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INDONESIA
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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Design and Development Of Inorganic Fertilizer Packaging System With Iot-Based Tally Counter Akmecia Risqa Apriani; Yohandri Yohandri
Journal of Experimental and Applied Physics Vol 1 No 1 (2023): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i1.1

Abstract

Inorganic fertilizers are fertilizers derived from chemical products produced by factories. This chemical, if inhaled, will seriously affect retail fertilizer sellers. Currently, sellers of diluted fertilizers still pack fertilizer manually, which takes a long time, as well as excessive labor and frequent fraud by employees against business owners and employees. The packaging system is engineering research aimed at determining the performance and design specifications of the system. The performance specification describes the performance of the packaging system, while the design specification describes the tool's sensor characteristics, accuracy, and precision. Data obtained through direct and indirect measurements. The direct measurement results are obtained from measuring the mass and detection distance of the packaging. In contrast, the indirect measurement results are obtained from the accuracy and precision of the tool. The results obtained on the system are performance specifications and tool design. The mechanical form of the device is obtained from the performance specifications. Then the system will detect the packaging that can be seen through the smartphone. The results obtained in this system are performance specifications and tool design. The mechanical form of the tool is obtained from the performance specifications. The system will measure the mass and detection distance of the packaging. The number of packaging can be seen through a smartphone. The accuracy of the packaging system to the mass is 99.82%, while the tool's accuracy to the mass is 99.52% which is obtained from the accuracy of measuring object 1.
Analysis of the Electrical Properties of Graphene Oxide from Bamboo Betung Synthesized by the Modified Hummers Method Reka Anisha Reza Putry; Ramli Ramli; Ratnawulan Ratnawulan; Rahmat Hidayat
Journal of Experimental and Applied Physics Vol 1 No 1 (2023): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i1.2

Abstract

The purpose of this study is to know the capacitance and conductivity  of graphene oxide made from betung bamboo. Betung bamboo was synthesized using modified hummers method. The carbonization procedure, which will be the control variable in this study, will be carried out in the first stage at four different temperatures for an hour: 300°C, 350°C, 400°C, and 450°C. The results are identified by the initials GO300, GO350, GO400, and GO450. The samples were then characterized using the XRD (X-Ray Diffraction), SEM (Scanning Electron Microscope), FTIR (Fourier Transform Infrared), and LCR Meter instruments. At a temperature of 400 °C, the LCR Meter measured the greatest conductivity and conductance values, with values of 5.43x10-6 S/cm for conductivity and 5.66x10-7 F/m2 for area capacitance. And according to the average conductivity and conductance values, this graphene oxide is situated in the region of semiconductor materials conductivity values.
Effect of Variations in Banana Frond Fiber Composition with Polyurethane Matrix on Composite Panels Acoustic Properties and Porosity Vini Oktavia; Yenni Darvina; Ramli Ramli; Rahmat Hidayat
Journal of Experimental and Applied Physics Vol 1 No 1 (2023): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i1.3

Abstract

Noise can damage one's health, affect one's comfort, cause stress, and make activities not run smoothly. Making acoustic materials is one of the efforts made to overcome noise pollution. The material used in this study comes from banana fiber with a polyurethane matrix. This research material is easily and widely available. The advantage of this study is to determine the effect of variations in the composition of banana stem fiber with a polyurethane matrix on the values of the sound reflection coefficient, sound absorption coefficient, sound transmission loss, and porosity. The method used is a hand lay-up with a single microphone tube impedance characterization tool and an analytical balance. In this study, variations in the composition of the composite panels with fiber and matrix variations were carried out, namely 60%:40%, 70%:30%, and 80%:20%. Based on the findings of this study, the higher the sound absorption coefficient, sound transmission loss, and porosity, the lower the sound reflection coefficient. If the frequency used is higher, the values of the sound absorption coefficient and transmission loss increase, while the reflection coefficient decreases for the entire frequency range. If the porosity is higher, the acoustic properties will be better, which is indicated by an increase in the value of the sound absorption coefficient and the value of the sound transmission loss. High porosity will comply with the ISO 11654:1997 standard.
Flood Early Warning System Using Ultrasonic and Rainfall Sensors IoT-Assisted with Smartphone Display Dhea Dinda Ramadhiani; Yulkifli Yulkifli
Journal of Experimental and Applied Physics Vol 1 No 1 (2023): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i1.4

Abstract

The increasing incidence of floods in Indonesia every year is in line with the losses they incur, thus requiring preventive measures such as an early warning system that is more effective than conventional systems. This early warning system uses Internet of Thing (IoT) technology which utilizes the internet so that information on potential floods can be accessed in real time on a smartphone and provides an alarm according to the potential for flooding obtained from two flood indicator data, namely rainfall and water level. This study uses NodeMCU ESP8266 as a microcontroller to read and process data from the ultrasonic HC-SR04 to detect water levels and tipping buckets to detect rainfall. The IoT system that is connected to the internet then reads and sends data that is processed by the microcontroller to be displayed on a smartphone via the Blynk application. Sensor testing was carried out by varying 10 data to obtain an average relative accuracy of 99.28% on ultrasonic and an average relative accuracy of 98.75% on tipping buckets. Overall, the system works well and provides accurate information if it is connected to the internet.
IoT-based Pyranometer Using Photodiode Sensor Wahyu Dewa Widiartha; Yohandri Yohandri
Journal of Experimental and Applied Physics Vol 1 No 1 (2023): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i1.5

Abstract

Solar irradiance is one of the critical parameters of climatology because it is the driver of most of the dynamic processes in the atmosphere. We need a tool to measure solar irradiance, such as a pyranometer. However, the pyranometer has the disadvantage that it requires cables and electricity to send data to data processing devices, which sometimes causes data loss problems if the connecting cable is damaged unnoticed and a sudden power outage occurs. An IoT-based pyranometer using a photodiode sensor will overcome this problem because the tool will send the measured solar irradiance data directly to the internet. The objective of this research is to minimize the measurement data loss that occurs and to ensure the data quality. This is possible because the device operates with solar cells that constantly recharge the battery. This research is a type of engineering research. The measurement technique used is a direct measurement, comparing solar irradiance data with a standard pyranometer, then indirectly analyzing the accuracy and precision of the design tool. Based on direct testing of the tool, an accuracy and precision rate close to 100% was achieved, which was 98.19% and 98.63%, respectively. Therefore, it can conclude that the tool can work well. Moreover, measurements were also conducted at BMKG Sicincin on July 13, 2022 from 08:56 to 15:10, resulting in a measurement percentage of 4.87% with the highest solar irradiance at 12:15.
Seismic Vulnerability Index Analysis In The Sub-District Of Lake Kembar, Solok Regency, As An Effort To Determine The Potential Aslided Area Using HVSR Method Ella Dwi Percindira; Syafriani Syafriani; Hamdi Hamdi; Letmi Dwiridal
Journal of Experimental and Applied Physics Vol 1 No 1 (2023): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i1.6

Abstract

Nagari Kampung Batu Dalam, Danau Kembar District, experienced a landslide caused by high rainfall and steep topography (slope). However, there needs to be more information regarding the classification of landslide potential levels that will occur. So it is essential to carry out this study to determine the soil type, sediment depth, and seismic vulnerability index. Ten microtremor data are scattered in this area. Measurements are carried out using an MAE Sysmatrack and 3D Seismic Surface Sensor, and this is done because these measurements are not difficult to carry out and do not require a large amount of money. However, there is an abundance of information that can be analyzed. Microtremor signal data were processed using Geopsy software with the Horizontal to Vertical Spatial Ratio (HVSR) method and soil profiles which stated the parameters of the shear wave velocity (Vs) and the depth of the sediment layer (H) using the ellipticity curve method. The results obtained show that the f0 value ranges from 0.6-4.37 Hz, the Amplification Factor ranges from 1.4-17.1, the sediment thickness (H) ranges from 24.5-240.8 m, and the seismic susceptibility index ranges from 1.72E-04 - 3.21E-02 cm/s2. Based on the mapping and modeling, it shows that alluvial rocks dominate the locations that have the potential for landslides.
Arduino-based Spectrometer Design for Measurement of Liquid Absorbance Yohandri Yohandri; Diah Rahmawati
Journal of Experimental and Applied Physics Vol 1 No 1 (2023): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i1.8

Abstract

The Spectrometer is an important common analytical equipment that measures the concentration of analytes via their absorbance of light at specific wavelengths. However, many laboratories with limited resources cannot afford such equipment. A Spectrometer utilizes the wavelength of the electromagnetic spectrum. The main component of the spectrometer is the sensor detector. The BH1750 sensor is used to detect the absorbance of the sample after being irradiation with a Light Emitting Diode Red Green Blue (LED RGB). If the RGB light irradiated the sample, the sensor will read the output value according to the Arduino Programming. This study used Congo red samples with various concentrations of 20, 30, 40, 50, and 60 ppm. the tool can be developed at low cost and the performance of the tool is highly satisfactory in terms of accuracy and precision.
Development of Regular Circle Motion Experiment System with Remote Laboratory Based IoT using Web Riwandha Asnan; Asrizal
Journal of Experimental and Applied Physics Vol 1 No 2 (2023): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i2.10

Abstract

Along with the development of Science and Technology, learning media is very diverse. Online learning resources are one of them. The utilization of the remote laboratory in education helps to improve instruction, particularly for experimental learning. The experimental system being built is anticipated to be able to provide reading results on the web, and it has a login system, a web-based queue system, and usage time limits. The Design and Development method is the method chosen in this study. The Design and Development technique is a systematic examination of the design, development, and assessment processes with the goal of establishing an empirical foundation for the development of new or improved models as well as instructional and non-instructional tools and products. The design and development process is described, examined, and assessed in this research as it relates to the tools and products that have been created. In general, this research aims to develop experiments of uniform circular motion using an internet-based remote laboratory. The accuracy value of the experimental system obtained was an average of 98.79% with an average error percentage of 1.21%. The accuracy value of the experimental system obtained is an average of 99.08%. Testing tools for experimental activities on the accuracy of measurement results on the web with manual measurements, obtained an average percentage of measurement errors on the web of 1.25% with an average accuracy of 98.75%.
Electronic Pad To Paragliding Landing Score System Based Internet Of Things (IOT) Venezia Ferly Wiranda; Yohandri
Journal of Experimental and Applied Physics Vol 1 No 2 (2023): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i2.11

Abstract

Advances in technology allow sports equipment to become more efficient, easier to use, and have more use value. One of the technological advancements in the field of paragliding is the existence of a tool that can measure paragliding accuracy scores without having to measure them manually. However, this tool is still difficult to obtain because the price is expensive and the diameter is still 22 cm, so if a paragliding athlete lands outside the tool it is still measured manually. Therefore, an Internet of Things (IoT) based electronic pad with a diameter of 100 cm was developed. This electronic pad is designed to use a push button as a detector to get a paragliding screening accuracy score and a Radio Frequency Identification (RFID) sensor is used to detect the identity code of the intended athlete. The output of the tool appears on Google Sheets and in the Android application to make it easier to record scores for the superior accuracy of paragliding athletes. The type of research used is engineered research, namely research that applies knowledge in the form of tool design or design. The direct result of the research is the measurement of the heart rate score and the identity code of the paragliding athlete and for the indirect measurement results in the form of the accuracy of the electronic pad device is 1 and the accuracy of the tool is 1. Based on the results of its accuracy and precision, this electronic pad tool is suitable for measuring landing accuracy scores and paragliding athlete identity codes.
Land Subsidence Analysis Using The DinSAR Method in Snap Application for The 2021 Periode Mairizwan; Hanifah Nur Ismail; Joko Widodo
Journal of Experimental and Applied Physics Vol 1 No 2 (2023): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i2.14

Abstract

Three main factors can accelerate the rate of land subsidence, including: natural conditions (geology), groundwater extraction and building mass. Excessive groundwater extraction is believed to be one of the main factors leading to land subsidence. This occurs because there are still many DKI Jakarta residents who have not switched to using PAM RT water (Household Drinking Water Management).  Data processing to obtain information in the form of the value of the range of subsidence of the DKI Jakarta area during 2021. The data taken in the form of Sentinel 1A data is then analyzed with the SNAP application using the Differential Interferometry Synthetic Aperture Radar (DInSAR) method. This research is useful to determine the rate of land subsidence in the DKI Jakarta area in 2021. Based on the results of data processing that has been done using the DInSAR method in the ESA SNAP application using Sentinel 1A imagery with data for the DKI Jakarta area in 2021, it can be concluded that for one year in 2021 the results of the decline in the area are -0.7 cm - -2.3 cm which is located near the Jakarta sea waters for one year in 2021.

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