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Usman Malik
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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 15 Documents
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Search results for , issue "Vol 20, No 1 (2023)" : 15 Documents clear
ANALISIS SIFAT MEKANIK PLASTIK BIODEGRADABLE PATI BIJI ALPUKAT DAN SELULOSA SEKAM PADI Ety Jumiati; Miftahul Husnah; Sunny Nafisah
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.69-74

Abstract

Biodegradable plastics have been investigated using avocado seed starch, rice husk cellulose, chitosan, and glycerol in order to determine the mechanical characteristics of biodegradable plastics. Variations in the composition of avocado seed starch and rice husk cellulose in each sample A (100% : 0%), B (87.5% : 12.5%), C (75% : 25%), D (62.5% : 37.5%), and E (50% : 50%). The process of making biodegradable plastic is carried out using a material mixing process using a magnetic stirrer and a hot plate at a maintained temperature of  ± 70°C − 80°C and dried in an oven. Mechanical tests carried out include tensile strength, elongation, and modulus of elasticity tests. The results of the mechanical characterization test for the optimal biodegradable plastic are found in sample E (50% : 50%) with a tensile strength value of 20.6123 MPa and an elastic modulus of  353.7985 MPa which meets the ASTM D882-12 standard.
PEMANFAATAN LIMBAH KULIT SINGKONG DAN SEKAM PADI DALAM PEMBUATAN BIOBRIKET DENGAN PEREKAT TAPIOKA SEBAGAI BAHAN ALTERNATIF BIOMASSA Ratu Intan Berlian; Lalu Ahmad Didik Meiliyadi; Bahtiar Bahtiar
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.1-8

Abstract

This study aims to determine the effect of sample comparison composition on moisture content, ash content, calorific value, mass density, combustion time and rate of combustion of biobriquettes. In this briquette, the samples tested are materials from processed waste products of cassava peel and rice husks with tapioca adhesive. This study uses six stages, namely the preparation stage, drying stage, mixing stage, combustion stage, and quality test stage. In testing the quality of briquettes, three samples were used in each briquetting test, namely samples A, B, and C, each of which was a ratio of cassava peel and rice husk of 10:90, 20:80, and 30:70. The results showed that the lowest water content was found in the ratio between cassava peel and rice husk 10:90, the lowest ash content was found in biobriquettes with a ratio of cassava peel and rice husk 10:90, the highest heating value was found in a ratio of 10:90, mass density the highest is in the ratio of 10:90, the fastest burning rate is in the ratio of 10:90, the longest burning time is in the ratio of cassava peel and rice husks of 10:90. So that the comparison composition of quality cassava peels and rice husks is if the addition of the composition of the rice husk samples is more in number than the composition of the cassava peels.
PEMBUATAN INKUBATOR TELUR DENGAN ARDUINO SEBAGAI MIKROKONTROLER MENGGUNAKAN SISTEM INTERNET OF THINGS (IoT) Andara Paulina; Masthura Masthura; Nazaruddin Nasution
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.103-108

Abstract

In the process of hatching eggs in poultry, stable temperature and humidity are needed so that the eggs can develop properly. Poultry eggs, especially chickens take 21 days to hatch with a temperature of 37°C – 39°C and humidity of 50% – 60%. The study aims to produce an incubator that is able to monitor temperature and humidty based on arduino microcontrollerswith an internet of things (IoT) system and determine the stability of temperature and humidity values in the incubator. Test were carried out by incubating 6 eggs in an incubator with the result that 5 eggs hatched perfectly and 1 other egg did not develop properly. The conditions of temperature and humidity during the hatching process are classifed as stable, namely termperatures between 37.34°C – 38.34°C and humidity between 52.80% – 56.40%. The system is able to read and send the readings of temperature and humidity sensor values to the Blynk aplication properly.
STUDI KOMPUTASI KARAKTERISTIK OPTIK CYANIDIN SEBAGAI SENSITISER DENGAN PELARUT ETHANOL, AIR, DAN ACETONITRILE Elvan Yuniarti; Ai Nurlaela
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.39-48

Abstract

Cyanidin molecule is a type of anthocyanin that has the potential as a sensitizer for dye sensitiser solar cell (DSSC). This molecule is contained in blueberries, grapes, raspberries, and others. This study aims to determine cyanidin molecules' molecular orbitals and HOMO-LUMO energy levels with ethanol, water, and acetonitrile. In addition, this study aims to determine the optical properties of cyanidin dye with ethanol, water, and acetonitrile as solvents. The method used in this research is density functional theory (DFT) and TD-DFT/UB3LYP using Orca.2.02 and quantum espresso applications. The results obtained in the molecular orbitals of cyanidin with various solvents (ethanol, water, acetonitrile) obtained energy gap: 2.8 eV, 2.4 eV, and 3.2 eV. The results of UV-Vis absorption spectra (ethanol, water, acetonitrile) have the same wavelength (158.80 nm – 271.10 nm, 362.10 nm, 453.60 nm) but the intensity is different. Likewise the results of theinfra red spectra (1138 cm-1 – 1486 cm-1), and the Raman spectra (1141 cm-1 – 1606 cm-1) for different solvents have almost the same wave number.
ANALISA PERUBAHAN SUSEPTIBILITAS DAN KOMPOSISI SERTA UKURAN PARTIKEL OKSIDA BESI SEBAGAI FUNGSI KECEPATAN PUTARAN TABUNG BALL MILLING Indah Nurhidayah; Salomo Sinuraya; Erwin Amiruddin; Rahmondia Nanda Setiadi
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.75-82

Abstract

The magnetic susceptibility, composition and particle size of natural sand has been carried out in Rokan River, Riau Province regency have been determined. Iron sand samples were processed using an iron sand separator (ISS). The magnetic and non-magnetic particles of ISS products were separated using neodymium iron boron (NdFeB) magnet. The product of ball milling (BM) with tube rotational speed functions of 100 rpm, 150 rpm, 200 rpm was milled for 80 hours with BM size of 2 cm. The magnetic susceptibility were determined based on magnetic induction of a selenoid measured using Probe Magnetic Pasco PS-2162. The composition of Rokan river natural sand was measured using x-ray fluorescence. The magnetic particles are determined using scanning electron microscope. The results showed that the magnetic susceptibility increases with increasing BM tube rotational speed 28,138.79 × 10-5 (100 rpm), 29,374.88 × 10-5 (150 rpm), and 30,955.32 × 10-5 (200 rpm). The composition of Fe in the sample has increased from 32.686% to 35,865%, while for Si has decreased from 38.604% to 33.729%. The particle size of natural sand for 80 hours milling displays the particle sizes from  883.4 for 100 rpm to 655.81 for the smallest particle size of the samples synthesized with 200 rpm.
SINTESIS KARBON BERPORI BERBASIS DAUN JERUK NIPIS (Citrus Aurentifolia S.) SEBAGAI MATERIAL ELEKTRODA UNTUK APLIKASI SUPERKAPASITOR Erman Taer; Melda Riyani Butet; Apriwandi Apriwandi; Rika Taslim
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.9-18

Abstract

In this study, the electrode material was successfully made from activated carbon based on lime leaf biomass with variations in physical activation temperature of 800 ˚C, 850 ˚C, and 900 ˚C for supercapacitor applications. Porous carbon was synthesized through pre-carbonization steps, chemical activation using ZnCl2 activator, carbonization using N2 gas at a temperature of 600 ˚C, and physical activation using CO2. Density analysis confirmed the potential for the DJN-850 sample to have a high shrinkage of 52.24%. X-ray diffraction shows an amorphous structure of carbon characterized by broading peaks at 2θ=22° and 24°. Scanning electron microscopy analysis performed that the optimized sample possessed rich meso-,macropores followed by a high carbon content of 90.25%. The Fourier spectroscopic transformation test results identified the presence of functional groups O-H, C-O, C-H, C=C, and C≡C in the sample. The precursor activated at 850 C possessed a specific surface area of 675.129 m2 g-1 with adjusting micro-mesopore. Furthermore, the electrochemical properties of the samples were measured using cyclic voltammetry and galvanostatic charge-discharge with specific capacitances of 144.14 F g-1 and 189 F g-1, respectively.. Keywords: biomass precursor; Citrus aurentifolia S., carbon porous, electrode material, supercapacitor
ANALISIS STRUKTUR KARAKTERISASI XRD DAN SEM PADA REDUCED GRAPHENE OXIDE (rGO) LIMBAH BAN Sandi Tri Febriani; Ety Jumiati; Miftahul Husnah
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.49-54

Abstract

Research has been carried out using waste tires as the basic material for reduced graphene oxide (rGO). This research has been successfully synthesized using waste tire smoke with combustion and microwave assisted methods as a faster, easier, and safer synthesis process. The characterizations used in this research are X-ray diffraction (XRD) and scanning electron microscope (SEM). The powder is obtained through the process of capturing smoke from burning waste tires manually at a temperaturre of 300°C for 3 hours. Then it was reduced using microwave heating with variations in heating time of 20, 25, and 30 minutes. The results of the XRD characterization data showed a diffraction peak (002) peak at 2θ = 25° and a diffraction peak (101) peak 2θ = 43.9° which identified rGO and the results of the SEM characterization test obtained that the surface morfology formed a thin sheet.
ANALlSA KECEPATAN PUTARAN TABUNG BALL MlLLlNG TERHADAP SUSEPTlBILlTAS MAGNETlK DAN KOMPOSlSl SERTA UKURAN PARTlKEL OKSlDA BESl PASlR ALAM SUNGAl ROKAN Tasyha Dwi Safira; Salomo Sinuraya; Erwin Amiruddin; Rahmondia Nanda Setiadi
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.83-90

Abstract

Magnetic susceptibility and composition of magnetic particles from the natural sand iron oxide, at Rokan River in Riau Province as a function of the rotating speed of ball milling tubes. Samples are separated the magnetic particles from non-magnetic particles using iron sand separator (ISS), called the ISS product. Refinement using neodymium iron boron magnet (NdFeB). The ball milling process is carried out for 80 hours using combined iron balls with diameter of 0.7 cm (48 balls), 1.5 cm (24 balls), and 2 cm (16 balls) with variety milling tube rotational speeds of 100, 150, and 200 rpm. The calculation of the magnetic susceptibility value is carried out based on the values of B0 and BT, while the composition of the sample by X-ray fluorescence (XRF) and the magnetic particle size of the sample is classified by scanning electron microscope. The result of the study indicates that the magnetic susceptibility of the ISS product has a value 2,895.99 × 10-5, while the value of the magnetic susceptibility of ball milling product increases with the increase in the rotating speed of the tube, namely 27,997.52 × 10-5, 29,975.27 × 10-5, and 30,690.44 × 10-5. XRF results show that the magnetic element Fe increased from 32.069% to 39.645%, while the non-magnetic element Si decreased from 31.127% to 29.187%. The average particle size obtained was smaller as the rotational speed of the milling tube increased, namely 679.72 nm, 619.14 nm, and 568.94 nm.
PEMODELAN KECEPATAN ALIRAN DARAH PADA DOMAIN MENYERUPAI PEMBULUH DARAH DENGAN FEATOOL MULTIPHYSICS Andika Thoibah; Defrianto Defrianto; Saktioto Saktioto
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.19-24

Abstract

Currently, computer-based simulation methods are widely used in blood flow analysis. The application of this method has been widely used in modeling blood vessels. This article presents an example of a simple blood vessel modeling to determine the velocity of blood flow to the viscosity of blood in the blood vessels. The mathematical model of human blood flow through vascular ramifications was studied using finite element analysis (FEA), which is applied to the stable two-dimensional flow of viscous fluids through various shapes. Flow through a two-dimensional model of aortic vessels, capillaries, and veins is simulated. The velocity distribution through the blood vessels is calculated. The validity of the calculation method is determined by comparing the numerical results with other results. The implementation of the Navier-Stokes equation in a vascular model using the finite element method shows that the velocity of blood flow depends on the viscosity. The higher the viscosity of the blood, the slower the rate of blood flow in the veins.
IDENTIFIKASI INTRUSI AIR LAUT PADA AKUIFER MENGGUNKAN METODE GEOLISTRIK Iyu Suknawati; Usman Malik
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.55-60

Abstract

The identification of the effect of seawater intrusion on aquifers on groundwater depth using the geoelectrical dipole-dipole configuration method has been carried out in Tanjung Kapal Village, Rupat Bengkalis. In this study, the length of the track used is 100 meters. data retrieval used are resistivity meter, resulting current data (I) and potential difference (V). Data processing uses Res2divn software which results in the form of image resistivity, 2D resistivity below the surface. This track has a distance of 200 m from the coast with resistivity values ranging from 0.726 –351 Ωm. Interpretation results show that there is sea water intrusion on this line as evidenced by its resistivity value. The resistivity value of rocks affected by intrusion on track is 0.726 – 4.26 Ωm. The results of the quality of groundwater that have been tested are classified as brackish. Well water is not suitable for human consumption. correspondingto the test results of well water samples showed a pH value of 7.0 and a salinity of 0.22%.

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