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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 40 Documents
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Search results for , issue "Vol 13 No 4 (2024)" : 40 Documents clear
Rancang Bangun Solar Tracker Otomatis Berbasis Mikrokontroler dan Sensor Serat Optik Sebagai Penerima Intensitas Cahaya Maksimum Syauqi, Farah; Harmadi, Harmadi
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.535-540.2024

Abstract

Solar cell is a device that converts light energy into electrical energy by an effective photovoltaic process. The electrical energy generated by solar cells depends on the intensity of the sun received. The maximum efficiency of solar cells is obtained if it is always perpendicular to the sun, so it is necessary to move the solar cell to follow the movement of the sun. An automatic solar tracker design has been made using fiber optic sensors in this study. The solar tracker design consists of a solar cell and a fiber optic sensor as a sunlight detector consisting of FD-620-10 step-index multimode optical fiber and OPT101 photodetector. The tool that has been made is tested by detecting the voltage, current strength, and power generated by the solar tracker. Solar trackers can produce an average electrical power of 73.79% more optimal than using static solar cells. Based on the results of research, the tool that has been designed can increase the electrical energy generated and store it in accumulators or batteries. 
Analisis Hubungan Ketinggian Planetary Boundary Layer (PBL) dengan Surface Flux di Makassar dan Sekitarnya Lestari, Juliana Tri; Sujiono, Eko Hadi; Arsyad, Muhammad
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.459-468.2024

Abstract

Planetary Boundary Layer (PBL) is influenced by the processes of transfer of momentum, energy, and materials between tPBL and surface layer. Surface fluxes variables consist of Sensible heat flux (SHF) and Latent heat flux (LHF), these variables are also used to measure transport level in this process. Madden Julian Oscillation also contribute in the PBL condition. Therefore, this study was aimed to describe the SHF/LHF and PBL profiles during strong and weak Madden-Julian Oscillation (MJO) periods around Makassar area and its relationship. PBL height was obtained by using the Bulk Richardson Number (Rib) method and bulk aerodynamic for SHF/LHF. Then correlation analysis was done between these two variables. SHF in both strong and weak MJO at 12.00 UTC have greater value than 00.00 UTC, while LHF showed the opposite. PBL height tends to be higher at 00.00 UTC than 12.00 UTC, with the average values were between549,9 to 690,5 m. Annual mean of PBL height ranged between 470 to 1100 m. Maximum average PBL occurred during the transition season I (MAM) at 00.00 UTC, while the minimum happened during transition season 2 (SON) at 12.00 UTC. However, the PBL height profile had shown weak correlation to SHF/LHF value during both MJO strong and weak in Makassar Area.
Pengaruh Persentase Fly Ash terhadap Sifat Fisik dan Mekanik Papan Beton Ringan dengan Filler Serat Sabut Pinang Aulia, Hana; Mahyudin, Alimin
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.452-458.2024

Abstract

Research has been conducted on the effect of fly ash percentage towards physical and mechanical characteristics of lightweight concrete board with coir fiber as a filler. The study was aim to determine the effect of fly ash percentage with areca fiber as a filler on the physical and mechanical properties of lightweight concrete boards. The percentages of fly ash were 0%; 5%; 10%; 15%; and 20% respectively. The size of areca fiber was 0.2%, and the length of the fiber was 1 cm. Samples with 5 cm x 5 cm x 1 cm were used to measure density, porosity, and compressive strength, while samples with 20 cm x 5 cm x 1 cm were used for flexural strength testing. The lightweight concrete board was tested after 28 days. Compressive and flexural strength testing were conducted using a universal testing machine (UTM). Based on the results, the lowest density value was obtained at 20% fly ash content which was 1.06 g/cm3, while the lowest porosity value was obtained at 0% fly ash content which was 26.53%. The density values obtained from the research results were inversely related to the porosity values. The highest compressive strength of lightweight concrete boards without fly ash was achieved, with a value of 36.93 kg/cm2. The highest compressive strength value with fly ash was 30.20 kg/cm2 at 10% fly ash content. The highest flexural strength was 25.5 kg/cm2 at 20% fly ash content. The higher the fly ash content used, the greater the flexural strength value. The density and flexural strength values have met the SNI 03-2105-2006 and SNI 03-2104-1991 standards, but the porosity and compressive strength have not yet fulfilled the SNI standards.
Pengembangan Prototipe Alat Pengukur Medan Magnet Menggunakan Sensor Magnetik 49E Nur, Rechan Zahrotun; Aminah, Nina Siti; Aimon, Akfiny Hasdi
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.573-578.2024

Abstract

The magnetic field is an interesting physical phenomenon and found in everyday life. Many currents technological developments are applications of the magnetic field concept, such as electronics, electric motors, fast trains, and others. In this research, a prototype for measuring magnetic fields was developed with a physics instrumentation system. This prototype can be used for experimental measurements of magnetic fields for physics lecture in the school. It was found that a magnetic field measurement tool could be made using a physics instrumentation system. So, this tool can be used as an experimental medium for measuring the magnitude of the magnetic field in permanent magnet and wires carrying electric current. The prototype was consisted a 49E magnetic sensor. It is hoped that the prototype can replace the Gaussmeter or Teslameter which are relatively expensive. The prototype magnetic field measuring instrument was calibrated by comparing the magnetic field strength measured by the 49E sensor with the Lutron GU-3001 Gaussmeter. Measurements are observed at the centre of the object and parallel to the position of the measuring instrument. The results of the measurements show that the average magnetic field strength on the Gaussmeter and 49E sensor is 246.7 μT and 487.3 μT for permanent magnet and 51.2 μT and 96.9 μT for coiled wires.
Karakteristik Koefisien Absorpsi Bunyi dan Impedansi Panel Akustik dari Styrofoam Menggunakan Metode Tabung Khairunisa, Zahwa; Elvaswer, Elvaswer
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.518-524.2024

Abstract

Research has been carried out regarding the sound absorption coefficient and impedance values of acoustic panels made from Styrofoam material, which aims to overcome sound noise. This research uses the impedance tube method, an acoustic material made from Styrofoam. Acoustic material samples are made from Styrofoam and have various shapes plain, non-perforated, perforated, serrated, ribbed, and hollow. The frequency ranges used in this research are 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz, and 8000 Hz. The results of the study show that the highest sound absorption coefficient value is in the sample with a through hole with a hole diameter of 0.8 cm and a depth of 1.8 cm at a frequency of 1000 Hz, namely 0.99 and the lowest sound absorption coefficient value is at a frequency of 8000 Hz,0.78 in the sample Plain. The highest acoustic impedance value was obtained at a frequency of 1000 Hz, namely 4.16 dyne.s/cm5 with a sample with a through hole. This is influenced by the diameter of the hole and the depth on the surface of the Styrofoam. Styrofoam material can be used as a sound-absorbing material based on the sound absorption coefficient and acoustic panel impedance values. 
Pemodelan Anomali Magnetik Untuk Identifikasi Struktur Bawah Permukaan Bumi Di Nagari Cupak Kabupaten Solok Furqan, Ahmad; Pujiastuti, Dwi; Puryanti, Dwi; Putra, Ardian
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.476-482.2024

Abstract

This research was conducted to determine the distribution of magnetic anomalies in the geothermal area of Nagari Cupak, Solok Regency using geomagnetic methods. Data was collected using a magnetometer at 144 observation points with a distance of 300 m between points. The magnetic anomaly value is obtained from the correction of daily variation’s total magnetic data and correction to the magnetic field value of the 13th generation IGRF (International Geomagnetic Reference Field) reference model. Furthermore, reduction to the poles and continuation upwards with a height of 200 m are carried out to remove noise and separate local and regional magnetic anomalies. After data processing, the total magnetic anomaly value in the area ranges from 1252.8 nT to 2969.4 nT which is categorized as low. The low anomaly value is thought to be caused by the demagnetization of rocks due to the influence of geothermal sources in the subsurface. Furthermore, 2D modeling is carried out by analyzing the magnetic anomaly data and making a cross-sectional incision of the model on the contour of the magnetic field anomaly that has been processed above. Based on the modeling results, the subsurface geothermal system of Nagari Cupak, Solok Regency, consists of a cover rock layer, reservoir layer, and hot rock layer which is suspected to be the heat source of the geothermal system of the study area.
Analisis Deformasi di sekitar Sesar Cimandiri Akibat Gempa Cianjur 2022 Menggunakan Data Indonesia Continuously Operating Reference Station Sandi, Fery Kurnia; Pujiastuti, Dwi; Marzuki, Marzuki; Friska, Vira
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.504-510.2024

Abstract

The preseismic and coseismic deformation due to the 21st November Cianjur Earthquake with a magnitude of 5.6 Mw has been analyzed. This study uses Global Navigation Satellite Station (GNSS) data and 13 Indonesian Continuously Operating Reference Station (InaCORS) daily displacement data to reveal the source of the 21 November 2022 Cianjur earthquake. The InaCORS stations used include BAKO, CANG, CBTU, CJKT, CJUR, CLBG, CLDO, CPTN, CPWK, CROL, CSUM, and CUMI. This research uses GLOBK/GAMIT software and is interpreted in a deformation map. From the data processing results, the deformation pattern of station shifts in the pre-earthquake phase indicates that the movement of the Cimandiri Fault did not cause the 21 November 2022 Cianjur earthquake but was likely caused by a new fault. This is indicated by the difference between the deformation direction of the InaCORS station close to the epicenter and the direction of the Cimandiri Fault movement. The most significant horizontal coseismic deformation was obtained at 43.86 mm at CJUR station, with deformation towards the southeast. The most significant vertical coseismic deformation (uplift) was obtained at 25.9 mm at the CLDO station. 
Penentuan Aktivitas Spesifik Radionuklida dan Estimasi Laju Dosis Efektif Radiasi Gamma di Kawasan Wisata Bukit Nobita Kota Padang Hasanah.Kr, Nurul; Milvita, Dian; Wahyudi, Wahyudi; Hidayat, Maulidia
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.469-475.2024

Abstract

Research has been carried out on determining the specific activity of radionuclides 226Ra (Radium), 232Th (Thorium), 40K (Kalium), and 137Cs (Cesium) in soil, water, and plant samples using a gamma spectrometer in the Bukit Nobita Tourism Area Padang City. This study shows the effective dose rate of gamma radiation received by tourists, tour managers, and farmers. Prepared soil, water, and plant samples were then measured using a gamma spectrometer. Gamma radiation dose rates were calculated 1 meter above the ground at 19 locations. The results showed that radionuclide 226Ra was only detected in soil samples, while radionuclides 232Th and 40K were detected in all samples except water samples. Radionuclide 137Cs were not detected in all samples. The specific activity of radionuclides is still below the threshold recommended by PERKA BAPETEN No.16 of 2013, which is 1000 Bq/kg for 226Ra and 232Th and 10000 Bq/kg for 40K. The specific activity of 137Cs radionuclide is still below the threshold recommended by PERKA BAPETEN No.16 of 2012, which is 100 Bq/kg. The effective dose rate received by tourist visitors, tour managers, and farmers is still below the threshold recommended by BAPETEN, which is one mSv/year.
Sistem Monitoring Suhu dan Kadar Air pada Mesin Pengering Padi Berbasis Internet of Things Syaifurrahman, Syaifurrahman; Hiendro, Ayong; Aula, Abqori
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.483-489.2024

Abstract

Paddy drying is an activity to remove the excess of water content within paddy to achieve a better rice quality during the grinding process. Farmers often determine water level based on experience, such as biting the rice, if the skin breaks, it means the rice is ready to be grinded. This research examines a monitoring system on a paddy drying machine in order to obtain a higher quality paddy to be made into rice. On the machine, there is a hearing element to raise the temperature of the drying tank. The rise of the temperature of the drying tank must be monitored to maintain that the temperature is always within the pre-determined threshold. The monitoring system uses DHT11 and SEN0308 sensors connected to ESP32 module as data processing center, before being displayed on an LCD indicator or a smart phone. Accuracy Test results for sensors show both sensor readings are above 90%. The temperature and water level data of the paddy during the drying process can be seen live on an LCD indicator or a smart phone as an accurate information.
Indeks Kerentanan Seismik Menggunakan Data Mikrotremor untuk Daerah Perbukitan dan Pemukiman di Bukit Nobita Kota Padang Anjelina, Fani; Pohan, Ahmad Fauzi
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.511-517.2024

Abstract

Research on the seismic vulnerability index on Nobita Hill, Padang City uses the microtremor method. The study was conducted in two areas, namely hilly and residential areas around Nobita Hill. Measurements were carried out using a geophone with three components, a north-south horizontal component, an east-west horizontal component and an up-down vertical component at 7 points in hilly areas and 9 points in residential areas with a recording duration of 30 minutes. The measurement results were then processed using the Horizontal Vertical Spectral Ratio (HVSR) method using Geopsy software and mapped using Surfer 11. The research results show that the Nobita Hill area and the settlements around the hill are not vulnerable to seismicity because both research areas have a small category of seismic vulnerability index. This is characterized by dominant frequency values in the hills ranging from 0.633 - 0.935 Hz, amplification from 0.905 - 1.306, and seismic vulnerability index from 1.234 - 2.622. In residential areas, dominant frequency values were found ranging from 0.645 - 2.983 Hz, amplification from 1.109 - 1.316, and seismic vulnerability index from 0.438 - 1.974. This indicates that both studies are safe in the event of an earthquake. 

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