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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 28 Documents
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Search results for , issue "Vol 13 No 6 (2024)" : 28 Documents clear
Rancang Bangun Sistem Pemantauan Dosis Radiasi Sinar Gamma di Bawah Permukaan Air Menggunakan Pencacah Geiger-Muller Secara Nirkabel Berbasis Labview Adhitya Firmansyah; Meqorry Yusfi; Mohamad Nur Yahya
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.806-812.2024

Abstract

Utilization of various radioactive sources in Indonesia, including nuclear fuel, nuclear waste, and radioactive minerals, has significantly increased to support research, industry, and healthcare services. This usage necessitates an evaluation of environmental impacts, particularly the increase in background radiation in the context of radioecology. Radionuclides like cesium, which are highly soluble in water, can be released into marine waters through leaks from nuclear power plants, radioactive waste, and military weapons tests, potentially harming marine ecosystems and the food chain. Therefore, periodic monitoring of underwater radiation exposure is crucial. This study aims to develop a gamma-ray radiation dose monitoring system underwater using a wireless Geiger-muller counter and LabVIEW-based interface. The system comprises a Geiger-muller counter for measuring radiation doses, an nRF24l01+ module for data transmission, and a LabVIEW application as the display panel. Testing was conducted by submerging a radioactive cesium source into a water tank with varying distances and depths. Radiation data were measured by the Geiger-muller counter, transmitted via the nRF24l01+ to the receiver, processed by Arduino Uno, and displayed in LabVIEW. The LabVIEW application also provides alerts if the dose exceeds the threshold and records the dose values. Test results showed the lowest measurement success rate of 17% at position 7 and the highest of 30% at position 1.
Pemodelan Struktur Bawah Permukaan Kabupaten Rejang Lebong dengan Metode Inversi 3D Data Gravitasi Satelit Menggunakan Koreksi SRTM2gravity Puja Kasmailen Putri; Ahmad Fauzi pohan; Marzuki Marzuki
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.799-805.2024

Abstract

Rejang Lebong is a tourism area in Bengkulu Province, Indonesia, which is located close to the active Ketaun and Musi faults which are segments of the Sumatran Fault System (SFS). This research uses 3-D analysis and modeling of Earth's gravity anomaly inversion data obtained from the high-resolution Global Gravity Model (GGM). The aim of this research is to identify subsurface geological structures such as faults, active volcanoes and sedimentary layers that have the potential to pose a danger to the Curup Rejang Lebong tourism area. The Complete Bouguer Anomaly (CBA) in the study area was calculated using modern terrain correction methods that utilize full-scale topographic gravity data from the SRTM2gravity model. Separating regional and residual anomalies using an upward continuity filter with a height of 10 km. The 3D inversion model of satellite gravity data has succeeded in modeling the subsurface of the Rejang Lebong district where the presence of the Mount Kaba magma chamber is characterized by low negative density contrast, and the Ketaun and Musi fault lines are characterized by low and high contrast boundaries which have the potential to cause natural disasters in the region. Analysis of gravity anomalies and rock density contrasts provided results that are in line with the regional geological conditions of the Bengkulu region, including the pattern of intrusion of igneous rocks with high density contrasts and sedimentary rocks with lower density contrasts.
Analisis Parameter Seismisitas a-Value dan b-Value serta Percepatan Tanah Maksimum (PGA) Sebelum dan Sesudah Gempa Ambon 2019 Menggunakan Metode Probabilistic Seismic Hazard Analysis (PSHA) Indah Putri Utami; Dwi Pujiastuti
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.813-819.2024

Abstract

Probabilistic Seismic Hazard Analysis (PSHA) is a method to estimate earthquake risk in a region by considering uncertainties in earthquake sources and local ground response. To estimate earthquake risk and seismic impacts in a region, an in-depth analysis of seismicity parameters, such as a-value and b-value, as well as maximum ground acceleration (PGA), is required. This study aims to analyze changes in seismicity parameters, particularly b-value (rock fragility) and a-value (seismicity index) in the Maluku region before and after the 2019 Ambon earthquake. This study also aims to see whether there are changes in Peak Ground Acceleration (PGA) values for the Maluku region after the 2019 Ambon Earthquake. The seismic data used in this study comes from the USGS catalogue recorded from 2000 to 2022. The results of this study show that the b-Value of the Maluku region as a whole before the earthquake was 1.15 and decreased to 0.91 after the 2019 Ambon earthquake. However, the a-Value and b-Value for each seismic source zone increased. In addition, the PGA value for the Maluku region is 1.25g. These results provide the conclusion that the Maluku region is included in the zone with medium seismic hazard with the level of earthquake damage included in category VI of the MMI scale.
Sintesis Karbon Aktif Dari Batang Jagung(Zea mays L.) dengan Metoda Dehidrasi Asam Untuk Aplikasi Elektroda Superkapasitor Olly Norita Tetra; Syukri Syukri; Adlis Santoni; Deswati Deswati; Nabiel Fajarandi; Emriadi Emriadi
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.834-842.2024

Abstract

Activated carbon from corn stalks (Zea mays L.) has been successfully synthesized by the dehydration method and used as a supercapacitor electrode. Corn stalk powder was dehydrated with 1 MH2SO4 and activated with 5 M NaOH at a carbon and activator mass ratio of 1:4 with a heating temperature of 800°C and an N2 gas heating rate of 10°C/minute for 1 hour. SEM characterization results show that heterogeneous pores have formed on the surface of corn stalk-activated carbon. EDX results showed a carbon percentage of 54.82%; this data is supported by FTIR results, which show several functional groups containing C and O atoms on the surface of activated carbon. Based on desorption adsorption isotherm analysis, the activated carbon shows H4 type with a specific surface area of 117.973m2/g, average pore diameter of 1.730 nm and total pore volume of 0.1021 cm3/g. Measurement of the electrochemical properties of corn stalk activated carbon with a three-electrode system and 3 M KOH electrolyte showed a specific capacitance value of 133.9 F/g, power density 225.2 W/kg and energy density 0.863 Wh/kg. The synthesis of activated carbon through the dehydration method offers advantages in terms of simplicity in preparation, low cost, shorter synthesis time and being environmentally friendly.
Rancang Bangun Alat Ukur Kadar Air dan Keasaman untuk Mengetahui Kualitas Madu Berbasis Mikrokontroler Saputra, Taufik; Firmawati, Nini
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.749-755.2024

Abstract

Honey is a naturally sweet substance produced by honeybees from the nectar of flowers. The composition of honey is so complex that the benefits of honey in the pharmaceutical, food, beverage and aesthetic industries are enormous. One of the quality parameters of honey is the level of moisture and acidity. This research aims to analyse the quality of honey based on moisture content and acidity. To test this, a tool is needed that can detect moisture content and acidity in honey. The design of a tool to measure moisture content and acidity to determine the quality of honey using capacitive soil moisture sensor and pH sensor has been made. The testing of the tool is done with 3 variations of honey samples available in the market. The test results of 3 honey samples with the designed tool were compared with the pH meter and Brix refractometer. The percentage error obtained in testing the designed tool is 12.5% for moisture content and 3.89% for acidity. Based on the research results, it is found that the designed tool can read the value of water content and acidity in each honey sample.
Sistem Fotobioreaktor dilengkapi Pemantauan Konsentrasi CO2 dari Kabut Asap pada Model Kebakaran Lahan Gambut Zhuhrii, Azzahra; Harmadi, Harmadi
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.827-833.2024

Abstract

Indonesia's peatlands are quite extensive and often cause fires that lead to haze. Haze contains harmful compounds, namely carbon dioxide (CO2). One of the efforts to reduce CO2 content is using a microalgae Chlorella vulgaris photobioreactor system. This research makes a photobioreactor system equipped with monitoring the concentration of CO2 emissions from haze on a peatland fire model. The photobioreactor is equipped with an MQ-135 sensor to detect CO2 concentration and an LM35 sensor to determine changes in temperature in the microalgae container. The temperature in the microalgae container is set in the range of 25ºC30ºC according to the habitat of microalgae. The output data from the sensors is processed by Arduino Uno R3. The measurement results of CO2 concentration and temperature are displayed on the I2C LCD in units of ppm and ºC. This study uses a variety of light sources in the form of red, green, blue LEDs and sunlight. The results of the study found that blue LED lights play a more active role to increase the ability of microalgae to reduce CO2 emissions in the room. The photobioreactor system using Chlorella vulgaris microalgae is able to reduce the concentration of CO2 produced from haze in the peatland fire model of 655.08 ppm down to 620.47 ppm within 1 hour.
Sifat Adsorptif dan Termodinamika Ekstrak Lignin dari Pelepah Nipah (Nypa fruticans Wurmb) untuk Korosi Baja Lunak dalam Medium HCl Sartika, Hilda; Emriadi; Stiadi, Yeni; Suryati, Suryati
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.784-791.2024

Abstract

Research on the adsorptive and thermodynamic properties of lignin extract from Nipah fronds (Nypa fruticans Wurmb) for mild steel corrosion in hydrochloric acid medium has been conducted. The inhibititon effect of lignin extract from Nipah (Nypa fruticans Wurmb) fronds (LENF) on the corrosion of mild steel in HCl solution was studied by weight loss and optical microscopy methods. The results show that LENF was a good inhibitor in 1.0 M HCl, and the inhibition efficiency increases with increasing concentration of the extract and temperature. Inhibitive effect was afforded by the adsorption of the extract on the steel surface, which was found to accord with Langmuir adsorption isotherm. Adsorption and activation parameters such as activation energy (Ea), enthalpy (∆Η), free Gibbs energy (∆G), and entropy (∆S) were evaluated on the corrosion and inhibition process.
MODEL FOREST CANOPY DENSITY PADA CITRA SPOT-6 UNTUK ESTIMASI POTENSI TEGAKAN POHON DI KAWASAN PENGELOLAAN HUTAN LINDUNG BATU SERAMPOK LAMPUNG SELATAN Atmojo, Aulia; Triyani, Retno; Irwansyah Fauzi, Adam; Ulin Nuha, Muhammad; Ramadhini, Meraty; Rohman, Arif
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.771-783.2024

Abstract

Traditional forest inventory methods for obtaining tree stand data in the Batu Serampok Protected Forest Management Unit (KPHL) require significant time and resources. Therefore, remote sensing technology was employed to estimate the potential tree stand density. This study utilized the Forest Canopy Density (FCD) model and the Normalized Difference Vegetation Index (NDVI) from SPOT-6 satellite imagery to assess forest density. Field surveys were conducted to validate the image processing results. Statistical analysis, including correlation and linear regression tests, was performed. Forest density classes were converted into the number of trees per unit area using regression equations. Accuracy tests compared field data with estimated tree stand counts based on vegetation indices. The FCD correlation score was 0.85, higher than NDVI's 0.78, with linear regression results of 0.73 for FCD and 0.62 for NDVI. FCD demonstrated higher maximum accuracy (90.52%) compared to NDVI (84.08%), making it the preferred method for estimating tree stand potential. Overall, FCD reconstruction proved more accurate than NDVI, with the Batu Serampok KPHL predominantly characterized by moderate-density stands.
Analisis Perubahan Garis Pantai Pulau Enggano Bengkulu Utara Menggunakan Aplikasi Digital Shoreline Analysis System (DSAS) Gunawan, Nur Aini; Ekawita, Riska; Supiyati, Supiyati; Anjasman, Anjasman
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.756-761.2024

Abstract

The coastline is the boundary between the land surface and the sea surface that can change every year. Enggano Island is one of the areas experiencing very rapid coastal changes. This research aims to identify changes in the coastline of Enggano Island over the past 5 years and determine the maximum and minimum changes in abrasion and accretion. The data processing results show that over the past 5 years, the coastline in three villages on Enggano Island has changed overall, with abrasion of 91.01 meters and accretion of 348.08 meters. Due to the wave height on Enggano Island, these three villages have experienced sedimentation (land addition) and changes in the coastline caused by accretion being greater than abrasion. For instance, in 2020-2021, the sea wave height peaked, causing abrasion. However, the wave height continued to decrease in the following years, causing land erosion each year. From the explanation above, it can be concluded that Enggano Island is experiencing changes in its coastline, which are predominantly caused by accretion events.
Kajian Biofisika FRRS Untuk Mengurangi Nyeri Kelelahan Pada Kaki Dengan Stimulasi Listrik dan Magnet Wardhani, Primasari Cahya; Puspitasari, Nia Dwi; Billah, Zakiyah Dania; Prijo, Tri Anggono; Aryaseta, Bagas; Sakinah, Sakinah; Wulan, Widya Rachma; Munir, Syahrul
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.762-770.2024

Abstract

This research aims to design and test the effectiveness of the Foot Reflection-Relaxation Stimulator (FRRS), which combines electrical and magnetic stimulation as a reflexology therapy method to reduce pain caused by fatigue. FRRS is designed to stimulate reflex points in the feet by applying principles of physics such as static magnetic fields and Lorentz force, which are expected to enhance blood circulation and relax tense muscles. The testing was conducted on 25 healthy male participants who experienced leg fatigue after traveling a distance of 20 km. Pain levels were measured using the Numerical Rating Scale (NRS) before and after treatment with FRRS. The results showed a significant decrease in pain scale, from an average of 7 before treatment to 3.12 after treatment. The use of FRRS has proven effective in reducing pain due to fatigue in the legs, which is believed to be due to increased blood circulation and muscle relaxation. Thus, FRRS can be a practical and efficient solution to improve the quality of life for individuals who often experience fatigue and pain in their legs.

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