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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 7 Documents
 1 
Search results for , issue "Vol 21, No 3 (2025)" : 7 Documents clear
IDENTIFICATION OF AREAS AT RISK OF ABRASION APPLICATION OF ELECTRICAL RESISTIVITY TOMOGRAPHY (ERT) METHOD ON NANGAI BEACH, NORTH BENGKULU Saputra, Bayu; suhendra, Suhendra; Halauddin, Halauddin; lidiawati, Liza; Marcelina, Shyaira
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.v21i3.22007

Abstract

A study of the underground structures in areas prone to abrasion of Nangai Beach, North Bengkulu Regency. In this study, 2D images of the subsurface structure at the Nangai Beach site were obtained using the Wenner-Schlumberger configuration, while 3D representations were obtained using the electrical resistivity technique (ERT). To protect coastal materials, the main objective of this research is to identify rock types that are resistant to seawater erosion and measure the resistivity of rocks that can be eroded. In addition, software (ERT LAB 64, View Lab 3D and Res2Dinv) was used to analyze the data by processing it and displaying an image of the resistivity value. The interpretation results show that the coastal zone of the study area is dominated by clays with resistivity (>34 Ωm). The shoreline of Nangai beach consists of shale clay (>> 437 Ωm). Rocks having a resistivity value (437 Ωm) are not easily eroded by erosion in shale clay. This is because the rocks known as shale clay have low porosity, resulting in compact rock density. Restoring damaged soil and planting trees near the coast are two ways to slow down the abrasion process. Keywords: Abrasion, Electrical Resistivity tomography (ERT), 2D/3D, Nangai Beach
Tsunami Modeling In The Mentawai Island As A Study Material For Disaster Mitigation (Case Study: Mentawai Earthquake, October 25, 2010) Khoiridah, Sayyidatul; Prabawa, Septa Erik; ,, Pamudi; Danta, Rama Saputra; Renata, Ahmad Reyhan Cahya; Hamzah, Mochamad Farhan
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.v21i3.22662

Abstract

There was an earthquake in Mentawai on October 25, 2010 which resulted in 509 deaths, 17 people injured, and 11.425 people displaced. Based on this, tsunami modeling was conducted using L-2008 software. This study aims to determine the value of the earthquake source mechanism and conduct tsunami modeling. Tsunami modeling includes earthquake source modeling as a tsunami generator (source modeling), tsunami wave propagation modeling (ocean modeling), and tsunami height modeling (run-up modeling). In this study, bathymetry data and earthquake source mechanism data from the USGS agency were used. The calculation results showed that the Mentawai earthquake had a fault length of 218,78 km, fault width of 45,70 km, and slip of 3,84 m. While the results of tsunami modeling show that the vertical displacemeht value obtained is the maximum value of 1,55 m and the minimum value is -1,55 m. The ocean modeling results show that the tsunami waves reached Sipora Island, North Pagai, and South Pagai at 20 minutes and 50 seconds. While the simulation results of tsunami run up modeling show that the maximum run up is at Sabeugunggu bay with run up value of 6,34 meters. Tsunami run up modeling has an RMSE value of 0,73.
Effect of Carbonization Temperature on Pore Formation and Adsorption Ability of Coconut Shell Activated Carbon with KOH Activator anggita, sheilla rully; Prahesti, Arinda Yukashima Putri
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.v21i3.21624

Abstract

The high adsorption ability of activated carbon can be used in various applications, one of which is as an adsorbent in the water purification process. Coconut shell is one of the materials that can be used as raw material for active carbon due to its high levels of carbon, lignin, cellulose and hemicellulose, and has a large number of pores. Pore formation depends on the temperature, activator, and activation time used. This research aims to form active carbon from coconut shells by varying the carbonization temperature with KOH activator on pore formation and adsorption capacity. Making coconut shell carbon powder is obtained from the carbonization of coconut shells at a temperature variation of 500°C -700°C for 2 hours, then crushed and sieved with a 40 mesh size. The coconut shell carbon powder that has been sifted is then chemically activated by soaking the carbon powder in a 3M KOH activator solution for 24 hours. Next, the activated carbon powder is filtered and rinsed with distilled water (H2O) repeatedly until the pH approaches ±7. The activated carbon was placed in the oven at 120°C for 4 hours. Activated carbon powder was tested using BET for the pore volume and surface area of coconut shell activated carbon and its adsorption capacity for methylene blue dye was tested using a UV-Vis spectrophotometer. The research results show that in general the formation of pores resulting from SEM results increases in number and size as the carbonization temperature increases. The maximum pore volume and surface area obtained at a temperature of 700°C were 2,414 cc/g and 426,692 m2/g respectively. The most optimal adsorption capacity is 3957.15 mg/g at a carbonization temperature of 700°C.
Relativistic Quantum Brayton Engine Based on Two Non-Interacting Dirac Particles in a One-Dimensional Potential Well Nabila, Titis Qorin; Sukamto, Heru; Purwanto, Agus
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.v21i3.22945

Abstract

A quantum heat engine converts heat into work based on the principles of quantum thermodynamics.This study investigates a quantum heat engine composed of two Dirac particles confined in a one-dimensional potential well. The potential well is limited to three discrete energy levels, and the two non-interacting Dirac particles are treated as identical. The system operates under a quantum Brayton cycle, consisting of isobaric and adiabatic processes. The total work output is calculated using the energy levels derived from the relativistic Dirac equation. The efficiency curve is obtained by plotting a theoretical expression as a function of the ratio $L_A/\lambda$, where $\lambda$ is the Compton wavelength. The efficiency increases monotonically with $L_A/\lambda$, approaching an asymptotic maximum, and is further enhanced by larger values of the parameter $\alpha$, which drive the engine toward near-optimal performance.
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.

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