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Jurnal Fisika Unand
Published by Universitas Andalas
ISSN : 23028491     EISSN : 26862433     DOI : https://doi.org/10.25077/jfu
Core Subject : Science, Engineering,
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
Makalah yang dapat dipublikasikan dalam jurnal ini adalah makalah dalam bidang Fisika meliputi Fisika Atmosfir, Fisika Bumi, Fisika Intrumentasi, Fisika Material, Fisika Nuklir, Fisika Radiasi, Fisika Komputasi, Fisika Teori, Biofisika, ataupun bidang lain yang masih ada kaitannya dengan ilmu fisika.
Arjuna Subject : Fisika dan Astronomi - Fisika Nuklir dan Molekuler, dan Ooptik
Articles 15 Documents
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Search results for , issue "Vol 14 No 3 (2025)" : 15 Documents clear
Suseptibilitas Magnetik, pH dan Kandungan Mineral untuk Uji Tingkat Kesuburan Tanah pada Lahan Perkebunan Kemiri di Kecamatan IX Koto Sungai Lasi Oktavia, Geby Sri Ayu; Pohan, Ahmad Fauzi
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.263-269.2025

Abstract

Research has been conducted on the value of magnetic susceptibility, pH and mineral content to test the level of soil fertility in Nagari Indudur, District IX Koto Sungai Lasi. Samples were taken at the location of candlenut plantations in two different locations that were suspected of experiencing a decrease in soil fertility. Sampling was taken at 6 points with three depth variations, 30 cm, 60 cm and 90 cm so that 36 samples were obtained. The distance between sampling points is 2 m. Magnetic susceptibility measurements using the MS2B Bartington Susceptibility Meter using two frequencies, namely 0,47 kHz LF (Low Frequency) and 4.7 kHz HF (High Frequency). At location 1, the average value obtained is 181.2089 x10-8 m3/kg, while the average χHF value obtained is 170.5870x10-8 m3/kg. At location 2 the average χLF value obtained is 487.6539x10-8 m3/kg, while the average χHF value obtained is 480.5271 x10-8 m3/kg. with an average pH in both locations of candlenut plantations is acidic. This occurs because of the excess of Si and Al elements that make the plantation soil acidic, as well as the deficiency of Magnesium (Mg) and sulfur, minerals that make candlenut plants experience a decrease in production. Besides that deposition on plantation land is also one of the triggers for soil in the plantation location to experience a decrease in soil fertility.
Optimalisasi Priority Pada Organ at Risk (OAR) Kanker Nasofaring Menggunakan Teknik Intensity Modulated Radiation Therapy (IMRT) Relis, Septya Annisa; Dian Milvita; Fiqi Diyona
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.270-278.2025

Abstract

Optimization of priority on Organ At Risk (OAR) of nasopharyngeal cancer using Intensity Modulated Radiation Therapy (IMRT) technique has been conducted. The research was conducted using 5 images of nasopharyngeal cancer patients processed using Treatment Planning System (TPS) Eclipse software at Andalas University Hospital. The purpose of this study was to determine the priority value of Planning Target Volume (PTV) and OAR by analyzing the value of Conformity Index (CI), Homogeneity Index (HI) and OAR radiation dose on the Dose Volume Histogram (DVH) curve based on 6 planning variations. The planning variations used are priority values on PTV 100,110,120,130,140 and 150. Variations of priority values on OAR 40,50,60,70,80 and 90. The results of the study obtained the optimal priority value for each nasopharyngeal cancer patient's initials are S, J, SS, ED and B for PTV which is 120. On the brain stem OAR is 103, 85, 90, 103, and 85. The spinal cord OAR is 82,88,85,85, and 85. The OAR of the eye lens was 58,100,90,85 and 90. The OAR of the eye was 65,90,70,0 and 80. The OAR of the mandible was 72,100,90,99 and 80. Analysis of CI and HI values based on the International Commission on Radiation Units and Measures (ICRU) Report 62 and 83. The radiation dose to the OAR was verified based on the Quantitative Analysis of Normal Tissue Effect in the Clinic (QUANTEC) standard. The priority value obtained in this study will be a reference for medical physicists in making radiotherapy planning.
Pemetaan Zona Rawan Longsor di Kawasan Agam-Bukittinggi Berbasis Google Earth Engine Menggunakan Teknik Evaluasi Multi-Kriteria Hilalliyah, Nisful; Namigo, Elistia Liza
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.242-248.2025

Abstract

Landslide vulnerability zone mapping with Google Earth Engine (GEE) has been conducted through a multi-criteria evaluation technique that encompasses scoring, categorization, and overlay of five landslide characteristics in the Agam and Bukittinggi regions of West Sumatra. The criteria utilized are slope, rainfall, land usage, rock type, and soil type. The supervised classification technique employing a random forest classifier is utilized to generate land use categorization maps. The mapping results indicate that the Agam-Bukittinggi region is predominantly characterized by a high to very high degree of landslide susceptibility, encompassing 77,5% (1680,55 km2) of the overall research area, with a medium level of vulnerability. Regions exhibiting high to very high susceptibility to landslides including Tanjung Raya District, Matur District, Malalak District, IV Koto District, Palupuh District, Palembayan District, Tilatang Kamang District, Ampek Angkek District, Kamang Magek District, Banuhampu District, Matur District, Sungai Pua District, Candung District, Baso District and Bukittinggi City. Simultaneously, there exists a 22% risk of moderate landslides in Ampek Nagari District, Lubuk Basung, and Tanjung Mutiara Districtsis.
ANALISIS AKTIVITAS SPESIFIK RADIONUKLIDA DI KAWASAN BALAI PENELITIAN TERNAK UNGGUL DAN HIJAUAN PAKAN TERNAK (BPTU-HPT) PADANG MANGATAS SUMATERA BARAT Regiska, Nadia; Milvita, Dian; Sukadana, I Gde; Effendi, Erawan; Ramadhani, Syarifah
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.255-262.2025

Abstract

Specific activity analysis of radionuclides in the area of the Research Center for Superior Livestock and Green Animal Feed (BPTU-HPT) Padang Mangatas, West Sumatra has been conducted. This study aims to determine the specific activity of natural radionuclides Ra-226, Th-232, Th-228, K-40 and U-238 based on PERKA BAPETEN NO.16 of 2013 and artificial radionuclides Cs-137 based on PERKA BAPETEN NO.16 of 2012 and determine the distribution of radionuclides based on contour maps. The measured samples consisted of 1 kg of soil at a depth of (010) cm, (10-20) cm and (20-30) cm at 6 location points, 2 kg of grass, and 2 liters of water. The study began with sample preparation, then measured for 17 hours using a calibrated gamma spectrometer. The measurement results showed the specific activity of radionuclides Ra-226, Th-232, Th-228, K-40, U-238 and Cs137 in some soil and grass samples but were not detected in water samples. The specific activity of natural radionuclides in soil and grass samples is below the maximum limit set by PERKA BAPETEN NO.16 of 2013 which is 1000 Bq/kg and Cs-137 is below the maximum limit set by PERKA BAPETEN No. 16 of 2012 which is 100 Bq/kg. The distribution of radionuclide specific activity in the BPTU-HPT Padang Mangatas area based on contour maps has a varied distribution and is significantly distributed in soil samples at a depth of (20-30) cm.
Tinjauan Klimatologis Kejadian Banjir Bandang di Kabupaten Lahat, Sumatera Selatan Tanggal 5 Juli 2023 Mediany, Shinta; Haryanto, Yosafat Donni; Fadlan, Ahmad
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.279-290.2025

Abstract

BPBD reported that a flash flood occurred in Lahat Regency due to high rainfall in the early hours of Wednesday, July 5, 2023. This led to an overflow of the Lematang River, causing flooding that submerged roads and parts of residential areas. Therefore, research is essential to understand atmospheric dynamics and review climatological conditions during the flash flood event in Lahat Regency, covering Pulau Pinang District, Lahat District, and Mulak Sebingkai District. This research is expected to serve as a scientific basis for mitigation and adaptation measures against hydrometeorological disasters. Global phenomena such as the Madden–Julian Oscillation (MJO), El Niño Southern Oscillation (ENSO), and monsoon activity have been analyzed. The analysis of local and regional-scale meteorological parameters was conducted using atmospheric reanalysis datasets from JRA-3Q, NCEP/NCAR, and NCICS. Additionally, a climatological review was carried out based on rainfall data from several cooperative rain gauge stations around the affected area, supplemented with GSMaP satellite data. The study indicates that the flash flood was caused by heavy to very heavy rainfall in the surrounding areas. This rainfall resulted from several factors, including the active MJO over the Indian Ocean, wind convergence, and the presence of the Intertropical Convergence Zone (ITCZ) extending along the western part of Sumatra. The presence of a low-pressure area enhanced the potential for convective cloud formation, further intensified by atmospheric moisture levels exceeding 80% at the 850 mb layer, increasing water vapor content in the upper atmosphere. A historical data review shows that, climatologically, the rainfall during the flash flood event represented the highest recorded daily maximum rainfall for July within the observation period, surpassing pentad and decadal averages. The influence of global, regional, and local-scale phenomena contributed to the increased rainfall intensity in the flash flood-affected area.
Analisis Ketidakstabilan Lereng Berdasarkan Nilai Suseptibilitas Magnetik (Studi Kasus: Dua Lereng di Nagari Sikucur Tengah, Padang Pariaman) Mulia, Bagas Meiza; Budiman, Arif
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.205-211.2025

Abstract

A study has been conducted for slope instability analysis based on magnetic susceptibility values ​​in Nagari Sikucur Tengah, Padang Pariaman. Soil sampling was carried out on two tracks from slopes without vegetation (Path A) and slopes with vegetation (Path B) and one reference point. Measurement of magnetic susceptibility values ​​of samples using the Bartington Susceptibility Meter using two frequencies, namely low frequency (lf) and high frequency (hf). Based on the magnetic susceptibility value at low frequency (κlf), it was obtained that the magnetic minerals that control the reference point samples are ferrimagnetic, while samples from Path A and Path B are ferrimagnetic and paramagnetic, but some samples from Path B are ferrimagnetic. The relationship between the κlf value and the depth at the reference point shows a consistent pattern of decreasing values, while Path A and Path B fluctuate and the κlf value at Path A is much smaller than Path B from the reference point. Based on the frequency-dependent susceptibility value κfd, the sample of Path A is dominated by superparamagnetic domains, indicating that the sample has much smaller grains than the sample of Path B. Both slopes have experienced instability, where the slope of Path A has experienced higher instability than the slope of Path B.
Kajian Perubahan Garis Pantai Kabupaten Bengkulu Utara dengan Interpretasi Citra Penginderaan Jauh dan Digital Shoreline System Septianingsih, Dwi; Amalia, Isra; Johan, Septi; Lidiawati, Liza
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.218-227.2025

Abstract

The coastal area of ​​North Bengkulu often experiences abrasion and accretion processes, considering its location directly facing the vast waters of the Indian Ocean. This phenomenon can have an impact on changes in the coastline in the area. This study aims to identify changes in the coastline over time by utilizing multi-sensor satellite imagery from USGS. The focus is to measure changes in the distance of coastal areas in North Bengkulu Regency. Changes in the coastline in this area are calculated statistically using the Digital Shoreline Analysis System (DSAS). The results of the average calculation of the distance of changes in the coastline from 2014 to 2023 in North Bengkulu Regency are influenced by quite large abrasion and accretion of -20.31 meters and 21.6 meters. The impact of accretion shows a higher value than abrasion due to the addition of land (sedimentation) in a number of river estuaries in North Bengkulu Regency. Changes in the coastline are influenced by the dynamics of seasonal winds and sea waves due to the East and West Monsoons, impacting coastal settlements, infrastructure, and ecosystems such as coral reefs and mangrove forests
Natural Clay yang Dimodifikasi Nikel dan Aplikasi Katalitik Untuk Produksi FAME : Efek Support dan Prekursor Nikel Admi, Admi; Mustika, Mega; Syukri, Syukri
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.235-241.2025

Abstract

This study was conducted to investigate the use of nickel modified clay as heterogeneous catalyst for the production of fatty acid methyl ester (FAME) from crude palm oil (CPO). The catalyst was prepared by Ni2+- exchanged cation supported on clay under controlled conditions. The results of X-ray Fluorescence analysis (XRF) indicated that Ni2+- exchanged cation modified on support of clay. The results of X-ray Diffraction (XRD) analysis confirmed that support of clay with characteristic of kaolinite mineral. Effect of supports of clay (h-clay and c/h-clay) and effect of nickel precursors (nickel sulfate and nickel nitrate) on the catalytic performance of heterogeneous catalysts in the transesterification reaction of CPO were investigated. The obtained data showed that transesterification processes at oil/methanol ratio of 1 : 6, reaction temperature of 85 oC, catalyst/methanol ratio of 1 : 10, and reaction time of 4 h produced yield of 51,19% FAME, 1,9% FAME, 4,74% FAME, and 47,8% FAME for catalytic performance of h-clay, c/h-clay, h-clay/Ni-Sulfate and h-clay/Ni-Nitrate, respectively. Ni2+- exchanged cation supported on h-clay prepared using two different precursors, nickel nitrate indicating higher catalytic activity than nickel sulfate.
Penerapan Algoritma Deep Learning YOLOv8 pada Platform Roboflow untuk Segmentasi Citra Panoramik Mahdiyah, Luqyana; Oktamuliani, Sri; Putri, Wulandani Liza
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.228-234.2025

Abstract

Dental panoramic image segmentation plays a crucial role in dental diagnosis, as it aids in the identification of dental conditions and other oral structures more quickly and accurately. However, manual segmentation processes are often time-consuming and require specialized expertise. Therefore, Artificial Intelligence (AI)-based technology presents a potential solution to enhance efficiency. This study aims to develop a deep learning algorithm for automatic segmentation of dental panoramic images. The model used was trained with 302 dental panoramic images across 32 classes, encompassing 9009 teeth. The segmentation process was carried out on the Roboflow platform, which provides evaluation metrics to assess the model’s performance. Evaluation results revealed a mean Average Precision (mAP) of 95%, recall of 93.1%, and precision of 93.7%, indicating a high level of accuracy in detecting and segmenting teeth. However, challenges arise in certain image conditions, such as teeth that are reduced to roots or teeth positioned abnormally. Overall, the model demonstrates significant potential to improve the efficiency and accuracy of dental panoramic image analysis. This research contributes significantly to the development of faster and more accurate AI-based dental diagnostic systems .
Peningkatan Kualitas Bio-Oil Hasil Pirolisis Cangkang Kelapa Sawit Berstandar Pelumas Organik Wiraya, Wira Arta; Rifaldi, Kornelius; Muljani, Srie; Siswati, Nana Dyah; Karaman, Novel
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.249-254.2025

Abstract

Palm kernel shells are biomass waste that has the potential to be processed into bio-oil through pyrolysis, but its quality needs to be improved to meet organic lubricant standards. This study aims to improve the quality of bio-oil through a transesterification process with activated carbon-NaOH catalyst and the addition of guar gum as a thickening agent. Pyrolysis was carried out at a temperature of 300°C for 60 minutes, and transesterification at a temperature of 60°C for 2 hours with a methanol:bio-oil ratio of 6:1. The results showed that increasing the amount of catalyst up to 10% increased the yield of methyl ester, while the addition of guar gum increased the kinematic viscosity to 7.9 cst, approaching commercial lubricant standards such as top 1 Evo 5W-30 and pertamina fastron gold 5W-30. However, the flash point is still lower than industrial lubricants. Thus, the quality of bio-oil from palm kernel shell pyrolysis can be improved to approach organic lubricant standards, making it a more environmentally friendly alternative lubricant and has the potential for industrial applications.

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