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BULETIN FISIKA
Published by Universitas Udayana
ISSN : 14114690     EISSN : 25809733     DOI : https://doi.org/10.24843/BF
Core Subject : Health, Science,
Astronomy Energy Materials Science & Nanotechnology Medicine & Pharmacology Physics
Aims and Scope Aims The Journal aims to promote the theory and application in the field of physics and to encourage a vigorous dialogue among scholars and researchers worldwide. It presents original research articles, letters, and review articles, and publishes the latest achievements and developments in physics and related fields. All contributions shall be rigorously refereed and selected based on the quality and originality of the work as well as the breadth of interest to readers. Accepted papers will immediately appear online. The Journal welcomes contributions that the manuscript is written in Indonesian or English. Scope The scope of this journal covers pure and applied physics. The topics include advanced material, optoelectronics, laser applications, biophysics, medical physics, instrumentation, geophysics, environmental physics, and related fields.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 38 Documents
 1   2   3   4 
Comparison of Geoelectric Method with Audio Magnetotelluric Method (ADMT) in Aquifer Position Testing at Udayana University Hospital Rani Junita Marbun; I Nengah Simpen; I Nengah Sandi; Komang Ngurah Suarbawa; Ni Nyoman Rupiasih; Wayan Gede Suharta
BULETIN FISIKA Vol. 26 No. 1 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i01.p10

Abstract

Groundwater is an important resource for supporting life, including at Udayana University Hospital, which requires a stable supply of clean water. This study aims to compare the Wenner configuration geoelectric method with the Audio Magnetotelluric (ADMT) method in identifying the position of aquifers. Measurements were conducted around the hospital borehole with a track length of 230 m for the geoelectric method and 50 m for the ADMT method. The results showed that with the geoelectric method, the aquifer position was detected at a depth of 30-37 m with a resistivity of 77.5-144 Ωm and with the ADMT method at a depth of 30-38 m with a resistivity of 1-3 Ωm. In terms of time, the ADMT method is superior, with a total time of 50 minutes and the geoelectric method with a total time of 3 hours 20 minutes. From the cost aspect, the geoelectric method is more economical, with a tool cost of around Rp 126,000,000, and the ADMT method with a tool cost of around Rp 205,000,000. The ADMT method is more accurate in detecting the position of aquifers with an accuracy of 96% with a depth range of 100 m, while the accuracy of the geoelectric method is 92% with a depth of 37 m. Based on these results, the ADMT method is recommended for more accurate and efficient groundwater exploration.
Expectation Value and Uncertainty of Helium Ion (He+) Electron Position in the Position Space Wave Function at Quantum Numbers n  4 Zidan Afidah; Bambang Supriadi; Rif’ati Dina Handayani
BULETIN FISIKA Vol. 26 No. 1 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i01.p11

Abstract

The positive helium ion consists of two protons and one orbital electron to be viewed as a hydrogenic atom. The use of ions has very potential, especially in the development of spintronic devices and plasma-based sterilization. This study aims to determine the expected value and position uncertainty of He^+ ion electrons. Determination of the expected value and position uncertainty is done by analytical calculation through the Schrodinger method approach, especially the radial part at quantum number n≤4, and numerical calculation with the help of a simulation program. The results showed that the main quantum number and orbital n, l influence the expectation value and position uncertainty. The greater the main quantum number n, the expectation value of electron position decreases and the uncertainty of electron position increases. At the same time, the increase in the orbital quantum number l has an impact on the value, which tends to go down. This research is in accordance with de Broglie's hypothesis about the nature of dualism and the principle of uncertainty in the review of position space.
Study of Diffractive Vector Meson Wave Functions: A Comparison of Boosted Gaussian and Gaussian LC Wave Function Profiles Chalis Setyadi
BULETIN FISIKA Vol. 26 No. 1 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i01.p12

Abstract

In this work, we study the impact of using different vector meson wave functions on the cross-section of vector meson production in high energy diffractive scattering. We compare two commonly used vector meson wave functions, namely the boosted Gaussian and Gaus-LC. By applying these two wave functions to the diffractive vector meson production cross section, the total and differential cross sections are fitted with HERA data to obtain the best values of the free parameters. The results show that the application of different wave functions has no significant effect on the slope and amplitude of the cross-section. The differential cross section as a function of energy pattern, which tends to decrease more rapidly compared to the experimental data, is one of the features of the wave function that needs to be compensated by other components of a model to provide a good description of the data.
Magnetic Property Analysis ZnFe2O4 Magnetic Nanomaterial Derived From Iron Sand Using the Coprecipitation Magnetic Method Indah Nurpriyanti; Elisa Sulistyorini; Mastuki Mastuki
BULETIN FISIKA Vol. 26 No. 1 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i01.p13

Abstract

Iron sand is a natural resource rich in iron oxide compounds such as Fe₃O₄, α-Fe₂O₃, and γ-Fe₂O₃, which have the potential to be developed into functional materials, particularly magnetic nanoparticles. This study aims to analyze the magnetic properties of ZnFe₂O₄ nanomaterials synthesized from iron sand using the coprecipitation method. The synthesis was carried out by dissolving iron sand in HCl, mixing with a ZnCl₂ solution and titrating with NH₄OH until a dark brown precipitate was formed. The precipitate was heated at 200 °C for 2 hours. Characterization was conducted using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Vibrating Sample Magnetometry (VSM). XRD results confirmed the presence of ZnFe₂O₄ phase by JCPDS No. 22-1012, with a crystallite size of 24.9 nm and a lattice parameter of 8.28 Å. SEM images revealed non-uniform particle morphology and agglomeration. VSM results showed a remanent magnetization (Mr) of 0.0016 emu, coercivity (Hc) of 314 Oe, and saturation magnetization (Ms) of 1.540 emu. Based on these results, the material exhibits soft ferromagnetic behavior consistent with the spinel structure of ZnFe₂O₄.
Interpretation of Water Quality Based on Seawater Intrusion Data in Ongkowa Takalar Village Nurul Amelia Malik; Muhammad Arsyad; Sulistiawaty Sulistiawaty
BULETIN FISIKA Vol. 26 No. 1 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i01.p14

Abstract

Ongkowa Hamlet Takalar is a settlement located approximately 500 m from the beach, where the local community still depends on wells at a depth of about 3-5 m as a source of clean water, so it has the potential to experience seawater intrusion. This study aims to analyze well water quality, the structure of the subsurface layer using the Wenner-Schlumberger resistivity method, and interpret the distribution of seawater intrusion based on resistivity and water quality data. In this study, resistivity measurements were carried out on 3 tracks using the GL-4100 Resistivity meter. Water quality testing on 4 water well samples and 1 seawater sample in the laboratory. The resistivity measurement point is located at a distance of 110-1712 meters from the coast, while the well water sampling point is 222-1813 meters from the coast. The results showed salinity levels of 74.348-376.74 mg/L, DHL 26.2-130.7 μS/cm, and TDS 20.9-104.3 mg/L. Well water at the study site is still classified as freshwater and eligible for consumption, with no indication of seawater intrusion. The subsurface lithology consists of limestone, sand and gravel, and basalt. Seawater intrusion was found in limestone with low resistivity at a depth of 3.85-6.75 m located 202 m from the coast, and at a depth of 2-15.9 m, located 100 m from the coast. Well water at a depth of about 3 m at a distance of 220 m from the coast is still classified as fresh water.
Determining the Thickness of Peat Soil in Punggur Kecil Village Kubu Raya Regency Based on Resistivity Values Annisa Putri; Zulfian Zulfian; Joko Sampurno
BULETIN FISIKA Vol. 26 No. 1 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i01.p15

Abstract

Information regarding peat thickness in Punggur Kecil Village, Kubu Raya Regency, West Kalimantan Province, is crucial for supporting various activities. Therefore, this study aimed to determine peat thickness in the village using the resistivity method with a Wenner configuration. Data was collected along four survey lines, each measuring 50 m. The results indicated that the resistivity values of the peat layer ranged from 95 to 282 Ωm. The thickness of the peat soil at the research location varies between 1 to 3.7 m, which can be classified as medium, deep, and very deep peat. These interpretation results align with the validation data from drilling. The layer beneath the peat was identified as clay, with resistivity values ranging from 0.138 to 32 Ωm. Based on these findings, the wooden pile method is the recommended land preparation method for constructing this area.
The Effect of Adding Sugarcane Bagasse Ash on Water Absorption, Compressive Strength, and Fracture of Concrete Blocks Marjuki Marjuki; Dwiria Wahyuni; Asifa Asri
BULETIN FISIKA Vol. 26 No. 1 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i01.p16

Abstract

Concrete block is a material that can be strengthened by utilizing silica from natural materials such as bagasse. Silica (SiO2) in bagasse can be enriched through a high-temperature combustion process. This study aims to see the effect of adding bagasse ash (AAT) as a filler on water absorption, compressive and fracture strength of concrete blocks. Bagasse is first burned in a drum at a temperature of 320 ℃ for 1 hour. The results of the burning of bagasse are sieved using 50 and 150 mesh sieves, then characterized using XRF. The results of the study obtained a silica content of 30%, the highest water absorption of 10.6% in bricks without the addition of AAT and the lowest in bricks with the addition of 150 mesh AAT, which is 7.66%. Concrete blocks with AAT size 150 mesh have the highest density, compressive and fracture strength of 2079.99 kg/m3, 6.448 MPa, and 1.372 MPa. The concrete blocks with the addition of AAT improved in mechanical properties compared to bricks without AAT.
Mesoscale Convective Complex Verification on Heavy Rain in Semarang (Case Study: 13 March 2024) Didik Kurniawan; Binsar Hakim Aritonang; Helena Yaku; Imma Redha Nugraheni
BULETIN FISIKA Vol. 26 No. 1 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i01.p17

Abstract

This study aims to identify the Mesoscale Convective Complex (MCC) pattern during a heavy rain event in Semarang City on March 13, 2024, using Himawari-9 satellite imagery. The analysis was based on Maddox's (1980) criteria, including cloud coverage, duration, and convective system eccentricity. The results show that MCC met the requirements with a 7-hour duration, a maximum eccentricity of 0.9498, and shield and core areas of 108,228 km² and 89,128 km², respectively. MCC produced moderate to extreme rainfall intensities, peaking at 60–70 mm/h. MCC activity began in Semarang and moved southwestward, posing hydro-meteorological disaster risks such as flash floods. This study emphasizes the importance of MCC monitoring for hydro-meteorological disaster mitigation in Indonesia.

Page 4 of 4 | Total Record : 38

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