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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 15 No 1 (2026)" : 15 Documents clear
Analisis Regangan di Selat Sunda berdasarkan Data GNSS Anggara, Ongky; Alif, Satrio Muhammad; Januarta, Danda Selfa; Maulana, Yoga
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.9-15.2026

Abstract

The Sunda Strait is a complex tectonic transition zone between Sumatra and Java, influenced by the interaction between the Indo-Australian and Sundaland plates. This study aims to analyze interseismic displacement patterns and strain accumulation using continuous Global Navigation Satellite System (GNSS) data observations spread across southern Sumatra, the Sunda Strait, and western Java. The analysis results show that GNSS stations along the west coast of Sumatra experience significant shifts to the northwest at varying speeds, reflecting the direct influence of subduction. Meanwhile, stations in the West Java region show a more uniform shift pattern to the southeast. In the Sunda Strait region, a complex displacement pattern is identified, influenced by a combination of tectonic cessation and volcanic activity, particularly around Mount Anak Krakatau. The results of strain accumulation amounted to ~50 nanostrains per year in the tectonically active region. These findings indicate that the Sunda Strait region has high tectonic activity potential and plays an important role in the release of seismic energy in the future. Therefore, continuous geodetic monitoring is essential to support the understanding of cooling processes and disaster mitigation efforts in this region.
Sistem Kontrol Otomatis Pemberian Larutan Nutrisi untuk Tanaman Kale Pada Metode Pertanian Aeroponik Berbasis Mikrokontroler Ardani, Magfira; Firmawati, Nini; Rasyid, Rahmat
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.34-40.2026

Abstract

Innovation in agricultural cultivation methods continues to be developed to improve production yields, one of which is the aeroponic system that enables plants to grow without soil media. This study designs and implements a prototype of an automatic control system for nutrient solution delivery in kale cultivation using an aeroponic method. The system is equipped with a DHT22 sensor for temperature and humidity monitoring, a TDS sensor for nutrient concentration measurement, and a JSN-SR04T sensor for solution level detection. The actuators include a fan cooler, a DC water pump, and two mini DC pumps, all operating automatically based on sensor data. The fan cooler is activated at temperatures above 26 °C, the mist nozzle sprays the solution when humidity drops below 88% or periodically every 10 minutes, while the mini DC pumps maintain the nutrient concentration and solution level within optimal ranges. Testing was conducted over 29 days with data recorded at 07:15, 12:00, 16:00, and 20:00. The results show that the system can operate automatically, stably, and effectively in maintaining environmental conditions that support the growth of kale plants in an aeroponic system.
Penerapan Sistem Monitoring Suhu dan Kelembaban Ruangan Berbasis IoT untuk Optimalisasi Pengujian Di Laboratorium Riset UPT Laboratorium Sentral Universitas Andalas Apriani, Akmecia Risqa; Margani, Taufik Try; Muldarisnur, Mulda
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.41-48.2026

Abstract

The quality of laboratory test results is strongly influenced by temperature and humidity conditions, therefore monitoring these parameters is essential to ensure compliance with ISO/IEC 17025:2017 standards. This study aims to develop an Internet of Things (IoT)-based temperature and humidity monitoring system accessible via the Adafruit IO platform. The system is designed using a DHT22 sensor for temperature and humidity detection, with data processing carried out by the ESP32 microcontroller, which transmits the information in realtime to Adafruit IO. The experimental results indicate that the system performs reliably in recording laboratory room conditions, with an average measurement error of 1.873% for temperature and 3.743% for humidity, while the overall accuracy reached 98,127% for temperature and 96,257% for humidity. furthermore, the ESP32 successfully transmitted data to the Adafruit IO dashboard and activated the LED and buzzer as warning indicators when the measured values exceeded the predefined thresholds.
Stabilitas Ukuran Nanoemulsi Parfum Campuran Minyak Atsiri Black Musk dan Lili yang Dienkapsulasi dengan Polimer Tween 80 Ginting, Endru Saperlin Lawren; Saragih, Horasdia
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.24-33.2026

Abstract

In this study, a perfume mixture of black musk and lily essential oils was nanoemulsified using a tween 80 polymer encapsulator and dispersed in water to produce a water-based perfume. Water was used as a base to replace alcohol, which often causes side effects on the skin. Its size stability was tested, both as a result of storage time and as a result of heating. The purpose of this study was to produce a water-based perfume from a nanoemulsion mixture of black musk and lily essential oils, and to test its size stability. Nanoemulsion was carried out using an atomization technique. The results showed that the average diameter and standard deviation of the nanoemulsion changed after being stored for 120 days and when heated to a temperature of 45oC. The size change during storage was mainly caused by the very small zeta potential, which did not produce sufficient electrostatic repulsion between the nanoemulsions to prevent Ostwald ripening and coalition. The size change due to heating, in addition to the above, was also caused by the increasing kinetic energy of the tween 80 polymer molecules on the surface of the nanoemulsion, which caused a reorganization (solidification) of its structure. Thus, the stability of the size of the nanoemulsion perfume mixture of black musk and lily essential oils produced in this study was greatly influenced by storage time and heating temperature.
Evaluasi Hubungan Deviasi dan Energi terhadap Kestabilan Keluaran Berkas Elektron pada Pesawat LINAC Varian TrueBeam Sakinah; Wardhani, Primasari Cahya; Arie Chintya Martania; Nur Aini Fauziyah; Wahyu Dwi Lestari
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.1-8.2026

Abstract

This study aims to analyze the relationship between electron beam energy and electric charge, as well as the relationship between deviation and energy, to evaluate the output stability of the LINAC machine. Measurements were conducted at BPAFK Surabaya using a Varian TrueBeam LINAC at Hospital X, East Java. The study employed electron energies of 6 MeV, 9 MeV, 12 MeV, 16 MeV, and 18 MeV. The procedure included filling the water phantom with distilled water, setting the source-to-surface distance (SSD) to 100 cm with a radiation field size of 10 cm × 10 cm, and connecting the detector to the electrometer outside the LINAC room. Calibration was performed at the reference depth (Zref) based on the R₅₀ value from the Percentage Depth Dose (PDD) table according to the IAEA TRS-398 standard. Measurements were repeated five times with voltage variations of +300 V, −300 V, and +75 V. The results showed that the maximum electric charge occurred at 12 MeV at a depth of 2.96 cm, while the highest deviation, −0.15%, was observed at 16 MeV—still within the ±2% tolerance limit. Therefore, the LINAC machine is considered stable and suitable for use in radiotherapy.
Sistem Pendeteksi Hama Wereng pada Tanaman Padi Menggunakan Sensor ADXL335 Berbasis Gelombang Radio dan Light Trap H., Junita Insyirah N.; Azzahra, Ayu Kirani; Ariani, Menik; Koriyanti, Erry; Hayati, Ari; Saleh, Khairul; Adnan, Assaidah
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.16-23.2026

Abstract

One of the strategies issues that determines the success of a rice crop is how to eradicate pests without using chemicals. Conventional pest control generally uses pesticides that can cause pest resistance, increase production costs, and risk environmental pollution. This study proposes an early detection system for planthopper pests based on the ADXL335 accelerometer sensor to detect vibrations or abnormal movements in rice stalks. Vibration data detected by the ADXL335 is processed together with wind speed data from the Anemometer Sensor to distinguish between vibrations caused by pests and vibrations from wind gusts. If a pest anomaly is detected, the system will automatically activate a Light Trap to physically capture the pests. Furthermore, real-time notifications are also sent to farmers via radio waves via the Telegram short message service. This system is expected to reduce dependence on pesticides, save costs, and support the government's agenda of modernizing agriculture to maintain national food security.
Aplikasi Metode Geolistrik Resistivitas untuk Menentukan Zona Lemah (Studi Kasus: Wilayah Episenter Gempabumi di Kecamatan Lalolae, Kabupaten Kolaka Timur) Triani, T.; Sudarwin Kamur; Erfina, Erfina
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.49-56.2026

Abstract

Research was conducted on the weak zones at the epicenter of the earthquake in Lalolae District, East Kolaka Regency, utilizing the Wenner 2D resistivity geophysical method. This study involved five measurement lines, each 150 meters in length, with a spacing of 10 meters between electrodes. The data analysis revealed that resistivity values across each line were heterogeneous, ranging from low to high resistivity at varying depths. Low resistivity (<100 Ωm), indicated in blue, corresponds to sandy alluvium resulting from the weathering of schistose rocks, which are classified as weak zones. Medium resistivity (>100 Ωm) is situated above the low resistivity layer and transitions into the high resistivity layer across each measurement traverse, identified as gneiss rock. High resistivity (>200 Ωm) extends along the measurement path at varying depths and is classified as quartzite rock.
Verification of Photon Beam Absorbed Dose Using the Tissue Phantom Ratio Parameter on the Linac Clinac Cx at Andalas University Hospital Nisa Oktania, Nisa; Milvita, Dian; Adrial, Rico; Diyona, Fiqi
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.103-109.2026

Abstract

Research on verification of the radiation dose of a 6 MV and 10 MV photon beam on Clinac CX type Linear Accelerator (LINAC) has been conducted at Andalas University Hospital. This research aims to determine the radiation beam correction factor to obtain measured dose values and obtain the value of absorbed dose verification value based on the Technical Report Series (TRS) No. 398 International Atomic Energy Agency (IAEA). The research began with planning on the CT-simulator. Furthermore, the measurement of radiation dose on the phantom slab using a Clinac CX type LINAC therapy aircraft with a farmer chamber ionization detector, target depth variations of 1,5 cm, 2,5 cm, and 10 cm, and field area variations of (6×6) cm2, (10×10) cm2, (15×15) cm2, (8×13,3) cm2, dan (9×11,5) cm2. Furthermore, radiation dose verification is carried out by comparing the radiation dose at the TPS to the dose measured using the farmer chamber ionization detector. The absorbed dose value obtained based on the planning dose at the TPS increased at maximum depth and decreased as the depth of the irradiation field increased. Verification of the radiation dose that meets the tolerance limit is below 5%. The appropriate measurement results were obtained at a maximum depth (Dmax) of 2,5 cm, except at depths of 1,5 cm and 10 cm.
Klasifikasi Multi-Kelas Kanker Paru Berbasis Ekstraksi Fitur Hibrida GLCM, LBP dan Gabor Filter Menggunakan Algoritma Random Forest dan KNN pada Citra CT-Scan Iqbal, Muhammad; Pandji Triadyaksa; Qidir Maulana Binu Soesanto
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.57-69.2026

Abstract

This study aims to improve the multi-class classification performance of Non-Small Cell Lung Cancer (NSCLC) based on CT-Scan images through a hybrid feature extraction approach. The method combines Gray Level Co-occurrence Matrix (GLCM), Local Binary Pattern (LBP), and Gabor Filter features, classified using Random Forest and K-Nearest Neighbor (KNN) algorithms. The dataset includes four image classes: adenocarcinoma, large cell carcinoma, squamous cell carcinoma, and normal. Model performance was evaluated using accuracy, sensitivity, specificity, and area under curve (AUC) metrics. The results show that the GLCM+LBP feature combination with the Random Forest algorithm achieved the best performance with an accuracy of 99.22%. The model effectively recognizes both global and local texture variations of lung tissue and remains stable in distinguishing all image classes. It can be concluded that the hybrid texture feature combination and ensemble algorithm produce an accurate, efficient, and potentially applicable classification model for computer-aided diagnosis in medical physics
Verifikasi Dosis Titik pada Perencanaan Pengobatan Radioterapi Teknik IMRT Berdasarkan Kasus Uji C-Shape dan Mock Prostate Standar AAPM TG-119: Indonesia Yuana, Firdy; Khasanah, Kholifatun; Hentihu, Fatimah Kunti
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.94-102.2026

Abstract

Verifikasi dosis titik merupakan tahap krusial dalam Quality Assurance (QA) radioterapi Intensity-Modulated Radiation Therapy (IMRT) yang berfungsi memastikan kesesuaian antara dosis radiasi yang dihitung oleh Treatment Planning System (TPS) dengan dosis yang diterima secara aktual. Penelitian ini bertujuan untuk mengevaluasi deviasi dosis titik dengan menggunakan slab phantom, mengikuti protokol uji standar American Association of Physicists in Medicine Task Group 119 (AAPM TG-119), yaitu C-Shape Test dan Mock Prostate Test. Evaluasi dilakukan dengan memvariasikan dua parameter utama: jumlah arah lapangan penyinaran (5, 7, dan 9 arah) dan lebar segmen (segment width) (5 mm, 7,5 mm, dan 10 mm). Hasil studi menunjukkan bahwa seluruh nilai perbedaan dosis yang diukur pada lokasi target maupun Organ at Risk (OAR) untuk kedua skenario uji berada di bawah batas toleransi klinis 3% yang telah ditetapkan oleh AAPM TG-119. Berdasarkan analisis, konfigurasi perencanaan terbaik untuk Mock Head and Neck Test adalah 7 arah lapangan penyinaran segment width 5 mm dengan ΔD OAR 0,076% dan jumlah MU 978,34, sedangkan untuk Mock Prostate Test adalah 5 arah lapangan penyinaran segment width 5 mm dengan ΔD OAR 0,027% dan jumlah MU 515,27. Hasil ini diharapkan dapat menjadi acuan awal dalam menentukan strategi perencanaan IMRT yang efektif dan efisien dalam praktik klinis.

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