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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 18, No 1 (2021)" : 15 Documents clear
SEBARAN AIR TANAH MENGGUNAKAN METODE GEOLISTRIK RESISTIVITAS KONFIGURASI DIPOLE-DIPOLE Resma Silvia; Usman Malik
Komunikasi Fisika Indonesia Vol 18, No 1 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.1.18-21

Abstract

This research has been worked in the Graha Mustamindo Permai 3 Housing area, Rimba Panjang Village, Tambang District. This research been thorough to calculate the value of measured rock resistivity in Graha Mustamindo Permai 3 Housing and analyze rock layer types through rock resistivity values at Sepakat street, Rimba Panjang, Riau. The method using in this research is geoelectric resistivity of the Dipole-dipole configuration, two lanes with the same length of 100 meters are used and spacing between electrodes is 7 meters. The data obtained were processed using Res2Dinv software version 3.54.44. The data result that obtained show two differences trajectories in Rimba Panjang Village has varying resistivity, namely in the first lane around 1.595 Ωm to 2,762 Ωm and in the second lane 1.594 Ωm to 5,879 Ωm. Groundwater potential in the first and second lanes is quite large and is thought to be in a free aquifer so that it is easy to drill.
PENENTUAN NILAI SUSEPTIBILITAS DAN UKURAN PARTIKEL MAGNETIK PASIR ALAM LOGAS KABUPATEN KUANTAN SINGINGI MENGGUNAKAN VARIASI UKURAN BALL MILLING Azura Royka; Erwin Amiruddin
Komunikasi Fisika Indonesia Vol 18, No 1 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.1.42-47

Abstract

Magnetic properties and morphology of natural sand has been carried out in Logas Village, Kuantan Singingi Regency have been determined. Iron sand samples were processed using iron sand separator (ISS) prior to ball milling for separating between magnetic and non magnetic particles. The product of ISS was milled for 90 hours using ball milling first step method with milling ball size of 1.5 cm. Themagnetic and non-magnetic particles of ball milling products were separated  using Neodymium Iron Boron (NdFeB) magnet. The product of ball milling first step then was milled for another 30 hours with milling ball size of 0.5 cm and 0.7 cm. The susceptibility and mass susceptibility were determined based on magnetic induction of a selenoid measured using Probe Magnetic Pasco PS-2162. The composition of Logas natural sand was measured using x-ray fluorescence spectroscopy (XRF). The morphology of the magnetic particles are determined using scanning electron microscope (SEM). The results showed that the particle size of natural sand for 90 hours + 30 hours milling displays the particle sizes from 100 µm to 800 µm. As for the particle size of the samples synthesized with 90 hours + 30 hours for 0.7 cm milling ball size, the particles are almost evenly distributed, which is about 5 µm to 100 µm. The content of Fe and Ti in the sample has increased while for Si has decreased. Mass susceptibility increases with increasing ball milling time and ball milling size.
PENGARUH PENAMBAHAN PERAK PADA MOLEKUL DYE TERHADAP EFISIENSI DYE SENSITIZED SOLAR CELL Rati Okta Della; Iwantono Iwantono
Komunikasi Fisika Indonesia Vol 18, No 1 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.1.64-68

Abstract

Dye sensitized solar cell (DSSC) is made with a layer arrangement of fluorine tin oxide (FTO), zinc oxide (ZnO), dye, electrolyte, and plastisol. ZnO nanorods which play a role as photoanode in DSSC have been successfully grown on FTO substrate using seed mediated hydrothermal method at temperature of 90 ºC for 8 hours. Modification was made to increases the efficiency of DSSC by adding silver (Ag) with concentration of 5 mM into dye molecules. ZnO characterization was performed using ultra violet-vissible (UV-Vis) spectroscopy and field emission scanning electron microscopy (FESEM). The strongest UV-Vis absorbance spectrum with the optimum absorbance for the ZnO sampel was occurred at the wavelength range of 300 – 360 nm. Meanwhile, for the ZnO sample with addition of 5 mM Ag into dye molecule was occurred at the wavelength range of 440 – 530 nm. FESEM image of the sample shows the as-synthesized ZnO nanorods have hexagonal cross section. I-V characteristics in the light mode was carried out to determine the efficiency of DSSC using  a halogen lamp with an intensity of 100 mW/cm2. The efficiency of DSSC using ZnO with addition of 5 mM Ag into dye molecule is 0.462%, increases compared to the efficiency of DSSC using ZnO without addition of Ag into dye molecule which only produce 0.45% efficiency. These results indicate that the addition of Ag can increase the efficiency of DSSC.
KARAKTERISASI SIFAT ELEKTROKIMIA ELEKTRODA KARBON BERBAHAN PELEPAH AREN MENGGUNAKAN LARUTAN ELEKTROLIT Na2SO4 Decha Apriliany Suwandi; Awitdrus Awitdrus
Komunikasi Fisika Indonesia Vol 18, No 1 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.1.88-92

Abstract

The electrical energy crisis occurs due to the availability of non-renewable sources of electrical energy. The focus of research is currently developing on how to store electrical energy using biomass energy. This study aims to analyze the electrochemical properties of the palm frond based carbon electrode using electrolyte solution of Na2SO4. Pre-carbonization of palm fronds was carried out using an electric oven with a temperature of 100 °C – 250 °C for 2 hours. Chemical activation using KOH activating agent with a concentration of 0.3 M at 80 °C for 2 hours. Carbonization was carried out at a temperature of 600 °C using an N2 gas environment and followed by a chemical activation process using CO2 gas at a temperature of 850 °C for 2.5 hours. Na2SO4 with a concentration of 0.5 M is used as a solution in the manufacture of supercapacitor cells. The scanning rate is inversely proportional to the specific capacitance value generated. Characterization of electrochemical properties was carried out using the cyclic voltammetry method resulting in a specific capacitance value of 61.71 F/g for a scan rate of 1 mV/s, 57.93 F/g for scan rate of 2 mV/s and 51.37 F/g for scan  rate of 5 mV/s.
PEMBUATAN ELEKTRODA KARBON AKTIF DARI TANDAN KOSONG BUAH AREN DENGAN VARIASI SUHU KARBONISASI Irma Apriyani; Rakhmawati Farma
Komunikasi Fisika Indonesia Vol 18, No 1 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.1.58-63

Abstract

The preparation and characterization of the physical properties of activated carbon electrodes derived from the biomass of empty palm fruit bunches were analyzed by varying the carbonization temperature. Biomass of empty palm fruit bunches is selected as a base material for making carbon electrodes throught a pre-carbonization process, chemical activation with KOH 0.5 M activator, carbonization process with variations in temperature 650 °C, 700 °C, 750 °C, and 800 °C under an N2 gas environment, and activated by CO2 gas at 900 °C. Reduce of carbon mass by 20.182 % and produce carbon powder. Thermogravimetry show that thermal resistance temperature of 307 °C a carbon powder. The density value of each carbon electrode for carbonization temperature of 650 °C, 700 °C, 750 °C and 800 °C is 0.557 g/cm3, 0.622 g/cm3, and 0.702 g/cm3, respectively. Microstructure analysis shows that amorphous structure for the activated carbon electrodesshowed by the presence of the peaks of 2θ around 24° and 44°.The results showed that the temperature of 700 °C is the best carbonization temperature in production of carbon electrodes from TKBA.

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