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All Journal Jurnal Fisika FLUX Journal of Physics and Its Applications Progressive Physics Journal
Putri, Devina Rayzy Perwitasari Sutaji
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Astronomy Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Health Professions Materials Science & Nanotechnology Physics

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Evaluasi Sistem Proteksi Sambaran Petir pada Gedung G dan Gedung Science Learning Center Fakultas Matematika dan Ilmu Pengetahuan Alam Fadhil, Achmad Reyhan; Syahrir, Syahrir; Putri, Devina Rayzy Perwitasari Sutaji
Progressive Physics Journal Vol 4 No 2 (2023): Progressive Physics Journal
Publisher : Program Studi Fisika, Jurusan Fisika, FMIPA, Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ppj.v4i2.1042

Abstract

As a building that had been used all day G building and Science Learning Center has an active lightning protector system that can arrest electrons on clouds. Therefore, it necessary to evaluate and measure on lightning protector system that installed on both building. Main purpose of this research is to know the efficieny of the lightning protector systems that installed on G building and Science Learning Center, and also to know equivalent area of the lightning protector systems that installed on G building and Science Learning Center. This reasearch was done by evaluate the system based on risk assesment to know that the lightning protector system is needed or not to be installed on the building and then to calculate the equivalent area from lightning protector system to know the effiency of it, and lastly to measuring resistance of the building it needs Earth Resistance Tester (ERT) so it suit the Threshold Value. The result of this research shows that the lightning protector system on G building has the III efficiency level in value is 85% effiecient and equivalent area in range of 30,559 km2, meanwhile on Science Learning Center building shows that lightning protector system has the IV effieciency level, in value is 80% efficient and equivalent area in range of 20,658 km2.
Penilaian Tingkat Risiko Postur Kerja Menggunakan Metode REBA dan Biomekanika Pada Aktivitas Mengangkat Beban Jordan, Aldi Rizki; Wardani, Pratiwi Sri; Subagiada, Kadek; Putri, Devina Rayzy Perwitasari Sutaji; Natalisanto, Adrianus Inu
Progressive Physics Journal Vol 4 No 1 (2023): Progressive Physics Journal
Publisher : Program Studi Fisika, Jurusan Fisika, FMIPA, Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ppj.v4i1.1021

Abstract

The activity of lifting weights has many risks that can lead to complaints and work accidents such as mistakes in lifting excessive loads, overly bent postures, and other complaints that result in uncomfortable working conditions. This research was conducted to determine the risk level of work posture using the REBA method and biomechanics in lifting weights with different lifting variables. The research were took documentation data, angle and distance measurements by using the Kinovea application, and the data analyzed by using the REBA Assessment Worksheet and biomechanical equations. Based on the results obtained, the activity of lifting burdens on workers from the aspect of the REBA method mostly has a high level of risk category and only 1 worker has a moderate level of risk category. Meanwhile, from the biomechanics aspect, most of them have a risk level in the careful category, 1 worker has a risk level in the safe category, and 1 worker who has lifted a load of 50 kg has a risk level in the dangerous category.
Pengolahan Citra Digital EKG Rumah Sakit Tk.IV Samarinda Setyowati, Anggriya Feby; Wardani, Pratiwi Sri; Putri, Erlinda Ratnasari; Putri, Devina Rayzy Perwitasari Sutaji
Progressive Physics Journal Vol. 5 No. 1 (2024): Progressive Physics Journal
Publisher : Program Studi Fisika, Jurusan Fisika, FMIPA, Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ppj.v5i1.1037

Abstract

In the hospital itself, especially in the MCU Poly Radiology Installation, it is a unit that performs services such as Medical Check Up, making health certificates, and carrying out routine checks at an institution. ECG examination is one of the services most frequently performed routinely by patients. Examinations carried out include medical check-ups, monitoring of long-term therapy, patient to assessment before surgery, individual screening for high-risk jobs, examinations before participating in sporting events, and overall examinations as a condition of employment. This study carried out the process of withdrawing information or object descriptions or identifying objects contained in images by compressing or reducing image data. By using EKG data from TK.IV Samarinda Hospital by carrying out processing stages such as converting analog data to digital, cropping, and applying filters to EKG images. After the filter is applied to the image, it is found that after 5 types of image processing (RGB Image, Grayscale Image, Binary Image, Thresholding Image, and Edge Detection Image) on the results of the ECG signal it can be concluded that the processed signal retains the features of the existing signal and information. . Of the five types of processing methods, the clearest result is conversion to Edge Detection imagery.
Verification of Co-60 Source in Brachytherapy Equipment Using TW33005 Well-Type Chamber Hemelia, Junita; Wardani, Pratiwi Sri; Intifadhah, Sahara Hamas; Zarkasi, Ahmad; Putri, Devina Rayzy Perwitasari Sutaji
Journal of Physics and Its Applications Vol 7, No 1 (2024): November 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v7i1.24100

Abstract

Accidents in brachytherapy have occurred and are documented by the IAEA. These incidents are attributed to various factors, such as inaccurate sources, lack of independent verification, and equipment failures due to inadequate calibration. Verifying radioactive sources is crucial for ensuring patient safety. Verification is conducted to confirm that the measured source activity is accurate and stable. Accuracy and stability of source activity are two essential parameters in verification. Source activity accuracy indicates how closely the measured source activity aligns with the reference source activity, while source activity stability reflects the well-type chamber's ability to produce consistent results over time. This study aimed to verify the Co-60 sources at Dr. Kanujoso Djatiwibowo General Hospital using a TW33005 well-type chamber and analyze the results against national and international standards. The results showed that the Co-60 source activity values remained accurate and stable over five months. The highest accuracy was observed in November 2023 (-2.011%), while the lowest was in October 2023 (-2.397%). The highest stability was recorded in September 2023 (-0.416%), and the lowest in October 2023 (-2.090%). In conclusion, the Co-60 sources at Dr. Kanujoso Djatiwibowo General Hospital met the accuracy standards set by ESTRO and BAPETEN of 3% to 5% and the stability standard set by the IAEA of ±3%. This indicates that the sources are safe for use in brachytherapy.
Improving the Quality of CT Images of Stroke Patients Using the SSDE and K-Means Segmentation in the Radiology Installation of RSUD A.W. Sjahranie Samarinda Putri, Erlinda Ratnasari; Payon, Fransiska Lipa; Missinychrista, Ronel Arida; Putri, Devina Rayzy Perwitasari Sutaji; Wardani, Pratiwi Sri; Subagiada, Kadek
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 21, No 1 (2024): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v21i1.17100

Abstract

Stroke examination using a CT scan is a technique that produces 3D brain images without having to do surgery. The purpose of this study was to determine the dose received by each patient who underwent a CT-scan procedure and to improve the image quality of the results. Optimization of the dose for each patient is based on a comparison between the calculated SSDE value and the DRL in the form of CTDIvol and DLP, which are implemented in Indonesia. Improving the quality of CT-Scan images through digital processing using the segmentation method to determine the stroke area. The method used is K-Means segmentation. The results obtained for the SSDE value are the dose received by the patient which is higher than the dose issued by the device or the  value. However, the SSDE, CTDIvol, and DLP values are still below the DRL standard range set by BAPETEN, so they are still within the safe inspection threshold. The average CTDIvol value, which is the output dose value of the device from 22 patients, was 41.84 mGy and the 75th percentile value was 42.7 mGy. The average DLP value is 1054.08 mGy.cm and the 75th percentile value of the DLP value is 964.13 mGy.cm. The average value of the SSDE value which is the value of the dose received by the patient is 43.39 mGy and the 75th percentile value is 42.440 mGy. Based on these results, the value of the dose received by the patient is higher than the value of the dose issued by the device. Segmentation using the K-Means method with the number of clusters k = 3 produces an accuracy of 86.3%. This means that the patient receives a dose of CT-Scan radiation within safe limits and his image can be processed properly, as evidenced by the high success of the segmentation process.
Co-Authors Adrianus Inu Natalisanto Ahmad Zarkasi Fadhil, Achmad Reyhan Hemelia, Junita Intifadhah, Sahara Hamas Jordan, Aldi Rizki Kadek Subagiada, Kadek Missinychrista, Ronel Arida Payon, Fransiska Lipa Setyowati, Anggriya Feby Syahrir Syahrir Wardani, Pratiwi Sri