Superconducting and Structural Properties of Bulk Bi-2212 Synthesis by Thermal Treatment Method Sukor, Safia Izzati Abd; Kechik, Mohd Mustafa Awang; Kamarudin, Aliah Nursyahirah; Shaari, Abdul Halim; Kien, Chen Soo; Pah, Lim Kean; Shariff, Khairul Khaizi Mohd; Shabdin, Muhammad Kashfi; Yaakob, Yazid; Karim, Muhammad Khalis Abdul; Doyan, Aris
AMPLITUDO : Journal of Science and Technology Innovation Vol. 3 No. 2 (2024): August
Publisher : Balai Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56566/amplitudo.v3i2.224

Abstract

Bi-2212 superconductor has garnered significant interest in recent years due to its potential applications in the development of superconducting wires and tapes. The effect of introducing carbon nanotubes (CNT) into the Bi-2212 system was investigated in terms of superconducting and structural properties. The results of this study indicated that the addition of CNTs had a notable effect on the phase formation of Bi-2212,  with a substantial increase from 86.8% to 97.4% for the sample with a weight percentage of 0.8 wt.%.  This can be attributed to the improved particle orientation brought about by the introduction of CNTs.  The microstructure analysis displayed randomly distributed grains of irregular shapes, with a reduced average grain size of 1.018 μm upon the addition of 0.4 wt.% CNTs. Additionally, the inclusion of CNTs led to an increase in the Tc value, with the maximum Tc-onset recorded at 79 K for the sample containing 0.6 wt.% CNTs.  In summary CNT has enhanced the structural  and the superconducting properties of the Bi-2212 synthesised with thermal treatment method.
A Hybrid Ensemble Framework for Probabilistic Earthquake Forecasting in Northern California in Support of SDG 11: Sustainable and Resilient Cities Madlazim, Madlazim; Musta, Baba; Doyan, Aris; Susilo, Adi; Rehman, Khaista
AMPLITUDO : Journal of Science and Technology Innovation Vol. 5 No. 1 (2026): February
Publisher : Balai Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56566/amplitudo.v5i1.496

Abstract

Forecasting earthquakes is still one of the most difficult problems in geophysics, mainly because seismic activity is irregular and often influenced by many factors that interact in complex ways. In this study, we develop a leakage-controlled hybrid ensemble model that combines CatBoost, LightGBM, XGBoost, and Gradient Boosting to predict five earthquake parameters: magnitude, depth, latitude, longitude, and a scaled inter-event interval in Northern California. These models were trained using USGS earthquake data ranging from 1900 to 2025 (M ≥ 4.0), with a process designed to prevent time leakage through strict time separation, a moving window feature, and prospective validation. Overall, the hybrid models produced consistently low MAE and RMSE values ​​and very high R² values ​​(above 0.99) for all target variables. While the estimates performed impressively, the results should be interpreted in a probabilistic context, with recognition of the inherent uncertainty of seismic processes. The framework proposed here provides a clear and replicable approach that can support the development of systems for more reliable short-term earthquake forecasting
A Comparative Study of Gadobutrol Relaxivity at 3 Tesla for Sustainable Contrast Management and Standardized Phantom Calibration Ha’, Maheran Che; Kamal, Izdihar; Kechik, Mohd Mustafa Awang; Sayuti, Khairil Amir; Mohammed, Yusri; Karim, Muhammad Khalis Abdul; Doyan, Aris
AMPLITUDO : Journal of Science and Technology Innovation Vol. 5 No. 1 (2026): February
Publisher : Balai Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56566/amplitudo.v5i1.527

Abstract

This study aimed to characterize the relaxivity profiles of pure agarose and gadobutrol in 1% (w/v) agarose under two experimental conditions (within the air and tap-water immersion). T1 and T2 values were quantified at 3 Tesla, Siemens, Vida scanner using inversion recovery turbo spin echo (IR-TSE) for T1 and multi-echo turbo spin echo (ME-TSE) for T2. Different concentration of agarose (0.2 – 4.0% w/v) and gadobutrol (0.5 – 6.0 mM) and their T1 and T2 value for each concentration were measured. Pure agarose demonstrated low longitudinal relaxivity (r1 » 0.04 - 0.05 s-1.(%w/v)-1 vs. r1 » 2.97 - 3.52 s-1mM-1) and high transverse relaxivity (r2 » 5.00 - 6.34 s-1.(%w/v)-1 vs. r2 » 3.80 - 4.55 s-1mM-1) compared to gadobutrol. Agarose showed a very high r2/r1 ratio (129.4-160.0) than gadobutrol (1.28-1.29), reflecting stronger gel-matrix effects on transverse dephasing than on longitudinal recovery. Tap-water immersion had shortened T1 by »9% relative to air, without significantly increasing variability. These findings provide relaxivity values for agarose and gadobutrol under well-defined conditions and illustrate how their complementary relaxation behavior can tune T1 and T2 values over a wide range to create customizable MRI calibration phantom for research and clinical use
Co-Authors 'Ardhuha, Jannatin 'Ardhuha, Jannatin A, Syahrial A. Wahab Jufri A.A. Ketut Agung Cahyawan W AA Sudharmawan, AA AA Sukarso Abadi, Muhammad Abdul Syukur Abdullah, Eka Nur Wulandari Abelia Berliana Casandra Adi Susilo Adisan, Adisan Afandi, Samsul Agus Abhi Purwoko Agus Ramdani Agus Ramdani Ahadusifa, Sarairina Ahmad Busyairi, Ahmad Ahmad Harjono Ahzan, Sukainil Al Fiyatoen Sevtia Al-Qoyyim, Thufail Mujaddid Alfido Fauzy Zakaria Alrizal, Fahmi Firdaus Amanah, Prelia Dwi Anak Agung Ayu Niti Wedayani Anak Agung Istri Dhika Dharma Putri Anjani, Aprilia Ika Dewi Annisa Annisa Apriani, Ni Wayan Riska Ardianti, Nuraini Rachma Ayu Listari Azzumar Wirahadi ‘Ardhuha, Jannatin Bahtiar Bahtiar Baiq Nabila Saufika Zainuri Bakhtiar Ardiansyah Baqiah, Hussien Bilad, Muhammad Roil Cahyani, Novia Intan Chen, Soo Kien Daeng, Ade Claudia Asnan Dedi Riyan Rizaldi Deswita Devi, Via Monica Deyan Syahirah Khairunnisa Er, Tai Pao Faizin, Ruhil Faresta, Rangga Alif Fatimah, Ziadatul Fitriani, Siti Rahayu G. Gunawan, G. Gito Hadiprayitno Gummah, Sifaul Gummah, Syifaul Gunawan Gunawan Gunawan Gunawan Gunawan Haeratunisah Hakim, Aliefmam Hakim, Syamsul Hamidi Hamidi Hamidi Hamidi Handayani, Yayuk Handrianto, Handrianto Hapipi, Nurhidayah Mohd Haris Munandar Harpani, Baiq Fara Audy Harry Soeprianto Hartati, Fitriana Yuni Hasnaini, Yulina Ha’, Maheran Che Herdina, Awidya Hidayatul Aini Hikmawati Hikmawati Hikmawati Hikmawati Hikmawati Hikmawati Hikmawati*, Hikmawati husnul fuadi, husnul Hutabarat, Risnawati Agustin I Ketut Mahardika I Wayan Gunada I Wayan Gunada Ibrahim Ibrahim Ilham Halik, Ilham Infarlina, Baiq Hurun Iqlima, Sheiliana Ira Galih Isni Sahrianti Izzatun Nidda Jahria Jahria JANNATIN ARDHUHA, JANNATIN Jaswadi Joni Rokhmat Joni Rokhmat Kamal, Izdihar Kamarudin, Aliah Nursyahirah Karim, Muhammad Khalis Abdul Kartini Kartini Kechik, Mohd Mustafa Awang Khaerus Syahidi Kien, Chen Soo Kosim Kosim . Kosim Kosim Kouamé, Alfred Niamien Kouamé, Alfred Niamien Kusumayati, Baiq Arum Laksari, Zarina Oktavia Dwi Lalu Mulyadi Lathifah, Miqro’ Fajari Lestari, Helmayani Lia Nurmayani Lim, Kean Pah Linda Sekar Utami Listari, Ayu Lugi, Fitirana Lutfiah Dina Aulia Lutfiah Dina Aulia Madlazim Madlazim Mahdini Mahdini Mahrus Mahrus, Mahrus Marliani, Nisrina Martiana, Rina Maulia, Kiki Rizki Méité, Namory Méité, Namory Melita, Ayu Safitri Moammar Qadafi Mohamed, Arebat Ryad Alhadei Mohammed, Yusri Muh. Makhrus Muh. Taufik Muhamad Zaenudin, Muhamad Muhammad Dwikhi Mursyam Aldi Muhammad Hanafi Muhammad Ikhsan Muhammad Ikhsan Muhammad Ilham Januarta Muhammad Taufik MUHAMMAD TAUFIK Muhammad Tegar Septiaji Pramudyawan Muhammad Zaini Muhammad Zuhdi Muliadi, Irman Muliyadi, Lalu Munib Munib, Munib Muntari Muntari Muntari Muntari Musta, Baba Napaani Syafaati Nazarudin Ni Luh Putu Pebri Artayani . Ni Nyoman Sri Putu Verawati Ni Nyoman Sugiartini Nisrina, Nina Nur Ulla Azizati Rohima Nuraini Rachma Ardianti Nurjannah, Eka Nurlaela Nurlaela Nurul Hidayah Nurul Hidayah Nuzulia, Chantika Rizki Nyoman Sri Putu Verawati, Ni Nyoman Sridana Oki Alfernando Pah, Lim Kean Pandu, Anggir Pauzi, Iswari Pineda, Chester Ian S. Pratiwi, Rosi Prayogi, Saiful Purwoko, Agus Abi Puspita, Dewa Ayu Dwik Dela Putri , Izlayani Putu Artayasa Qahfi, Bung Ashabul Rahmatin, Johana Aulina Ramadan, Agus Ramilia Laksmi Utari Umar Ratnasari, Rika Raudah Anjani Rehman, Khaista Restuningdyah, Novia Andansari Putri Rika Ratnasari Rizky Munandar Rodi Atma Putra Rohani Ronodirdjo, Muhammad Zuhdi Rukmana, Hardianti RUTH RIZE PAAS MEGAHATI, RUTH RIZE PAAS S. Hakim Sa'idah Sa'idah Safitri, Tina Alfiana Sahidu, Haerunisyah Sahidu, Hairunisa Sahlam Sahlam Sahwi, Sahwi Sani, Hadijah Mutiara Sani, Yunita Arian Saprizal Hadisaputra Saputra, Lalu Muhammad Rispan Sugi Saputra, Lalu Rizki Aldi Sari, Linda Silvana Sarkingobir, Yusuf Satipa, Denda Anung Satutik Rahayu Sayuti, Khairil Amir Selviana Haerani Septian Ananda Saputri Setiati, Nunung Shaari, Abdul Halim Shabdin, Muhammad Kashfi Shariff, Khairul Khaizi Mohd Siti Aminah Soeprianto, Hary Sri Astutik Subki Subki Sudirman Sudirman Sudirman Sudirman Suhadi, M. Robi Agus Sukarso, A.A Sukarso, Aa Sukarso, AA. Sukor, Safia Izzati Abd Supriadi Supriadi Susi Putri Nawansi Susilawati Susilawati Susilawati - Susilawati, Susilawati Sutrio Sutrio Syahrial A, Syahrial A Syahrial Ayub Syahrial Ayub, Syahrial SYAHRIAL SYAHRIAL Syamsul Hakim Syarful Annam Tasya Marwah Salsabilla Taufik, M.Si, Muhammad Tia Safira Ubadah, Lazizatul Ullyani, Nurul Upe’ Sinta Wangi Upe’ Sinta Wangi Virgi Puspita Dewi WAHYUDI Wahyudi Wahyudi Wahyudi Wahyudi Wahyudi Wahyuni Arafani Wahyuni Arafani Wati, Eka Prasetia Widianti Widianti Wildan Wildan Windy Aulia Yaakob, Yazid Yap, Siew Hong Yaya, Ouattara Leygnima Yayuk Andayani YUNITA ARIAN SANI ANWAR Yustika Aprilia ‘Ardhuha, Jannatin