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INDONESIA
Komunikasi Fisika Indonesia
Published by Universitas Riau
ISSN : 14122960     EISSN : 2579521X     DOI : 10.31258/jkfi
Core Subject : Science, Engineering,
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
KFI mempublikasikan artikel hasil penelitian dan review pada bidang fisika, namun tidak terbatas, yang meliputi fisika murni, geofisika, plasma, optik dan fotonik, instrumentasi, dan elektronika, dan fisika terapan (aplikasi fisika).
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 15 Documents
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Search results for , issue "Vol 21, No 2 (2024)" : 15 Documents clear
Designing a mosque charity box with voice recognition and GPS based on the internet of things Ainun Azizah; Masthura Masthura; Mulkan Iskandar Nasution
Indonesian Physics Communication Vol 21, No 2 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.2.171-174

Abstract

A security system for mosque donation boxes has been designed and built with the goal of developing a tool that can identify mosque charity box theft using the Internet of Things. The ATmega328P and ESP-32 microcontrollers are the two used in this device. Additionally, a GPS module, speech recognition, and an HC-SR04 ultrasonic sensor are included with this tool. This demonstrated that the Neo-6M GPS Module was used quite accurately with a distance difference of about 3 m. The test results from the GPS on the mosque's donation box obtained latitude and longitude points of 3.492006 and 98.587856, respectively, while the coordinate points on Google Maps were 3.491760 and 98.587943. The HC-SR04 ultrasonic sensor's purpose is to track movement in the Afterwards, a buzzer or early-warning alarm will ring, and Wi-Fi will notify the telegram application of the coordinates. This tool also includes a pretty contemporary voice recognition-based system for opening and closing donation boxes, which can accurately record, recognize, and detect sound.
Magnetic susceptibility, composition, and morphology of iron oxide particles resulting from ball milling of natural sand in the Rokan River Elfitah Ramadhani Triana; Salomo Salomo; Erwin Amiruddin; Rahmondia Nanda Setiadi
Indonesian Physics Communication Vol 21, No 2 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.2.121-126

Abstract

The magnetic susceptibility value and alterations in the composition and dimensions of iron oxide particles in the natural sand from the Rokan River, which were prepared using ball milling (BM), have been measured. Prior to undergoing the BM procedure, the sample's magnetic and non-magnetic particles are initially separated using an iron sand separator and a neodymium iron boron magnet. Subsequently, a 120-gram sample was obtained and subjected to the initial stage of BM for a duration of 80 hours, resulting in the formation of a product referred to as BM1. Next, product BM1 undergoes a second stage of BM with an extended duration of 30, 40, and 50 hours. The resulting products are termed BM2A, BM2B, and BM2C, respectively. The milled balls utilised were a total of 16 combined iron balls with a diameter of 2 cm, 32 combined iron balls with a diameter of 1.5 cm, and 64 combined iron balls with a diameter of 0.7 cm. The findings indicated a positive correlation between the duration of BM rotation and the magnetic susceptibility value. Specifically, the value increased from 11,361.6 in BM1 to 12,398.7 in BM2A, 13,383.4 in BMB, and 14,541.2 in BM2C. The XRF test findings also indicated an increase in the fraction of the magnetic element, Fe, from 38.113% in BM1 to 40.133% in BMA, 41.629% in BM2B, and 42.478% in BM2C. The SEM test findings indicated a decrease in the average particle size of the samples from 696 nm to 401, 356, and 288 nm.
Application of solar panels in IoT-based bird pest control tools Fitri Harahap; Nazaruddin Nasution; Mulkan Iskandar Nasution
Indonesian Physics Communication Vol 21, No 2 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.2.149-154

Abstract

The use of solar panels in bird pest control equipment in the rice field zone is based on the internet of things (IoT), which aims to create bird pest control equipment for farmers. This control system is equipped with a PIR sensor whose role is to determine the presence of birds in the rice field zone. The distance range when a bird is found is 5 meters, and an ultrasonic speaker will be active when there is bird movement in the rice field. This speaker uses an ultrasonic wave frequency of 20 kHz. RTC testing is used as a timer to reset the number of invasions in 1 × 24-hour intervals at 00.00 WIB. Next, there is a test of sending (transmitter) and receiving (receiver) LoRa material information near ± 450 meters, information to be sent and placed on the dashboard things board.
Literature study of the influence of exposure factors on receiving radiation doses in radiographic examinations Novia Anita
Indonesian Physics Communication Vol 21, No 2 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.2.175-178

Abstract

High tube voltage with reduced tube current and exposure time can reduce the dose received by the patient. Based on the principle of optimizing radiation protection and safety, efforts are needed to minimize patient doses in such a way that it still allows for obtaining the necessary diagnostic information. The aim of this study is to investigate whether high tube voltage and lower exposure time can minimize the radiation dose received by patients. This study used a literature review method as the basis for research planning. Literature review involves searching and analyzing various sources of information such as books, journals, and relevant publications to understand the research topic. The research findings indicate that high tube voltage and lower exposure time can minimize the radiation dose received by patients. Therefore, understanding the role of technical factors in radiation dose settings is crucial for medical operators performing X-ray examinations. By selecting the appropriate kVp and mAs settings, it is possible to ensure minimal exposure dose.
Utilization of young coconut fiber activated carbon with pre-carbonization variations as a supercapacitor electrode Winda Nofriyanti; Awitdrus Awitdrus
Indonesian Physics Communication Vol 21, No 2 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.2.127-130

Abstract

A supercapacitor is an electrochemical device that integrates power supply and charge storage capabilities.  The primary constituents of a supercapacitor consist of electrodes, separator, electrolyte, and current collector. This work focuses on the production of carbon electrodes using coconut fibre biomass waste. The carbonisation process is carried out at three different temperatures: 200ºC, 225ºC, and 250ºC. The resulting samples are labelled as SC-200, SC-225, and SC-250, respectively. The production of Carbon electrodes involves multiple procedures, including pre-carbonization, chemical activation using a ZnCl2 activator at a concentration of 0.5 M, followed by carbonisation using N2 gas at a temperature of 600ºC, and physical activation using CO2 gas at a temperature of 750ºC. The mass reduces by 23.01%, 27%, and 36.51% following pre-carbonization. The sample with the greatest density value is SC-225, which has a mass loss percentage of 41.66%. The results of cyclic voltammetry indicate that the SC-225 supercapacitor cell has the maximum capacitance value of 199.82 F/g. To summarise, the SC-225 temperature can function as an activated carbon electrode that enhances the performance of the supercapacitor electrode.
Reducing free fatty acid and peroxide levels in refining used cooking oil made from activated carbon from Barangan banana peels Dian Frasisca; Ety Jumiati; Masthura Masthura
Indonesian Physics Communication Vol 21, No 2 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.2.155-158

Abstract

Everyday life requires a food processing component known as cooking oil. Repeated use of cooking oil can reduce its quality and cause it to have high levels of free fatty acids and peroxides. The purpose of this study was to find out how to purify cooking oil using activated carbon made from Barangan banana peels to reduce the amount of free fatty acids and peroxide value. The activated carbon samples used in this study were sample A (5.5 g), sample B (10.5 g), and sample C (15.5 g). Sample C with 15.5 g of activated carbon had a free fatty acid test result of 0.16% and a peroxide number of 3.91 mek O2/kg which was the best result in this study, and was in accordance with SNI 01-7709-2019.
Production of activated charcoal from sugarcane bagasse using physical activation Mella Yolanda Alfika; Ety Jumiati; Miftahul Husnah
Indonesian Physics Communication Vol 21, No 2 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.2.179-182

Abstract

Activated carbon is a material containing 85% – 95% carbon elements and is a porous solid. This activated carbon is the result of heating materials containing carbon at high temperatures but not oxidized. In this study, the material used is sugarcane bagasse, and its activator is NaOH. The purpose of this research is to examine the production of Activated Carbon from Sugarcane Bagasse with different concentrations of NaOH activator, analyze the moisture content, ash content, volatile matter content, and fixed carbon content. Carbonization is carried out using a furnace at a temperature of 500°C for 1 hour. Carbon activation is done using NaOH solution with concentrations of 0.3%, 0.5%, and 0.7%. Irradiation is done using a microwave with a power of 630 Watts for 20 minutes. The results of this study indicate that the NaOH concentration affects some characteristics of the activated charcoal produced from sugarcane bagasse. A NaOH concentration of 0.7% produces activated charcoal with the best characteristics, with a moisture content of 3.1%, volatile matter content of 20.4%, total ash content of 5.9%, and carbon content of 62.2%.
Earthquake vulnerability mapping based on probabilistic seismic hazard analysis (PSHA) in the Nias Islands, Indonesia Astri Angraeni; Lailatul Husna Lubis; Ratni Sirait; Reinhard Sipayung
Indonesian Physics Communication Vol 21, No 2 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.2.131-136

Abstract

The Nias Islands are categorised as seismically active, making them susceptible to earthquakes. The Nias Islands region is situated on the ring of fire and a subduction line that experiences annual movement, which is the primary factor contributing to its susceptibility to earthquakes. The occurrence of earthquakes in the Nias Islands is supported by a documented record of 7,152 incidents with a magnitude strength more than 4 Mw from 1910 to 2022, indicating a 500-year return period. In order to assess the susceptibility of the Nias Islands region to earthquakes, a process called earthquake vulnerability mapping is conducted. This involves utilising the probabilistic seismic hazard analysis (PSHA) approach to calculate the peak ground acceleration value.  The investigation commences with gathering seismic events within the study region from the IRIS and BMKG catalogues. The earthquake data was subsequently transformed from magnitude to Mw (magnitude moment), and then de-clustered to isolate the primary event from the entire dataset of earthquakes. First, the a-value and b-value are calculated in order to identify the background earthquake source. Then, PSHA processing is conducted to calculate the spectral acceleration value for each predefined grid. The processing findings indicate that the peak ground acceleration (PGA) value at time 0 s ranges from 0.05 – 1.2 g, the PGA value at time 0.2 s ranges from 1 – 1.2 g, and the PGA value at time 1 s ranges from 0.4 – 0.5 g.
Design of a coffee bean dryer prototype based on the internet of things Ardian Afandi; Masthura Masthura; Nazaruddin Nasution
Indonesian Physics Communication Vol 21, No 2 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.2.159-164

Abstract

Coffee is one of the plants that is widely cultivated in tropical countries such as Indonesia. Coffee plantation commodities at least contribute a lot to the Indonesian economy, which creates foreign exchange, farmer income, industrial raw materials, employment, and regional development. This research aims to design coffee bean dryer equipment using a heater as a heating element instead of sunlight for the process of drying coffee beans. When the temperature has reached 60°C, the heater will turn off briefly, and if the set time has not expired, the heater will always be alive. If the humidity does not decrease, the fan will fail. In this research, using experimental research procedures where each measurement is used effectively by each sensor so that the measurement results of each sensor are accurate. From the test results, it can be concluded that the initial weight before drying was 1000 grams, while the weight after drying was 880 grams.
Analysis of pressure distribution in cylindrical tube fluid flow using a fiber Bragg grating Annisa Ratna Pertiwi; Saktioto Saktioto; Bambang Widiyatmoko; Dwi Hanto
Indonesian Physics Communication Vol 21, No 2 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.2.109-114

Abstract

Fibre optic sensors have garnered considerable attention from scientists, leading to the extensive use of optical fibres as sensors for monitoring strain and temperature. The increasing adoption of fibre Bragg gratings (FBG) can be attributed to their enhanced sensitivity and rapid transmission speed. The objective of this study is to examine the pressure distribution of FBGs within a cylindrical tube while subjected to vibrations from a loudspeaker and the presence of hot water vapour. The given options were of two scenarios, first scenario had a tube without water vapour and a heart sound, while the second scenario included a tube with water vapour and a heart sound. In this experiment, we strategically placed the FBG at 20 different points along the cylindrical tube to accurately detect strain values at each position. The outcomes derived from these two scenarios illustrate that temperature and air vapour pressure exert an influence on the occurrence of sound, with the highest level of tension found when hot water vapour and heart sounds are present.

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