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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 15 Documents
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Search results for , issue "Vol 21, No 3 (2024)" : 15 Documents clear
The effect of water content on increasing grammage in paper made from water hyacinth and cassava peel Sariah, Jati Nur; Jumiati, Ety; Lubis, Ridwan Yusuf
Indonesian Physics Communication Vol 21, No 3 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.3.271-274

Abstract

Paper is a thin sheet-shaped material containing cellulose from wood. The high demand for paper makes the raw material for paper production increase, which causes forest exploitation. As for this study to determine the effect of mixed variationsin the mixture made from ater hyacinth and cassava peel with the adition of NaOH solution, the characteristics of the paper produced, and the optimal paper quality. Variations in the percentage of water hyacinth and cassava skin raw materials, namely: sample A 30% : 70%, sample B 50% : 50%, and sampel C 70% : 30%. Using the experimental method is done with the soda process. The characterization tests carried out were grammage and water content. The results of the characteristictest obtained grammage values in sample A = 51.6 g/m2, sample B = 84.0 g/m2, sample C = 97.0 g/m2. Test the water content in sample A = 5.7%, sample B = 5.9%, and sample C = 6.1%. Has met the value of SNI 7274-2008 for printing type A paper.
N-doped porous activated carbon from rubber seed shells (Hevea brasiliensis) as high-energy supercapacitor material Daulay, Siti Rahma; Farma, Rakhmawati; Awitdrus, Awitdrus
Indonesian Physics Communication Vol 21, No 3 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.3.211-218

Abstract

Biomass is an environmentally safe and cost-effective source of activated carbon (AC) for supercapacitors (SC). In this study, AC was generated using precarbonisation and activation with KOH using rubber seed shell (RSS) as a precursor. The electrochemical performance was investigated by cyclic voltammetry and galvanostatic charge-discharge determination and the ACs were characterised using FTIR analysis technique. RSS materials were prepared by varying calcination temperatures of 700°C, 800°C, and 900°C without doping. RSS800 shows a maximum specific capacitance of 190 F/g and has an energy density of 26.2 Wh/kg and a power density of 695.4 kW/kg at 1 A/g. Furthermore, melamine was used as an external dopant source for the N-doping process. The doped AC sample (RSS800-90) had a specific capacitance of 288 F/g and has an energy density of 40.9 Wh/kg and a power density of 515.4 kW/kg at 1 A/g in H2SO4 electrolyte. N-doped with melamine as nitrogen source was successfully incorporated into AC to produce high-performance electrodes for SC.
Analysis of the effect of calcination and substitution on the phase properties of strontium-hydroxyapatite Putri, Elvina; Iwantono, Iwantono; Zulkarnain, Zulkarnain; Setiawan, Jan
Indonesian Physics Communication Vol 21, No 3 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.3.245-256

Abstract

Hydroxyapatite (HAp) is a ceramic biomaterial that is highly biocompatible and employed in a variety of biomedical applications. Its chemical formula is Ca10(PO4)6(OH)2, comprising calcium and phosphate, the primary minerals found in bones and teeth. The precipitation method can be used to change the structure of hydroxyapatite by replacing strontium ions (Sr2+) with calcium ions (Ca2+). This work aims to determine the physical parameters of Sr-HAp samples with substitutions of 0, 0.25, 0.3, 0.5, and 0.75 %-mol. The samples were dried at 105ºC for four hours and then calcined at 750ºC for two hours. Sr-HAp samples were examined using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and SEM-EDX. The XRD data revealed diffraction patterns with distinctive peak intensities, lattice characteristics, and crystal structures. The XRD data revealed diffraction patterns with distinct peak intensities, lattice characteristics, and crystal structures modified by Sr replacement. The FTIR data revealed vibrations of the PO3-, Ca–O, Sr–O, and OH- functional groups, with differences in intensity and peak shifts caused by Sr substitution. SEM results revealed the shape of Sr-HAp particles in an agglomerated form, while EDX supplied elemental composition data through a comparison of O, P, Ca, and Sr atomic percentages. The study found that Sr substitution and calcination alter the structure, morphology, and bioactivity of Sr-HAp. Sr substitutions at 0% and 0.5% are remarkable in that they result in multiphases after calcination.
Physical characteristics of water paint with the addition of bintaro extract additives Syahputra, Romi Fadli; Wulandari, Surya; Ginting, Delovita
Indonesian Physics Communication Vol 21, No 3 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.3.275-280

Abstract

The addition of additives to paint aims to improve the quality and usability of paint. Natural additives, such as bintaro seed extract, have potential as anti-bacterial and anti-fungal agents. This study aims to investigate the physical properties of commercial paints added with bintaro seed extract. The physical properties tested were changes in density and adhesion. While the chemical content was characterized using HPLC and FTIR. The extraction process includes drying to grinding the bintaro seeds into powder, followed by extraction using a ratio of bintaro powder and 96% (m/v) ethanol 1:3. Bitaro extract obtained was added to commercial watercolors (100 ml) with variations of 5, 10 and 15 ml. The paint is applied to the surface of the multiplex wood evenly by pre-heating it at 40°C. The adhesion analysis was carried out using the help of ImageJ software to determine the ratio of the gray value of the image before and after the adhesion test using the cross-cut technique. It was observed that the increase in bintaro seed extract caused a decrease in paint adhesion.
Prediction of Pekanbaru City rainfall using dynamic models Yunita, Esy; Retnawaty, Sri Fitria; Fitrya, Neneng
Indonesian Physics Communication Vol 21, No 3 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.3.219-226

Abstract

The need for predictions is very necessary in various sectors of life, one of which is rainfall predictions. The threshold value for PM10 particles that is allowed to be in ambient air is, 150 µgram/m3/day). The aim of this research is to create a dynamic model predicting Pekanbaru City's rainfall for the next 3 years. Rainfall prediction in this research was carried out using the dynamic system modeling method with Powersim software. The data used is BMKG data for the Pekanbaru City for 5 years (2015 – 2019) using 4 parameters, namely rainfall, air humidity, wind speed and temperature. Prediction results show that air humidity in Pekanbaru City has the same pattern as BMKG, namely the highest month is December and the lowest is August. Wind speed prediction results are highest in July and lowest in May. The highest temperature in Pekanbaru City is in April and the lowest is in January. Rainfall for 2020 – 2021 is predicted to experience light rain on average, because it has the same data pattern on the variables that influence it. So it can be interpreted that the validation results for air humidity, wind speed and temperature in Pekanbaru City show that they are valid because they do not exceed the limit value of ≤ 5%.

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