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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 1,782 Documents
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Penentuan Aktivitas Spesifik Radionuklida Alam Sumber Mata Air Panas di Kabupaten Solok Sumatera Barat Darmawan, Alfian; Muttaqin, Afdhal; Makmur, Murdahayu
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.471-478.2025

Abstract

Research has been conducted on determination of specific activity of natural radionuclides of hot water source in Solok Regency, West Sumatera. The study aims to determine the specific activity of radionuclides 238U, 232Th, and 40K and initial water parameters from hot water to effort in radiation safety and protection for environment and surrounding communities. Water samples were taken from three places, namely Bukik Gadang, Batu Bajanjang and Bukik Kili. Then the water samples were analyzed for specific activity using HPGe gamma spectrometer which was chopped 72 hours for radionuclides 238U, 232Th and 40K. The results of measuring acidity (pH), temperature and conductivity of water as initial parameters measured in each sample ranged from 6,1-6,5 for pH; 41-52 °C and 156,4-164,7 μS/m. The results of specific activity measurements on the highest samples were found in the 40K radionuclide ranging from (0.20 ± 0.01) Bq/L to (0.58 ± 0.02) Bq/L and the lowest was in 238U at MDC. Some sample measurement results did not detect all radionuclides because the results obtained were below the MDC. The specific activity of 238U, 232Th and 40K samples were below the threshold of PERKA BAPETEN No. 9 of 2009 which indicates that the research location is safe from radiation impacts.
Pendugaan Erosi Tanah Berdasarkan Nilai Suseptibilitas Magnetik di Kenagarian Alahan Panjang, Kecamatan Lembah Gumanti, Kabupaten Solok, Sumatera Barat Putri, Niken Rahayu; Budiman, Arif
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.486-492.2025

Abstract

A study has been conducted to estimate soil erosion based on magnetic susceptibility values in two areas, namely agricultural land and shrub land in Kanagarian Alahan Panjang, West Sumatra. Samples were taken at five points each at a depth of 10 cm, 50 cm and 100 cm located on a track with a length of 40 m. Measurements of magnetic susceptibility values were carried out using a Bartington Magnetic Susceptibility Meter with two frequencies, namely low frequency (klf) and high frequency (khf). These two measurement results were used to calculate the frequency-dependent susceptibility value (kfd). From the measurement results, it was obtained that the klf value for agricultural land ranged from 1925.3×10-5 SI to 2796.3×10-5 SI and shrub land ranged from 1041.3×10-5 SI to 2304.3×10-5 SI. These results indicate that the κlf value for all samples is classified as high which is controlled by ferrimagnetic minerals. Analysis of the klf and kfd values against depth shows that erosion has occurred on both land areas, where the area of land that has experienced erosion on the scrub land is smaller than on the agricultural land.
Studi in silico: Screening Virtual Senyawa Triterpenoid pada Canophyllum inophyllum Sebagai Kandidat Inhibitor SARS-CoV-2 Rena, Suci Ramda; Muttaqin, Afdhal; Fitriyani, Dian
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.459-465.2025

Abstract

This study aims to identify the potential of triterpenoid compounds from tamanu (Canophyllum inophyllum) as SARS-CoV-2 inhibitors through an in-silico approach using molecular docking. Ten triterpenoid compounds were selected and their binding affinity to the main protease (Mpro) of SARS-CoV-2 (PDB ID: 6W63) was tested. The results showed that four triterpenoid compounds, including oleanolic acid (-8.2 kcal/mol), friedelin (-8.2 kcal/mol), inophynone (-8.1 kcal/mol), and epifriedelanol (-8.2 kcal/mol) had lower binding affinity compared to the natural ligand (X77 -8.0 kcal/mol) and its reference ligand (paxlovid -7.7 kcal/mol), indicating a stronger interaction with the active site of the protein. Among the four candidates, only oleanolic acid forms hydrogen bonds with amino acid residues in the active site of the protein, which strengthens its potential role as a SARS-CoV-2 inhibitor. This finding suggests that these compounds, especially oleanolic acid, have the potential to be further developed as natural product-based Covid-19 therapies. This study provides an initial contribution to the exploration of natural products as a source of active compounds for the development of Covid-19 therapies through an in-silico approach.
Studi Eksperimental dan Analisis Statistik Multifaktorial terhadap Pengaruh Komposisi Limbah Plastik, Limbah Serabut Kelapa, Fly Ash, dan Gipsum sebagai Bahan Substitusi dalam Pembuatan Papan Semen Ramah Lingkungan Ardina Kusuma, Yessie; Ridho Akbar
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.444-458.2025

Abstract

This study develops an environmentally friendly cement board through the utilization of polypropylene (PP) plastic waste, coconut fiber, fly ash, and gypsum. The research aims to analyze the effect of material composition variations on the physico-mechanical characteristics according to SNI 03-2105-2006 standards and to determine the optimal formulation through a multifactorial statistical approach. The research methodology employed a 5×3 factorial design with two main factors: PP to coconut fiber ratio (10:30, 15:25, 20:20, 25:15, 30:10) and fly ash to gypsum ratio (24:36, 30:30, 36:24), resulting in 15 composition variations with three replications each (total 45 samples). Statistical analysis utilized Shapiro-Wilk normality test, Levene's homogeneity test, two-way ANOVA, and Tukey HSD post-hoc test. The results indicate that all formulations met the standard requirements for water content (1.48-4.51%) and density (0.84-0.91 g/cm³). However, the modulus of rupture values (3.67-8.71 kgf/cm²) did not meet the minimum standard for type 8 boards (82 kgf/cm²). Statistical analysis revealed highly significant effects of fly ash-gypsum composition on modulus of rupture (f-value=554.41; p-value<0.001) and component interactions on density (f-value=16.148; p-value<0.001). The optimal formulation was identified at PP:fiber ratio of 20:20 and fly ash:gypsum ratio of 24:36. It is concluded that this material shows potential for non-structural applications such as partitions and interior panels, but requires further optimization through process modifications and additive incorporation to enhance its mechanical performance.
Kajian Pengaruh PH dan Berat Kertas Terhadap Sintesis dan Karakteristik Silika Fiber dari Limbah Kertas HVS dan Kardus dengan Metode Sol Gel Ardya Pramesti Regita Cahyani; Foni Putri Sandi; Sintha Soraya Santi
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.428-434.2025

Abstract

The conversion of paper waste into silica fiber represents a strategic effort to reduce environmental pollution while adding value to HVS and cardboard waste. This study aims to examine the effect of pH and paper waste weight variations on the synthesis process and the characteristics of silica fiber produced using the sol-gel method. HVS and cardboard waste were used as cellulose sources, combined with sodium silicate and methanol. The variables tested included pH (3–7) and paper weight (8, 10, and 12 grams). Characterization involved density analysis, functional group identification using FTIR, and thermal stability assessment via TGA. The optimum condition for HVS waste was achieved at pH 5 with 8 grams, yielding a density of 1.8946 g/cm³, while for cardboard it was at pH 5 with 12 grams, yielding a density of 2.0228 g/cm³. Silanol and siloxane groups were identified in the FTIR spectra, and TGA results indicated good thermal stability at high temperatures. It can be concluded that variations in pH and paper waste weight significantly affect the formation and properties of the resulting silica fiber.
Pemodelan Bawah Permukaan Daerah Vulkanik Jawa Tengah Berdasarkan Data Magnetik EMAG2-V3 Herbianto, Sheren Aurellya; Rina Dwi Indriana; Muhammad Irham Nurwidiyanto
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.435-443.2025

Abstract

This study aims to analyze the subsurface magnetic properties of the volcanic region in Central Java based on EMAG2-V3 magnetic data. The magnetic data were reduced to the pole (RTP) to eliminate the effects of magnetic field inclination and declination, resulting in anomalies that are more symmetric with respect to their sources. Subsequently, magnetic anomaly separation was performed to obtain the regional and residual components. The resulting residual anomalies were further analyzed through two-dimensional inversion modeling to map the distribution of subsurface magnetic susceptibility. The interpretation results indicate that the residual magnetic anomalies range from -260 to 340 nT. Meanwhile, the inversion modeling reveals that subsurface susceptibility values vary from -10 × 10⁻⁴ to 20 × 10⁻⁴ CGS. Low susceptibility values are generally found in active volcanic bodies such as Mount Merapi, Merbabu, and Sumbing, indicating the presence of hydrothermal alteration zones and magma pockets. On the other hand, higher susceptibility values are mostly found on mountain slopes, associated with the presence of fresh volcanic rocks rich in ferromagnetic minerals. These findings suggest that magnetic anomaly analysis can be an effective method for revealing lithology and subsurface geological structures on a regional scale.
PENGEMBANGAN TRANSMISI DAYA DENGAN CAHAYA LASER UNTUK SUPLAI DAYA JARAK JAUH PADA SENSOR TILT METER Rodhiah, Salsa Ariani; Harmadi; Widiyatmoko, Bambang
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.507-515.2025

Abstract

 This study aimed to develop and test a Power over Fiber (PoF) system as a remote power supply to support the operation of a tilt meter sensor. The sensor is used to detect changes in ground inclination, which serves as an early indicator of landslide potential in disaster prone areas. The tests were conducted using infrared laser diodes with wavelengths of 808 nm and 940 nm as the optical power source. Light from the laser diode was transmitted through multimode optical fiber to the AFBR-POC206L photovoltaic device, which has the ability to convert optical power into electrical power. The test results showed that the photovoltaic device was capable of generating sufficient electrical power to support the operation of the tilt meter sensor and charge lithium polymer batteries. The PoF system successfully provided a stable power supply to operate the tilt meter sensor, demonstrating its ability to meet the power needs of geotechnical devices. This study proves that the PoF system can serve as a reliable and efficient alternative for remote power supply, particularly in geotechnical monitoring applications. Based on the results obtained, the PoF system shows great potential for implementation in various environmental monitoring applications requiring remote power supply.
Alat Deteksi Denyut Jantung Tipe Fingertip dengan Sensor Non-invasif untuk Masyarakat Pedesaan (Studi Kasus Desa Raharja, Banjar, Jawa Barat) Maria Evita; Prihatini, Jihan; Sawita, I Kadek Agus Sara; Kamal, Muhammad; Aprianti, Nur Asiah
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.500-506.2025

Abstract

Heart disease is one of the most lethal diseases in the world, including in Indonesia. This disease affects both urban and rural populations Lack of access to medical equipment particularly for heart rate detection, is the reason for developing a fingertip-type heart rate device using a cheap and convenient non-invasive sensor. This system consists of an infrared sensor equipped with an analog filter, an operational amplifier and Arduino Uno microcontroller for signal processing, and an LCD for displaying the heart rate. After calibration, this system was tested on 20 participants in Desa Raharja to validate its performance. In two phases of testing, the average accuracy obtained ranged from 3.28% to 8.08% in phase 1, and from 2.89% to 31.73% in phase 2. Most of the results have met the accuracy standards for heart rate detection equipment. The shortcomings of this research allow for further development in future studies.
Pengaruh Penyimpanan dan Pemanasan Terhadap Perubahan Ukuran Nanopartikel Parfum Campuran Minyak Royal Musk dan Minyak Atsiri Lili yang Disintesis Menggunakan Surfaktan Polimer PEG-40 HCO Winarti, Ratu Sesillia; Saragih, Horasdia
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.516-525.2025

Abstract

The purpose of this study was to produce perfume nanoparticles made from a mixture of royal musk oil and lily essential oil that can be dispersed in an aqueous medium and to investigate their size stability after storage and heating. The perfume nanoparticles were synthesized using an atomization technique with PEG-40 HCO as a surfactant, and their stability was evaluated through storage for up to 120 days and heating at temperature up to 45 °C. The results showed that storage for 120 days significantly increased the average particle diameter and its standard deviation. Heating also caused a significant increase in nanoparticle size. These findings indicate that the size of the perfume nanoparticles was not stable, as the zeta potential and the presence of PEG-40 HCO surfactant could not provide sufficient electrostatic and steric protection. Consequently, coalescence and Ostwald ripening occurred in the nanoparticles.
Indonesia Sistem Pengukuran dan Analisis Debit Air pada Kebocoran Pipa PDAM Rumah Tangga Berbasis Internet of Things Oktarisa, Dian; Yusfi, Meqorry; Harmadi, Harmadi
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.14.6.577-584.2025

Abstract

Pipe leaks in household PDAM systems often lead to water wastage and increased bills. This research develops a measurement and analysis system for water flow in household PDAM pipe leaks based on the Internet of Things (IoT) to address this issue. The system uses water flow sensors YF-S201 connected to a NodeMCU ESP8266 to measure water flow rates. It monitors two pipe branch areas, with each branch equipped with a water flow sensor at both the inlet and outlet points. The NodeMCU ESP8266 compares the incoming and outgoing water flow rates for each branch. If the flow rates are identical between the two sensors, the pipe is deemed safe; however, any discrepancy between the flow rates indicates a potential leak. The system can identify the area and severity of the leak based on the flow rate difference and calculate the water usage cost. Data collection is performed in the morning, afternoon, and evening, with six trials at each measurement time. The trials are conducted at 5-minute intervals to measure water volume and flow rate. Testing results show an average error percentage of 2.2% compared to a measuring cup, with system accuracy reaching 97.8%. Measurement data is displayed on an LCD and sent to the Blynk app via smartphone for remote monitoring.

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