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JFA (Jurnal Fisika dan Aplikasinya)
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : 1858036X     EISSN : 24604682     DOI : -
Core Subject : Science,
Physics
JFA (Jurnal Fisika dan Aplikasinya, Abbreviation: J.Fis. dan Apl.) hanya menerbitkan artikel penelitian asli serta mengulas artikel tentang topik seputar bidang fisika (fisika teori, material, optik, instrumentasi, geofisika) dan aplikasinya. Naskah yang dikirimkan ke JFA belum pernah diterbitkan ditempat lain serta tidak dalam proses pertimbangan untuk diterbitkan ditempat lain, dalam bahasa apapun. Studi teoritis, eksperimental, dan praktis sama-sama didorong, seperti juga artikel interdisipliner dan yang timbul dari penelitian dan kolaborasi industri.
Arjuna Subject : -
Articles 604 Documents
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Estimation Earthquake Source Parameters in Mentawai Island Region Using Moment Tensor Husna, Fahmia Zuwidhatul; Sungkono, Sungkono; Fahmi, Muhammad Nurul; Minarto, Eko; Saifuddin, Saifuddin
Jurnal Fisika dan Aplikasinya Vol 21, No 3 (2025)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i3.22563

Abstract

Mentawai Islands is a seismically active zone that often experiences earthquakes due to the interaction of tectonic plates, so it is necessary to analyze the earthquake source parameters to understand its characteristics. This research aims to determine the earthquake source parameters in the Mentawai Islands in 2023 for earthquakes with magnitude Mw ≥ 5.5. Three-component waveform data from GEOFON network is used for moment tensor inversion process in time domain. Waveform data used in the frequency range of 0.01 to 0.025 Hz with a match value of calculation and observation data worth >70%. The results of waveform data analysis show that the earthquake in the study area was caused by tectonic activity characterized by the percentage of Double-Couple (DC) more dominant than Compensated Linear Vector Dipole (CLVD), with shallow depth. In addition, the focal mechanism of the waveform data analysis indicates that the type of fault that causes the earthquake in the study area is a reverse fault. This result is consistent with earthquake catalogs (GCMT, USGS, and GFZ).
2D Magnetotelluric (MT) Modelling for Geothermal System Interpretation Minarto, Eko
Jurnal Fisika dan Aplikasinya Vol 21, No 3 (2025)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i3.22613

Abstract

Geothermal systems are areas beneath the earth's surface that store circulating heat energy. The heat energy stored in the geothermal system can be utilized by humans as an environmentally friendly alternative energy. Determining the geothermal system area requires geophysical exploration methods that have deep enough penetration and can distinguish soil structures based on the value of specific resistance. One method that is effective in determining geothermal systems is the magnetotelluric (MT) method. This method receives electric and magnetic field signals from the induction of subsurface rocks to the electromagnetic wave activity of solar storms and lightning. The signal is then processed to produce a specific gravity value. This type of resistance data can then present the structure of the geothermal system, including impermeable rocks, reservoirs and magmatic intrusion zones. This study also collaborated with supporting geological and geochemical data. The results of the magnetotelluric method analysis for the geothermal system of this study area are suspected to have host rocks with a specific gravity of less than 10 Ωm spread near the surface. Reservoirs that have a specific gravity of 10-40 Ωm are located at a depth of about 1000 m below the surface based on the interpretation of all data.
LITHOLOGICAL IDENTIFICATION USING RESISTIVITY GEOELECTRIC METHOD IN LANDSLIDE AREA IN BENGLE VILLAGE Khaerunnisa, Icha
Jurnal Fisika dan Aplikasinya Vol 21, No 3 (2025)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i3.22812

Abstract

Desa Dlepih, tepatnya di Dusun Bengle, merupakan wilayah yang mengalami bencana tanah longsor pada tanggal 28 November 2017. Bencana tanah longsor ini terjadi di permukiman penduduk dan mengakibatkan 2 orang meninggal dunia sehingga diperlukan tindakan mitigasi. Salah satu langkah awal mitigasi adalah mengidentifikasi litologi di area tanah longsor. Penelitian ini bertujuan untuk mengetahui litologi di area tanah longsor dengan menggunakan metode geolistrik resistivitas dipole-dipole. Pengambilan data dilakukan dengan menggunakan seperangkat instrumen Naniura Resistivity Meter pada empat lintasan pengukuran. Lintasan pengukuran berada pada Formasi Semilir yang terdiri dari batuan sedimen. Hasil penelitian menunjukkan bahwa daerah longsor tersebut terdiri dari lapisan tanah dengan nilai resistivitas 2,32 Ωm – 6,69 Ωm dan ketebalan 1,26 m – 11,39 m, lapisan batulempung dengan nilai resistivitas 6,69 Ωm – 160 Ωm dan ketebalan 11 m – 40,5 m, dan lapisan batuan andesit dengan nilai resistivitas lebih dari 160 Ωm dan ketebalan 5,25 m – 37,71 m.
Waste Classification Model Optimization with Modified MobileNetV3 for Efficient Waste Management Putri Andani; Ramadian Ridho Illahi; I Wayan Sudiarta; Marzuki; Arif Budianto
Jurnal Fisika dan Aplikasinya Vol 21 No 2 (2025): June 2025 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i2.20876

Abstract

The increase in population and economic activity has a significant impact on the amount of waste. Data in 2023 states that waste in Indonesia still cannot be managed properly. One solution to overcome this problem is through recycling with waste sorting as a crucial stage. This research develops a waste classification model using modified MobileNetV3S. The classification process is performed using Convolutional Neural Net- work (CNN) method and parameter fine-tuning. This model is able to classify five different categories of waste, namely plastic bottles, leaves, plastic sheets, paper, and metal. These categories were chosen by considering the common practice in waste classification for recycling purposes. The results show that the validation accuracyreaches 96.2% with a loss value of 0.049. These results can significantly contribute to better and sustainable waste management efforts.
Quantum Square Wells with Capacitive Walls: A Toy Model for Quantum Capacitors Arifin Achmad
Jurnal Fisika dan Aplikasinya Vol 21 No 2 (2025): June 2025 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i2.22083

Abstract

This research aims to determine the energy quantization in a one-dimensional infinite square well modified by capacitive walls. The electric field inside the wall produces a linear potential. The solution to the Schrdinger equation is the Airy function for an infinite square well. Furthermore, the Wentzel-KramersBrillouin (WKB) approach is applied to finite wells, and the energy quantization for both cases based on this modified potential has been derived. In this paper, we also examine the quantum capacitance of the system, which is determined from the density of states and depends on dimensionality. The result of this work is a toy model that does not yet provide a complete complex picture of the quantum capacitance model. However, this model shows similarities in terms of energy dispersion relations and quantum capacitance with several types of graphene systems
The Influence of Cross Equatorial Northerly Surge (CENS) and El Nino Southern Oscillation (ENSO) on ˜ Atmospheric Dynamics in Western Indonesia Jhon Paul Estomihi Togatorop; Sayful Amri; Jerremy Mezac Sopacua
Jurnal Fisika dan Aplikasinya Vol 21 No 2 (2025): June 2025 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i2.22064

Abstract

Indonesia's position between the Asian and Australian continents makes its weather highly sensitive to atmospheric interactions from both regions. This study examines the impact of Cross-Equatorial Northerly Surge (CENS) and El Nino˜ Southern Oscillation (ENSO) phasesNeutral, La Nina, ˜ and El Ninoon ˜ atmospheric dynamics over western Indonesia. The analysis focuses on CENS propagation from the southern South China Sea to the west of the Java Sea, comparing atmospheric responses during CENS-ENSO Neutral, CENS-La Nina, ˜ and CENS-El Nino˜ events. Using ERA-5 reanalysis data and CMORPH precipitation data (0.25◦ spatial, hourly temporal resolution), we analyzed sea surface temperature (SST), outgoing longwave radiation (OLR), precipitation, moisture transport, and divergence. Under neutral ENSO conditions, CENS strengthens the Asian monsoon, enhancing moisture transport and convergence over northern Java, leading to increased deep con-vection and precipitation, while Sumatra and Kalimantan experience moisture divergence and reduced cloud cover. During La Nina, ˜ enhanced moisture transport and convergence extend to Kalimantan, further amplifying convective activity and rainfall. In contrast, during El Nino, ˜ the cooling effect of CENS onthe South China Sea weakens, but moisture convergence intensifies over the Java Sea, triggering cloud development despite suppressed convection. These findings highlight the crucial role of CENS-ENSO interactions in modulating regional weather patterns and extreme events, offering insights for improving weather forecasting, disaster mit-igation, and climate modeling in western Indonesia.
Image Quality Assessment of In-House Phantom for Pediatric Computed Tomography Audiena Gelung Prayitno; Dafa Miftahuddin; Aditya Prayugo Hariyanto; M. Roslan A Gani; Endarko
Jurnal Fisika dan Aplikasinya Vol 21 No 2 (2025): June 2025 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i2.20434

Abstract

Computed tomography (CT) offers several advantages. However, it involves a high dose of radiation exposure. In pediatric CT scans, reducing the radiation dose can lead to increased noise and lower image quality. Generally, there is a significant relationship between radiation dose and diagnostic image quality. This research investigates and analyzes the correlation between low-dose radiation and image quality in pediatric CT scans. This study used in house pediatric phantoms (7 year). Twelve artificial cylinder targets were fabricated with diameters 3, 5, 8, and 10 mm, and CT densities +100, -400, -750 HU. The image quality was performedusing CT-Scan 128 slice with parameters of helical scanning using a low dose and standard dose and using 80 and 120 kV. For Signal noise to ratio (SNR), Contrast to Noise Ratio (CNR), Volumetric CT dose index (CTDIvol), SizeSpecific Dose Estimates (SSDE) also investigated. The effective value of the diameter for 7 years was 20.15 cm. Findings suggest, SSDE for in-house pediatric phantoms was found to be 3.71 mGy for low dose and 6.09 for standard dose. For image quality analysis, the low-dose CT protocol has a detection sensitivity of 100% for targets measuring > 5mm in diameter.
Seismic Hazard Identification in the North Banda Arc Region Using Gutenberg-Richter Law Silvia Lestari; Sungkono
Jurnal Fisika dan Aplikasinya Vol 21 No 2 (2025): June 2025 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i2.22060

Abstract

The North Banda Arc region has a high risk of significant earthquakes due to its complex tectonic configuration. In order to assess seismic hazard potential of the North Banda Arc region, Gutenberg-Richter (G-R) Law is applied using earthquake catalogue from 1970 to 2023. The results are G-R parameters, including Mc, a, and b, where the spatial parameters (a and b values) and temporal parameter (b-value) are applied to investigate the seismic hazard in the North Banda Arc Region. The spatial results show that two regions with high risk to strong earthquakes occur are on eastern Seram Island and between eastern Buru and western SeramIsland, including its smaller islands nearby. On the other side, temporal result shows a decreasing b-value, indicating an increasing effective stress that could lead to a strong earthquake.
Synthesis of Bio-Silver Nanoparticles using Leaf Extract of Cymbopogon nardus and Examination of Their Physical and Anti-Bacterial Properties Synodalia C. Wattimena; Veince B. Silahooy; Philipus J. Patty
Jurnal Fisika dan Aplikasinya Vol 21 No 2 (2025): June 2025 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i2.19847

Abstract

The production of silver nanoparticles using biological methods has become the preferred choice of experts over chemical and physical methods because it is cost-effective, rapid, requires minimal energy, and is environmentally friendly. In this study, antibacterial activities of bio-silver nanoparticles synthesized using leaf extract of Cymbopogon nardus against Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli) were assessed. Using TEM it was found that most of the nanoparticles are spherical, and their diameters vary from 7.0 nm to 31.0 nm with the mean diameter calculated to be 15.7 ± 4.60 nm. The UV-VIS spectrum shows 435 nm as the wavelength of localized surface plasmon resonance while the FTIR spectrum indicates the presence of the extract on the surface of the particles, suggesting the action of extracts as the reducing as well as capping agents. Antibacterial assessment was done using both diffusion disc and spectrophotometric methods, and the results show that the silver nanoparticles can inhibit the growth of both gram-positive (S. aureus) and gram-negative (E. coli) bacteria.
Effect of Carbonization Temperature on Pore Formation and Adsorption Ability of Coconut Shell Activated Carbon with KOH Activator Arinda Yukashima Putri Prahesti; Sheilla Rully Anggita; Hamdan Hadi Kusuma
Jurnal Fisika dan Aplikasinya Vol 21 No 3 (2025): Okt 2025 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i3.10580

Abstract

Activated carbon derived from coconut shells has great potential as an adsorbent for water purifi-cation due to its high porosity. This study investigates the effect of carbonization temperature on pore formation and adsorption capacity of coconut shell activated carbon. Carbonization was conducted at temperatures rang-ing from 500◦C to 700◦C for 2 hours, followed by chemical activation using 3M KOH solution. The activated carbon was then filtered, washed until neutral pH (± 7), and dried. Characterization was carried out using the BET method to analyze surface area and pore volume, while adsorption capacity was determined using a UV-Vis spectrophotometer with methylene blue as the adsorbate. The results show that increasing the car-bonization temperature enhances pore development, as indicated by higher surface area and pore volume. The highest surface area and pore volume were obtained at 700◦C, reaching 426.692 m2/g and 2.414 cc/g, respec-tively. Correspondingly, the highest adsorption capacity was also observed at 700◦C, with a value of 3957.15 mg/g. These findings suggest that carbonization temperature plays a critical role in optimizing the physical characteristics and adsorption performance of coconut shell-based activated carbon.

Page 43 of 61 | Total Record : 604

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