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Journal of Experimental and Applied Physics
Published by Universitas Negeri Padang
ISSN : 29880378     EISSN : 29879256     DOI : -
Core Subject : Science, Engineering,
Control & Systems Engineering Electrical & Electronics Engineering Materials Science & Nanotechnology Physics
Journal of Experimental and Applied Physics: an international peer-reviewed open-access journal dedicated to interchange for the results of high-quality research in all aspects of theoretical physics, applied physics, electronics and instrumentation, material physics, biophyiscs, geophysics, high energy physics and computational physics.
Arjuna Subject : Fisika dan Astronomi - Instrumentasi
Articles 81 Documents
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Solar Tracker Arduino Reza Angraini; Mona Sari; Yohandri Yohandri
Journal of Experimental and Applied Physics Vol 3 No 1 (2025): March Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i1.97

Abstract

Abstract: Electrical power is essential to human life, but dependence on non-renewable fossil fuels is driving the need for alternative energy development such as solar power. Conventional systems without solar trackers cause the efficiency of solar panels to decrease because they cannot optimally follow the movement of the sun. In this research, an Arduino-based dual-axis solar tracker is developed that can move on two axes (horizontal and vertical) to increase the efficiency of solar energy absorption and is equipped with a rain sensor to protect solar panels. This system has the advantage of maximizing energy absorption and providing additional protection from environmental conditions. The test results show the relationship between sunlight intensity and the voltage generated by the solar panel, the higher the sunlight intensity (lux), the higher the voltage generated by the solar panel. For example, at an intensity of 1,300 lux, the voltage reaches 4.7 volts, while at an intensity of 55 lux, the voltage decreases to 0.3 volts. The relationship between the light intensity and the analog reading of the LDR sensor shows that the higher the light intensity received, the higher the analog reading produced by the sensor. At low light intensities, such as 190 lux, the LDR readings at each position (top left, top right, bottom left, bottom right) tend to be different, reflecting the uneven distribution of light. In contrast, at higher light intensities, such as 500 lux, the LDR readings are larger and more evenly distributed, indicating that the solar panel is already in the optimal position perpendicular to the direction of incoming sunlight.Keywords: Solar Tracker, LDR Sensor, Intensity, Voltage, Lux Meter.
Monitoring Tool for Infusion Administration in Patients Using NodeMCU ESP32 Fernando, Erik
Journal of Experimental and Applied Physics Vol 3 No 2 (2025): July Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i2.100

Abstract

The use of appropriate technology in today's era is very necessary, especially in the medical world, one of which is in the administration of IV fluids. Infusion (intravenous therapy) is a medical action to provide fluids in the form of drugs and nutrients through the blood vessels to patients precisely and consistently in doses according to the patient's needs. The infusion equipment currently used is still manual by medical personnel or nurses in installing and monitoring patients routinely. In the use of this infusion, problems will arise if the use of the infusion is not monitored properly so that there will be a run out of IV fluid or an excess dose of IV which can endanger the patient. Due to changes in the drip rate, fluids that are less or more than what is needed by the patient can cause suboptimal therapy, dehydration or metabolic disorders. Previous research has made an automatic IV monitoring tool, but IV monitoring cannot be done remotely, as well as wasteful use of microcontrollers. From the problems that arise, a monitoring system for IV administration to hospital patients is designed using the NodeMCU ESP32. This tool starts from reading the number of IV fluid drops by the Photoelectric LM393 sensor, the data of which is then processed by the NodeMCU ESP32. The data is compared to a predetermined configuration, and if the number of drops exceeds a certain limit, a notification will be sent to the blynk application. In addition, this tool also sends data on the number of drops to the blynk application for remote monitoring. The results of the tool test show that the tool has a high level of accuracy with an average low error percentage of 1.75%, and is able to provide real-time data for monitoring and controlling the speed of infusion drops according to patient needs.
Using Sensors with Internet of Things for Landslide Detection System: A Systematic Literature Review Fitri, Sarah; Asrizal, Asrizal
Journal of Experimental and Applied Physics Vol 3 No 2 (2025): July Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i2.103

Abstract

Landslides are among the most common natural disasters in regions with high rainfall and unstable geological conditions. To improve the effectiveness of mitigating this disaster, various Internet of Things (IoT)-based early detection systems have been developed. This research uses Systematic Literature Review (SLR) approach to analyze various sensor technologies and IoT in landslide monitoring system. Based on the analysis, it was found that soil moisture sensor, accelerometer, and piezometer are the most commonly used technologies in the monitoring system. Soil moisture sensors measure the moisture content in the soil, accelerometers detect unstable soil movement, while piezometers measure soil pore pressure. In addition, communication technologies such as LoRa-WAN and Narrowband-IoT (NB-IoT) enable real-time data transmission with low power consumption and wide coverage. The results show that the use of IoT technology can improve the accuracy of landslide early detection. However, there are still some major challenges in implementing this system, mainly related to the limited network infrastructure in remote areas and the relatively high cost. Therefore, this research recommends the development of a more efficient early detection system, adaptive to extreme environmental conditions, and considering integration with artificial intelligence technology to improve prediction and response to potential landslides. Thus, IoT-based detection systems can contribute significantly to landslide mitigation and risk reduction efforts
Development of Proximity Sensor-Based Mathematical Pendulum Experiment Modeling Tool for Video Tracker Analysis Yosi, Yosi; Asrizal, Asrizal
Journal of Experimental and Applied Physics Vol 3 No 2 (2025): July Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i2.104

Abstract

Physics has an important role in the development of science and technology today. One of the interesting motion phenomena in physics is simple harmonic motion on a mathematical pendulum. Physical phenomena can be observed through experiments using research instruments. The observation shows that the data of the mathematical pendulum experiment is only limited to the oscillation time and the number of swings. In addition, the instruments used are still manual. One solution to overcome these problems is to use a proximity sensor-based mathematical pendulum experiment modeling tool and video analysis using a tracker. The purpose of this research is to determine the accuracy and precision of the mathematical pendulum modeling tool experiment, knowing the effect of changes in rope length on the period and frequency of the mathematical pendulum modeling tool. This research is a type of design and development research (Research and Development). Data collection was carried out with two events, namely direct and indirect measurements. Direct measurements are made by varying the length of the rope on the mathematical pendulum experiment modeling tool. Indirect measurements are made to determine the accuracy and precision of the proximity sensor-based mathematical pendulum modeling tool. The results of the data analysis obtained are displayed in the form of tables and graphs. Based on the data analysis, three research results can be stated. First, video analysis using a tracker obtained a sinusoidal graph. Second, the average accuracy and precision of the modeling tool are period 99.50% and 96.66%, frequency 99.68% and 96.47%, and acceleration of gravity 99.20% and 95.50%. Third, the longer the rope used, the greater the period obtained, which is inversely proportional to the smaller frequency.
Optimation Of Variation Of Massive And Contact Time Using Zeolit On The Reduction Of Iron Metal (Fe) On Dug Well Water In Air Molek Indragiri Hulu Azmi, Angel
Journal of Experimental and Applied Physics Vol 3 No 2 (2025): July Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i2.107

Abstract

The limited capacity of the Regional Drinking Water Company (PDAM) to provide clean water has led many communities to rely on groundwater sources, particularly dug wells, for daily use. However, such water sources are prone to contamination by heavy metals. A preliminary analysis using Atomic Absorption Spectrophotometry (AAS) of a dug well in Air Molek, Indragiri Hulu Regency, revealed an iron (Fe) concentration of 1.029 mg/L, exceeding the acceptable limit for clean water. Prolonged use of water with high Fe content poses significant health risks, including gastrointestinal and skin disorders. This study aims to assess the effectiveness of zeolite synthesized from rice husk ash and coal ash in reducing Fe concentrations in well water. An experimental method was employed, in which 1 liter of contaminated water was treated with varying zeolite dosages (1 g, 2 g, and 3 g) and contact times (30, 60, 90, and 120 minutes). The treated water samples were analyzed using AAS to determine the remaining Fe levels. The results demonstrated that the optimal Fe removal was achieved with a zeolite dosage of 2 g/L and a contact time of 60 minutes, indicating the potential of modified zeolite as an effective adsorbent for improving groundwater quality.
Hydrological Analysis for Spatial Plan of Hamparan Rawang District to support Resilient Urban Development Gustiabudi, Rahmat
Journal of Experimental and Applied Physics Vol 3 No 2 (2025): July Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i2.118

Abstract

Hamparan Rawang District plays a crucial role in the overall spatial planning and development strategy of Sungai Penuh City. However, Hamparan Rawang District encounters significant environmental challenges that threaten its natural resources and ecosystems, biodiversity, and overall sustainable development and resilience. Hydrological analysis and spatial planning of Hamparan Rawang District is conducted for disaster mitigation and resilient urban development strategies. The descriptive analysis method is carried out by direct observation of the characteristics and potential problems in Hamparan Rawang District. During the rainy season, several places in the watershed in the Hamparan Rawang District are prone to flooding. In 2016, the area of ​​flood inundation in Hamparan Rawang District reached 11 percent of the area of ​​Hamparan Rawang District. The area of ​​flood inundation increased in 2020 to 18.58 percent of the area. In general, drainage channels in Hamparan Rawang District have reached almost the entire city area.. However, its maintenance management has not been optimal, this is evidenced by the overflow of water onto the road surface when it rains.
Seismicity Level Analysis of the West Coast of Northern Sumatra in 1964-2023 based on Spatial and Temporal Variations of Seismotectonic Parameters Arieza, Moreno Wahyu
Journal of Experimental and Applied Physics Vol 3 No 3 (2025): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i3.102

Abstract

Located in the subduction zone of the Indo-Australian Plate beneath the Eurasian Plate, the west coast of northern Sumatra exhibits high seismic activity, as evidenced by the 2004 Aceh earthquake (Mw9.1) and the 2005 Nias–Simeulue earthquake (Mw8.6). This study aims to analyze the spatial and temporal variations of b-values and a-values to assess rock stress accumulation and seismicity levels, as a preliminary step toward earthquake hazard mitigation. The analysis was conducted using the Maximum Likelihood method based on the Gutenberg–Richter law. Earthquake data were obtained from the USGS catalog from 1964 to 2023, with events of Mw ≥ 5.0 and focal depths shallower than 60 km, within the coordinates 2.01°S–7.54°N and 92.77°E–99.45°E. The results indicate that b-values vary from 0.53–0.57 in Nagan Raya and Aceh Singkil to as high as 2.07 in the Indian Ocean northwest of Aceh. Similarly, a-values range from 4.3 to 12.45, with the lowest values also located in Nagan Raya and Aceh Singkil. The combination of low b- and a-values in these areas suggests high stress accumulation, indicating a greater potential for future significant earthquakes. The estimated earthquake return periods for Mw ≥ 7.0, Mw ≥ 8.0, and Mw ≥ 9.0 in Nagan Raya are 17.6, 60.8, and 210.3 years, respectively, while in Aceh Singkil they are 15.7, 57.3, and 208.8 years, highlighting the urgent need for seismic hazard preparedness in these regions.
Geophysics Quantitative Research Mapping of Geomagnetic Method Implementation for Geothermal Exploration: A Bibliometric Analysis Magribi, Fatin; Asrizal, Asrizal; Amir, Harman; Fitri, Leni
Journal of Experimental and Applied Physics Vol 3 No 3 (2025): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i3.106

Abstract

Indonesia is the second country with the largest geothermal potential in the world because Indonesia has many volcanoes and active tectonic activity causes the formation of geothermal energy around the mountain. The population growth rate in Indonesia is soaring, this condition is inversely proportional to the availability of non-renewable energy in Indonesia. The solution is to look for alternative energy substitutes, namely renewable energy, for example geothermal. This study aims to see the development and trends in the use of geomagnetic methods for geothermal exploration. The method used is bibliometric with a quantitative approach. Data retrieval and processing used the publish or perish application integrated with Google Scholar. The data used were 200 articles published on Google Scholar during 2015-2025 and 80 keywords found. Data analysis techniques by looking at the development of article trends each year, data network visualization, data overlay visualization and data density visualization. The results obtained from publications with the topic of geomagnetic method utilization trends for geothermal exploration in 2015-2025 increased every year. For the results of data network visualization, not only Indonesia but various international countries have also begun to utilize geothermal. The results of the visualization of Indonesia's geothermal data overlay were much sought after in 2019.
Effect of the composition of activated carbon from coconut shell and paraffin on the performance of a carbon paste electrode for the detection of Pb(II) Habibi, Haadi Farros
Journal of Experimental and Applied Physics Vol 3 No 3 (2025): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i3.117

Abstract

This study examines the effects of the ratio on the composition of carbon paste electrodes with carbon derived from coconut shells and the feasibility of these electrodes as working electrodes in the cyclic voltammetry method for the measurement of lead Pb(II) values. In this study, measurements were conducted on a Pb(II) lead solution with a working electrode comprising a carbon paste electrode derived from coconut shell charcoal. The sensitivity,repeatability, and linearity of the electrode were evaluated in the measurement of lead Pb(II) by the cyclic voltammetry method. This study was conducted with the objective of identifying the optimal electrode composition for the measurement of lead Pb(II) by cyclic voltammetry. Three variations of electrode composition were prepared, 6:4, 7:3, and 8:2, to ascertain the impact of electrode composition on the sensitivity of the measurement. The feasibility of carbon paste electrodes as a working electrode in the cyclic voltammetry method was evaluated by conducting experiments with variations in the concentration of lead pb(II) solutions, 1 ppm, 2 ppm, 4 ppm, and 8 ppm. The test results demonstrate that the composition of the carbon paste electrode influences the measurement outcomes. The optimal composition is 8:2, which produces the highest peak values of (Ipa) and (Ipc) currents compared to other electrode compositions. Additionally, carbon paste electrodes comprising coconut shell charcoal materials exhibit good repeatability and linearity values, meeting the established standards. As a result, the electrode can be deemed suitable for use as a working electrode in the electrochemical analysis method.
Analysis of the Subsurface Structure Using the HVSR Method in Jorong Air Putih Lima Puluh Kota Regency Afifah, Nurul
Journal of Experimental and Applied Physics Vol 3 No 3 (2025): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v3i3.129

Abstract

This study aims to analyze the subsurface structure and soil stability in the Jorong Air Putih area, Lima Puluh Kota Regency, West Sumatra Province, using the Horizontal to Vertical Spectral Ratio (HVSR) method. This area is known as a landslide-prone zone influenced by steep topography, complex geological conditions, and relatively high seismic activity. Therefore, understanding subsurface characteristics is crucial for geological disaster mitigation efforts and sustainable infrastructure planning. Data collection was conducted through microtremor surveys at 18 measurement points distributed across the study area. The data were analyzed using Easy HVSR software to calculate important seismic parameters, including the dominant frequency value , amplification factor , , seismic vulnerability index (Kg), and estimated shear wave velocity (Vs). The analysis results show that the dominant frequency values range from 0.4 Hz to 10.6 Hz, reflecting variations in the thickness and properties of subsurface layers, ranging from soft sediments to hard rocks. The measured amplification factor ranges from 1.22 to 3.20, indicating the potential for seismic wave amplification in certain soil layers. The seismic vulnerability index is mostly low, but there is one observation point showing moderate vulnerability, The shear wave velocity value.

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