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ORBITA: Jurnal Pendidikan dan Ilmu Fisika
Published by Universitas Muhammadiyah Mataram
ISSN : 24609587     EISSN : 26147017     DOI : https://doi.org/10.31764/orbita.v8i2.10197
Core Subject : Science, Education,
Education Physics
ORBITA: Jurnal Kajian, Inovasi, dan Aplikasi Pendidikan Fisika invites and welcomes the submission of advanced research and review papers, innovations and developed selected conference papers that have never been previously publicized. This journal provides publications and a forum to the academics, scholars and advanced level students for exchanging significant information and productive ideas associated with all these disciplines. The relevant topics of the latest progressive findings or developments will be taken seriously into consideration, the topics covered by the journals include: Physics Education : Physics learning innovation; Physics learning methods, models, and approaches; Physics learning media; ICT in Physics learning; Physics learning evaluation and assesment; Etnophysics. Ecophysics Applied Physics : Theoretical and computational physics; Instrumentation physics; Geophysics; Material Physics; Biophysics and Medical Physics.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 276 Documents
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Exploration of physics principles in bola rai' design based on local knowledge Fajriyani, Fajriyani; Anugra, Novia; Fadila, Fadila; Putri, Amelia
ORBITA: Jurnal Pendidikan dan Ilmu Fisika Vol 11, No 1 (2025): May
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/orbita.v11i1.31672

Abstract

Exploration of Physics Principles in Bola Rai' Design Based on Local Knowledge. This study aims to explore the application of physics principles in the design of Bola Rai’, a floating house constructed based on local knowledge of the community around Lake Tempe. The research employs a qualitative descriptive approach, utilizing interviews, observations, and documentation techniques in Dusun Salomate, Limpomajang Village, Soppeng Regency. Primary data from interviews and observations were supplemented with secondary sources from literature. The analysis reveals that the design of Bola Rai’ applies physics principles such as Archimedes' principle, hydrostatic pressure, weight, and pressure within the raft structure. Additional physics concepts are applied to the house’s pillars, including weight, Newton's laws, and pressure. The walls demonstrate principles of aerodynamics, heat transfer, thermal conductivity, and Pascal’s law, while the roof structure incorporates principles of pressure, weight, and thermal conductivity. The study concludes that physics principles have been effectively integrated into the design of Bola Rai’ through the adaptation of local knowledge, suggesting its potential as a source for contextual physics learning.
Optimizing bladder volume to minimize OAR dose in cervical cancer HDR intracavitary brachytherapy: an experimental and analytical dosimetric investigation Ariani, Tami Oktavia; Wirawan, Rahadi; Marzuki, Marzuki; Subroto, Rinarto; Makmur, I Wayan Ari; Qomariyah, Nurul
ORBITA: Jurnal Pendidikan dan Ilmu Fisika Vol 11, No 2 (2025): November
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/orbita.v11i2.35552

Abstract

This study aims to determine the optimal bladder volume that can balance the dose distribution to the organs-at-risk (OARs), specifically the bladder and rectum, and to analyze the relationship between variations in bladder volume and the dose received by these two organs during high-dose-rate (HDR) brachytherapy. Six bladder volume variations, namely empty, 100 cc, 150 cc, 200 cc, 250 cc, and 300 cc, were used to analyze the correlation between bladder volume and the radiation dose received by the bladder and rectum. An experimental approach was employed by observing the dose point distribution and the D2cc dose to both organs based on calculations from the Treatment Planning System (TPS), which were then compared with analytical calculations using a quadratic polynomial regression model via the Ordinary Least Squares (OLS) method. In general, the bladder point dose and D2cc dose increased with increasing bladder volume; however, the rectal dose demonstrated very high stability (90-100 cGy). Based on the variations in bladder volume, the optimal volume was 100 cc, as it protects the bladder by minimizing dose distribution and stabilizes the dose to the rectum. The statistical analysis results showed that the quadratic regression model had a high goodness-of-fit to the experimental data, with a coefficient of determination (R²) value of 0.92.
A development of an IoT-based temperature-TDS monitoring system for shrimp cultivation pond Akhyar, Halil; Budianto, Arif; Rahayu, Susi; Alaydrus, Alfina Taurida; Anggriani, Ni Ketut; Wardi, Palaivia Harman; Pranahita, Dewa Dwi; Andini, Mira
ORBITA: Jurnal Pendidikan dan Ilmu Fisika Vol 11, No 2 (2025): November
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/orbita.v11i2.36423

Abstract

High-quality water resources are important parameters for the sustainability of human civilization, the health of ecosystems, and the advancement of vital sectors. High-quality water is also needed for shrimp cultivation ponds. However, water-quality monitoring in the estuary is limited. In line with this, this study focuses on the design and implementation of an IoT-based TDS and temperature measurement system for estuarine water, aiming to develop an efficient, accurate, and automated prototype to support the fisheries sector in West Lombok regency. This study used a microcontroller, temperature and TDS (total dissolved solids) sensors, a wireless router, and a display. These elements were developed as a water-quality-level monitoring system based on TDS and temperature. The system was calibrated using a standard comparator before being examined under real conditions. The calibration procedure was conducted inside a controlled chamber at a water temperature of 25°C for 60 minutes, with a steady flow rate. All procedures were repeated three times and tested using a Student’s t-test. The IoT platform was tested using RSSI values with a 2s update interval. The calibration data were interpreted as a linear function between the standard and the developed system. The resulting design shows that the developed system can be installed at a shrimp cultivation pond with good performance. The designed system has a linearity of more than 90%. The system has a reliable accuracy level over 30 consecutive measurement days, resulting in the percentages of 85% to 93% (average = 91%). It can be concluded that IoT data communication via a wireless internet router performs well, with RSSI> -50 dBm for both sending and receiving. The IoT platform using ThingSpeak shows good performance (good stability), with a 2-second interval between data updates.
Integration of magnus thermodynamic parameters and machine learning algorithms in rainfall prediction Aprilia, Ayu; Zakiya, Hanifah; Pauzi, Gurum Ahmad; Supriyanto, Amir; Syafriadi, Syafriadi
ORBITA: Jurnal Pendidikan dan Ilmu Fisika Vol 11, No 2 (2025): November
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/orbita.v11i2.34505

Abstract

Atmospheric physics is very useful in predicting rainfall, particularly for analyzing air saturation conditions as a prerequisite for condensation. This study aims to model rainfall prediction using thermodynamic parameters, namely relative humidity (RH) and dew point temperature difference (ΔT). These parameters were collected from BMKG Lampung meteorological data (2022–2024) and processed using the Magnus equation. ΔT is important as a sensitive indicator of air unsaturation. The data were statistically analyzed and modeled using a Gradient Boosting Classifier. The results obtained indicate a strong correlation between RH and ΔT and rainfall events (point-biserial correlation of 0.475). Furthermore, ΔT during rainfall is lower (average 2.87°C) and stable, indicating near-saturation conditions. During the evaluation stage, the model achieved 76% accuracy and 84% recall during rainfall. The model's good performance proves the effectiveness of physical parameters as predictive features. Finally, the model was implemented in a Flask-based web application for practical accessibility.
Development of a basic physics practical guide with PhET interactive simulation on the topic of kinematics and dynamics Puspitasari, Wahyu Dwi; Febrinita, Filda; Andrea, Tarra Hyuga
ORBITA: Jurnal Pendidikan dan Ilmu Fisika Vol 11, No 2 (2025): November
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/orbita.v11i2.35290

Abstract

Due to the lack of practical tools for supporting Basic Physics lecture activities, lecturers have turned to PhET Interactive Simulations. However, there is currently no guide to help lecturers and students conduct practical activities using these simulations. This research aimed to develop a guidebook for Basic Physics practicum activities utilizing PhET, evaluated by experts and small-scale users for feasibility. The research followed Borg and Gall’s R&D model, consisting of: (1) data collection, (2) planning, (3) product development, (4) product validation, (5) product revision, and (6) product trials. Data were gathered through observation, interviews, and questionnaires. Product validation was carried out by three experts—one each in material, media, and language. A small-scale product trial involved five randomly-selected students from the 2024/2025 Academic Year. Validation and trial data were analyzed by comparing scores to the maximum possible per question. The resulting product was a basic physics practicum guide using PhET for kinematics and dynamics. Expert validation indicated: (1) very worthy (3.88) by the material expert; (2) worthy (3.12) by the media expert; and (3) very worthy (3.80) by the language expert. The small-scale trial produced an average feasibility score of 3.33. Further research should include large-scale trials of the guide.
Evaluation of the influence of factors on CTDIvol and CNR in CT-Scan thorax procedures Sari, Nadhia Nortania; Fendriani, Yoza; Pujaningsih, Febri Berthalita
ORBITA: Jurnal Pendidikan dan Ilmu Fisika Vol 11, No 2 (2025): November
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/orbita.v11i2.35562

Abstract

This study investigates the effect of exposure parameter variations in CT-Scan on image quality and radiation dose during thoracic examinations. The exposure parameters analyzed were tube voltages of 80, 100, and 120 kV, along with tube currents of 100, 200, and 300 mA. A quantitative approach was employed using a Cannon TOS air phantom at the Radiology Department of Bhayangkara Hospital Jambi with a Toshiba 16-slice CT-Scan unit. Radiation dose was obtained from CTDIvol  values displayed on the CT console, while image quality was evaluated using the Contrast to Noise Ratio (CNR) calculated with RadiAnt DICOM Viewer software. The research method included obtaining the Computed Tomography Dose Index volume (CTDIvol) directly from the scanner console for each exposure setting, while the Contrast-to-Noise Ratio (CNR) was calculated by measuring the mean intensity of the region of interest (ROI) on the phantom and the standard deviation of the background area to quantify image contrast relative to noise. The findings demonstrate that both tube voltage and current strongly influence CTDIvol and CNR. Higher exposure settings increased radiation dose, with several combinations exceeding the recommended safety threshold. At 100 mA, all tube voltages remained below the BAPETEN regulatory limit of 11 mGy for non-contrast thoracic scans. Similarly, 200 mA at 80 and 100 kV remained within safe limits, while 200 mA at 120 kV slightly exceeded the threshold. Doses rose markedly at 300 mA, particularly at 120 kV, reaching values far above the permissible limit.

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