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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 4 (2025)" : 15 Documents clear
Alat Ukur Kadar Air Biji-bijian Secara Mobile Berbasis Internet Of Things Sebagai Indikator Kualitas Komoditas Barang Dagang Zidane Walid, Kholiq; Firmawati, Nini
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.325-331.2025

Abstract

Research has been conducted on a mobile IoT-based moisture content measuring device as an indicator of the quality of cocoa beans, yellow coffee, and robusta coffee. Moisture content is extremely important in maintaining the quality of beans because it directly affects their quality, taste, aroma, shelf life, and safety for consumption. This device uses a Capacitive Soil Moisture Sensor to detect moisture content by measuring changes in capacitance caused by dielectric changes. The moisture measuring device consists of a Capacitive Soil Moisture Sensor as the moisture sensor, an ESP32 as the data processor, an LCD to display the moisture content percentage, an LED as an indicator of high moisture levels, and a Smartphone as a measurement database through Blynk. The device was tested by measuring the moisture content of three types of grain samples: cocoa beans, yellow coffee, and robusta coffee. Each sample consisted of 10 variations of moisture content measured using a comparison tool, the Cerra Tester. The average measurement error percentages were found to be 3.02% for yellow coffee, 3.12% for cocoa beans, and 3.35% for robusta coffee. From the researchresults, the designed tool is as expected and works well.
Green Synthsis dan Karakterisasi Nanopartikel Tembaga dengan Ekstrak Daun Gambir (Uncaria Gambir Roxb) untuk DYE Sensitized Solar Cell Wargiyana, Sarah; Mardiansyah, Dedi; Puryanti, Dwi
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.319-324.2025

Abstract

Research has been conducted on Green Synthesis of copper nanoparticles using gambir leaf extract (Uncaria gambir Roxb) for Dye Sensitized Solar Cell. This study aims to determine the effect of the comparison of molar ratio variations (Cu(NO₃)₂) with gambir leaf extract through green synthesis of copper nanoparticles and I-V test of DSSC produced from copper nanoparticles through green synthesis. Sample preparation was carried out using the green synthesis method with the ratio of gambier leaf extract to (Cu(NO₃)₂) in sample variations of 1:1, 1:2, 1:3, 1:4 and 1:5. Copper nanoparticles were characterized using UV-Vis spectroscopy to determine the absorbance value and energy band gap and DSSC measured using a simple I-V test. UV-Vis spectrophotometer results on copper nanoparticles showed absorbance peaks in the 377 nm - 396 nm wavelength range, and obtained energy band gap values ranging from 2.84-2.91 eV. The resulting copper nanoparticles are round to elongated, due to the phenomenon of aggregation between particles. The efficiency obtained from DDSC is 4.26% and the FF value is 0.56.
Implementasi Nilai Exposure Index dan Indeks Massa Tubuh dalam Pemilihan Parameter Sistem Automatic Exposure Control Pada Radiografi Toraks (Studi Kasus Pada Rumah Sakit Universitas Andalas) Yulma Susanto, Riyan; Adrial, Rico; Milvita, Dian; Oktavia, Amel
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.339-345.2025

Abstract

This study aims to analyze the application of EI (Exposure Index) values to evaluate exposure indications in thorax PA examinations. It also examines the influence of patient BMI (Body Mass Index) on parameter selection, such as estimated body size in the AEC (Automatic Exposure Control) system. Data collection was conducted on patients aged 15-73 years undergoing thorax PA examinations using the AEC system. The data collected included patient mass (kg), height (m), selected estimated body size on the AEC system, exposure factor values (source voltage (kV)), and EI values. The method used to evaluate the implementation of EI values involved comparing the EI values from the examinations with the vendor-recommended EI values for CR (Computed Radiography) to determine the resulting exposure indications. Furthermore, the influence of BMI on parameter selection in the AEC system was analyzed using a simple linear correlation test to determine the correlation between BMI values and the resulting EI values. The study results showed that thorax PA examinations using the AEC system produced optimal exposure indications in 57% of cases and underexposure indications in 43% of cases. Causes of underexposure indications included the selection of exposure factors that were not fully adjusted to the patient's physical condition based on BMI values, delay time processing on the imaging plate, and the use of collimation fields exceeding diagnostic needs in some examinations. BMI values showed a significant correlation with EI values.
Visualisasi Sebaran Air Tanah Berdasarkan Nilai Resistivitas Dengan Konfigurasi Wenner – Schlumberger Di Desa Air Rami Kabupaten Mukomuko Sakti, Ridho Eka; Sendiya Verentina; Suhendra; Refrizon; Gayatriani, Intan
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.353-359.2025

Abstract

Research has been conducted on groundwater potential in Air Rami Village, Mukomuko Regency, Bengkulu Province. The research was conducted because Air Rami Village lacks the availability of water from groundwater and often experiences failures in making boreholes, so this research aims to identify and determine the distribution of groundwater in the aquifer layer. In this study using 2D resistivity geoelectric method with wenner-schlumberger configuration that can identify the distribution of groundwater based on resistivity value. Groundwater distribution based on rock resistivity value so that it can be interpreted as an area potentially containing groundwater originating from aquifers. The 2D geoelectric data acquisition used the geoelectric MAE X612 – EM VHR Multi-Channel resistivitymeter with 48 electrodes. Data processing to determine the distribution of groundwater and subsurface rock conditions using Res2Dinv software version 3.71 which produces 2D resistivity cross sections of the earth's subsurface with resistivity values between 3.40 - 21.90 Ω.m. The resistivity value is interpreted as groundwater. Aquifers that store a lot of groundwater are located at positions 240 - 280 m from the starting point of measurement which has a depth of between 20 - 65 m.
Analisis Pengaruh Prisma Akresi dan Patahan Splay terhadap Deformasi Permukaan akibat Gempa Mentawai 2010 melalui Pemodelan Numerik 3D Kuncoro, Alvina Kusumadewi; Srigutomo, Wahyu; Fauzi, Umar
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.346-352.2025

Abstract

The Southern Mentawai Segment is located in the Sumatra Subduction Zone, which is part of the accretionary wedge. The accretionary wedge is the most complex tectonic structure in the world within its material and geometrical structure. The 2010 South Mentawai earthquake, with magnitude Mw~7.8, was accompanied by a tsunami that was larger than expected for its magnitude, classifying it as a tsunami earthquake. This study analyze the effect of the accretionary wedge and faults in the South Mentawai Segment on surface deformation using 3D finite element modeling. The geometric model was constructed in four configurations: a model without an accretionary wedge, a model without an accretionary wedge but with splay fault, a model with an accretionary wedge, and a model with both accretionary wedge and splay fault. The results indicate that the model with the accretionary wedge aligns better to the data observed at GPS stations, particularly for the vertical deformation. The presence of splay faults in the model increases the vertical deformation by up to twice, both for the model with and without the accretionary wedge. A better understanding of the subsurface structure enables more precise identification of areas with potential earthquake-triggered tsunamis and more accurate surface deformation estimation.
Three-Dimensional Subsurface Structural Modeling of a Geothermal Prospect in Banda-Neira, Central Maluku, Based on GGMPlus Gravity Data Nafian, Muhammad; Fahmi, Muhammad; Rahma, Farah Aliya; Suciarty A H, Vionna
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.360-367.2025

Abstract

The Banda Island is located at the convergence of three major tectonic plates: the Indo-Australian Plate, the Eurasian Plate, and the Pacific Plate. Banda Neira Island holds significant geothermal potential that can be utilized as an energy resource. Therefore, this study was conducted to investigate the subsurface structure of the geothermal prospect area using the gravity method. In the gravity data processing, derivative analysis results indicate that the Banda Neira geothermal prospect is controlled by multiple fault systems: faults associated with the collapse of the older Banda Neira caldera, as well as local faults confirmed to be reverse faults. In the 3D modeling results, a geothermal reservoir layer is identified with an estimated density of 1.67–1.77 g/cm³, interpreted as a mixture of tuff and minor lava. The reservoir is predominantly water-filled, inferred from its relatively low density, and is located at depths of approximately 150–700 meters. In the second slicing profile, oriented north-south, a cap rock layer is observed at depths of 0–300 meters from the measurement point, with a density of 1.67–1.77 g/cm³, overlying a volcanic reservoir layer found at 200–700 meters depth, with higher densities ranging from 3.57–3.67 g/cm³.
Sintesis Kristalin Selulosa Berbahan Limbah Pelepah Pisang Rahmawati, Ayu; Faidah, Lutfatin; Ramadhan Yogaswara, Rachmad
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.332-338.2025

Abstract

Nanocrystalline cellulose (CNC) was successfully synthesized from banana sheath waste and demonstrated promising potential for applications in biocomposites, sustainable materials, and biomedical fields. This study aimed to produce CNC through an environmentally friendly chemical process while investigating the effects of bleaching temperature and acid concentration on CNC yield and properties, in accordance with ISO/TS 20477:2017. The process involved delignification using 17% NaOH at 100°C for 1.5 hours to remove lignin, followed by bleaching with 10% H₂O₂ for 1.5 hours at various temperatures (70°C–90°C) to enhance cellulose purity. Acid hydrolysis using H₂SO₄ at concentrations of 10%–30% was conducted at 45°C for 40 minutes to break down amorphous regions and form nanocrystalline structures. Chesson-Datta analysis revealed cellulose, hemicellulose, and lignin contents of 80.32%, 5.257%, and 3.26%, respectively. Optimal conditions were found at 80°C bleaching temperature and 10% acid concentration, yielding 2.5606 g of CNC. SEM-EDX analysis showed smooth fibrous morphology with 63.55% carbon and 35.83% oxygen content, while XRD analysis indicated particle sizes ranging from 8.76 to 24.12 nm, with an average of 14.25 nm.
Pengaruh Geometri dan Polarisasi Cahaya terhadap Resonansi Plasmon Nanopartikel Ellipsoid Core-Shell SiO₂@Ag dan SiO₂@Au Novianti, Noni; Syaibah, Abi; Maulidan, Ikhwan Fikri; Muldarisnur, Mulda
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.379-386.2025

Abstract

This study reports the optical behaviors of SiO₂@Ag and SiO₂@Au core-shell ellipsoidal nanoparticles in terms of polarization of light and geometrical parameter changes. The particles showed two strong modes of resonances, longitudinal and transversal, which could be controlled by rotating the polarization of incident light by 90° and thus could find applications as sensor and optical switch devices. While the resonant wavelength is independent of polarization direction, while maximum extinction values indicate pronounced changes. SiO₂@Ag nanoparticle exhibit higher maximum extinction as well as the peak of resonance at a shorter wavelength than SiO₂@Au. Furthermore, an increase in the ratio of core diameter to shell induces a blue-shift and increasing extinction value. The overall particle size has no influence on the location of the peak of the resonance but increases the extinction intensity. The larger ratio of short axis to long axis also brings about blue-shift in longitudinal resonances. The finding demonstrates that core-shell structure control and morphology control can be used to engineer nanoparticle optical performance in diverse nanophotonic applications.
Identifikasi Kualitas Udara di Sekitar PLTU Teluk Sepang, Kota Bengkulu Verojenases, Fascal; Angeli Silaban; Samuel Christian Alfredo Banjarnahor; Irkhos; Lizalidiawati
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.368-378.2025

Abstract

PLTU Teluk Sepang uses coal as the main fuel and has the potential to reduce air quality in the vicinity. This study aims to identify the air quality around PLTU Teluk Sepang and its impact on the environment and public health. The data used are PM2,5, PM10, CO, and CO2 at seven location points in June and July 2024. The method in this research is quantitative and descriptive, quantitative is used to compare the measurement results with the threshold set by the government, while descriptive is used to visualize the data in the form of graphs and distribution maps. The results showed that PM2,5 and PM10 levels at several points exceeded the specified thresholds, especially near the PLTU and traffic road areas, which fell into the “Unhealthy.” category. CO levels are still within safe limits, while CO2levels are in the polluted air category, and the increase in pollutants at night indicates a significant impact of PLTU activities on air quality. This study shows that the air quality around Teluk Sepang PLTU is in a polluted condition, so mitigation measures are needed to control air pollution for public health and the environment.
Analisis Korelasi Nilai Entrance Surface Air Kerma (ESAK) Terhadap Massa Tubuh, Usia, dan Faktor Eksposi pada Pasien Pemeriksaan Radiografi Umum di RSUP Dr. M. Djamil Padang Putri, Rahmiatul; Milvita, Dian; Pratama, Ida Bagus Gede Putra
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.413-420.2025

Abstract

Research on the correlation analysis of Entrance Surface Air Kerma (ESAK) values ​​on body mass, age and exposure factors in general radiography examination patients was carried out at RSUP Dr. M. Djamil Padang. Data collection was carried out on adult patients with body mass (50-70) kg and age over 15 years on examination of the abdomen, thorax and lumbar spine for 3 months with a total of 1,113 patients. The method used to determine correlation is simple linear correlation test analysis. The results of the study showed that the ESAK value had a fairly strong correlation with the patient's body mass with an rxy value = 0.25-0.4 except for the lumbar spine examination. The ESAK value has a fairly strong to strong correlation with the exposure factor (kV) with a value of rxy = 0.27-0.6 and has a strong to very strong correlation with the exposure factor (mAs) as indicated with a value of rxy = 0.45 -0.9, but has a very weak correlation with patient age with a value of rxy = 0.02-0.1 except for lateral thorax examination.

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