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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 1,782 Documents
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Rancang Bangun Alat Ukur Tekanan Hidrostatis dan Kedalaman Perairan Berbasis Sensor Serat Optik Yunus, M Fachri; 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.13.5.718-724.2024

Abstract

The design of hydrostatic pressure and water depth measuring instrument based on optical fiber sensor using intrinsic method has been carried out. The design of this hydrostatic pressure and water depth measuring instrument consists of fiber optic sensors which include a light source in the form of a 5V diode laser, FD-620-10 optical fiber as a light transmission medium and OPT101 photodetector. Arduino Uno R3 board as a data processor, and I2C LCD as a viewer of measurement results. Characterization of the fiber optic sensor is done by varying the bending based on the number of serrations that cause differences in output voltage on the fiber optic sensor. Optimal results were obtained when the serrations amounted to 5 with a sensitivity value of -0.0863 V/kPa. The maximum hydrostatic pressure that can be measured is at a water depth of 1.5 m. The measurement results of hydrostatic pressure and water depth obtained with the designed tool against the theory and comparison tool obtained a percentage error of 4.42% and 4.32%, respectively
Desain dan Implementasi Sistem Pendingin Berbasis Peltier TEC 12706 dengan Pemantauan Jarak Jauh Melalui Aplikasi Blynk pada Smartphone Puspita, Nabilla Putri; Yusfi, Meqorry
Jurnal Fisika Unand Vol 14 No 1 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.1.8-14.2025

Abstract

Cooling technology plays an important role in daily life, particularly in refrigerators used for storing fruits, vegetables, and beverages. However, conventional cooling systems still use freon, which can damage the ozone layer. This study utilizes the Peltier Effect on the Peltier TEC 12706 module as an environmentally friendly cooling component. The DHT22 sensor is used to measure temperature and humidity, while the NodeMCU ESP8266 processes sensor data displayed through the Blynk application. Three fans are installed outside the cooling chamber to prevent the Peltier module from overheating, and one fan is placed inside the chamber for air distribution. A heatsink is used to assist in heat dissipation. Testing compared the DHT22 sensor with AZ HT-02 and FY-11, producing regression values of R² = 0.9902 for temeprature and R² = 0.9798 for humidity, indicating high accuracy. Using two Peltier TEC 12706 modules and a 12 V 30 A AC-DC adapter, the temperature in the cooling chamber with dimensions (26x17x10) cm was reduced to 19.6°C, with humidity rising to 90.1% within 2 hours. These results show that the developed cooling system can function effectively.
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.
Pencemar Mikroplastik dalam Air dan Sedimen Sungai Sail di Kota Pekanbaru Widyadhanaa, Fidela Raissa; Budijono, Budijono; Harjoyudanto, Yudho; Hendrizal, Andri
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.13.6.792-798.2024

Abstract

This study aims to determine the type and abundance of microplastics in the water and sediment of the Sail River. This study was conducted from January 2024 to April 2024. Sampling was carried out once a month for three months at 3 stations, namely: Station 1 (Jalan Akasia), Station 2 (Jalan Hangtuah), Station 3 (Jalan Sumber Sari). Microplastic samples in water and sediment were analyzed at the Waste Treatment Laboratory of the Faculty of Fisheries and Marine Sciences, University of Riau.. The research results found 4 types of microplastics per station in both water and sediment, with the most common types being fibers in water and fragments in sediment. The total abundance of microplastics in water ranges from 216.67 – 280 particles/m3 and sediment ranges from 4,006.67 – 4,720 particles/kg. It was concluded that there was no difference in the total abundance of microplastics in either water or sediment between the stations studied.
Rancang Bangun Sistem Pelipat Pakaian Menggunakan Sensor Load Cell dan Sensor Ultrasonik Berbasis Arduino Mega2560 Jihan Latifah Hanum; Nini Firmawati
Jurnal Fisika Unand Vol 14 No 1 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.1.15-21.2025

Abstract

A clothes folding tool has been made using 4 load cell sensors and a clothes container using an ultrasonic sensor based on the Arduino Mega2560. Load cell sensor to detect mass on the folding board, if the mass is small equal to 375g, then the MG996R servo motor is active, if the mass is greater than 375g, then the servo motor is not active, the LCD screen displays excess mass. The HC-SR04 ultrasonic sensor detects the distance between clothes and clothes folders. If the detected distance is 2 cm, the buzzer sounds more than once. The buzzer also sounds once indicating the folding process is complete. The characteristics of load cell sensors 1, 2, 3, and 4 have linear correlation coefficients of 0.9985, 0.9985, 0.9968, and 0.998 respectively. The characteristics of the ultrasonic sensor have a linear correlation coefficient of 1. The average folding time is obtained from the folding time using a folding tool and the folding time manually 3 times for each garment. The average manual folding of shirt A, shirt B, trousers A, and trousers B was 9.07s, 15.34s, 9.68s, and 10s respectively, while using a folding tool was 5, respectively. 47s, 5.49s, 5.44s, and 5.47s. Testing variations in clothing mass with clothing folding time, it was found that variations in clothing mass had no effect on the length of time folding clothing
Studi Pendahuluan Uji Aktivitas Katalitik Katalis Montmorillonit K-10 Yang Dimodifikasi Cu2+ Admi, Admi; Isnaini, Delvi; Syukri, Syukri
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.13.6.820-826.2024

Abstract

The current study examines the catalytic activity of Cu2+-exchanged cation montmorillonite K-10 (MMT K-10) catalyst, which synthesized by hydrothermal method. X-ray fluoressence (XRF) and X-ray Diffraction (XRD) were used for characterizing the newly synthesis catalyst. The effect of thermal activation on the support of MMT K-10 with a modifier Cu investigated on its catalytic performance for conversion waste cooking oil to produce fatty acid methyl ester (FAME) by transesterification reaction. Synthesis biodiesel was further characterized by Gas Chromatography-Mass Spectroscopy (GC-MS). The biodiesel was obtained at transesterification reaction conditions: 3% (w/w) catalyst loading, molar ratio of oil to methanol = 1:10, and 3 h of reaction time at 90°C. The yield of FAME of WCO for MMT K-10, MMT K-10/Cu2+, MMT K-10 (activation 110°C)/Cu2+, MMT K-10 (activation 300°C)/Cu2+ catalysts were the 9,47%; 10,36%; 10,41%; and 12,01% of FAME, respectively. This study exhibites that the activation of thermal on the support MMT K-10 which modified by Cu2+ leads to reduction of the crystal size. The decreasing crystal size contributes on increasing catalytic performance of the heterogeneous catalyst.
Indonesia Prototipe Sistem Kontrol Suhu, Kelembaban, dan Debu Ruangan Secara Otomatis Berbasis Arduino Uno Saumi, Amalia; Nini Firmawati
Jurnal Fisika Unand Vol 14 No 1 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.1.29-35.2025

Abstract

A prototype design of an automatic room temperature, humidity, and dust control system based on Arduino Uno has been carried out. This control system is equipped with a DHT22 sensor to detect temperature and humidity, a GP2Y1010AU0F sensor to measure dust density, an L298N motor to regulate the speed of the DC fan and blower, a relay as an automatic switch for the humidifier, and an LCD to display the values read by the sensor. The system works if the measured temperature is more than 30℃ the DC fan is active, if the humidity is less than 60% the humidifier module is active, and if the detected dust density is more than 150 μg/m3 the blower is active to remove dust. The results of the study showed that the system can work well according to its respective functions. When the measured temperature and humidity exceed the set values, the fan and humidifier work to stabilize the room temperature and humidity. When the detected dust density exceeds the set value, the blower works to remove dust in the room with a success rate of 80.07%. The DHT22 sensor can measure room temperature and humidity with a temperature error value of 2.81% and a humidity error value of 5.53%. While the GP2Y1010AU0F sensor can detect dust density with an error value of 3.54%.
Penentuan Sebaran Reservoar Menggunakan Atribut Seismik Pada Lapangan “Cemara” Cekungan Sumatera Tengah, Riau Zalwi, Eka Nadila; Namigo, Elistia Liza; Azlin, Amalia
Jurnal Fisika Unand Vol 14 No 1 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.1.75-81.2025

Abstract

A research has been carried out to determine the distribution of reservoirs in the "Cemara" Field, Riau using the seismic attribute method. The data used is secondary data resulting from the acquisition of PT. Bumi Siak Pusako in the form of 3D Post-Stack Time Migration (PSTM) seismic data and well data. Seismic attribute analysis is carried out by changing the original seismic volume into a sweetness seismic volume, then extracting the RMS (Root Mean Square), average energy and instantaneous frequency seismic attributes. The results of the RMS and average energy attribute map analysis show that the reservoir distribution area has a high amplitude with attribute values ​​of 2.0-3.2 and 7.0-11.00 respectively, which are high values ​​for each attribute. The results of the instantaneous frequency attribute show that the reservoir distribution area is at low frequency with an attribute value of 12.5-0.00. The crossplot of the attribute with the net sandstone layer value shows a higher distribution of clean sandstone in the production well area. The cross plot of attributes with vshale values ​​shows lower values ​​in the production well area, indicating that the reservoir distribution around the production well has good porosity. The reservoir distribution zone is in the altitude zone with a depth of ± 1,830 feet in the west and northeast directions, represented by the sweetspot zone in the amplitude attribute.
Investigasi Bidang Gelincir Zona Rawan Longsor dengan Metode Geolistrik di Sekitar Kawasan Wisata Panorama Bukittinggi Putri, Mifthahul; Liza Namigo, Elistia
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.13.6.742-748.2024

Abstract

The investigation of the slip plane in the landslide-prone area around Taman Panorama, Kayu Kubu, Bukittinggi City has been conducted using the 2-dimensional resistivity geoelectric method with Wenner configuration.The study was carried out on hills with a slope of 40°. Data collection was conducted along three tracks with lengths of 80, 70, and 70 meters respectively. Data processing was done using Res2dinv software to display a 2-dimensional image of subsurface layers based on the measured resistivity values in the field. The interpretation of the data results showed the presence of slippage zones along each track in the form of an volcanic breccia rock layer. For line AB, resistivity values range from 250 to 813 Ωm at depths of 3.75 - 15.9 meters. Line CD has resistivity values ranging from 137 to 375 Ωm at depths of 3.75 - 15.9 meters, while track EF had resistivity values range from 183 – 287 Ωm at depths of 6.38 – 9.25 meters. Based on the depths, the identified slip surfaces are categorized as quite deep, thus this area is classified as a landslide-prone zone.
Indonesia IDENTIFIKASI PERCEPATAN TANAH MAKSIMUM MENGGUNAKAN METODE MIKROTREMOR DI KOTA PADANG Illona giovanni, Vannessa; Pujiastuti, Dwi; Pohan, Ahmad Fauzi
Jurnal Fisika Unand Vol 14 No 1 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.1.1-7.2025

Abstract

The position of Padang City on the coast and close to the subduction zone makes it very vulnerable to the impact of earthquakes, therefore mitigation efforts against potential disasters are very important to reduce the risk of such events. This study was conducted to map ground acceleration using the microtremor method as one of the efforts in earthquake disaster mitigation. The calculation of the maximum ground acceleration (PGA) value uses dominant frequency data (f0), amplification factor (A0 ) and soil vulnerability (kg) as input data obtained from microtremor data analysis using the Horizontal to vertical spectral ratio (HVSR) method. The microtremor data processed were 33 measurement points in 11 sub-districts in Padang City with a distance between points of 1-5 km. The dominant frequency, amplification, vulnerability and maximum ground acceleration values were then mapped to determine areas prone to earthquake disasters. Areas of Padang City with a high level of vulnerability can be seen in Bungus Teluk Kabung District and Padang Barat District.

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