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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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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 TINGKAT KEMATANGAN BUAH SAWIT DENGAN INJEKSI TEGANGAN SEARAH Dino Yanuardi; Saktioto Saktioto; Romi Fadli Syahputra; Defrianto Defrianto; Yan Soerbakti
Komunikasi Fisika Indonesia Vol 20, No 2 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.2.109-114

Abstract

Palm fruit is Indonesia's main communiqué as the largest foreign exchange contributor processed into crude palm oil (CPO). However, the quality of CPO that will be produced is influenced by the right level of maturity of palm fruit so as not to cause losses from the processor. Losses from the palm fruit processing can be overcome using a method that can determine the maturity level of the palm fruit, one of which is by injecting the voltage in the direction of the palm fruit. The purpose of direct voltage objection to the function of time in the palm fruit is to obtain a voltage response relationship to the content of yield, moisture content and free fatty acid (ALB) in the palm fruit. In this study, palm fruit was classified into 4 levels of maturity, namely unripe, almost ripe, ripe and overripe given direct voltage injection of 9 Volts for 1 minute with 3 repetitions using four electrodes arranged parallel to obtain an electrical voltage response with an electrode diameter of 1.4 mm. The distance between electrodes was chosen to be 4 – 6 mm from stainless steel materials, and the depth of the electrode to the palm fruit is 3 – 5 mm. Palm fruit was injected with electrical voltage and obtained the value of voltage response, electric current, resistivity and power of each level of maturity. The electrical information obtained will explain the yield content, water content and ALB in palm fruit in accordance with the classification of ripeness. The results of the study obtained, that the palm fruit is said to ripen when it has a voltage response value of 0.586 – 0.765 V, electric current 385 – 404.9 μA, resistivity 40.197 – 54.523 Ωm, and power 0.238 – 0.299 mW. The results showed that the maturity level of palm fruit based on its chemical content affects the properties of electricity.
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.
STUDI PENERAPAN AKUSTIK PADA GERBONG KERETA API SRI LELAWANGSA Riri Angriani Nasution; Zubair Aman Daulay; Abdul Halim Daulay
Komunikasi Fisika Indonesia Vol 20, No 2 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.2.171-178

Abstract

This study aims to determine the noise level in the Sri Lelawangsa train carriage without the addition of sound-absorbing materials and to determine the thickness of the sound-absorbing material needed to meet the acoustic comfort standard if it is simulated in a sample testing room. Noise level measurements were carried out on the Sri Lelawangsa train carriages in conditions without the addition of sound-absorbing materials. This noise level measurement was carried out in three carriages of the Sri Lelawangsa train, namely the train carriage, engine carriage, and passenger carriage, the source of noise comes from outside and inside the Sri Lelawangsa train. The study of the application of acoustics was carried out in a sample testing room made of cardboard boxes with a length of 34cm, width 25, cm and height 32 cm, and the source of noise in the sample testing room was the speaker. The absorbent material used to meet the acoustic comfort standard is pyramidal foam which is placed on the nearest side of the sound source. The measuring instrument used to measure noise on the Sri Lelawangsa train is a sound level meter and the Surfer Golden V16 software is used to describe the distribution of sound in the Sri Lelawangsa train carriage. The noise level on the Sri Lelawangsa train still exceeds the quality standard set by the Regulation of the Minister of Transportation of the Republic of Indonesia No. 75 of 2015 which is 80 dB. The highest noise level in the passenger car is at point (1) 82.81 dB. The machinist carriage is 84.70 dB, and the engine carriage is at point (2) 88.92 dB. After measuring the reverberation time on the Sri Lelawangsa train carriage, it is known that the surface area of the sound absorbing material needed to meet the reverberation time standard on the Sri Lelawangsa train carriage is 34,83 m3 with an absorption coefficient (α) of 0.58 according to with the provisions of SNI 03-6306-2000.
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.
SINTESIS FISIKOKIMIA DARI KARBON AKTIF BERBASIS BIOMASSA SABUT NIPAH (Nypa fruticans) UNTUK PERFORMANSI KINERJA SUPERKAPASITOR Irma Apriyani; Rakhmawati Farma; Awitdrus Awitdrus; Aria Yunita
Komunikasi Fisika Indonesia Vol 20, No 2 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.2.127-134

Abstract

Biomass-based activated carbon materials provide a new approach for the development of high-performance electrode materials for supercapacitor cells. In addition, the carbon materials are low cost and sustainable for large-scale production of electrode materials. In this study, carbon electrodes made from nipa palm (Nypa fruticans) coir were synthesized physicochemically. The pore size distribution of the carbon electrodes can be adjusted with the increased CO2 activation temperature (700°C, 800°C, and 900°C). The results showed that the SN-800 carbon electrode had the lowest density shrinkage and showed excellent electrochemical performance. The highest specific capacitance was obtained at 247 F/g at a current density of 1 A/g in a symmetrical two-electrode system. This work provides an efficient strategy for the preparation of high performance carbon electrodes based on nipa coir biomass.
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%.
ANALISIS KECEPATAN DAN GAYA HAMBAT MOBIL PADA TANJAKAN DENGAN SUDUT ELEVASI YANG BERBEDA Lutfi Puspita Meliasari; Fatimah Putri Utami; Bayu Setiaji
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.20.1.91-96

Abstract

In this day and age almost everyone has private vehicles, especially cars. When driving using a car, you must always pay attention to the terrain traveled, such as uphill roads. When uphill, the car must resist obstacles, such as rolling inhibition force, incline drag force, and wind inhibition force. This study aims to determine the inhibitory force on the incline so that it must estimate the amount of gas speed of the car when passing the ramp, and can reduce the risk of accidents. In this study using quantitative methods with the help of tracker applications. This study resulted in an incline inhibition force when the car went uphill, namely in black cars of 2,112 N at a speed of 4,539 m/s, in black pick up cars of 1,350 N at a speed of 4,970 m/s, in white pick up cars of 1,166 N at a speed of 2,870 m/s, and on white cars of 1,840 N at a speed of 3,850 m/s.

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