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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 390 Documents
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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%.
Relation of reflectance intensity and chemical contents of oil palm fresh fruit bunches using multispectral imaging Arpyanti, Nisa; Shiddiq, Minarni; Setiadi, Rahmondia Nanda; Rabin, Mohammad Fisal; Harmailil, Ihsan Okta; Dasta, Vicky Vernando
Indonesian Physics Communication Vol 22, No 2 (2025)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.22.2.149-156

Abstract

Multispectral imaging has been widely used for the classification of fruits and vegetables. This technique offers both spectral and spatial resolution, enabling the evaluation of fruit quality based on its chemical properties. This study aims to analyze the relationship between reflectance intensity obtained from multispectral imaging and the chemical composition of oil palm fresh fruit bunches (FFBs), specifically oil content and free fatty acid (FFA) levels, measured using the Soxhlet extraction method. The multispectral imaging system consists of a monochrome camera and an LED light source with eight wavelengths ranging from 680 nm to 900 nm. FFB images were processed using Python scripts to extract reflectance intensity. The Python scripts were also used to analyze the correlation between reflectance intensity and both oil content and FFA levels. A total of 15 unripe and 15 ripe FFB samples were used. Correlation analysis was focused on the 780 nm wavelength due to its high reflectance intensity. The results showed that the correlation coefficient between reflectance intensity and oil content was r = -0.39 for unripe fruits and r = 0.29 for ripe fruits, while the combined data yielded a strong correlation of r = 0.92. For FFA, the correlation was r = -0.41 for unripe fruits, r = -0.34 for ripe fruits, and r = 0.72 for the combined dataset. These findings demonstrate that multispectral imaging is a promising non-destructive method for classifying the ripeness of oil palm FFBs based on oil content and FFA levels.
Literature study on the evaluation of lead apron thickness in radiology service units Edward, Sharon Gracia
Indonesian Physics Communication Vol 22, No 2 (2025)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.22.2.61-66

Abstract

Radiation protection is an effort that can be undertaken to reduce the dangers of radiation. The ALARA principle of radiation protection is needed to minimize the radiation exposure received by workers based on three components: exposure time, distance, and the use of protective equipment. Therefore, an analysis of the effectiveness of lead aprons in protecting workers from radiation exposure is conducted. The method employed involves conducting a literature review on three journals discussing the effectiveness of lead aprons in protecting workers from radiation exposure based on varying apron thicknesses and exposure factors. At 100 kVp tube voltage, a lead apron with 0.25 mmPb thickness and exposure time of 100 mAs has an effectiveness of 25% (15 years old) and 98.1% (3 years old), while a thickness of 0.35 mmPb with an exposure time of 5 mAs has an effectiveness of 93%. At 70 kVp tube voltage, a lead apron of 0.35 mmPb thickness with an exposure time of 5 mAs has an effectiveness of 98.4%. A 0.5 mmPb lead apron with exposure times ranging from 20 mAs to 72 mAs has an effectiveness between 93.75% and 99.219%. The effectiveness of a lead apron is influenced by tube voltage, exposure time, age, and quality of the lead apron. A thick apron does not necessarily have high effectiveness in protecting workers if it has poor quality, and vice versa.
Preliminary study on the utilization of cabbage waste as a raw material for activated carbon in supercapacitor applications Syahputri, Intan; Awitdrus, Awitdrus
Indonesian Physics Communication Vol 22, No 2 (2025)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.22.2.97-104

Abstract

This study aims to utilize cabbage waste as an active carbon material for supercapacitor electrodes through an environmentally friendly approach without chemical activation. The fabrication process includes pre-carbonization at 200°C for 1 hour, carbonization at 600°C, and physical activation at 850°C. The resulting carbon material exhibits a porous structure essential for ion storage, despite the absence of chemical activation. Electrochemical testing using the galvanostatic charge-discharge method with Na2SO4 electrolyte concentrations of 0.5 M, 1 M, and 1.5 M demonstrated a highest specific capacitance of 155.87 F/g at 1.5 M concentration. The increase in electrolyte concentration enhances ion mobility and charge storage capacity. This research indicates that cabbage waste can serve as an effective active carbon source for supercapacitors, with further performance improvements expected through chemical activation in future studies.
Bioelectricity and biomagnetism as keys to realization of neurotechnology Erwin, Erwin; Taer, Erman; Afrinal, Afrinal
Indonesian Physics Communication Vol 22, No 2 (2025)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.22.2.157-168

Abstract

The importance of bioelectricity and biomagnetism in neurotechnology has been outlined in this study. There are three main processes in neurotechnology, namely: signal delivery, data storage and data processing. These neurotechnological processes require three essential things, namely measurements, tools and materials. This scientific study describes the form of signal delivery in neurotechnology, the form of data storage and the form of data processing. The measurement methods that can be applied have also been described along with the tools and materials. Bioelectricity plays a very important role in building neurotechnology. Meanwhile, biomagnetism is an important aspect that cannot be separated from the phenomenon of bioelectricity which also supports systems in neurotechnology. The phenomena of bioelectricity and biomagnetism in neurotechnology are described in this study along with measurement devices and materials. Measuring devices and materials must be modified as conditions permit in their working conditions. It has also been studied that natural neurotechnological data storage in living creatures is through muscle memory, signal delivery occurs in the form of bioelectricity and data processing is a combination of data delivery and storage. This study also examines the future prospects of neurotechnology along with its moral aspects.
A medical physics review of the use of contrasodium in hysterosalpingography (HSG) examinations Akbar, Aidil; Habib, Alltop Amri Ya; Simanjuntak, Asnika Putri; Emrinaldi, Tengku
Indonesian Physics Communication Vol 22, No 2 (2025)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.22.2.85-96

Abstract

Hysterosalpingography (HSG) is a widely used radiological procedure for evaluating female infertility, particularly in assessing fallopian tube patency and uterine anatomy. A critical component of HSG is the use of contrast media. Water-based contrast agents, such as contrasodium, are often preferred due to their favorable safety profile. The field of medical physics plays a vital role in ensuring diagnostic image quality while minimizing biological risks from radiation exposure. This article reviews the effectiveness of contrasodium in HSG procedures from a medical physics perspective, comparing it to other contrast agents and examining radiation dose management in women of reproductive age. The study is a literature review of scientific publications from the past decade (2015–2024), including clinical trials, meta-analyses, and international guidelines from the WHO and ICRP. The analysis focuses on imaging physics parameters, contrast efficiency, biological safety, and radiation dose evaluation. Findings indicate that contrasodium provides sufficient radiological imaging with minimal biological risk. Although oil-based contrast agents are associated with higher post-HSG pregnancy rates, they pose greater risks of adverse biological effects. Medical physicists are instrumental in optimizing imaging protocols, managing radiation doses, and selecting exposure parameters in accordance with the ALARA (As Low As Reasonably Achievable) principle. In conclusion, the use of contrasodium in HSG offers an optimal balance between diagnostic efficacy and patient safety. The standardization of evidence-based HSG protocols at the national level is recommended to enhance clinical practice in Indonesia.

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