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Mona Berlian Sari
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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 9 Documents
 1 
Search results for , issue "Vol 1 No 2 (2023): September Edition" : 9 Documents clear
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.
Analysis of Extreme Rainfall in Padang City Based on The Influence of MJO and IOD in The Period 1991-2020 Cindy Magriza Putri; Nofi Yendri Sudiar; Hamdi; Letmi Dwiridal
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.v1i2.15

Abstract

Rainfall above normal can be categorized as extreme rainfall. Extreme rainfall can be caused by various factors, such as global, local, and regional factors. Some regional factors that influence rainfall are the Madden Julian Oscillation (MJO) and the Indian Ocean Dipole (IOD). Padang City has high rainfall intensity which can result in extreme rainfall. The lack of adequate disaster mitigation results in flood disasters when extreme rainfall occurs. Therefore, this research aims to determine normal rainfall, extreme rainfall trends and the relationship between the MJO and IOD phenomena with the frequency of extreme rainfall in Padang City. This information is needed for future disaster mitigation planning. The method used is the time series method and statistical correlation test. Based on the results of the analysis, it is known that Padang City is an area with an equatorial rain type, where the highest rainfall occurs in November with a value of 512 mm and the lowest in May with a value of 268 mm. The trend in extreme rainfall tends to decrease with regression coefficient values ​​of 0.0412 and 0.0708. There is a significant relationship between the number of negative IOD events and the frequency of extreme rainfall with a correlation coefficient of 0.483 and 0.403 which indicates a moderate correlation. There is no significant correlation between the number of strong MJO events in Phases 3 and 4 and the frequency of extreme rainfall, with a correlation coefficient of -0.038 – 0.105.
Synthesis of Hydroxyapatite From Egg Shells Using Precipitation Methods For Bone Implant Application Veni Wahyuni; Riri Jonuarti; Ratnawulan; Rahmat Hidayat
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.v1i2.16

Abstract

Patients with fractures continue to increase from year to year. So that the need for biomaterials is very high and has had a considerable impact, especially in the field of orthopedic medicine. Hydroxyapatite (HAp) is one of the suitable biomaterials for bone implants. Hydroxyapatite (HAp) with the chemical formula C10(PO4)6O2H2 is a calcium phosphate that contains hydroxide, which is classified as a mineral in the apatite group. HAp can be obtained from natural waste such as the eggshells of a chicken. This is because chicken eggshells have a very high CaO content (98,43%) which serves as a precursor in the synthesis of HAp. The purpose of this research the aim of observing the effect of stirring time on the purity of the HAp produced and to see the optimum stirring time used to produce good HAp. In this study, HAp was synthesized using a precipitation method by varying the stirring time. Based on variations in stirring time of 1 hour, 2 hours, 3 hours, 4 hours, and 5 hours, the purity of HAp obtained was 15%, 49%, 66%, 82%, and 50%, respectively. Therefore, it was concluded that the optimal stirring time to produce HAp with the highest purity is at a time interval of 4 hours.
Analysis Of Changes In Seismic Rate (Seismic Rate Change) Based On Seismotektonic Spatial Distribution Of Bengkulu Area Fadhil Ramadhani; Syafriani; Hamdi; Letmi Dwiridal
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.v1i2.17

Abstract

Bengkulu Province has a high level of seismicity with significant earthquakes preceded by the phenomenon of decreased seismic activity (seismic quiescence) which can be seen through observing changes in seismic rate in an area based on the spatial distribution of z values. This study uses data from the USGS website for the period 1925-2021 to study seismic rates changes based on the spatial distribution of z values. In this study there are seven research focus zones, five major earthquake zones 1934 (7.0 SR), 1943 (7.0 SR), 2000 (7.0 SR), 2001 (7.0 SR), 2007 (7.7 SR), as well as two seismic activity zones with coordinates -5.6° to -4° south latitude and 101.6° to 103.4° east longitude and a seismic gap zone with coordinates –4.2° to -2.5° South latitude and 102.6° to 104.5° East longitude. The observation result show that before the earthquake occurred in the period 1925-2021, Before the earthquake, there had been a seismic quiescence phenomena. Four years before 2021, the seismic quiescence phenomena occurs in high seismic activity zones., while the seismic gap area occurs seven years before 2021. Overall, the seismic activity analysis result in Bengkulu province area shows an increase and decrease in seismic activity simultaneously in several different areas. This should be suspected of being the beginning of a significant earthquake in the future.
Effect of Addition of Seaweed (Sargassum sp.) Charcoal with Pure Graphite on the Microstructure of Graphene Oxide Synthesized by the Modified Hummer’s Method Gebby Wevi Angraini; Ramli
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.v1i2.18

Abstract

Graphite acts as a source of carbon which is used in the synthesis of graphene oxide. Graphite has a fairly high price, so there are limitations to the use of graphite on a large scale. Brown sea grass (Sargassum sp.) contains carbon and is not yet well exploited in Indonesia, so experiments can be done by mixing graphite and Sargassum sp. to minimize excessive use of graphite. The purpose of this study is to determine the addition of Sargassum sp. charcoal could affect the microstructure of graphene oxide synthesized using the modified Hummer method. Where a comparison of 5 variations of the composition of pure graphite and Sargassum sp. charcoal was carried out, namely (100:0; 70:30; 60:40; 50:50, and 0:100) %. The resulting graphene oxide was characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR), and Scanning Electron Microscope (SEM). It can be concluded that the addition of Sargassum sp. charcoal to pure graphite influences the microstructure of the graphene oxide. In the XRD test, an average crystal size of 24-33 nm with a cubic crystal structure was obtained; in the FTIR test, there was a bond between carbon (C), hydrogen (H), and oxygen (O); and in the SEM test, the average particle size was 1647–1887 nm. If 30% Sargassum sp. charcoal is added to 70% pure graphite, the larger the particle size. This causes the surface pores to become larger so that their properties as supercapacitors are better produced and have structures that tend to be like pieces.
Analysis of Optical Properties of Graphene Oxide from Bamboo Petung (Dendrocalamus Asper) Synthesized by Modified Hummer Method Indah Safira; Ramli; Yenni Darvina; Fadhila Ulfa Jhora
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.v1i2.20

Abstract

Carbon, hydrogen and oxygen are abundant in the structure of graphene oxide (GO), often known as graphene. In this study, petung bamboo was used in the manufacture of graphene oxide. The aim of this research is to find out how the sintering temperature influences the ability of graphene oxide to absorb waves. The modified hummer method is used to oxidize graphite and produce Graphene Oxide. This research was divided into several parts, namely burning carbonized petung bamboo, production of graphene oxide, and sonication and neutralization of graphene oxide using sintering temperatures of 300°C, 350°C, 400°C and 450°C. The synthesis results were characterized using a UV-Vis spectrometer to obtain an absorption spectrum resulting in a band gap of 2.68 eV-4.38 eV in Petung bamboo at a sintering temperature of 300oC - 400oC, the bandgap increasing as the sintering temperature increased. At a sintering temperature of 400oC - 450oC the band gap value decreases which is influenced by the results of cell changes from refinement which can change the band structure thereby affecting the size of the band gap. The absorption value obtained in the optical properties decreases because the high sintering temperature causes the reaction rate to become faster so that the absorption value becomes lower.
Design and Construction of Air Quality Monitoring System using NodeMCU IoT-Based Vivi Wulandari; 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.v1i2.23

Abstract

Air as a natural resource affects human life and other natural resources. Air consists of about 78% Nitrogen, 20% Oxygen, 1.07% consists of Neon (Ne), Helium (He), Methane (CH4) and Hydrogen (H2), 0.9% Argon and the remaining 0.03% Carbon Dioxide (CO2). This research is a type of engineering research. Data collection was carried out by direct measurement. For direct data collection, it was carried out by monitoring levels of CO2, CO, temperature, and humidity, for data collection from each parameter, 5 variations were given for measurement. Based on the objectives of the research, the results of the design specifications of the tool are obtained, namely the percentage level of accuracy of the average measurement produced by air quality monitoring which is 97.78%, the average percentage of relative error obtained is 2.24%. Therefore, it can be concluded that the specifications for the performance of the tool are that the components that make up the tool can work well.  

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