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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 36 Documents
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Search results for , issue "Vol 13 No 5 (2024)" : 36 Documents clear
Analisis Korelasi Umur, Massa Tubuh dan Faktor Eksposi Terhadap Entrance Surface Air Kerma pada Pemeriksaan Thorax di Rumah Sakit Universitas Andalas Sari, Suci Indah; Milvita, Dian; Fardela, Ramacos; Pratama, Ida Bagus Gede Putra; S, Amel Oktavia
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.602-609.2024

Abstract

Research has been conducted on the correlation analysis of age, body mass, and exposure factors to Entrance Surface Air Kerma (ESAK) in the Radiology Installation of Andalas University Hospital. The study was conducted by collecting data on adult thorax examination patients over 15 years of age and body mass (60 ± 10) kg in Posterior-Anterior (PA) and Anterior-Posterior (AP) projections for ± 5 months. Patient data used in PA projections are 107 patient data with the Automatic Exposure Control (AEC) method, 9 patient data with manual methods and 10 AP projection patient data with manual methods. Analysis was conducted using the Pearson correlation test. The results showed that body mass and exposure factors have a very strong relationship with ESAK as indicated by r = 0.805 to 0.990. As body mass and exposure factor increase, the average ESAK received by patients will increase, while age has a weak relationship with ESAK as shown by r = -0,246 to 0,227.
SUSEPTIBILITAS MAGNETIK TANAH SEBAGAI INDIKATOR TANAH LONGSOR DI DAERAH MALAMPAH KABUPATEN PASAMAN Fitriah, Rahmatul; Afdal, Afdal
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.697-703.2024

Abstract

Soil magnetic susceptibility values have been measured in the Malampah area of Pasaman Regency using the rock magnetism method. Samples were taken from two areas where landslides had occurred and two areas where landslides had not occurred. Samples were taken at the top, middle, and bottom with 5 cm, 25 cm, and 50 cm depth variations. Measurement of soil magnetic susceptibility value was conducted using Bartington Susceptibility Meter MS2B. The results showed that the magnetic susceptibility value at low frequency (ꭓLF) at each sampling point is higher than the high-frequency magnetic susceptibility value (ꭓHF). Indicating that the research location contains superparamagnetic grains. From the range of ꭓLF values obtained, it is estimated that the magnetic minerals that control the samples are paramagnetic and ferromagnetic and the mineral type is estimated to be ilmenite (FeTiO3). Areas where landslides have occurred have a higher ꭓFD (%) value than areas where landslides have not occurred. The higher the ꭓFD (%) value, the more superparamagnetic grains will be in the sample. Superparamagnetic grains are smooth and easily absorb water. Adding soil mass due to water causes the soil to move quickly when on a slope.
Verifikasi Dosis Radiasi Permukaan pada Kasus Kanker Payudara Menggunakan Metode Dosimetri In Vivo Wulandari, Sri; Adrial, Rico; Ulya, Syarifatul; Diyona, Fiqi
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.630-636.2024

Abstract

Verification of surface radiation dose in breast cancer cases using the in vivo dosimetry method with TLD-100 at the Radiation Oncology Unit of Andalas University Hospital has been carried out. The aim of the study is to verify the adequacy of the surface radiation dose calculated by the Treatment Planning System (TPS) with the measured radiation dose of TLD-100, referring to the report of the American Association of Physicists in Medicine Task Group No.219 (AAPM-TG No.219). This study began with the annealing of the TLD-100, namely the cleaning of the electrons trapped by the TLD-100 at the Research Center for Safety Technology Metrology and Nuclear Quality of the National Innovation Research Agency (PRTKMMR-BRIN), followed by the scanning of the TLD-100 on the surface of the phantom plate using a CT simulator. In addition, the TLD-100 was calibrated with different radiation doses (0; 20; 50; 80; 100; 150; 200; 250; 370) cGy. Verification of surface radiation dose on five breast cancer treatment planning data with TPS surface radiation dose calculation by Patient Specific Quality Assurance (PSQA) or transfer of patient treatment plan to slab phantom and compared with radiation dose measured on TLD 100. The measured surface radiation dose was found to range from 115.07 cGy to 130.81 cGy. Verification showed that the difference between the radiation dose calculated by the TPS and that measured by the TLD-100 was 0.21% to 8.13%. This shows that the surface radiation dose in breast cancer cases is within the 20% tolerance limit set by AAPM-TG No.219.
Identifikasi Pencemaran Air Laut di Pesisir Pantai Sungai Pisang Kota Padang Ditinjau dari Parameter Fisika dan Kimia Rinaldi, Muhammad; Puryanti, Dwi; Purwanto, Eko
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.690-696.2024

Abstract

This research aims to identify seawater pollution by determining the concentration of heavy metals (Pb, Cd, and Cu), electrical conductivity, total dissolved solids (TDS), total suspended solids (TSS), temperature, and pH in seawater samples from the coast of Sungai. Pisang, Padang City. Heavy metal concentration values were measured using an Atomic Absorption Spectroscopy (AAS), electrical conductivity was measured using a conductivity meter, TDS and TSS were determined using the gravimetric method, temperature was measured using a thermometer, and pH was measured using a pH meter. From the research results, the highest pH value was obtained at 7.8, the highest temperature value was 33 ℃, the highest electrical conductivity value was 163.6 µS/cm and the highest TSS value was 22.6 mg/L. The average values of pH, temperature, electrical conductivity and TSS obtained did not exceed the quality standard limits based on Minister of the Environment Regulation Number 51 of 2004. The highest TDS value obtained was 3821 mg/L and did not exceed the quality standard limits based on Republic of Indonesia Government Regulation Number 82 of 2001. The concentration values of the heavy metals Pb, Cd, and Cu on the coast of the Sungai Pisang did not exceed the quality standard limits based on Minister of Environment Regulation Number 51 of 2004. From the research results it can be concluded that the sea water on the coast of the Sungai Pisang not polluted.
Identifikasi Bidang Gelincir Zona Rawan Longsor di Kawasan Wisata Puncak Taruko Kabupaten Agam Menggunakan Metode Geolistrik Resistivitas Fauzana, Husnatul; Namigo, Elistia Liza
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.644-650.2024

Abstract

A research has been conducted to identify the surface of rupture plane in Puncak Taruko area, Agam Regency, West Sumatra Province using 2-dimensional resistivity geoelectric method of Wenner-Schlumberger Configuration. Data collection was carried out on three tracks with track lengths of 80, 100 and 100 m and 5 m electrode spacing. The research area is a plateau with a slope of up to 40º which is directly adjacent to the very steep cliffs of Sianok Canyon with a cliff height of 30-100m. Data processing was carried out using Res2dinv software to display a 2-dimensional image of the subsurface layer structure based on the resistivity values measured in the field. In the cross section of the mapping results in the three tracks, 4 rock layers were identified, namely clay, sand, tuff and granite. The interpretation results show that the sliding plane on each track is tuff. For Track 1 with a depth of 3,75-15,9m, for track 2 it is 5,15-19,8 m and a depth of 6,38-19,8 m for track 3. Based on the interpretation of 2D image results, the area of track 1 and 2 has a translational avalanche type and the area of track 3 has a rotational avalanche type. Based on the depth and thickness of the slide field, the greatest risk of landslide is on track 3.
Pembuatan dan Karakterisasi Bolus Berbahan Silicone Rubber RTV 00A dengan Variasi Komposisi Clear Catalyst Fajriani, Dewi; Muttaqin H.S, Afdhal; Ilyas, Muhammad
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.704-710.2024

Abstract

The manufacture and characterization of boluses made from Silicone Rubber RTV 00A with 4% clear catalyst composition have been carried out. The bolus was made with a size of (15x15) cm and the thickness of 1.0 cm. Each bolus sample was characterized to obtain physical properties (density and water absorption capacity), mechanical properties (tensile strength, strain, and elastic modulus), Relative Electron Density (RED), Percentage Surface Dose (PSD), and absorbed dose. RED value were obtained through tomographic images using a CT-Simulator by determining 5 Region of Interest (ROI) points. PSD and absorbed dose values were measured using a plan parallel chamber detector with energy of 9 MeV. The bolus has a density of (0.815 ± 0.150) g/cm³ and water absorption of (12.42 ± 0.01)%, tensile strength of (0.286 ± 0.091) MPa, an elongation of (22.93 ± 0.22)%, and an elastic modulus of (5.880 ± 11.52) MPa. The RED value of (1.114 ± 0.021) g/cm³ a PSD of 132.40% and an absorbed dose of 233.82 cGy in energy of 9 MeV. RTV 00A can be developed as a bolus base material.
Peningkatan Kualitas Citra Radiograf Panoramik Menggunakan Metode Filter Laplacian Haq, Haritsul; Oktamuliani, Sri; Putri, Wulandani Liza; Gunawan, Gunawan; Adnan, Surma
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.624-629.2024

Abstract

Image quality enhancement of panoramic radiographs using the Laplacian filter method has been carried out. This study aims to improve the quality of panoramic radiography images (Acteon X-Mind Prime 3D) in the radiology installation of RSGM Andalas University. This study used secondary data from 46 panoramic images in .BMP format, which were performed by applying Laplacian filter and evaluating image quality by Structural Similarity Index (SSI), Contrast-to-Noise Ratio (CNR), Contrast Improvement Ratio (CIR) and Spatial Frequency (SF). The results showed that the SSI value was 0.636 ± 0.0732, CNR 5.36 ± 0.412, CIR 0.740 ± 0.124, SF 0.605 ± 0.0983. These results mean that CNR shows good image contrast, SSI shows dissimilarity between the original image and the image after Laplacian filter processing, CIR shows good contrast improvement, while the SF value of 0.749 indicates that the image's ability to display structural details is still lacking. Skewness and Shapiro-Wilk tests indicate that SSI and SF are abnormally distributed, while CIR and CNR are normally distributed. T-test analysis was performed on the CIR and CNR metrics data, which showed that the significance of this study indicated that the Laplacian filter method was significant p < 0.001. Thus, the use of the Laplacian filter method significantly improves the image quality of panoramic radiographs.
Penerapan Metode Short Time Fourier Transform (STFT) dalam Menentukan Frekuensi Dasar Alat Musik Talempong Minangkabau Hernanda, Fachri; Yusfi, Meqorry
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.677-683.2024

Abstract

At this research has determined the fundamental frequency of talempong musical instruments using the Short Time Fourier Transform (STFT) method. The research is divided into three stages, namely recording dataset retrieval, method implementation and base frequency analysis. In this research, sound recordings of talempong are collected into a dataset which is divided into several frequencies and then synthesized using the STFT methods then synthesized using the STFT method to determine the frequency of the talempong sound signal to determine the frequency of the talempong sound signal. The frequency value from the STFT process is then compared with the general base frequency to determine the percentage of accuracy of the talempong sound synthesis. From this research, the results obtained average error value of 4,39% and an accuracy percentage of 95,61%.
Analisis Pengaruh Variasi Elektrolit H2SO4, KOH, dan Na2SO4 terhadap Kinerja Elektrokimia Superkapasitor berbasis Biomassa Kulit Kakao Rajagukguk, Exaudi Pratama; Nasution, Widi Mulia; Muldarisnur, Mulda; Yetri, Yuli
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.610-616.2024

Abstract

Utilization of cocoa pod waste (Theobroma cacao) as a supercapacitor carbon electrode through electrolyte optimisation was successfully conducted with 0.5M KOH chemical activator. Carbon production starts with slicing cocoa pods, sun drying, pre-carbonisation, crushing of carbon particles with mortar and ball milling, and particle size uniformity using a sieve. The obtained particle powder was chemically activated with 0.5M KOH, coin-molded into of carbon monolith and finished with integrated pyrolysis. Samples were subjected to one-stage integrated pyrolysis by carbonisation from room temperature to 600˚ C in an N2 gas environment, followed by physical activation to 700˚ C in a CO2 gas environment. Testing the electrochemical properties of carbon electrodes based on different types of electrolytes (H2SO4, KOH, and Na2SO4) IM using cyclic voltammetry (CV) and galvanostatic charge discharge (GCD) methods. The sample provided with H2SO4 electrolyte was confirmed to have the highest specific capacitance of 412.94 F/g at a current of 1 A/g. Based on the results of this study, it is confirmed that cocoa pods have the potential to be a source of electrode base material with H2SO4 electrolyte solution as a source of charge carrier in supercapacitor cell devices.
Analisis Deformasi di Lampung dan Selat Sunda Berdasarkan Data GNSS tahun 2018 hingga 2021 Anggara, Ongky; Rahadianto, Muhammad Ario Eko; Alif, Satrio Muhammad; Isnaini, Een Lujainatul
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.637-643.2024

Abstract

The Lampung Province and Sunda Strait have a seismic gap zone with the potential for major earthquakes in the future. This study analyzes the deformation occurring in this region using continuous Global Navigation Satellite System (GNSS) station data from Indonesia Continuously Operating Reference Station (InaCORS) and Sumatran GPS Array (SuGAr) from 2018 to 2021.5. The GNSS data was processed using the Bernese 5.2 scientific software, applying least squares for velocity changes and statistical tests to analyze significance. The data processing was carried out in two schemes: the first scheme covering 2018-2020, and the second covering 2019-2021. The results of the deformation analysis from 2018 to 2021, using two continuous GNSS data processing schemes, showed velocity changes relative to the Sundaland Plate ranging from ~2 mm/year to ~20 mm/year. In the eastern region of the Sumatra fault, the velocity changes were smaller, around ~5 mm/year, due to the minimal influence of tectonic activity. However, in the Sunda Strait region, the deformation was influenced by volcanic activity. The deformation occurring in Lampung Province and the Sunda Strait, based on GNSS velocity changes, significantly contributes to tectonic and volcanic activities.

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