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INDONESIA
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 1,828 Documents
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Analisis Eksperimental Waktu Respons dan Repeatabilitas Sensor Gas CCS811 terhadap Paparan Asap Rokok pada Ruang Uji Terkontrol Billy Sopater Maniani; Akbar Sujiwa; Nailul Hasan
Jurnal Fisika Unand Vol 15 No 3 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.3.260-268.2026

Abstract

This study analyzes the response time and repeatability of a CCS811 gas sensor embedded in a self-developed wearable cigarette-smoke detector. Experiments were carried out in controlled test chambers of  cm and cm using exposures of 1–4 cigarettes, with five repetitions for each condition, yielding 40 experiments. The blue mark was defined as the start of exposure, the yellow mark as the instant when the TVOC reading first reached or exceeded the internal alarm threshold of 65 and the vibration motor was activated, and the red mark as the peak value before the signal decreased. The analyzed parameters were alarm time, peak time, peak eCO2, peak TVOC, standard deviation, and coefficient of variation. The mean alarm time ranged from 35.43 to 91.98 s, while the mean peak time ranged from 76.50 to 139.29 s. The highest peaks were observed for four cigarettes, reaching 6051.4 ppm and 9389.0 ppb in the 20 cm chamber, and 5984.4 ppm and 9234.0 ppb in the 40 cm chamber. Two-way ANOVA indicated that chamber size and cigarette number significantly affected peak eCO2 and peak TVOC (p<0.01), but not response time (p>0.05). These results show that the CCS811 is feasible for trend detection of cigarette smoke exposure in low-cost wearable devices
Luminescent Solar Concentrator (LSC) Berbasis Coumarin Terintegrasi dengan Fotovoltaik sebagai Fasad Bangunan Penghasil Energi Listrik Kerta Adi Wasana; Akbar Sujiwa; Nur Aini Fauziyah
Jurnal Fisika Unand Vol 15 No 3 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.3.253-259.2026

Abstract

The integration of renewable energy systems in buildings offers a promising approach to enhance the sustainable utilization of clean energy. This study presents the development of a renewable energy prototype based on a Luminescent Solar Concentrator (LSC) integrated with photovoltaic modules for building façade applications. The LSC was fabricated using epoxy resin mixed with coumarin, producing samples with dimensions of 100 cm² and 400 cm². Photovoltaic modules were installed along the edges of the LSC to capture guided light and convert it into electrical energy. The prototype was evaluated using a measurement system that continuously records voltage, current, and power output. Experimental testing was conducted from 07:00 to 16:00 (WIB) under direct sunlight to analyze the system response to variations in solar irradiance. The results indicate that the system produces relatively stable voltage output, while the current and power vary depending on the intensity of solar radiation. The maximum voltage, current, and power obtained were 36.1 V, 1.14 mA, and 40.07 mW, respectively. These findings demonstrate the potential of the proposed LSC–photovoltaic prototype as a renewable energy harvesting system for building applications, particularly within the concept of Building Integrated Photovoltaics (BIPV).
Deteksi Gempa Bumi Real-Time Menggunakan Sensor MPU6050 dengan Koreksi Drift Adaptif dan Sistem ESP32 Berbasis IoT Nadila Gusriyani; Maria Evita
Jurnal Fisika Unand Vol 15 No 4 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.4.414-422.2026

Abstract

Indonesia is located in the most seismically active region in the world, creating an urgent need for an affordable earthquake monitoring system. This study presents a real-time earthquake event detection system based on an MPU6050 MEMS (Micro-Electro-Mechanical System) accelerometer with adaptive drift correction integrated with an ESP32 microcontroller and Internet of Things (IoT)-based data transmission. The system acquires three-axis ground acceleration in real time, adaptive bias compensation, drift suppression using zero-velocity update (ZUPT), and event detection based on an adaptive threshold relative to a local noise baseline. Key seismic parameters, including Peak Ground Acceleration (PGA) and Peak Ground Velocity (PGV), are calculated in real time, while frequency domain characterization is performed offline using Fast Fourier Transform (FFT) analysis. Long-term stationary measurements over approximately 60 minutes showed stable noise characteristics, with root mean square (RMS) noise levels of 0.0067 m/s², 0.0039 m/s², and 0.0027 m/s² in the X, Y, and Z axes, respectively. The system demonstrated excellent baseline stability, with a PGA variation of only 0.7% and a measured drift rate of 0.00088 m/s² per hour. Comparative validation against a smartphone-based reference sensor demonstrated a 100% event detection rate, and a PGA estimation error of ±2%, with linearity exceeding a coefficient of determination of 0.99.
Analisis Respons Dosimetri Phantom Berbasis PMMA dengan Variasi Media Air dan Nylon Menggunakan Sumber Cs-147 Berdasarkan Standar ISO 4037 Widya Rachma Wulan; Primasari Cahya Wardhani; Fajar Timur; Wahyu Dwi Lestari; Arie Chintya Martania
Jurnal Fisika Unand Vol 15 No 4 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.4.405-413.2026

Abstract

This study analyzes the dosimetric response of Polymethyl Methacrylate (PMMA)-based phantoms with water and nylon as alternative media for radiation dose measurement.. Cylindrical phantoms resembling human extremities were fabricated using 3D printing according to the ISO 4037 standard. Dose measurements used a Thermoluminescent Dosimeter (TLD) type Hp(10) with a Cesium-137 gamma source (662 keV) at angles of 0°, 40°, and 235°. The results show that the dose in nylon consistently produced higher dose values than water at all angles. The average dose ranged from (31,95–32,20) μGy (absorbed dose) and (31,95–32,20) μSv (equivalent dose), while the nylon medium ranged from. (33,03–33,45) μGy (absorbed dose) and (33,03–33,45) μSv The percentage difference between the two media was in the range of 2,61%–3,88%, which is close to the 5% dosimetry tolerance limit by the IAEA. This variation is influenced by the scattering characteristics of the nylon material, which increase the probability of radiation interaction, particularly Compton scattering. Additionally, standard deviation values indicate that the dose distribution in water is more homogeneous than in nylon. Nevertheless, the consistency of the dose values suggests that nylon possesses good radiological equivalence to water. Therefore, nylon has the potential to be used as an alternative material in dosimetry phantom fabrication, especially in conditions where the use of water is limited. 
Analisis Struktur Bawah Permukaan menggunakan Data Satelit Gravitasi GGMPlus di Pulau Enggano, Bengkulu Utara Provinsi Bengkulu Muhammad Deni Apriyanto; Refrizon Refrizon; Arif Ismul Hadi; Laura Nurul Aprilia Simamora; Siti Herfina Anjani
Jurnal Fisika Unand Vol 15 No 4 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.4.345-354.2026

Abstract

This study aims to identify subsurface structures and rock type in Enggano Island, North Bengkulu, using GGMPlus satellite graity data. The methods applied include the calculation of ABL with SRTM2gravity topographic correction, spectral analysis to estimate anomaly depth, and separation of regional and residual anomalies using the moving average method. Furthermore, two-dimensional modelling was conducted to obtain subsurface density distribution. The results show that the ABL values range from -20 mGal to 80 mGal, with low anomalies dominating the northern part and gradually increasing towards the south. Spectral analysis indicates that the average depth of regional anomalies is approximately 1875.7 m, while residual anomalies are about 123.27 m. The interpretation reveals that the northern area is dominated by low-density rocks, whereas the central to Southern parts are characterized by high-density rocks. The 2D modelling suggest the presence of sedimentary rocks, limestone, and igneous rocks (mafic intrusions), as well as fault structures or basin boundaries in the study area.
Pengaruh Suhu Terhadap pH Larutan Penyangga Dalam Optimasi Kondisi Penyimpanan di Laboratorium: Studi Parameter Uji Akreditasi ISO 17025-2107 Marlia Novita; Firmanul Qadri Amir; Salmiati Salmiati; Yulia Eka Putri
Jurnal Fisika Unand Vol 15 No 3 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Buffer solution have an essential role in ensuring pH measurement accuracy, particularly in laboratories implementing ISO 17025-2017 standards. Temperature fluctuation can cause pH changes that potentially reduce pH meter calibration accuracy and affect the quality of test results,. This study aims to analyze the effect of storage temperature on buffer pH stability and determine the optimal storage conditions,. An experimental design was employed with three storage temperature variations, namely cold (±13°C), room (±25°C), and high (±50°C), applied to pH 4, 7, and 10 buffer solutions,. Measurements were conducted every 24 hours for seven days using a digital pH meter. Data were statistically analyzed to identify significant changes and determine the optimal temperature. The results are expected to provide effective buffer storage recommendations, support chemical management in laboratories, and enhance testing reliability in accordance with ISO 17025:2017 standards.
Rancang Bangun Alat Deteksi Bahan Baku Gelatin Menggunakan Multisensor Gas Berbasis Machine learning Febby Trishe Ananda; Harmadi Harmadi; Wildan Panji Tresna; Aditya Eka Mulyono
Jurnal Fisika Unand Vol 15 No 4 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.4.423-429.2026

Abstract

In The demand for gelatin for halal food ingredients in Indonesia is very high. Pork-based gelatin, which is difficult to identify after undergoing the production process, is still widely used in the food and pharmaceutical industries. Analytical methods such as PCR and FTIR offer high accuracy, but they require high operational costs and specialized laboratory facilities. This study develops a machine learning-based electronic nose (e-nose) system to detect and classify gelatin types based on their raw material sources. This system integrates eight types of gas sensors to detect volatile organic compounds (VOCs) produced by each type of gelatin, which are then classified by PCA and predicted by LDA. The study will use gelatin with raw materials sourced from cows, pigs, and fish with varying gelatin concentrations of 1%, 3%, 5%, and 7%. Testing will be conducted for 30 minutes for each sample. The results of the testing prove that the device is capable of detecting and distinguishing gelatin based on its raw materials with a detection accuracy of 95%.
PERBANDINGAN HASIL SIMULASI SOFTWARE PRIMO DENGAN PENGUKURAN EKSPERIMEN PADA QUALITY ASSURANCE BERKAS FOTON LINEAR ACCELERATOR VARIAN CLINAC CX Wulandari Roelyant; Rico Adrial; Muhammad Arif Efendi
Jurnal Fisika Unand Vol 15 No 4 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.4.430-436.2026

Abstract

This study aims to compare the results of Monte Carlo simulations using PRIMO software with the results of experimental measurements in the QA process of a 6 MV Varian Clinac CX Linear Accelerator (LINAC) photon beam based on the parameters of Percentage Depth Dose (PDD), dose profile, and gamma index. Dose distribution measurements were performed using a water phantom at a Source to Surface Distance (SSD) of 100 cm with field sizes of 4×4 cm², 10×10 cm², and 40×40 cm². Monte Carlo simulations were performed using PRIMO software by modeling the geometry of the Varian Clinac CX LINAC head and water phantom according to the experimental conditions. The simulation and measurement results were analyzed through PDD curves, dose profiles, and quantitative evaluation using the gamma index with a tolerance criterion of 2%/2 mm. The results showed that the simulated PDD curves were in good agreement with the measurement results. The gamma passing rate values obtained were 97.98% for the 4×4 cm² field, 97.43% for the 10×10 cm² field, and 87% for the 40×40 cm² field. The decrease in conformity in large fields is influenced by an increase in the contribution of lateral scattering. The dose profile analysis results show conformity in the central area of the field, while greater differences occur in the penumbra and shallow depths due to steep dose gradients and detector resolution limitations. PRIMO-based Monte Carlo simulation can be relied upon as an independent verification instrument in the routine quality assurance of 6 MV photon beams from the Varian Clinac CX LINAC

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