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Usman Malik
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Jurusan FMIPA Universitas Riau Kampus Bina Widya Km 12,5 Simpang Baru Pekanbaru
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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 390 Documents
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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.
Identify coal distribution based on resistivity values using the Wenner configuration geoelectric method in Petai Village, Singingi Hilir District, Kuantan Singingi Regency Hijrah Septia Anisa; Usman Malik; Krisman Sabar; Sherly Mutiara
Indonesian Physics Communication Vol 21, No 1 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.1.73-78

Abstract

Research has been conducted on the distribution of coal using the Wenner configuration electric resistivity method. This research was conducted in Petai Village, Singingi Hilir District, Kuantan Singingi Regency, Riau Province. Data were collected using a resistivity meter. The data obtained are current data and potential differences. Data processing using Res2Dinv software whose result is in the form of resistivity of subsurface 2D images. The resistivity value of rocks on track 1 ranges from 28 – 23,584 Ωm with a depth of up to 12.4 meters. The resulting layers on track one include sand, sandstone, and conglomerate rocks. The resistivity values of the second trajectory range from 12.2 – 17,447 Ωm with a depth of up to 12.4 meters. The first layer has resistivity values ranging from 12.2 – 97.4 Ωm identifying the presence of sand. A second layer with resistivity values ranging from 97.4 – 275 Ωm identified the presence of anthracite-grade coal. A third layer with a resistivity value of 776 – 2,191 Ωm identified the presence of sandstone. A fourth layer with resistivity values 6,182 – 17,447 Ωm identified the presence of conglomerate rocks. The result of the interpretation of tracks one and two is that the distribution of coal is found on the second trajectory with a distribution pattern to the east.  The distribution of coal spreads laterally on the trajectory of two research sites.
PEMANFAATAN LIMBAH SERABUT KELAPA MUDA SEBAGAI ELEKTRODA KARBON SUPERKAPASITOR DENGAN VARIASI KONSENTRASI AKTIVATOR ZnCl2 Ridho Nopriansyah; Awitdrus Awitdrus
Indonesian Physics Communication Vol 20, No 3 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.3.301-305

Abstract

The chemical activation method is a simple and low-cost activation method that can modify the surface morphology associated with improving the electrochemical properties of supercapacitor cell electrodes. The porous carbon framework was derived from young coconut fiber biomass by optimizing the chemical activation reagent (ZnCl2). Carbon material derived from coconut fiber is a biomass for the application of supercapacitor cell electrodes through the pre-carbonization stage at 200°C for 1 hour 30 minutes, chemical activation using the activating agent ZnCl2 with various concentrations of 0.1, 0.3, and 0.5 M, the carbonization process uses gas N2 with a temperature of 600°C and physical activation using CO2 gas with a temperature of 750°C. The optimum concentration of young coconut fiber-based carbon electrodes is found at a concentration of 0.5 M, which has the highest density shrinkage percentage of 53.11%. X-ray diffraction analysis showed that the sample at a concentration of 0.5 M was amorphous with two wider diffraction angle of 2q at an angle of 24.867° and 44.556°, with the lowest Lc/La ratio of 0.3 and an average microcrystalline layer of 2.3. Analysis of electrochemical properties showed that samples at a concentration of 0.5 M has an optimum specific capacitance of 81.84 F/g in the CV.
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.
Analysis of temperature patterns in Pekanbaru City using fractals and artificial neural networks based on monthly temperature data Reynal Nur Razzaq; Defrianto Defrianto
Indonesian Physics Communication Vol 21, No 1 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.1.79-90

Abstract

Climate and global warming play a crucial role in the lives of living organisms on Earth. Temperature, varying in each region, is a vital aspect in climate observation. This study analyzed temperature fluctuations in Pekanbaru from 2016 to 2022 using fractal analysis and backpropagation artificial neural networks. The research findings revealed that temperature prediction with backpropagation artificial neural networks was quite accurate. However, errors during testing or validation could impact the comparison with the target values. Fractal analysis indicated a persistent tendency in temperature fluctuations in Pekanbaru, with a Hurst exponent of 0.7993 and a fractal dimension of 1.2007. Nevertheless, temperature fluctuations were also influenced by other factors, leading to varying levels of stability over certain periods. Thus, the temperature in Pekanbaru can be considered a complex system with diverse fluctuation patterns and varying levels of complexity.
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.
Laser as a tool to measure the diameter of goat hair (Capra aegagrus hircus) Rani Rahmawati; Widi Komariah; Helmina Pebriyanti; Dedeh Sukmawati; Siti Rusmiati; Retno Nopita; Eko Sujarwanto
Indonesian Physics Communication Vol 21, No 1 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.1.1-6

Abstract

Measuring the diameter of objects that have dimensions less than 1/100 mm has a high degree of difficulty. The use of a micrometer is still not able to make these measurements. One way that can be used is to use the concept of diffraction. The purpose of this study was to measure the diameter of goat hair using the concept of diffraction. The tools used are a laser with a red wavelength, a screen, support, and specimens of goat hair. Measurements were taken three times with results of 13.9 × 10-5, 11 × 10-5, and 8 × 10-5 m. The diameter values obtained from this experiment are still within the diameter range of mammalian hair, which is on the order of 10-5 m. Based on this experimental activity, it can also be seen that hair can be used to demonstrate the phenomenon of diffraction due to the characteristics of hair being filamentous and has a diameter close to the wavelength of light from a laser, so that it can produce a diffraction pattern when light is passed through the laser.
Effect of calorific value on the burning rate of coconut shell briquettes and teak wood powder Nur Aisah Sagala; Ety Jumiati; Ridwan Yusuf Lubis
Indonesian Physics Communication Vol 21, No 1 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.1.41-44

Abstract

Biomass energy can be utilized inside, particularly in coconut shells with pine gum and teak sawdust as an elective fuel that is harmless to the ecosystem. To deliver charcoal briquettes from teak wood sawdust and coconut shells, this study endeavored to decide the qualities, impacts, and structure of varieties in pine tar cement. Pine resin adhesive is mixed with teak sawdust and coconut shells in a ratio of 80% to 20%, with variations of 30%, 40%, and 50%. For briquettes, utilize a size of 5 × 5 × 5 cm3. The aftereffects of the briquette test which delivered ideal qualities were gotten in example C with a warming worth of 31.073l J/gram and a consuming pace of 1,3697 g/minute according to SNI-01-6235-2000 and close to standard.

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