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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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Montmorillonit K-10 yang Dimodifikasi Ni2+: Sifat Struktur dan Aktivitas Katalitik Admi, Admi; Khoiriah, Dewi Khofifatul; Syukri, Syukri
Jurnal Fisika Unand Vol 13 No 3 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.3.439-444.2024

Abstract

Fokus studi ini adalah mensintesis material berbasis montmorillonit K-10 yang dimodifikasi dengan spesies Ni2+ melalui metoda hidrotermal. Pengaruh aktivasi termal terhadap support montmorillonit K-10 pada proses pertukaran kation untuk menghasilkan katalis heterogen dikarakterisasi dengan x-raydiffraction (XRD) dan x-ray fluoressence (XRF). Analisis XRF sampel menunjukkan bahwa kemampuan pertukaran kation sampel montmorillonit K-10 terhadap Ni2+ berdampak pada peningkatan kandungan nikel pada semua sampel yang dimodifikasi dibandingkan dengan yang tidak dimodifikasi. Analisis XRD terhadap struktur sampel yang dimodifikasi mengungkapkan bahwa struktur dasar clay 2:1 (T:O:T) tahan selama proses pertukaran kation. Kinerja katalis heterogen yang dihasilkan diuji pada reaksi transesterifikasi minyak jelantah dengan metanol untuk produksi FAME (Fatty Acid Methyl ester) (biodisel). Evaluasi uji katalitik menunjukkan bahwa montmorillonit K-10 yang dimodifikasi Ni2+ memberikan peningkatan % rendemen FAME. Hal ini mengindikasikan bahwa material montmorillonit K-10 yang dimodifikasi  Ni2+sebagai katalis heterogen yang berpotensi untuk produksi biodisel.
Pemetaan Zona Rawan Banjir di Kabupaten Luwu Utara Menggunakan Metode Analytic Hierarchy Process (AHP) yang Terintegrasi dalam Sistem Informasi Geografis (SIG) Simangunsong, Tiardo; Subaer, Subaer; Palloan, Pariabti
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.525-534.2024

Abstract

Research has been conducted to map flood-prone zones in North Luwu Regency by considering rainfall parameters, soil type, slope, land use, geology, drainage density, road density distance and elevation. The method used in this research is the Analytical Hierarchy Process (AHP) method integrated with Geographic Information Systems (GIS). The purpose of this research is to determine how much each parameter contributes to flood risk and visualize the results in the form of flood-prone maps. The results in this study show that rainfall has the biggest cause of flood risk at 0.30, followed by slope 0.20, land use 0.13, elevation at 0.12, drainage density 0.09, geology 0.07, soil type 0.05, and distance between roads at 0.04. All parameters that have been analyzed, then weighted overlay into a flood-prone map. The mapping results show that North Luwu Regency has a moderate level of flood risk, with an area coverage of 3.813 km2 or 50,78% of the total area. As for the vulnerable level category, it covers an area of 17,48 km2 or 23,28%, and for the moderately vulnerable zone level category it covers an area of 1.939 km2 or 25,82% of the total area. 
Pengaruh Fraksi Volume Serat Pinang dan Serat Rami Terhadap Sifat Fisis dan Mekanik Komposit Hibrid Sebagai Bahan Dasar Dashboard Mobil Annisa, Hafizha Fitri; Mahyudin, Alimin
Jurnal Fisika Unand Vol 14 No 1 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.1.68-74.2025

Abstract

Research has been conducted on the effect of the volume fraction of jute fiber and areca nut fiber on the physical and mechanical properties of hybrid composites as a base material for car dashboards. This research aims to produce hybrid composites that have mechanical properties that are in accordance with the SNI of car dashboards and are environmentally friendly. The volume fraction of areca fiber and jute fiber is varied with a ratio of 1:1. The method of making samples using the hand lay-up method, which is a method of coating the fibers with the matrix manually. In this study, tensile strength, impact strength, density, and biodegradation tests were conducted. Based on the results of the study, the highest tensile strength value was at a volume fraction of 2% areca nut fiber and 2% jute fiber, namely 20.41 MPa. The highest impact strength value is in the volume fraction of 6% areca nut fiber and 6% jute fiber, which is 0.0206 J/mm^2. The highest density value was found in the volume fraction of 2% areca nut fiber and 2% jute fiber, namely 0.88 g/cm^3. The highest degradation rate was obtained in the volume fraction of 6% areca nut fiber and 6% jute fiber, namely 517%/day. From the research results, the optimum sample composition is in the variation of volume fraction of 2% areca fiber and 2% jute fiber.
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.
Pengaruh Filter Lowpass Terhadap Kualitas Citra CT-Scan Paru-Paru Ulga, Sofhia; Muttaqin, Afdhal; Fitriyani, Dian
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.587-593.2024

Abstract

A low pass filter can be employed to enhance the quality of lung CT-Scan images by smoothing sharp transitions and reducing noise present in the images. The aim of this research is to implement a low pass filter by applying different weight values. The kernel weights applied in filtering using a low pass filter are 1/6, 1/9, 1/10, and 1/16. This study is a quantitative research employing 102 images. The findings of this study reveal that applying low pass filters with different kernel weights yields varying image qualities. Based on the quality tests of Mean Squared Error (MSE) and Peak Signal to Noise Ratio (PSNR), it was found that the kernel weight of 1/6 produces images with excellent quality at 17,65%, good quality at 28,93%, and fair quality at 53,92%. Meanwhile, with a kernel weight of the 1/9, 36,36% of the images were found to have good quality, while 64% exhibited lower quality. The application of a low pass filter with a kernel weight of 1/10 resulted in 39% of the images being of good quality and 61% of the images being of lower quality. At the kernel weight of 1/16, 2% of the images were obtained with excellent quality, 40% with good quality, and 58% with lower quality. Based on the MSE and PSNR test values, it was found that applying a kernel weight of 1/6 resulted in better image quality compared to applying other kernel weights. From the overall result, it was found that the application of a low pass filter was not suitable for improving the quality of CT-Scan images of the lung, so other methods could be applied to improve the quality of the images.
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%.
Studi Pengaruh Ketebalan Elektroda Karbon Aktif dari Kulit Buah Kakao terhadap Kinerja Elektrokimia Superkapasitor Dunnas, Irsya; Nasution, Widi Mulia; Muldarisnur, Mulda; Yetri, Yuli
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.594-601.2024

Abstract

Sintesis karbon aktif dari kulit kakao dengan variasi ketebalan elektroda 0,4; 0,5; dan 0,6 mm bertujuan untuk melihat pengaruhnya terhadap kinerja superkapasitor. Tebal elektroda yang berbeda diberi kode sampel yaitu tebal 0,4 mm dengan kode CC-0,4; tebal 0,5 dengan kode CC-0,5 mm dan tebal 0,6 mm dengan kode CC-0,6. Pembuatan elektroda karbon dari kulit kakao dilakukan dalam beberapa tahap yaitu pengeringan organik, prakarbonasi, aktivasi kimia menggunakan aktivator KOH 0,4 M dan pencetakan pelet menggunakan press hidrolik dengan tekanan 8 ton. Pelet yang telah dicetak dikarbonasi menggunakan gas N2 pada suhu 600 ⁰C dan aktivasi fisika menggunakan gas CO2 pada suhu 700 °C. Sifat elektrokimia dari sel superkapasitor ditinjau melalui sistem dua elektroda dalam elektrolit 1 M KOH. elektroda karbon aktif optimum yang diperoleh pada sampel CC-0,5 dengan kapasitansi spesifik yang tinggi  mencapai 366,67 F/g pada rapat arus 1,0 A/g. Rapat energi maksimum yang didapatkan sebesar 660 Wh/Kg pada rapat daya optimum 2378,39 W/Kg. Potensi kulit kakao sebagai sumber karbon aktif dengan ketebalan 0,5 mm menunjukan kinerja perangkat penyimpanan energi elektrokimia superkapasitor yang tinggi dan stabil dengan ketahanan bahan yang baik.
Sistem Fotobioreaktor dilengkapi Pemantauan Konsentrasi CO2 dari Kabut Asap pada Model Kebakaran Lahan Gambut Zhuhrii, Azzahra; Harmadi, Harmadi
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.827-833.2024

Abstract

Indonesia's peatlands are quite extensive and often cause fires that lead to haze. Haze contains harmful compounds, namely carbon dioxide (CO2). One of the efforts to reduce CO2 content is using a microalgae Chlorella vulgaris photobioreactor system. This research makes a photobioreactor system equipped with monitoring the concentration of CO2 emissions from haze on a peatland fire model. The photobioreactor is equipped with an MQ-135 sensor to detect CO2 concentration and an LM35 sensor to determine changes in temperature in the microalgae container. The temperature in the microalgae container is set in the range of 25ºC30ºC according to the habitat of microalgae. The output data from the sensors is processed by Arduino Uno R3. The measurement results of CO2 concentration and temperature are displayed on the I2C LCD in units of ppm and ºC. This study uses a variety of light sources in the form of red, green, blue LEDs and sunlight. The results of the study found that blue LED lights play a more active role to increase the ability of microalgae to reduce CO2 emissions in the room. The photobioreactor system using Chlorella vulgaris microalgae is able to reduce the concentration of CO2 produced from haze in the peatland fire model of 655.08 ppm down to 620.47 ppm within 1 hour.

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