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All Journal Jurnal Fisika Unand Jurnal Ilmu Fisika
Maulidan, Ikhwan Fikri
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Astronomy Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Interpretation of Subsurface Structure Based on the Magnetic Data at Semurup Geothermal Area Kerinci Maulidan, Ikhwan Fikri; Tri Suci, Ratika; Mahendra, Andre; Putra, Ardian
Jurnal Ilmu Fisika Vol 13, No 2 (2021): September 2021
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.13.2.101-108.2021

Abstract

The interpretation of subsurface structures in Semurup geothermal area has been carried out using the geomagnetic method. Data were collected in an area of 1500 m × 1400 m consisting of 160 points. The magnetic anomaly value obtained was derived from the total magnetic induction value that has been corrected by IGRF and diurnal variation, then transformed by reduction to equator and upward continuation to remove noise and separate local and regional anomalies. The results of data processing showed the total magnetic field values in the study area ranged from -1730.4 nT to 1909.0 nT. Magnetic anomalies in this study area are dominated by negative values that may be caused by demagnetised rocks (a result of hydrothermal alteration). The results of 2D modeling, it has 5 rock layers that can be classified into 3 main parts of the geothermal system The first and second layers are caprock with a depth of up to 850 meters consisting of sedimentary rock, clay, and sandstone. The third layer is indicated as a reservoir with a depth from 850 to 1450 m and is dominated by sandstone and clay alteration Hot rock in the fourth and fifth layers is dominated by basalt igneous rock and the presence of dacitic lava intrusion from the northeast of the study area at depths below 1450 m, and the Siulak fault as a outflow zone for geothermal fluid. The presence of the caprock, reservoir, hot rock, and fault zones indicates that the Semurup area has geothermal potential and is suitable for further exploration.
Pengaruh Geometri dan Polarisasi Cahaya terhadap Resonansi Plasmon Nanopartikel Ellipsoid Core-Shell SiO₂@Ag dan SiO₂@Au Novianti, Noni; Syaibah, Abi; Maulidan, Ikhwan Fikri; Muldarisnur, Mulda
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.379-386.2025

Abstract

This study reports the optical behaviors of SiO₂@Ag and SiO₂@Au core-shell ellipsoidal nanoparticles in terms of polarization of light and geometrical parameter changes. The particles showed two strong modes of resonances, longitudinal and transversal, which could be controlled by rotating the polarization of incident light by 90° and thus could find applications as sensor and optical switch devices. While the resonant wavelength is independent of polarization direction, while maximum extinction values indicate pronounced changes. SiO₂@Ag nanoparticle exhibit higher maximum extinction as well as the peak of resonance at a shorter wavelength than SiO₂@Au. Furthermore, an increase in the ratio of core diameter to shell induces a blue-shift and increasing extinction value. The overall particle size has no influence on the location of the peak of the resonance but increases the extinction intensity. The larger ratio of short axis to long axis also brings about blue-shift in longitudinal resonances. The finding demonstrates that core-shell structure control and morphology control can be used to engineer nanoparticle optical performance in diverse nanophotonic applications.
Co-Authors Andre Mahendra Ardian Putra Muldarisnur, Mulda Novianti, Noni Syaibah, Abi Tri Suci, Ratika