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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 1,782 Documents
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Penerapan Metode Short Time Fourier Transform (STFT) dalam Menentukan Frekuensi Dasar Alat Musik Talempong Minangkabau Fachri Hernanda; Meqorry Yusfi
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%.
Perbandingan Teknik 3DCRT dan IMRT pada Pasien Kanker Glioblastoma Berdasarkan Treatment Planning System Intan Pratiwi Riani; Winny Rahmadani Papesta; Hanifa Shafira; Rico Adrial; Muhammad Ilyas
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.13.5.617-623.2024

Abstract

Glioblastoma cancer (GBM) is a malignant brain tumour that develops aggressively and has a short life expectancy so it requires appropriate treatment for its treatment. The purpose of this study was to determine a more effective treatment technique in GBM cancer patients by comparing Three Dimension Conformal Radiation Therapy (3D-CRT) and Intensity Modulated Radiation Therapy (IMRT) irradiation techniques based on the parameters of Conformity Index (CI), Homogeneity Index (HI), maximum dose and Normal Tissue Integral Dose (NTID) of healthy tissue, as well as Dose Volume Histogram (DVH) curves obtained from the Treatment Planning System (TPS). This study used 10 GBM cancer patient data using a 6 MV photon beam and a total dose of 60 Gy. The data used are the volume of cancer when 95% of the radiation dose is given, the total volume of cancer, the radiation dose at 2%, 50%, 98%, the average dose and the volume of Organ at Risk (OAR). The results showed that the CI value for 3DCRT technique was 0.87-1.00 and IMRT technique was 0.92-0.98. HI value for 3DCRT technique is 0.02-0.07 and IMRT technique is 0.01-0.05. The percentage of the maximum dose value for the 3D-CRT technique is between 104.72% to 108.95% while the IMRT technique is between 98.40% to 108.60%. The NTID values obtained in both techniques did not exceed the established dose limits and were in accordance with the Radiation Therapy Oncology Group (RTOG) 0825 and 0615. IMRT technique is more effective than 3DCRT technique for GBM cancer patients based on CI, HI and maximum dose values.
Identifikasi Daerah Potensi Longsor Melalui Pengamatan Erosi Berdasarkan Analisis Nilai Suseptibilitas Magnetik Tanah (Studi Kasus: Daerah Tonggo Kanagarian Tigo Koto Silungkang, Kecamatan Palembayan, Kabupaten Agam, Sumatera Barat) Harif Luthfi; Arif Budiman
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.13.5.711-717.2024

Abstract

The research has been conducted to observe soil erosion in potential landslide areas based on soil magnetic susceptibility (MS) analysis in Tonggo Kenagarian Tigo Koto Silungkang area, Palembayan District, Agam Regency, West Sumatra Province. Soil samples were taken from on two slopes, namely Track A and Track B and one reference point. Samples were measured for low frequency MS (χlf) and frequency-dependent MS (χfd). The results showed that χlf and χfd respectively ranged from 183.7 to 435.5 ×10-8 m3kg-1 and 1.2 to 4.6% (Track A), 416.9 to 600.4 ×10-8 m3kg-1 and 0.9 to 2.2% (Track B), and 365.8 to 638.3 ×10-8 m3kg-1 (reference point). The χlf value of sample of each point on Track A is much smaller than the χlf value of sampel of the reference point, while the χlf value of sample of each point on Track B is almost close to the χlf value of sample of the reference point. These results indicate that the slopes of Track A experienced more severe erosion than Track B. The distribution of χlf and χfd values for Track A was relatively straight, whereas for Track B the increase in the χlf value was not followed by an increase in the χfd value. These results indicate that Track A experienced anthropogenic disturbance. The slope of Track A has a greater landslide potential than the slope of Track B.
Perbandingan Koreksi Medan (Terrain Correction) Konvensional dan Modern pada Metode Gravitasi Menggunakan Data DEM ERTM2160 dan SRTM2gravity pada Wilayah Cianjur Afikatul Awaliyah; Ahmad Fauzi Pohan
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.13.5.651-657.2024

Abstract

A study has been conducted to compare the distribution of anomaly values obtained through conventional and modern terrain correction to identify the subsurface structure of the Cianjur region, especially around the location of the Cugenang Fault. The data used are gravity disturbance data equivalent to Free Air Anomaly (FAA) from GGMplus, ERTM2160 DEM data as topographic data, and modern terrain correction data from SRTM2gravity. Data is processed using Microsoft Excel, Oasis Montaj, and Surfer software. Based on the results of the CBA contour map obtained, the application of SRTM2gravity data as a modern terrain correction provides better results so that subsurface structure modeling will provide more accurate results. The CBA contour map produced from modern terrain correction provides clearer topographic results than conventional terrain correction using ERTM2160 DEM topographic data. Furthermore, using SRTM2gravity modern terrain correction data provides clearer rock density contrast results along the active path of the Cugenang Fault.
Analisis Sensitivitas Sensor GY-ML8511 dalam Deteksi Formalin M Farhan Ramadhan; Meqorry Yusfi; Harmadi Harmadi
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.13.5.684-689.2024

Abstract

Food safety is a crucial aspect in meeting people's nutritional needs. Formalin, a dangerous preservative, is often used illegally to extend the shelf life of foodstuffs, posing serious risks to consumer health. This research develops a portable technology for rapid detection of formaldehyde in foodstuffs. The method utilizes the interaction between UV light and the concentration of formaldehyde in a sample treated with Schiff reagent, enabling the measurement of UV uptake proportional to formaldehyde concentration. The Schiff reagent reacts with formalin to produce a colored compound whose absorbance is measured to detect and quantify formalin in the sample. The designed optical system focuses on measuring the intensity of light from a UV LED source, which is then transmitted through the sample. The successfully transmitted light intensity is converted into an electrical signal by the GY-ML8511 sensor, which is then processed by the NodeMCU ESP8266 to display the concentration of formalin on the LCD screen. This research also analyzes the sensitivity and selectivity of the GY-ML8511 sensor to evaluate its performance and reliability in detecting formaldehyde, with the ultimate goal of improving food safety through innovative detection technologies, such as the use of biosensors and advanced spectroscopy. This technology contributes to existing solutions by enabling rapid and accurate detection at various stages of food production, thereby reducing the risk of contamination and improving compliance with food safety standards
Peningkatan Kualitas Citra Radiograf Panoramik Menggunakan Metode Filter Laplacian Haritsul Haq; Sri Oktamuliani; Wulandani Liza Putri; Gunawan Gunawan; Surma Adnan
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.
Rancang Bangun Alat Ukur Tekanan Hidrostatis dan Kedalaman Perairan Berbasis Sensor Serat Optik M Fachri Yunus; Harmadi Harmadi
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.13.5.718-724.2024

Abstract

The design of hydrostatic pressure and water depth measuring instrument based on optical fiber sensor using intrinsic method has been carried out. The design of this hydrostatic pressure and water depth measuring instrument consists of fiber optic sensors which include a light source in the form of a 5V diode laser, FD-620-10 optical fiber as a light transmission medium and OPT101 photodetector. Arduino Uno R3 board as a data processor, and I2C LCD as a viewer of measurement results. Characterization of the fiber optic sensor is done by varying the bending based on the number of serrations that cause differences in output voltage on the fiber optic sensor. Optimal results were obtained when the serrations amounted to 5 with a sensitivity value of -0.0863 V/kPa. The maximum hydrostatic pressure that can be measured is at a water depth of 1.5 m. The measurement results of hydrostatic pressure and water depth obtained with the designed tool against the theory and comparison tool obtained a percentage error of 4.42% and 4.32%, respectively
Analisis Pengaruh Variasi Elektrolit H2SO4, KOH, dan Na2SO4 terhadap Kinerja Elektrokimia Superkapasitor berbasis Biomassa Kulit Kakao Exaudi Pratama Rajagukguk; Widi Mulia Nasution; Mulda Muldarisnur; Yuli Yetri
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.
Identifikasi Pencemaran Air Laut di Pesisir Pantai Sungai Pisang Kota Padang Ditinjau dari Parameter Fisika dan Kimia Muhammad Rinaldi; Dwi Puryanti; Eko Purwanto
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.
Verifikasi Dosis Radiasi Permukaan pada Kasus Kanker Payudara Menggunakan Metode Dosimetri In Vivo Sri Wulandari; Rico Adrial; Syarifatul Ulya; Fiqi Diyona
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.

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