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Radhitya Perdhana
Tanjungpura University
Astronomy Earth & Planetary Sciences Energy Materials Science & Nanotechnology Medicine & Pharmacology Physics Other

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Efek Plasmon pada Suseptibilitas Nanohybrid Quantum Dot-Metal Nanoparticle: Pengaruh Jarak Antar Nanoparticle Sismita Sismita; Bintoro Siswo Nugroho; Radhitya Perdhana
PRISMA FISIKA Vol. 11 No. 2 (2023)
Publisher : FMIPA, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/pf.v11i2.65077

Abstract

Telah dilakukan studi teoretis gabungan antara semiconductor quantum dot (SQD) yang dimodelkan sebagai two-level system dan metal nanoparticle (MNP) berbentuk core shell untuk menentukan suseptibilitas dari sistem nanohybrid tersebut. SQD difungsikan secara kuantum dengan formalisme density matrix. MNP difungsikan secara klasik dan dikarakterisasi menurut nilai polarisabilitas yang bergantung pada jenis MNP yang digunakan. Suseptibilitas sistem ditentukan dengan menyelesaikan persamaan gerak elemen density matrix secara analitik dan numerik dengan metode Runge-Kutta-Fehlberg 45. Hasil penelitian menunjukkan bahwa jarak antara SQD dan MNP yang didekatkan menyebabkan puncak spektrum bagian imajiner suseptibilitas mengalami pelebaran dan bergeser ke energi yang lebih tinggi.
Using Gravity Anomaly for Subsurface Modeling and Earthquake Hypocenter for Active Fault Characterization in West Sulawesi Siti Purnawasih; Muhardi Muhardi; Radhitya Perdhana
BULETIN FISIKA Vol. 27 No. 2 (2026): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2026.v27.i02.p08

Abstract

An active fault triggered the earthquake in West Sulawesi on 15 January 2021, because this region has high tectonic activity. This study aims to model the subsurface and characterize active faults using gravity anomaly and earthquake hypocenter data, respectively. Gravity anomaly data at 2,640 measurement points were obtained from the TOPEX satellite, while earthquake hypocenter data for the 2011-2021 period were obtained from the USGS, IRIS, and Geofone websites. A complete Bouguer anomaly (CBA) distribution was obtained from free air anomaly (FAA) and topographic data using terrain and Bouguer corrections. The 2D modeling of subsurface geological structures was performed based on the regional anomaly distribution obtained by subtracting the complete Bouguer anomaly from the residual anomaly. Determining the earthquake focal mechanism uses the tensor moment method, which is represented visually as a beachball. The results show a regional anomaly distribution of 30-86 mGal. The 2D modeling shows that the subsurface consists of nine rock formations: Mandar Formation, Mapi Formation, Intrusive Rocks, Talaya Volcanic Rocks, Latimojong Formation, Intermontane Deposits, Mamuju Formation, Tapalang Member, and Adang Volcanic Rocks. Based on the earthquake focus mechanism, represented visually as a beach ball, six active faults were identified: two thrust faults, three strike-slip faults, and a normal fault.
Co-Authors Bintoro Siswo Nugroho Muhardi Sismita Sismita Siti Purnawasih