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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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PENGGUNAAN PEMODELAN SUMBER PLASMA HELIUM PADA KEADAAN SETIMBANG UNTUK APLIKASI PLAK GIGI Nandita Devira; Toto Saktioto
Komunikasi Fisika Indonesia Vol 19, No 1 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.1.11-18

Abstract

Helium plasma source modelling was performed in order to obtain species density at balanced conditions under pressure of 1 atm. The software used in this modelling is matrix laboratory software (MATLAB). The equation used is a continuity equation that depends on the position and parameters of Arrhenius. Plasma temperatures used were 0.1 eV, 0.2 eV, 0.3 eV, and 0.5 eV. Species involved in a plasma consist of electrons, He, He+, He2+, He*, and He2*. The modelling results showed that the density value of He species increases as temperature increases. It is noted that the obtained the density of He (nHe) when reaching a balanced condition at the temperature  of T = 0.1, 0.2, 0.3, and 0.5 are 3.0137 × 1025, 7.9506 × 1026, nHe = 1.6489 × 1028, and 7.1384 × 1029, respectively. This is because He is a noble gas that is monatomic and chemically inert. Thus resulting in stable plasma production and gaining an increase in density value. Plasma-charged species are the main media that cause the disinfection of microorganisms because they can break the hydrogen bond of the organic molecules that make up the dental plaque. So the influence of charged species when applied to dental plaque has more effective than that of neutral reactive species.
ANALISA DISTRIBUSI DOSIS PADA FANTOM HOMOGEN DAN INHOMOGEN DENGAN SIMULASI MONTE CARLO Sitti Yani
Komunikasi Fisika Indonesia Vol 19, No 1 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.1.39-44

Abstract

Monte Carlo simulation with electron gamma shower (EGSnrc) code can produce 3-dimensional dose distribution data. The percent depth dose curve (PDD), dose profile, and isodose curve can be extracted through this 3-dimensional data. In this study, a photon source with an energy of 2 MeV is placed at the source to surface distance (SSD) from the phantom surface by adjusting the collimator aperture which is used to control the size of the exposure field. The SSD distance was varied at a distance of 50 cm, 70 cm, 80 cm, 90 cm, and 100 cm. The size of the exposure area is also varied by 2 × 2 cm2, 5 × 5 cm2, 7 × 7 cm2, and 10 × 10 cm2. The dose distribution analysis was carried out on homogeneous phantoms containing water and inhomogeneous phantoms containing tissue/bone/lung/bone/tissue material. The PDD curve and dose profile represent dose changes with depth and x or y direction, respectively. The PDD curve on a homogeneous phantom shows an increase in the value on the surface of the phantom to the depth with the maximum dose. This curve then decreases gradually with increasing depth. Inhomogeneous ghosts show spikes in the border region of the two media with different densities. This is due to the contribution of the backscattered electrons generated by the bone media and into the tissue media. This phenomenon is also seen in the isodose curve for inhomogeneous phantoms.
SIKLIS VOLTAMETRI SEL SUPERKAPASITOR DARI BIOMASSA PELEPAH SALAK Rakhmawati Farma; Amalia Apriliani Putri; Irma Apriyani
Komunikasi Fisika Indonesia Vol 19, No 1 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.1.19-24

Abstract

Snake fruit midrib (SFM) biomass has the potential to be used as a precursor material for making carbon electrodes because it has a high lignocellulosic content for supercapacitor applications. Carbon electrodes were made from snake fruit midrib biomass using a pre-carbonization process at 200 °C, chemical activation with 0.1 M KOH as an activating agent, a carbonization process with temperature variations of 500 °C, 600 °C, and 700 °C using N2 gas, and a physical activation process at 800 °C with CO2 gas. Thermogravimetric analysis shows the thermal resistance temperature of carbon powder is 317.1 °C. Analysis of the electrochemical properties of supercapacitor cells from snake fruit midrib obtained specific capacitance values of 123.23 F/g, 169.05 F/g, and 213.27 F/g for samples SFM-500, SFM-600, and SFM-700, respectively. The results showed that 700 °C was the best carbonization temperature for carbon electrodes from snake fruit midrib.
PEMBUATAN ELEKTRODA KARBON DARI BIOMASSA SABUT KELAPA MUDA DENGAN AKTIVATOR KOH SEBAGAI APLIKASI SEL SUPERKAPASITOR Zurya Hanifa; Awitdrus Awitdrus
Komunikasi Fisika Indonesia Vol 19, No 1 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.1.45-50

Abstract

The supercapacitor is a storage device consisting of carbon electrodes, separator, electrolyte, and current collector. Carbon electrodes made from young coconut coir biomass with a mass ratio of 1:0.20 KOH activator have been successfully fabricated with a carbonization temperature of 550 °C and a physical activation temperature of 750 °C. Characterization of physical properties by measuring the density value showed that before and after pyrolysis decreased due to KOH activating agent. Furthermore, the electrochemical characterization using the voltammetry cyclic method showed the specific capacitance value to the scanning rate, where the highest specific capacitance value was 163.14 F/g with a scanning rate of 1 mV/s.
BATAS MEDAN LEMAH PADA GRAVITASI f(T) Tika Restianingsih
Komunikasi Fisika Indonesia Vol 19, No 1 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.1.25-30

Abstract

We derive the field equation of f(T) gravity at the weak field limit obtained by teleparallel Lagrange action of a function of torsion scalar T. The weak field limit in teleparallel gravity is to assume that tetrad experiences small perturbation and ignore the higher order. Tetrad perturbation is equivalent to metric perturbation in general relativity and can be transformed into one another. If we take the special case f(T) = T then the equation will be equivalent to the gravitational field equation obtained by the Einstein-Hilbert action. The equation of fields is simplified using the trace reversed method for metric perturbation and Lorentz gauge condition. The final equation has the form of the wave equation with an additional derivative of function f(T). Technically, this equation is the gravitational waves equation in terms of f(T) gravity. In a vacuum with zero energy and momentum tensor, the field equation reduces to the gravitational waves equation in a vacuum.
POTENSI DAUN JAHE MERAH SEBAGAI BAHAN DASAR PEMBUATAN ELEKTRODA SUPERKAPASITOR Erman Taer; Juwita Ade Putri; Novi Yanti; Apriwandi Apriwandi; Rika Taslim
Komunikasi Fisika Indonesia Vol 19, No 2 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.2.119-127

Abstract

Red ginger leaf waste (Zingiber Officinale Var Rubrum) has been successfully processed as an active carbon base material for supercapacitor electrodes. The process of making carbon electrodes starts from the preparation of the original material, drying, refining, chemical activation, integrated pyrolysis and neutralization. The focus of this research is on the chemical activator ZnCl2 which is used with different concentrations of (0.1 and 0.5) M. Activated carbon powder is printed using a press to produce carbon in the form of solid coins of uniform size. The optimization of the carbon element in the sample is carried out through a pyrolysis process at high temperature with a one-stage integrated technique. Where, carbonization in the N2 gas environment is carried out starting from room temperature 30°C up to 600°C followed by physical activation until the high temperature reaches 800°C in CO2 gas environment. Characterization of activated carbon samples from red ginger leaves begins with determining the amount of shrinkage that occurs in the pyrolysis process by measuring the mass, diameter and thickness of the carbon coins. Furthermore, the electrochemical properties were tested using two methods, namely cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) in a symmetrical two-electrode system. The electrochemical characterization was carried out under the influence of an aqueous electrolyte of 1M KOH and 1M Na2SO4 at a low potential window of 0-1 V. The optimum conditions of electrochemical properties were found in the red ginger leaf activated carbon sample with a ZnCl2 activator concentration of 0.5M for the electrolyte. KOH with a specific capacitance value of 115.9 F/g. while for electrolyte Na2SO4 found in ZnCl2 activator 0.1M with a value of 72 F/g. Through these results, red ginger leaves are known to have great potential as a base material for activated carbon electrodes to improve the performance of supercapacitors.
ANALISIS PENGARUH SUHU TERHADAP SENSITIVITAS SENSOR PADA HIDUNG ELEKTRONIK UNTUK KEMATANGAN BUAH KELAPA SAWIT Minarni Shiddiq; Dian Eka Rachmawati
Komunikasi Fisika Indonesia Vol 19, No 2 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.2.57-64

Abstract

Electronic noses have been developed for decades in many fields. Recently, electronic nose has been used in agriculture to detect the ripeness of fruits because fruits also produce volatile gas during ripening. Oil palm fresh fruit bunches (FFB) is the main source of crude palm oil, its quality depends on the ripeness levels of oil palm FFB. Therefore, electronic detections of oil palm FFB ripeness need to be developed. This study was aimed to investigate the effect of temperature variation on the sensitivity of gas sensors in an electronic nose designed for detecting the ripeness of oil palm FFB. The electronic nose used in this study consisted of 4 sensors which were TGS 2611, TGS 2620, TGS 813 and TGS 822. Samples were peeled fruitlets of ripe oil palm FFB which were heated to temperatures of 30°C, 45°C, and 60°C. Response of each sensor was represented as a trapezoid area of voltage versus time for convenience. The results showed that there was a significant difference in the output voltage of each sensor when the sample temperatures were varied. Fruitlets of oil palm FFB heated at 60°C resulted in higher trapezoid area which mean more volatile gas released.  Based on the resulted trapezoid area for each sensor. Sensors of TGS 2611 and TGS 822 are the most sensitive which have higher trapezoid area for the variation of the temperatures.
SINTESIS DAN KARAKTERISASI NANOPARTIKEL OKSIDA BESI MENGGUNAKAN METODE BALL MILLING DAN KOPRESIPITASI Riduan Alvinsen Sirait; Salomo Salomo; Juandi Muhammad; Erman Taer
Komunikasi Fisika Indonesia Vol 19, No 2 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.2.91-98

Abstract

This Research has carried out on natural sand originating from the Rokan river, Riau Province by converting it into magnetic iron oxide nanoparticles to determine changes in magnetic properties and particle size. Natural sand samples of the Rokan river were separated between magnetic and non-magnetic particles using an iron sand separator (ISS). ISS products are further synthesized using ball milling and coprecipitation methods. 70-hour ball milling products, coprecipitation without ball milling and coprecipitation with 70-hour ball milling are then given NdFeB (neodymium iron boron) magnets to clean impurities containing non-magnetic elements. The results of this study showed that the highest magnetic acceptability value was obtained in coprecipitation products with ball milling, which was 12.9 × 10-2. This is because coprecipitation products have an abundant content of chemicals in the form of magnetic elements. Based on the results of chemical composition testing using X-ray flourescence (XRF) it was found that in coprecipitation products with ball milling there was 64.504% iron (Fe) content, while 70-hour ball milling products and coprecipitation without ball milling the percentage of Fe protection was 15.023% and 54.152%, respectively. Based on the results of the identification of the chemical composition in the sample, coprecipitation products with 70-hour ball milling have high magnetic induction values and magnetic suseptibility caused by the magnetic content in products such as Fe which are very high and non-magnetic content is very low such as Si compared to 70-hour ball milling products and coprecipitation products without ball milling.
FABRIKASI ELEKTRODA KARBON DARI SABUT KELAPA MUDA DENGAN AKTIVASI FISIKA SEBAGAI APLIKASI SUPERKAPASITOR Martha Theresia Simanjuntak; Awitdrus Awitdrus
Komunikasi Fisika Indonesia Vol 19, No 2 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.2.65-68

Abstract

Supercapacitors areenergy storage devices consisting of electrodes, electrolytes, current collectors, and separators. Supercapacitor cells have components called electrodes. In this study, the basic material used to make supercapacitor cell electrodes is young coconut fiber with variations in physical activation temperature of 700°C, 750°C and 800°C. The process of preparing of supercapacitor cell electrodes begins with pre-carbonization using an electric oven, chemical activation using 0.5M KOH activator, carbonization process using N2 gas at a temperature of 600°C and physical activation using CO2 gas. Analysis of the  supercapacitor cell electrodes made from young coconut coir showed that the sample with a physical activation temperature of 750°C was the best sample, indicatedby a low density value of 0.68 g/cm3andthe highest specific capacitance of 225.1736 F/g which was tested using Cyclic Voltammetry method.
AKTIVASI ZEOLIT ALAM SEBAGAI ADSORBEN PEWARNA ALAMI KULIT BUAH NAGA (PITAYA) Eka Nurul Hidayah; Munasir Munasir
Komunikasi Fisika Indonesia Vol 19, No 2 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.2.99-107

Abstract

Natural zeolite is one of the alternative adsorbents with good absorption capabilities, including in absorbing color. The adsorption ability of zeolite can be increased by the activation process because it can increase the Si/Al ratio and pore size. Dragon fruit peel is a natural material that can be used as a natural dye because it contains betacyanin pigments which are equivalent to synthetic dyes. This study aimed to investigate the characteristics of activated green and brown zeolite and their adsorption ability on natural dyes of dragon fruit peel. Zeolite was activated chemically using 3M HCl solution and physically through a heating process of 500°C, then characterized using XRD and FTIR. The zeolite adsorption process was carried out with variations in contact time of 30, 60 and 90 minutes and variations in the mass of the adsorbent 0.1, 0.3 and 0.5 grams. The results of XRD analysis showed that the green and brown zeolite contained mordenite, nepheline and quartz minerals. The highest percentage of color degradation in the adsorption process was in brown zeolite at 27.70% at a contact time of 90 minutes and 88.2% at an adsorbent mass of 0.5 grams. Differences in brown zeolite before and after adsorption can be seen from the shift in the wavelength of each functional group due to the interaction with dragon fruit peel.

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