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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 14 Documents
 1   2 
Search results for , issue "Vol 14 No 2 (2025)" : 14 Documents clear
Identifikasi Batuan Reservoir Panas Bumi di Daerah Tambang Sawah, Lebong Provinsi Bengkulu Menggunakan Data Gravitasi Satelit GGMPlus dengan Inversi 2D Hardianza, Meno; Hadi, Arif Ismul; Hilmi Zakarya
Jurnal Fisika Unand Vol 14 No 2 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.2.177-183.2025

Abstract

The Tambang Sawah geothermal field located in Lebong Regency, Bengkulu Province, is one of the geothermal energy potentials in Indonesia. The area is associated with tectonic activity in the bukit barisan mountain range which is indicated by the appearance of hot springs and fumaroles. This research uses Global Gravity Model (GGM) gravity data, in the form of Free Air Anomaly (FAA) data with a resolution of 220 metres and shuttle radar topography mission (SRTM2Gravity) as contemporary terrain correction data in the form of full scale gravity data. The FAA data was then subtracted from the full scale gravity data to obtain the complete Bouger anomaly (CBA). The CBA was subjected to spectrum analysis to determine the depth estimate and then separated to obtain regional and residual anomalies using the moving average method. There are three distribution patterns of anomaly distribution, namely low, medium and high. The results showed that on the CBA map, areas with moderate anomalies were thought to have geothermal reservoirs with densities < 2.53 g/cm3 different depths.
Prototipe Sistem Kontrol dan Monitor Tanaman Hidroponik pada Sayuran Pakcoy Berbasis Internet of Things Muhammad Fadlil; Firmawati, Nini
Jurnal Fisika Unand Vol 14 No 2 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.2.191-197.2025

Abstract

A prototype of hydroponic plant control and monitoring system for pakcoy vegetables using NodeMCU ESP8266 with notification via Telegram has been produced. This system can facilitate farmers to monitor and control hydroponic plants remotely with parameters of plant height, pH, water level of hydroponic plants. The prototype is designed using 2 HC-SR04 ultrasonic sensors, pH sensors, servo motors, NodeMCU ESP8266, and telegram applications using the Internet of Things (IoT). Tests were carried out by observing pakcoy plants for 28 days after seeding. The measurement results displayed via telegram found that the percentage error of plant height, water pH, and water level are 1.88%, 1.38%, and 6.81%, respectively, and the water tap can function when the water level on the plant is less than 5 cm.  Based on the results obtained, this system can work well.
Identifikasi Segmen Talamau Menggunakan Kombinasi Data Satelit GGMPlus dan Koreksi SRTM2gravity Berdasarkan Analisis Second Vertical Derivative (SVD) Khairunnisa, Widya Indah; Pohan, Ahmad Fauzi
Jurnal Fisika Unand Vol 14 No 2 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.2.198-204.2025

Abstract

The existence of the Talamau segment was only identified by the BMKG after the earthquake that occurred on Friday morning 25 February 2022 in Talamau District, West Pasaman Regency. This earthquake had a magnitude of 6.1 Mw with 201 aftershocks. This research aims to determine the characteristics of the fault types of the Talamau segment using the gravity method. The gravity method can describe subsurface geological structures based on differences in rock density known as gravity anomalies. Gravity data is taken from satellite gravity data in the form of GGMplus data and SRTM2gravity topography data. The resulting gravity anomaly value can be used to determine the characteristics of the fault type using Second Vertical Derivative (SVD) analysis. The combination of GGMplus and SRTM2gravity data provides results that can describe the existence of the Talamau segment based on differences in rock density contrast. The existence of the Talamau segment is in a moderate anomalous pattern with the constituent components namely alluvium rock, gravel sand, silt, Talamau mountain rock, inseparable volcanic rock, intrusive rock, and Kuantan formation rock. From the SVD analysis, the characteristics of the fault type of the Talamau segment are also obtained, namely strike-slip faults.  
Analisis Pengaruh Penggunaan Physical Wedge Filter pada Dose Profile dan Percentage Depth Dose Pesawat Radioterapi Clinax-Cx di Rumah Sakit Universitas Andalas Alhafiz, Mohammad Randy; Adrial, Rico
Jurnal Fisika Unand Vol 14 No 2 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.2.184-190.2025

Abstract

A study has been conducted on the effect of using a physical wedge filter on the dose profile and Percentage Depth Dose (PDD) of the CLINAC-CX teletherapy device at Andalas University Hospital. This study aims to determine the shape of the dose profile and PDD curves formed from the use of physical wedges. Measurements were made with variations in photon beam energy (6 MV and 10 MV) and variations in the angle of the physical wedge filter (15°, 30°, 45°, and 60°). Data processing begins by calculating incomplete data from the LINAC using interpolation techniques. The data is then displayed in the form of a curve or graph using Microsoft Excel. The results of the PDD curve measurement showed no significant difference in the curve formed using or without a wedge. The resulting zmax did not differ much from each other, where for a 6 MV beam without a wedge it was 13.8 mm while the average wedge variation was 14.72 mm. The 10 MV beam variation showed a value of 23.4 mm and an average of 24 mm. The dose profile formed is influenced by the use of wedge, the comparison of the smallest and largest symmetry, flatness, and penumbra values. The smallest values ​​at 6 MV irradiation without wedge are respectively 2.1%, 3.1%, 7.1 mm, and 7.3 mm, while the largest with a wedge angle of 60°, 32.4%, 58.3%, 15.8 mm. The wedge factor between 6 MV and 10 MV shows no difference.

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