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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 16 Documents
 1   2 
Search results for , issue "Vol 14 No 6 (2025)" : 16 Documents clear
Pendugaan Zona Alterasi Hidrotermal Menggunakan Data Geomagnetik EMM 2017 Di Wilayah Lubuk Sikaping Nanda, Fauzan Surya; Budiman, Arif
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.623-629.2025

Abstract

This study aims to identify hydrothermal alteration zones in Lubuk Sikaping District, Pasaman Regency, West Sumatra, using Enhanced Magnetic Model (EMM) 2017 geomagnetic data developed by the National Oceanic and Atmospheric Administration (NOAA). The data processing stages include International Geomagnetic Referee Field (IGRF) correction, evaluation of regional and residual anomalies using Radial Average Power Spectrum (RAPS), reduction to the poles, analysis of magnetic anomaly values ​​with the geological conditions of the study area. The results show that residual magnetic anomalies are in the range of -7.09582 nT to 7.65333 nT. The results of the analysis of magnetic anomaly values ​​and geological conditions indicate that the high anomaly zone (3.12460 nT - 7.65333 nT) spread in the south and southwest is a mineralization zone. The moderate anomaly zone (0.07503 nT - 3.12460) spread in the central to northeast is a lithology preservation zone between magnetic igneous rocks and non-magnetic sedimentary rocks. The low anomaly zone (–7.09582 nT - 0.07503 nT) located in the north and northeast is a hydrothermal alteration zone. The presence of mineralization zones, lithology boundary zones and hydrothermal alteration zones indicates that there is a fluid migration path in this area. The hydrothermal alteration zone in Lubuk Sikaping District is associated with the Sarik-Gajah Formation which consists of volcanic rocks that have undergone alteration due to the presence of active structures of the Sumatran Fault System.
Nanoemulsi Campuran Minyak Flower Musk dan Minyak Atsiri Lili Menggunakan Surfaktan PEG 40 Hydrogenated Castor Oil dan Uji Stabilitas Ukurannya Angelita, Flora; Saragih, Horasdia
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.595-605.2025

Abstract

The use of alcohol-based perfumes often causes skin irritation, prompting the development of water-based perfumes. However, the challenge is that essential oils, the main ingredient in perfumes, are hydrophobic. Nanoemulsion technology offers a solution to this problem. Perfume ingredients are formulated in nanometer sizes, then encapsulated with a surfactant so that they can be dispersed homogeneously in water. This study aims to develop a nanoemulsion mixture of flower musk oil and lily essential oil as a water-based perfume and test its stability. Stability is measured by average diameter, standard deviation, and zeta potential. The nanoemulsion is made using PEG-40 HCO surfactant with the atomization technique. Stability was tested by measuring the average diameter and standard deviation on day 0 and after 120 days of storage. In addition, heating tests were conducted at temperatures of 35°C, 40°C, and 45°C. The results showed that after 120 days of storage, there was an increase in the average diameter and a widening of the size distribution. This was due to the Ostwald ripening phenomenon, whereby smaller nanoemulsion molecules diffused and merged with larger ones. The zeta potential of the nanoemulsion was low (-6.6 to -8.1 mV), which was insufficient to prevent instability. However, when the nanoemulsion was heated, its average diameter decreased. Thermal restructuring occurs in the molecules that make up the nanoemulsion and the PEG-40 HCO molecules that encapsulate the nanoemulsion.
Implementasi Smart Irrigation System berbasis Komunikasi ESP-NOW dan Alternate Wetting and Drying (AWD) di Sawah Area Sumatera Selatan Azzahra, Ayu Kirani; Huwaida, Junita Insyirah Nur; Ariani, Menik; Adnan, Assaidah
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.606-613.2025

Abstract

A Smart Irrigation System has been designed and implemented utilizing the Alternate Wetting and Drying (AWD) method and ultrasonic sensors to assist farmers in monitoring and maintaining the water level in rice fields to ensure it is at the level required by rice plants. This system sends a WhatsApp notification if the water level exceeds 15 cm above ground level. The ultrasonic sensor calibration results show an R2 value of 1.0, indicating that the sensor has met the linearity standard. Laboratory testing was conducted by varying three water conditions: below ground level 15 cm; exactly 15 cm above ground level; or more than 15 cm from ground level. Communication between the sender and receiver uses the ESP-NOW protocol. The results show that the sender successfully instructs the solenoid valve to open the tap when the water level is below 15 cm so that water can flow and close it again when the water level reaches 15 cm. There is a 7-second delay when the solenoid opens due to the Normally Closed (NC) type which requires high voltage and current. When the water level exceeds 15 cm above ground level, the system successfully sends a notification to the farmer (user) to drain the water from the field. Field tests in rice fields showed that the water level measurement of 25 cm was in accordance with the reference measuring instrument and successfully provided an accurate warning for farmers to turn on the pump so that the water level returned to the ideal status.
Peningkatan Akurasi Interpretasi Aliran Darah pada Citra Color Doppler Echocardiography (CDE) dengan Metode De-Aliasing Yohanda, Shindy; Oktamuliani, Sri
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.644-652.2025

Abstract

Color Doppler Echocardiography (CDE) is an echocardiographic imaging technique that utilizes the Doppler effect principle to produce images of the heart. However, CDE images often contain aliasing artifacts that can hinder the interpretation of blood flow. This study aims to eliminate aliasing in CDE images of the apical 4-chamber view through the application of a de-aliasing method using MATLAB R2016b, and to evaluate the performance of this method in improving the accuracy of blood flow interpretation across all cardiac structures. The de-aliasing method corrects folded velocity values by extending the Nyquist velocity range. The results show that the maximum velocity value increased after the de-aliasing process, indicating that the Nyquist velocity range was successfully expanded. Furthermore, the method effectively reconstructed the folded velocity values back into a valid range. Visual errors in the form of color inversion were corrected by adjusting the color scheme of the image. Evaluation of the de-aliasing method’s performance demonstrated an improvement in the accuracy of blood flow interpretation throughout the cardiac structures.
Karakterisasi Kuat Impak dan Densitas Komposit Hibrid Polipropilena - Pati Singkong dan Serat Pinang - Serat Eceng Gondok Mahyudin, Alimin; Hanovatias, Yazid Reza
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.630-634.2025

Abstract

The impact strength and density characterization of hybrid composites with polypropylene - cassava starch matrix using areca nut fiber and water hyacinth fiber has been carried out. The purpose of this study is to obtain superior and environmentally friendly hybrid composites. The ratio of areca nut fiber and water hyacinth is 1:1 while the matrix composition is polypropylene, sorbitol and cassava starch is varied with a ratio of 8:1:1. The percentage of fiber used in each sample is 5%, 10%, 15%, 20% while the percentage of matrix used is 95%, 90%, 85%, 80%. The tests carried out are impact strength and density. Based on the results of the study, the highest impact strength value is 0.0624 J / mm2 found in the 5% fiber volume fraction. The highest density value is 0.844 g / cm2 found in the 5% fiber volume fraction. Therefore, from the research results, it can be concluded that the impact strength value meets the car dashboard standards and the density value obtained is included in the type of particle board with medium density.
Peningkatan Absorpsi Cahaya pada Nanostruktur TiO₂ Terdoping Cu dan Ni untuk Aplikasi Pemisahan Air Fotokatalitik Novianti, Noni; Ramona, Fransischa; Wellia, Diana Vanda; Muldarisnur, Mulda
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.635-643.2025

Abstract

This study reports the enhancement of light absorption by TiO₂ nanoparticles when doped with Ni and Cu nanoparticles. Numerical simulations were performed using the boundary element method. The absorbance in the visible region of Ni-doped TiO₂ increases compared to pure TiO₂. The increase in absorbance is accompanied by a shift in the absorption band edge to a longer wavelength (redshift) due to the formation of new energy levels that narrow the band gap. Cu-doped TiO₂ exhibits a more significant increase in absorbance and a wider absorption range. Both dopants decrease the band gap relative to pure TiO₂, with Cu doping producing a greater decrease. Ni and Cu doping enhance the optical response of TiO₂ in the visible region. Cu doping has the most dominant effect in broadening the absorption and lowering the band gap energy. These findings indicate that Ni- and Cu-based dopant engineering is a potential approach to improve the performance of TiO₂-based materials in photocatalytic applications such as hydrogen production by water splitting.

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