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All Journal Jurnal Ilmu Dasar BERKALA SAINSTEK JURNAL FISIKA ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Jurnal Penelitian Pendidikan IPA (JPPIPA) INDONESIAN JOURNAL OF APPLIED PHYSICS Jurnal Pendidikan Fisika dan Keilmuan (JPFK) Spektra: Jurnal Fisika dan Aplikasinya Jurnal Ilmu Fisika Majalah Ilmiah Matematika dan Statistika (MIMS) Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) Journal of Energy, Material, and Instrumentation Technology PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Newton-Maxwell Journal of Physics TEFLICS InSTEM
Lutfi Rohman
Jurusan Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Jember (UNEJ)
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Other

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Validasi Kode OpenMC pada Reaktor Gas Berpendingin Helium Berbahan Bakar UC-PuC Karomah, Iklimatul; Syarifah, Ratna Dewi; Trianti, Nuri; Arkundato, Artoto; Rohman, Lutfi; Maulina, Wenny; Purwandari, Endhah; Hidayat, Umar Sahiful
Newton-Maxwell Journal of Physics Vol. 4 No. 1: April 2023
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/nmj.v4i1.26998

Abstract

Validasi perhitungan kekritisan pada Gas Cooled Fast Reactor (GFR) menggunakan kode OpenMC dan SRAC telah dilakukan. OpenMC merupakan kode analisis neutronik yang bersifat open source dan probabilistik yang sedang dikembangkan oleh MIT hingga sekarang. Validasi kode OpenMC perlu dilakukan untuk menunjukkan hasil validitas perhitungan OpenMC dibandingkan dengan kode lainnya. OpenMC yang bersifat probabilistik, mensimulasikan random sampling partikel yang berjumlah besar. Hal terseut bertujuan untuk menunjukkan akurasi perhitungan OpenMC dengan menggunakan partikel yang berjumlah kecil. Validasi dilakukan dengan melihat selisih perhitungan nilai  dari kode OpenMC dan SRAC. Nilai konvergensi yang dihasilkan dari kode OpenMC dan SRAC dikatakan tervalidasi dengan memiliki nilai error <1%. Pada penelitian ini menggunakan 50.000 partikel dengan total pengulangan 100 batch aktif dan 30 batch tidak aktif yang disimulasikan. Hasil perbandingan menunjukkan bahwa OpenMC memiliki error maksimal 0,06% terhadap hasil perhitungan kode SRAC
Thermal Conductivity of Liquid Lead for the Fast Nuclear Reactor Coolant, Calculated by the Green-Kubo Method Using Molecular Dynamics Simulation Artoto Arkundato; Ratna Dewi Syarifah; Lutfi Rohman; Wenny Maulina; Widiasih
Jurnal Penelitian Pendidikan IPA Vol 9 No 12 (2023): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i12.6102

Abstract

Comprehensive information about nuclear reactor coolant materials for application in heat-transfer systems is very important. One important physical property that needs to be known is the thermal conductivity. The goal of this work is to predict the thermal conductivity value of the liquid lead, which is one of the important candidates for cooling materials for Gen-IV fast nuclear reactor designs. The thermal conductivity of liquid lead in this study was predicted using the Green-Kubo scheme and the molecular dynamics (MD) computational method to collect the simulation data. The MD simulation was done in the NVT ensemble, using the Lennard-Jones interaction potential. We observe the thermal conductivity of the liquid lead can be studied based on the diffusion physical process. The thermal conductivity of the liquid lead obtained from this research is λ = 0.0113T + 8.8539 [W/mK]. As a conclusion, this result is very suitable, compared with the available experimental data, then the Green-Kubo method can be used to calculate the thermal conductivity of liquid metal as lead.
Shakemap and Focal Mechanism Analysis of the December 2024 Gresik Earthquake Mochamad Tanwiruz Zaman; Agus Suprianto; Lutfi Rohman; Bowo Eko Cahyono
Spektra: Jurnal Fisika dan Aplikasinya Vol. 11 No. 1 (2026): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 11 Issue 1, April 2026
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.111.04

Abstract

An earthquake that occurred on December 30, 2024 in Gresik Regency, located at 7.05° S and 112.62° E with a focal depth of 14 km and magnitude M3.3, was a shallow earthquake felt with an intensity of II–III MMI. This study aims to analyze the earthquake shaking intensity map (Shakemap), determine the earthquake source mechanism, and perform earthquake scenario modeling using the maximum magnitude based on the Indonesian Earthquake Source and Hazard Map (PUSGEN). Shakemap analysis was carried out using the BMKG Shakemap server based on accelerograph network data. Fault mechanism analysis was performed using focal mechanism software with P-wave polarity input obtained from waveform signal picking using SeisGram2K software. Meanwhile, the Shakemap scenario was generated using the ShakeMap application available at the Pasuruan Geophysical Station. The results show that the distribution of Peak Ground Acceleration (PGA) and shaking intensity is influenced not only by the distance from the epicenter but also by local geological conditions that contribute to ground-motion amplification. Source mechanism analysis indicates that the Gresik earthquake was dominated by a strike-slip faulting mechanism with a weak oblique component, interpreted as sinistral strike-slip motion along the RMKS–Tuban 3 fault zone. Scenario earthquake modeling with a magnitude of M 6.2 indicates that Gresik Regency has the potential to experience strong ground shaking with maximum intensities reaching VI–VII MMI, while surrounding areas such as Surabaya City, eastern Lamongan Regency, and western Bangkalan Regency may experience intensities up to VI MMI. These findings indicate that although the Gresik earthquake had a relatively small magnitude, the potential earthquake impact in Gresik and surrounding areas could become significant if a maximum-magnitude earthquake occurs, therefore, this study provides important information for earthquake disaster mitigation efforts.
Temperatur Curie dan Medan Koersivitas Material Co0,8Ni0,2 dalam Struktur Random Alloy dan Double Layers Lutfi Rohman; Suci Novitasari; Supriyadi Supriyadi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (598.215 KB) | DOI: 10.13057/ijap.v10i01.31346

Abstract

Material Kobalt Nikel (CoNi) merupakan paduan penting karena memiliki sifat kemagnetan yang baik diantaranya yaitu temperatur curie dan koersivitas yang tinggi. komposisi, struktur alloy dan ukuran sisi kubus bahan berpengaruh terhadap temperatur Curie dan koersivitas. Simulasi mikromagnetik dilakukan pada material Co0,8Ni0,2 dengan struktur random alloy dan double layers untuk menentukan nilai temperatur Curie dan analisis kurva histerisis. Simulasi material Co0,8Ni0,2 dilakukan menggunakan software Vampire dengan variasi ukuran sisi kubus yang digunakan yaitu 5 nm, 8 nm, 10 nm, 12 nm, dan 15 nm. Hasil simulasi menunjukkan nilai temperatur Curie semakin meningkat dengan bertambahnya ukuran sisi kubus. Pada material Co0,8Ni0,2 double layers diperoleh nilai temperatur Curie lebih tinggi dari pada material Co0,8Ni0,2 random alloy. Karakteristik kurva histerisis pada material Co0,8Ni0,2 random alloy dan double layers menunjukkan bahwa nilai koersivitas meningkat seiring bertambahnya ukuran sisi kubus. Namun pada material Co0,8Ni0,2 random alloy ketika ukuran bahan yang diberikan 12 nm dan 15 nm nilai medan koersivitasnya semakin menurun, dibandingkan saat ukuran 10 nm. Pada ukuran sisi kubus 10 nm dikatakan sebagai ukuran terbaik dari material Co0,8Ni0,2 random alloy ditinjau dari nilai medan koersivitas yang besar.
Co-Authors Agus Setyo Budi Agus Suprianto Al Islam, Hanif Mufti Arofah, Siti Lailatul Artoto Arkundato Ayudia, Siti Aisyah Bowo Eko Cahyono Cuk Imawan Dita Puspita, Dita Edy Supriyanto Endhah Purwandari Fachry Abda El Rahman Febiantoro, Muhamad Rony Firdaus, Rohim Aminullah Fitri Ayu Sundari Hadi Nasbey Hasanah, Irmawati Hidayah, Elok Hidayat, Umar Sahiful I Made Astra Imam Wahyudi Indrawan, Imam Wahyudi Irvan Siswanto Iwan Sugihartono Karomah, Iklimatul Mabruri, Ahmad Muzaki Maulana, Muhammad Rizqi Mochamad Tanwiruz Zaman Mohammad Ali Shafii Musyarofah, L. Nikodemus Umbu Janga Hauwali Ni’mah, Khiptiatun NUR OCTAVINA, CHOIRINA RACHMA Prasetya, Fajri Sahiroh, Samakhatus Sa’adah, Umi Sifa Alfiyah Suci Novitasari Sulisti, Wahyu Supripyanto, Edy Supriyadi Supriyadi Sutisna Sutisna Syarifah, Ratna Dewi Trianti, Nuri Wenny Maulina Wibawa Wibawa, Wibawa Wicaksono, Angga Widiasih Yuliana Yuliana