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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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Analisis Sensitivitas Sensor GY-ML8511 dalam Deteksi Formalin M. Farhan Ramadhan; Meqorry Yusfi; Harmadi Harmadi
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.684-689.2024

Abstract

Food safety is a crucial aspect in meeting people's nutritional needs. Formalin, a dangerous preservative, is often used illegally to extend the shelf life of foodstuffs, posing serious risks to consumer health. This research develops a portable technology for rapid detection of formaldehyde in foodstuffs. The method utilizes the interaction between UV light and the concentration of formaldehyde in a sample treated with Schiff reagent, enabling the measurement of UV uptake proportional to formaldehyde concentration. The Schiff reagent reacts with formalin to produce a colored compound whose absorbance is measured to detect and quantify formalin in the sample. The designed optical system focuses on measuring the intensity of light from a UV LED source, which is then transmitted through the sample. The successfully transmitted light intensity is converted into an electrical signal by the GY-ML8511 sensor, which is then processed by the NodeMCU ESP8266 to display the concentration of formalin on the LCD screen. This research also analyzes the sensitivity and selectivity of the GY-ML8511 sensor to evaluate its performance and reliability in detecting formaldehyde, with the ultimate goal of improving food safety through innovative detection technologies, such as the use of biosensors and advanced spectroscopy. This technology contributes to existing solutions by enabling rapid and accurate detection at various stages of food production, thereby reducing the risk of contamination and improving compliance with food safety standards
Analisis Korelasi Umur, Massa Tubuh dan Faktor Eksposi Terhadap Entrance Surface Air Kerma pada Pemeriksaan Thorax di Rumah Sakit Universitas Andalas Suci Indah Sari; Dian Milvita; Ramacos Fardela; Ida Bagus Gede Putra Pratama; Amel Oktavia S
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.602-609.2024

Abstract

Research has been conducted on the correlation analysis of age, body mass, and exposure factors to Entrance Surface Air Kerma (ESAK) in the Radiology Installation of Andalas University Hospital. The study was conducted by collecting data on adult thorax examination patients over 15 years of age and body mass (60 ± 10) kg in Posterior-Anterior (PA) and Anterior-Posterior (AP) projections for ± 5 months. Patient data used in PA projections are 107 patient data with the Automatic Exposure Control (AEC) method, 9 patient data with manual methods and 10 AP projection patient data with manual methods. Analysis was conducted using the Pearson correlation test. The results showed that body mass and exposure factors have a very strong relationship with ESAK as indicated by r = 0.805 to 0.990. As body mass and exposure factor increase, the average ESAK received by patients will increase, while age has a weak relationship with ESAK as shown by r = -0,246 to 0,227.
SUSEPTIBILITAS MAGNETIK TANAH SEBAGAI INDIKATOR TANAH LONGSOR DI DAERAH MALAMPAH KABUPATEN PASAMAN Rahmatul Fitriah; Afdal Afdal
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.697-703.2024

Abstract

Soil magnetic susceptibility values have been measured in the Malampah area of Pasaman Regency using the rock magnetism method. Samples were taken from two areas where landslides had occurred and two areas where landslides had not occurred. Samples were taken at the top, middle, and bottom with 5 cm, 25 cm, and 50 cm depth variations. Measurement of soil magnetic susceptibility value was conducted using Bartington Susceptibility Meter MS2B. The results showed that the magnetic susceptibility value at low frequency (ꭓLF) at each sampling point is higher than the high-frequency magnetic susceptibility value (ꭓHF). Indicating that the research location contains superparamagnetic grains. From the range of ꭓLF values obtained, it is estimated that the magnetic minerals that control the samples are paramagnetic and ferromagnetic and the mineral type is estimated to be ilmenite (FeTiO3). Areas where landslides have occurred have a higher ꭓFD (%) value than areas where landslides have not occurred. The higher the ꭓFD (%) value, the more superparamagnetic grains will be in the sample. Superparamagnetic grains are smooth and easily absorb water. Adding soil mass due to water causes the soil to move quickly when on a slope.
Analisis Deformasi di Lampung dan Selat Sunda berdasarkan Data GNSS tahun 2018 hingga 2021 Ongky Anggara; Muhammad Ario Eko Rahadianto; Satrio Muhammad Alif; Een Lujainatul Isnaini
Jurnal Fisika Unand Vol 13, No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.637-643.2024

Abstract

The Lampung Province and Sunda Strait have a seismic gap zone with the potential for major earthquakes in the future. This study analyzes the deformation occurring in this region using continuous Global Navigation Satellite System (GNSS) station data from Indonesia Continuously Operating Reference Station (InaCORS) and Sumatran GPS Array (SuGAr) from 2018 to 2021.5. The GNSS data was processed using the Bernese 5.2 scientific software, applying least squares for velocity changes and statistical tests to analyze significance. The data processing was carried out in two schemes: the first scheme covering 2018-2020, and the second covering 2019-2021. The results of the deformation analysis from 2018 to 2021, using two continuous GNSS data processing schemes, showed velocity changes relative to the Sundaland Plate ranging from ~2 mm/year to ~20 mm/year. In the eastern region of the Sumatra fault, the velocity changes were smaller, around ~5 mm/year, due to the minimal influence of tectonic activity. However, in the Sunda Strait region, the deformation was influenced by volcanic activity. The deformation occurring in Lampung Province and the Sunda Strait, based on GNSS velocity changes, significantly contributes to tectonic and volcanic activities.
KARAKTERISTIK PAPAN PARTIKEL DARI KULIT KAKAO DAN SERAT PINANG DENGAN VARIASI POLYMERIC METHYLENE DIPHENYL DIISOCYANATE Yanandra Amelia Putri; Alimin Mahyudin
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.671-676.2024

Abstract

Research has been carried out to analyze the effect of the percentage of polymeric methylene diphenyl diisocyanate (PMDI) on the physical and mechanical properties of particleboard made from cocoa shells and areca fiber. This research uses a ball mill to obtain the particle size that passes through an 80 mesh sieve. The physical properties tested were density and water content, while the mechanical properties tested were flexural strength and compressive strength using the Universal Testing Machine (UTM). The PMDI variations used are 4%, 6%, 8% and 10%. The density values obtained ranged from 0.97-1.13 g/cm3, water content values ranged from 7.3 - 9.11%, compressive strength values ranged from 216.63-285.02 kg/cm2 and flexural strength values ranged from 1713 .97-2235.23 kg/cm2. The best particle board is particle board with a PMDI content of 8%. The water content and compressive strength values of particle board meet SNI 03-2105-2006, but the density and flexural strength values do not meet SNI 03-2105-2006. Based on the density value of the particle board, the particle board produced is a type of high density particle board.
Analisis Pengaruh Variasi Elektrolit H2SO4, KOH, dan Na2SO4 Terhadap Kinerja Elektrokimia Superkapasitor berbasis Biomassa Kulit Kakao Exaudi Pratama Rajagukguk; Widi Mulia Nasution; Mulda Muldarisnur; Yuli Yetri
Jurnal Fisika Unand Vol 13, No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.610-616.2024

Abstract

Utilization of cocoa pod waste (Theobroma cacao) as a supercapacitor carbon electrode through electrolyte optimisation was successfully conducted with 0.5M KOH chemical activator. Carbon production starts with slicing cocoa pods, sun drying, pre-carbonisation, crushing of carbon particles with mortar and ball milling, and particle size uniformity using a sieve. The obtained particle powder was chemically activated with 0.5M KOH, coin-molded into of carbon monolith and finished with integrated pyrolysis. Samples were subjected to one-stage integrated pyrolysis by carbonisation from room temperature to 600˚ C in an N2 gas environment, followed by physical activation to 700˚ C in a CO2 gas environment. Testing the electrochemical properties of carbon electrodes based on different types of electrolytes (H2SO4, KOH, and Na2SO4) IM using cyclic voltammetry (CV) and galvanostatic charge discharge (GCD) methods. The sample provided with H2SO4 electrolyte was confirmed to have the highest specific capacitance of 412.94 F/g at a current of 1 A/g. Based on the results of this study, it is confirmed that cocoa pods have the potential to be a source of electrode base material with H2SO4 electrolyte solution as a source of charge carrier in supercapacitor cell devices.
Pembuatan dan Karakterisasi Bolus Berbahan Silicone Rubber RTV 00A dengan Variasi Komposisi Clear Catalyst Dewi Fajriani; Afdhal Muttaqin H.S; Muhammad Ilyas
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.704-710.2024

Abstract

The manufacture and characterization of boluses made from Silicone Rubber RTV 00A with 4% clear catalyst composition have been carried out. The bolus was made with a size of (15x15) cm and the thickness of 1.0 cm. Each bolus sample was characterized to obtain physical properties (density and water absorption capacity), mechanical properties (tensile strength, strain, and elastic modulus), Relative Electron Density (RED), Percentage Surface Dose (PSD), and absorbed dose. RED value were obtained through tomographic images using a CT-Simulator by determining 5 Region of Interest (ROI) points. PSD and absorbed dose values were measured using a plan parallel chamber detector with energy of 9 MeV. The bolus has a density of (0.815 ± 0.150) g/cm³ and water absorption of (12.42 ± 0.01)%, tensile strength of (0.286 ± 0.091) MPa, an elongation of (22.93 ± 0.22)%, and an elastic modulus of (5.880 ± 11.52) MPa. The RED value of (1.114 ± 0.021) g/cm³ a PSD of 132.40% and an absorbed dose of 233.82 cGy in energy of 9 MeV. RTV 00A can be developed as a bolus base material.
Identifikasi Bidang Gelincir Zona Rawan Longsor di Kawasan Wisata Puncak Taruko Kabupaten Agam Menggunakan Metode Geolistrik Resistivitas Husnatul Fauzana; Elistia Liza Namigo
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.644-650.2024

Abstract

A research has been conducted to identify the surface of rupture plane in Puncak Taruko area, Agam Regency, West Sumatra Province using 2-dimensional resistivity geoelectric method of Wenner-Schlumberger Configuration. Data collection was carried out on three tracks with track lengths of 80, 100 and 100 m and 5 m electrode spacing. The research area is a plateau with a slope of up to 40º which is directly adjacent to the very steep cliffs of Sianok Canyon with a cliff height of 30-100m. Data processing was carried out using Res2dinv software to display a 2-dimensional image of the subsurface layer structure based on the resistivity values measured in the field. In the cross section of the mapping results in the three tracks, 4 rock layers were identified, namely clay, sand, tuff and granite. The interpretation results show that the sliding plane on each track is tuff. For Track 1 with a depth of 3,75-15,9m, for track 2 it is 5,15-19,8 m and a depth of 6,38-19,8 m for track 3. Based on the interpretation of 2D image results, the area of track 1 and 2 has a translational avalanche type and the area of track 3 has a rotational avalanche type. Based on the depth and thickness of the slide field, the greatest risk of landslide is on track 3.
Rancang Bangun Alat Ukur Kadar Air dan Keasaman untuk Mengetahui Kualitas Madu Berbasis Mikrokontroler Taufik Saputra; Nini Firmawati
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.
Penerapan Metode Short Time Fourier Transform (STFT) dalam Menentukan Frekuensi Dasar Alat Musik Talempong Minangkabau Fachri Hernanda; Meqorry Yusfi
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.677-683.2024

Abstract

At this research has determined the fundamental frequency of talempong musical instruments using the Short Time Fourier Transform (STFT) method. The research is divided into three stages, namely recording dataset retrieval, method implementation and base frequency analysis. In this research, sound recordings of talempong are collected into a dataset which is divided into several frequencies and then synthesized using the STFT methods then synthesized using the STFT method to determine the frequency of the talempong sound signal to determine the frequency of the talempong sound signal. The frequency value from the STFT process is then compared with the general base frequency to determine the percentage of accuracy of the talempong sound synthesis. From this research, the results obtained average error value of 4,39% and an accuracy percentage of 95,61%.

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