Article Per Year (5 Year)
p-Index From 2020 - 2025
1.798
P-Index
This Author published in this journals
All Journal Journal of Experimental and Applied Physics
Hamdi Hamdi
Department of Physics, Universitas Negeri Padang
Control & Systems Engineering Electrical & Electronics Engineering Materials Science & Nanotechnology Physics

Published : 12 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 12 Documents
Search

 1   2 
Magnetic Susceptibility of nanoparticles in the Lubuk Basung Region Anisa Janna; Hamdi Hamdi; Harman Amir; Zulhendra Zulhendra
Journal of Experimental and Applied Physics Vol 2 No 4 (2024): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i4.87

Abstract

Nanoparticles is particles that have size very small, generally in range from 1 to 100 nanometers. Nanoparticles have one​ uniqueness with exists characteristic superparamagnetic. Characteristic superparamagnetic is properties the material has magnetization tall if given external magnetic field, however when No There is external magnetic field mark the average magnetization is zero. On size certain, nanoparticles can show transition from superparamagnetic to ferromagnetic or antiferromagnetic. Influence size grain and structure crystal to characteristic magnetic is one​ method in determine susceptibility. Susceptibility magnetic is defining constant​ big small a material to magnetized. Study This aim to the analyze mark susceptibility magnetic from nanoparticles rock floating in the area Lubuk Basung. Method used​ is method magnetism rock with tool Bartington Magnetic Susceptibility Meter Type B. Research results shows in the area Lubuk Basung LBS 23-02 and LBS 23-03 are available concentration content high Fe element and concentration content element Ti more low. Magnetic susceptibility in the area Lubuk Basung have characteristic antiferromagnetic magnetism, and has type grain almost no There is details superparamagnetic and also has mixture superparamagnetic and granular rough or details superparamagnetic <0.05 μm equivalent with <50 nm. So that depicted that size nanoparticles contained in the sample rock floating LBS 23-02 and LBS 23-03 have size nanoparticles below 50 nanometers with characteristic antiferromagnetic magnetism.
Analysis Of Normal Stress Distribution Of Earthquakes In The Fault Segment Of The West Sumatra Region Using The Stress Inversion Method: English Ellen Kurniawati Daya; Syafriani Syafriani; Hamdi Hamdi; Harman Amir
Journal of Experimental and Applied Physics Vol 2 No 4 (2024): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i4.88

Abstract

West Sumatra was one of the regions on the island of Sumatra that had a high level of earthquake proneness. There were five segments of the Sumatran fault in this region. Normal stress distribution analysis could be carried out to determine tectonic activity in earthquake-prone areas. This research used the stress inversion method to identify normal stresses, which could trigger or inhibit fractures. The data used involved 17 fault plane parameters (strike, dip, rake) from earthquakes with a magnitude of ≥4.7 that occurred in the West Sumatra region from 1967-2023. The type of fault analysed was strike-slip, and the earthquake's epicenter was located on land. The results of this research provided an overview of the position and direction of normal stress due to earthquakes in the West Sumatra region. The distribution of the normal stress position of the fault segment was shown through the pressure and tension axes (P/T), with respectively sigma1, sigma2, and sigma3 having azimuth/plunge values of 353.990/4.760, 247.260/73.860, and 85.310/15.380. The direction of maximum normal stress (sigma1) is spreading in the northern part of the fault segment. In contrast, intermediate normal stress (sigma1) is situated in the western sector of the fault segment, while minimum normal stress (sigma3) is in the eastern part of the fault segment in this region. Analysis of the normal stress distribution is showing that the Talamau segment is being dominated by maximum normal stress, indicating that the Pasaman area and its surroundings are being considered vulnerable to faults and earthquakes.
Co-Authors Ahmad Fauzi Anisa Janna Dian Laila Fitri Ellen Kurniawati Daya Fatni Mufit Harman Amir Ika Sri Fahmi Julio Fadjar Kolotosa Letmi Dwiridal Linda Susanti Lingga Ayunda Pradipta Mutiara Kusuma Febriwanti Nur Azizah Rifqa Hayati Syafriani Syafriani Yoga Yusrila Zellvia Elizha Zulhendra Zulhendra