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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
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Application Of Infra Fiber In Making Nets And Its Efficiency As An Erosion Preventative On Mountain Slope Arpan Hala
BULETIN FISIKA Vol. 27 No. 1 (2026): 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.2026.v27.i01.p10

Abstract

This study aims to analyze the application of palm fiber (Arenga pinnata) in the production of fiber nets and to evaluate their efficiency as an erosion control method on mountainous slopes with a 40° inclination. The palm fiber net was manufactured from natural palm fibers woven into a mesh size of 5 cm × 5 cm and applied as a surface cover on sloping land. The research was conducted in Binajaya Village, Tolangohula District, Gorontalo Regency, from October to December 2024. The research methodology included the fabrication and vertical installation of palm fiber nets following the slope direction, the establishment of experimental plots, and the measurement of soil loss caused by surface runoff. Plots equipped with palm fiber nets were compared with untreated plots as control samples. Rainfall data were obtained from NASA POWER and analyzed together with soil erosion data collected from five rainfall events. The results obtained in this study were, in plot 1 using the net obtained the highest eroded mass of 8.2 kg and the lowest eroded mass of 1.7 kg, and plot 2 without using the net with the highest eroded mass of 23.8 kg and the lowest eroded mass of 5.6 kg. The efficiency of the palm fiber net was 72.1%. These findings demonstrate palm fiber nets effectively reduce soil erosion by decreasing rainfall impact energy, slowing surface runoff, and retaining soil particles. Therefore, palm fiber nets have strong potential as an environmentally friendly, natural-based soil conservation method for erosion control on steep slopes.
Analysis of DVH Curves in Post-Mastectomy Breast Cancer Patients on PTV and Lung OAR Using IMRT Technique Naura Shafila; Jerry Djohan; Saleha Saleha; Ajeng Anggreny Ibrahim; Ayu Harduanti Pratiwi; Sri Dewi Astuty; Syamsir Dewang
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.p01

Abstract

Breast cancer has become the most commonly suffered cancer in society, with approximately 66,271 cases of breast cancer in 2022. Breast cancer treatment can be carried out in various ways, one of which is radiotherapy, which has been proven effective in reducing recurrence rates and cancer symptoms. Treatment Planning System (TPS) is a device used for radiotherapy planning by optimizing the dose. One of the irradiation techniques that can be applied using TPS is the Intensity Modulated Radiation Therapy technique (IMRT). The research method uses the analysis of TPS planning results, namely DVH curve, which displays the dose distribution from the radiotherapy planning. The dose parameters analyzed are the Homogeneity Index (HI), Conformity Index (CI), and the dose comparison on the PTV and OAR according to QUANTEC, ICRU 62 of 1999, and ICRU 83 of 2010. The analysis was conducted statistically using SPSS and descriptively by examining the graphs formed from the calculations. The results obtained are HI values around 0,1–0,8, the CI value is 0,75–0,95, and the PTV95% value at 90% does not meet the ICRU requirement, which is PTV95% > 95%. The limits set by the ICRU are not met in all patients for PTV107%, which is PTV107% < 1%. The dose limits for the OAR lungs are met for all patients. However, in one patient, the dose received was very close to the QUANTEC limit, with the volume receiving a dose of 20 Gy being 29%, which is close to the QUANTEC limit of V20 < 30%.
Solution of Time-Independent Schrodinger Equation (TISE) by Using Finite Difference Approach I Gusti Agung Widagda; Nengah Artawan; I Gde Antha Kasmawan; I Wayan Gede Suharta; Ni Putu Yuni Nurmalasari
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.p02

Abstract

This research investigates the numeric solution of the time-independent Schrödinger equation for the quantum harmonic oscillator by finite difference approach. The harmonic oscillator, described by a quadratic function potential, is a fundamental model in quantum mechanics due to its broad applications, ranging from molecular vibrations to quantum field theory. The time-independent Schrödinger equation is a second-order differential equation that typically poses challenges when solved analytically for complex potentials. The finite difference method become an attractive choice as it transforms the continuous differential equation into a system of linear equations that can be computationally solved through computer programming code. In this study, the spatial domain is discretized, and the second derivative is calculated by using central differences, transforming the TISE into a tridiagonal matrix representing Hamiltonian of system. By finding solutions to this matrix eigenvalue problem, wavefunctions and eigenvalues are obtained. The study results demonstrate that the finite difference approach effectively solves the TISE for the harmonic oscillator. The results obtained by using the finite difference method closely approximate the analytical results. The linear regression results show respectively that the gradient (β1), regression coefficient (β0) and coefficient of determination (R²) approach ideal values of 1, 0, and 1. The z-test results also show that the value of calculated z < critical z, indicating that the wavefunction and probability density, whether estimated by using finite difference approach or analytical methods, are equivalent with confidence level of 95 percent.
Improvement of Google Earth Engine-Based Multi-satellite Rainfall Estimation using Rain Gauge Data in South Sulawesi Prayoga Ismail; Retnadi Heru Jatmiko; Nur Mohammad Farda; Muhammad Arif Munandar
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.p03

Abstract

Precipitation, particularly rainfall, is vital in understanding weather and climate. In Indonesia, the uneven distribution of in situ rainfall observations poses a challenge to accurately measuring surface rainfall. Remote sensing systems and cloud computing technologies, such as Google Earth Engine (GEE), offer potential solutions. This study evaluates the spatial distribution and performance of four multi-satellite rainfall estimates available in GEE, namely CHIRPS, GSMAP, GPM-IMERG, and PERSIANN-CDR, before and after calibration using BMKG rain gauge data in South Sulawesi during the 2018–2023 period. The original multi-satellite data revealed significant discrepancies, with an annual RMSE of 1534 mm/year, a yearly RSQ value of 0.3, and an annual RBIAS of 27% compared to observational data. Among the datasets, O_CHPS demonstrated the best spatial similarity visually. Calibration using the Geographical Differential Analysis (GDA) method effectively enhanced the accuracy, reducing the annual RMSE to 807 mm/year, increasing the yearly RSQ to 0.5, and lowering the annual bias to 1.6%. Improvements were also noted in monthly and daily rainfall estimates. After calibration, C_PRSN exhibited the most favorable spatial distribution and performance, achieving a 26% reduction in annual RMSE, a 105% increase in annual RSQ, and a 101% decrease in annual bias compared to its initial data. Furthermore, sensitivity to elevation and rainfall intensity was enhanced, with improved detection indicators, particularly for heavy to extreme rainfall events. This included a 43% increase in POD, a 262% increase in CSI, and a 42% reduction in FAR.
Effect of Declination and Solar Radiation Intensity on Weather Parameters in 2020-2023 in Padang City Juliana Dekriani; Letmi Dwiridal; Harman Amir; Zulhendra Zulhendra
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.p04

Abstract

Padang City is an area that often has an extreme climate so that it is at risk of potential natural disasters that are difficult to predict. This study aims to determine the effect of declination and solar radiation intensity on weather parameters that occur in Padang City in 2020- 2023. The data used are solar declination data, solar radiation intensity and weather parameter data (rainfall intensity, air temperature and air humidity). The research conducted is quantitative research using secondary data obtained from the Class II Minangkabau Meteorological Station Padang Pariaman. Modeling is done using a surfer to get the contours of declination, solar radiation intensity and weather parameters. The result obtained are obtained are that solar declination reaches a peak point on June 21 with 23.44o LU and on December 21 with 23.44o LS. The higher the solar declination North Latitude Direction the Intensity of solar radiation and air temperature that occurs is higher but not in the solar declination of south latitude direction. The higher the intensity of solar radiation, the lower air humidity and rainfall intensity. December 30, 2022 solar declination is 23.13o LS, solar radiation intensity is 96.62 J/m2s2, air temperature is, temperature 24 o C, air humidity is 89% and rainfall intensity is 46.5 mm. While on June 24, 2021 the declination of the sun is 23.4o LU, the intensity of solar radiation is 155.11 J/m2s2, the air temperature is 27.3o C, the air humidity is 77% and the rainfall is 0 mm.
Diagnostic Reference Levels (DRLs) for SPECT Examinations at the Nuclear Medicine Installation of the RSUD A.W. Sjahranie Samarinda Nadia Rudyanti; Rahmawati Munir; Erlinda Ratnasari Putri
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.p05

Abstract

Diagnostic reference Level (DRL) is an investigational tool used to help optimize patient protection during diagnostic and interventional procedures in nuclear medicine, the administered activity is based on the patient's body weight. This study aims to determine the diagnostic reference levels (DRLs) for SPECT Examinations: Bone Scan using radiopharmaceutical 99mTc MDP, Whole Body Scan using radiopharmaceutical 99mTc MIBI, and Thyroid Whole-Body Scan using radiopharmaceutical 131I. This study included patient aged 15 to 60 years with body weight ranging 35 to100 kg. The DRL was calculated based on the 75th percentile and the results were compared with the BAPETEN DRL and previous research. Finding. The DRLs determined for RSUD AWS Samarinda were 999MBq for Bone Scan examination using 99mTc MDP, 921.3 MBq for Whole Body Scan using 99mTc MIBI and 3145 MBq for Thyroid Whole-Body Scan. Based on results, the DRL of Bone Scan and Thyroid WBS exceed the BAPETEN DRL while the DRL for Whole Body Scan using 99TC-MIBI is below the BAPETEN DRL.
Utilization of Thermoelectric Generators (TEG) to Convert Zinc Roof Heat into Electrical Energy Dintje Pahrudin; Asri Arbie; Dewa Gede Eka Setiawan; Muhammad Yunus; Septiana Kurniasari; Irsan Irsan
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.p06

Abstract

The increasing need for electrical energy due to technological growth requires using sustainable alternative energy sources. One potential energy source is solar energy, which can be converted into electricity through a thermoelectric generator (TEG). This study aims to design an optimal TEG configuration in converting heat from zinc roofs into electricity and to analyze the effect of variations in the shape of zinc roofs on the electrical power generated. The method used is an experiment with variations in the type of zinc roof, e.g. plate, wave, and box, and the TEG circuit configuration, e.g series and parallel. Measurements were made on the temperature, voltage, current, and electrical power generated, both with and without supercapacitors as energy storage. The results showed that zinc plates with a parallel configuration produced the highest electrical power of 0.01372 W, compared to zinc boxes and wave zinc. The parallel configuration proved to be more efficient than the series configuration. In addition, using supercapacitors also increases the electrical power generated and allows for greater energy storage.
Analysis of Multi-leaf Collimator (MLC) Usage on OAR (Organ at Risk) Dose Distribution with IMRT (Intensity Modulated Radiation Therapy) Technique in Nasopharyngeal Cases Shadiqah Fitri; Saleha Saleha; Ayu Hardianti Pratiwi; Ajeng Anggreny Ibrahim; Sri Dewi Astuty; Syamsir Dewang
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.p07

Abstract

Nasopharyngeal cancer is one of the most prevalent types of cancer in Indonesia, accounting for 4.6% of cases according to the 2022 GLOBOCAN report, with radiotherapy using the IMRT technique being the primary treatment method. The MLC plays a crucial role in regulating radiation dose distribution, ensuring optimal dose delivery to the tumor while minimizing exposure to surrounding healthy organs, known as OAR. This study aims to analyze the impact of MLC usage on dose distribution to OAR, particularly the brainstem, chiasm, and spinal cord. This research was conducted through a secondary analysis of radiotherapy treatment planning data from 10 nasopharyngeal cancer patients using TPS at TK II Pelamonia Hospital in Makassar. The analyzed parameters include CI and HI to evaluate dose conformity and homogeneity within the target tumor, as well as the absorbed dose in OAR, which was compared against QUANTEC tolerance limits. The results indicate that CI and HI values fall within the recommended range, suggesting an optimal dose distribution to the target tumor. The maximum dose received by the brainstem and chiasm remained within the safe threshold (<54 Gy), while the spinal cord in two patients exceeded the recommended limit (<45 Gy) by 3.434 and 0.881 Gy. This discrepancy is attributed to factors such as tumor location and volume, anatomical variations among patients, and differences in MLC thickness. The use of MLC in IMRT planning effectively modulates dose distribution; however, further of various planning parameters is necessary in certain cases to ensure dose safety for specific OAR.
Analysis of the Influence of Meteorological Factors on Rainfall Patterns in South Kuta Rizal Afriadi Saragih; I Ketut Sukarasa; Pande Putu Hadi Wiguna; Komang Ngurah Suarbawa; Made Sumadiyasa; I Gusti Agung Widagda
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.p08

Abstract

Rainfall in an area can be influenced by several meteorological factors, including the geographical location of an area, temperature, air pressure, air humidity, wind direction and speed, and other factors. This study aimed to analyze meteorological factors such as temperature, humidity, and air pressure, as well as wind direction and speed, on rainfall in South Kuta. The effect of temperature, pressure, and air humidity variations on rainfall was analyzed using IBM SPSS Statistics 25.0 software with the multiple linear regression method. The impact of wind direction on the distribution of rainfall in South Kuta was analyzed using WRPLOT View software version 8.0.2 with the windrose method. From the study, the multiple linear regression equation was obtained, namely Y = -175.008 + (-0.451) X₁ + 1.212X₂ + 0.094X₃ + 0.093X₄ with an R2 value of 12.8%, which indicates that only 12.8% of these meteorological factors affect rainfall where air humidity has the most dominant influence with a significance value of p <0.05. Wind direction impact analysis produces a windrose showing that during the rainy season, the dominant wind blows from the West, bringing high humidity. In the dry season, the dominant wind blows from the East, Northeast, and Southeast, bringing low humidity.
Seismic Subduction Zone Modeling Based on Earthquake Data in Gorontalo and Surrounding Areas Moh. Ramdan Lipoeto; Dewa Gede Eka Setiawan; Icha Untari Meidji; Meilan Demulawa; Harsano Jayadi
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.p09

Abstract

The Gorontalo region is located in an active tectonic zone, so it has a high level of seismic activity. Understanding the geometry of the subduction zone in this region is important for assessing earthquake hazards and disaster mitigation efforts. This study models the angle and depth of subduction of the subduction plate beneath the surface of the Gorontalo region using earthquake data from the USGS catalog from 1994 to 2024. The analysis was carried out using the vertical section method (cross-section), which divides the study area into three segments, namely A, B, and C. Each segment was analyzed using polynomial regression to determine the subduction pattern. The results show that the megathrust zone is at a depth of < 50 km, while the Benioff zone reaches up to 300 km. The obtained subduction angles are 49.01°-59.09° in Segment A, 6.49°-71.76° in Segment B, and 19.87°-58.15° in Segment C. These results show variations in subduction geometry that reflect the tectonic complexity of the Gorontalo region.

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