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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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Preliminary study on the potential use of Averrhoa bilimbi L. as a supercapacitor electrode material Rahmi, Lailatul; 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.22.2.125-132

Abstract

The global energy crisis and environmental damage caused by the use of fossil fuels have driven the development of environmentally friendly energy storage technologies, one of which is the supercapacitor. This study aims to explore the potential of Averrhoa bilimbi L. (belimbing wuluh) as a source of activated carbon for supercapacitor applications. Activated carbon from belimbing wuluh pulp was synthesized through a carbonization process at 800°C. Morphological characterization using SEM showed a porous surface that had not yet developed optimally, while EDX analysis identified carbon, oxygen, and magnesium as the dominant elements. Electrochemical characterization was carried out using CV and GCD methods with variations in H2SO4 electrolyte concentration (1, 2, and 3 M). The electrode tested with 1 M showed the best performance, with a specific capacitance of 45.98 F/g (CV) and 96.81 F/g (GCD). These results indicate that belimbing wuluh has potential as a sustainable natural material for the development of environmentally friendly supercapacitors.
Synthesis and characterization of optical properties of barium titanate (BaTiO3) with the addition of moringa, banana, matoa, and ketapang leaves extracts Dewi, Rahmi; Apriwandi, Apriwandi; Hamzah, Yanuar; Sari, Eza Tirta; Butarbutar, Kheny Kernila; Putri, Nadja Melika; Nathania, Nazhiwa; Aritonang, Surya Ardika; Hartini, Titin; Hayati, Fitri; Maslyah, Maharani Nur; Sawitri, Seli Novalin; Komariah, Siti; Nursyahara, Septia; Nuraini, Nasywa; Aisy, Rihla Datul; Safira, Putri; Rusmanianty, Rusmanianty; Pratiwi, Dinda; Adela, Adela; Pasaribu, Veny Sriulina; Azhara, Vina Naomi; Febrita, Ayang
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.22.2.169-174

Abstract

Environmentally friendly synthesis of barium titanate (BaTiO3) nanoparticles was conducted using natural leaf extracts of Moringa oleifera, Musa spp., Pometia pinnata, and Terminalia catappa as green dopants via the sol-gel method. This study aims to evaluate the influence of different leaf extracts on the optical properties of BaTiO3 characterized by UV-Vis spectroscopy. Each sample exhibited distinct absorption spectra, reflecting variations in phytochemical composition among the extracts. The results showed that Terminalia catappa and Pometia pinnata extracts produced the highest band gap values, 3.36 eV and 3.35 eV respectively, indicating optical activity in the ultraviolet region. Musa spp. extract resulted in a band gap of 2.81 eV, while Moringa oleifera extract yielded the lowest value of 2.59 eV. These differences suggest that the type of plant extract significantly affects the optical characteristics of the synthesized BaTiO3. This research highlights the potential use of local biomass in the development of functional BaTiO3-based materials through green synthesis approaches.
Evaluation of noise values and homogenity of CT scan image results on head phantom after daily calibration Samaliwu, Evelin Trivena; Illya, Gregoria
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.22.2.105-110

Abstract

Evaluation of CT scan image quality is a crucial aspect in ensuring accurate medical diagnosis. This research aims to evaluate noise values and image homogeneity of CT scans on a head phantom after daily calibration. Evaluation of these two parameters is critical because high noise can interfere with image contrast and lead to clinical misinterpretation, while low homogeneity may indicate artifacts or system inconsistencies that potentially reduce diagnostic reliability. Measurements were performed using Region of Interest (ROI) at five points (one in the center and four at the edges at 12, 3, 6, and 9 o'clock positions) across six image slices, for both head and body modes. The CT scan system used was Siemens SOMATOM go.Top, with primary scanning parameters for each mode: 120 kV voltage, 265 mA current (head) and 220 mA (body), as well as Hr40f and Br40f kernels. Research results show that the CT number homogeneity values in head mode ranged from -1.96 to 0.81 HU, and in body mode from -1.78 to 1.28 HU; all were within the tolerance limit of 0 ± 4 HU. Noise values for head mode ranged from 3.49 – 3.67 HU and body mode from 4.98 – 5.37 HU, also within standard tolerance limits. These findings indicate that the CT scan system functions properly and meets diagnostic imaging quality standards. Additionally, these results support the importance of implementing periodic quality control as part of improving radiological service quality and strengthening patient safety standards in medical facilities.
Comparison of electrochemical performance of supercapacitor electrodes based on electrolyte solution variation Purba, Rosianna; 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.22.2.133-140

Abstract

The increasing global energy demand has accelerated the progress of renewable energy technologies and the creation of effective energy storage solutions such as supercapacitors. In this study, biomass obtained from the peel of the matoa fruit (Pometia pinnata) was employed as a raw material to produce activated carbon for supercapacitor electrodes. The preparation process consisted of an initial carbonization step, followed by chemical activation using a 0.7 M potassium hydroxide (KOH) solution, and then additional carbonization and physical activation stages. The synthesized material was characterized through density measurements and electrochemical testing, including cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) methods, conducted with KOH electrolytes at concentrations of 2, 4, and 6 M. Results demonstrated that combining chemical activation with pyrolysis yielded better outcomes than physical activation alone, as shown by a decrease in activated carbon density, indicating enhanced porosity and surface area. CV analysis revealed that increasing the KOH electrolyte concentration improved the supercapacitor’s performance, reflected in higher specific capacitance during charge-discharge cycles. Moreover, GCD experiments showed that electrodes treated with 6 M KOH electrolyte achieved the greatest specific capacitance, energy density, and power density, recorded at 170.52 F/g, 23.68 Wh/kg, and 580.00 W/kg, respectively. These findings highlight that activated carbon derived from matoa fruit peel is a highly promising material for supercapacitor electrodes, combining excellent electrochemical characteristics, efficiency, and stable cycling behavior.
Literature study on the effect of exposition factors on image quality in the aspect of gray degree Theos, Nicholas Austrin
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.22.2.67-72

Abstract

This literature study aims to examine the influence of exposure factors on the quality of radiographic images in the field of radiodiagnostics. Three scientific journals were used as research materials, focusing on adjusting tube voltage (kV) and exposure time (mAs) to optimize image quality. Experiments were conducted using Computed Radiography (CR) and Digital Radiography (DR) on different phantoms, such as water in a plastic bag as phantom, ossa manus phantom (hand), and abdominal phantoms. The results of the study indicate that the optimal combination of tube voltage and exposure time varies depending on the density and thickness of the tissues being examined. In conclusion, the proper adjustment of exposure factors is key to obtaining high-quality radiographic images for diagnosing diseases or lesions.
A cosmological inflation model with inverse minimal and non-minimal coupling between scalar fields and curvature tensors Hikmawan, Getbogi; Zen, Freddy Permana
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.22.2.111-118

Abstract

This work reviews the cosmological inflation model involving inverted minimal and non-minimal interactions between the scalar field ϕ and its derivatives with the space curvature tensor. The de Sitter exponential expansion and the decaying scalar field conditions are also reviewed to move the model towards the inflationary condition, where as a generator of inflation, the scalar field must decay at the end of time. The scalar and tensor perturbation equations, their respective spectral indices, and the tensor-to-scalar ratio have been calculated to study the nonlinearity of the reviewed model. It is shown that the spectral indices and tensor-to-scalar ratio of the model are in good agreement with the observational data.
The effect of copper doping on the structural properties and composition of iron oxide nanoparticles of Ulakan Pariaman Beach sand prepared by the ball milling method Fandriani, Diny; Erwin, Erwin
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.22.2.141-148

Abstract

This study explores the utilization of beach sand from Ulakan Pariaman as a source of iron oxide-based magnetic material through processes of separation, refinement, and copper (Cu) doping. The samples were processed using an iron sand separator (ISS) to separate iron oxide from other oxides, followed by treatment with a neodymium iron boron (NdFeB) magnet and ball milling technique with variations in milling time and ball size Cu doping was applied to compositions of (Fe2O3)100-xCux where x = 0; 5; 10; 15; and 20 wt.%, to investigate changes in structural and magnetic properties. XRD characterization revealed the dominance of the spinel phase of magnetite (Fe3O4) and a partial transformation to maghemite (γ-Fe2O3) indicated by changes in peak width and intensity. XRF analysis confirmed a decrease in Fe content and an increase in Cu concentration, suggesting ionic substitution within the crystal lattice. Magnetic susceptibility with higher increasing Cu content, demonstrating a positive effect of doping on the material's magnetic response.
Identification of subsurface structure using the pseudo-gravity method of magnetic data at the geothermal area of Sonai Village and its surroundings, Puriala, Konawe Regency Ratu, Misbayanti Dian; Manan, Abdul; Bahdad, Bahdad; Chahyani, Rani
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.22.2.73-84

Abstract

It has been conducted a geomagnetic research in the geothermal area of Sonai Village and its surroundings, Puriala, Konawe Regency, which aims to identify the structure of the subsurface using the pseudo-gravity method. After performing diurnal and IGRF corrections on the measurement data, the residual magnetic field anomaly is obtained around -150 to 90 nT. Furthermore, transformation process using the pseudo-gravity method is carried out, and the anomaly contour density is obtained around -0.07 to 0.06 mGal. The results of 2D modeling of 2 slices on the residual magnetic anomaly map that have undergone pseudo-gravity transformation show that the subsurface layers of the research area are composed of 3 formations. Layers with density values of 1.5 and 2.5 g/cm3 are thought to be Alluvium Deposits in the form of sand and clay, layers with density values of 2.6 and 2.78 g/cm3 are sandstone and conglomerate in the Alangga Formation, and a layer with a density value of 2.84 g/cm3 is peridotite in the Ultramafic Complex (bedrock layer). In addition, several minor faults were also found, and among them 2 minor faults adjacent to geothermal manifestation are located at coordinates of approximately 4o1’16.149” South Latitude dan 122o7’9.609” East Longitude with a distance of ±15 meters, and at coordinates of approximately 4o1’23.388” South Latitude dan 122o7’24.326” East Longitude which is ±28 meters from the manifestation. These minor faults cut through the peridotite layer and the conglomerate layer, and are thought to be the migration path of hot fluids towards the surface.
Preparation of activated carbon electrodes from orange peel biomass with various separator materials for supercapacitor applications Alamin, Rahmatan Lil; 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.22.2.119-124

Abstract

Activated carbon electrodes from orange peel biomass materials for supercapacitor applications with variety of type separator have been prepared. Activated carbon was prepared by pyrolysis process at 800° under N2 gas envinroment. Electrochemical characterization was tested on avariety of separators, i.e, JR-800-W (using Whatman paper number 40), JR-800-E (using eggshell membrane, and JR-800-O (using orange fruit membrane). The results of chemical measurement for the cyclic voltammetry method on the three samples are capacitance values of 191.82 F/g on JR-800-W, 115.08 F/g on JR-800-E, and 94.17 F/g on JR-800-O. The capacitance value in the galvanostatic charge-discharge method are 174.24 F/g with IR drop of 0.067 for sample JR-800-W, 133.22 F/g with IR drop of 0.14 for sample JR-800-E, and 116.8 F/g with IR drop of 0.36 for sample JR-800-O. Whatman paper separators produce good electrochemical properties, indicating the use of separators can affect the performance of activated carbon electrodes for supercapacitor applications.
Reflectivity of Bragg grating fiber on human respiration using InGaAs photodiode converter system Oktavia, Dian Putri; Saktioto, Saktioto; Hanto, Dwi; Syamsudhuha, Syamsudhuha; Amelia, Rina; 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.22.2.175-178

Abstract

Respiration is a vital process characterized by exchanging oxygen and carbon dioxide. Indicators such as respiratory rate are essential for detecting pathological conditions, such as pneumonia and heart failure. This research aims to develop a respiratory sensor system based on fiber Bragg grating (FBG) as an innovative alternative in high electromagnetic field environments. The system utilizes FBG optical fibers to detect strain changes due to respiratory activity, providing a sensitive, safe, and highly electromagnetic environment-compatible solution. The study used FBG with variations in reflectivity of 30%, 50%, 70%, and 90%. FBGs are installed inside oxygen masks at five different points to monitor wavelength changes during respiratory activity. The measurement method involves an optical system with an interrogator and an electrical method using an InGaAs photodiode converter to convert an optical signal into an electrical signal visualized in LabVIEW. Respondents were tested in three activities: stillness, walking, and running. Variations in sensor reflectivity and position in masks were evaluated to determine sensitivity to respiratory changes. The data is collected as a graph of wavelength against time. The result showed that the change in the wavelength of the FBG correlated with the intensity of respiratory activity. The reflectivity of 90% results in the highest sensitivity, allowing for more accurate detection of strain changes. The position of the sensor at the center point of the mask demonstrates the most linear results, indicating optimal sensitivity. Physical activity, such as running, produces the greatest strain on the optical fiber. This study proves the potential of FBG as a precision medical sensor for respiratory monitoring applications.

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