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All Journal Jurnal Sains dan Teknologi Nuklir Indonesia (Indonesian Journal of Nuclear Science and Technology) Jurnal Sains dan Teknologi Jurnal Fisika Unand SEMIRATA 2015 JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI JOURNAL ONLINE OF PHYSICS Journal of Physics: Theories and Applications INDONESIAN JOURNAL OF APPLIED PHYSICS Jurdimas (Jurnal Pengabdian Kepada Masyarakat) Royal Jurnal Ilmu Fisika BERNAS: Jurnal Pengabdian Kepada Masyarakat Jurnal Pengabdian kepada Masyarakat Nusantara Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Indonesian Journal of Community Empowerment and Service
Sri Oktamuliani
Departemen Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Andalas, Kampus Unand Limau Manis, Padang, 25163
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Efektivitas Perubahan Fase Material KCl/H2O sebagai Sistem Pendingin Ikan Laut Iqbal Alief; Sri Rahayu Alfitri Usna; Astuti Astuti; Sri Oktamuliani
Jurnal Fisika Unand Vol 13 No 1 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.1.8-14.2024

Abstract

This study aims to determine the effectiveness of phase change material (PCM) KCl/H2Oas a fish cooling system. KCl/H2Ois a eutectic PCM of hydrate salts with a melting temperature of -10.7 °Cand an enthalpy of 273 kJ/kg. The samples tested were Kuwe marine fish with a mass of 1 kg (4 heads). The variation in fish mass to KCl/H2Ois 1:0.5, 1:1, 1:2, and 1:3. The process of changing the temperature of the fish cooling system every time is measured using the DS18B20 temperature sensor. Based on the study's results, KCl/H2Ois effective in reducing fish temperature by -0.22 °C/minute.The use of 2 kg KCl/H2O is effective in maintaining fish temperature in the temperature range of0 to 5 °C for 20 hours, and the use of 3 kg KCl/H2Ois good in maintaining fish temperature in the lower temperature range of -5 to 0 °C for 16 hours. In terms of economy, the cost of handling the fish cooling process using KCl/H2Ois six times greater than conventional cooling, so this system is less recommended.
Estimasi Faktor Transfer Radionuklida Alam Tanah ke Beras dan Dosis Internal Tahunan Pada Penduduk di Sekitar Geotermal Solok Selatan Afifah Nabilah; Sri Oktamuliani; Leli Nirwani
Jurnal Fisika Unand Vol 13 No 1 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.1.96-102.2024

Abstract

Telah dilakukan penelitian tentang nilai faktor transfer radionuklida alam 226Ra, 232Th, dan 40K dari tanah ke beras dan perkiraan dosis efektif tahunan yang diterima penduduk di daerah geotermal Solok Selatan. Tujuan penelitian ini untuk memperkirakan faktor transfer alami dari tanah dan beras dan dosis efektif tahunan penduduk di jalur geotermal Solok Selatan. Penelitian dilakukan pada tiga kecamatan, yaitu pada Kec. Sungai Pagu, Kec. Pauh Duo, dan Kec. Sangir di Kabupaten Solok Selatan dengan total enam sampel tanah dan enam sampel beras. Aktivitas spesifik radionuklida diukur menggunakan spektrometer gamma. Rata-rata konsentrasi radionuklida alam yang diperoleh pada sampel tanah yaitu 226Ra sebesar (17,09 ± 0,75) Bq/kg, 232Th sebesar (30,01 ± 0,99) Bq/kg, dan 40K sebesar (214,1 ± 0,87) Bq/kg. Konsentrasi radionuklida alam yang diperoleh dalam beras yaitu 226Ra dengan rata-rata (59,36 ± 0,33) Bq/kg, 232Th dengan rata-rata (0,10 ± 0,11) Bq/kg, dan 40K dengan rata-rata (37,75 ± 1,58) Bq/kg. Penelitian ini menunjukkan bahwa sampel tanah yang berada pada jalur geotermal memiliki konsentrasi tertinggi yaitu Nagari Koto Baru, Kec. Sungai Pagu. Nilai faktor transfer radionuklida pada beras tertinggi pada unsur 226Ra sebesar 5,59 terletak di daerah Koto Baru. Perkiraan dosis efektif perorangan tertinggi diperoleh yaitu 226Ra sebesar 2,97 mSv/tahun, 232Th sebesar 0,002 mSv/tahun, 40K sebesar 0,022 mSv/tahun. Nilai dosis efektif yang diperoleh tergolong aman untuk penduduk, karena lebih rendah dari batas dosis yang direkomendasikan oleh United Nations Scientific Committee on the Effects of Atomic Radiation, kecuali pada unsur 226Ra yang terdapat pada sampel daerah Koto Baru
Peningkatan Kualitas Citra Radiograf Panoramik Menggunakan Metode Filter Laplacian Haritsul Haq; Sri Oktamuliani; Wulandani Liza Putri; Gunawan Gunawan; Surma Adnan
Jurnal Fisika Unand Vol 13 No 5 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.5.624-629.2024

Abstract

Image quality enhancement of panoramic radiographs using the Laplacian filter method has been carried out. This study aims to improve the quality of panoramic radiography images (Acteon X-Mind Prime 3D) in the radiology installation of RSGM Andalas University. This study used secondary data from 46 panoramic images in .BMP format, which were performed by applying Laplacian filter and evaluating image quality by Structural Similarity Index (SSI), Contrast-to-Noise Ratio (CNR), Contrast Improvement Ratio (CIR) and Spatial Frequency (SF). The results showed that the SSI value was 0.636 ± 0.0732, CNR 5.36 ± 0.412, CIR 0.740 ± 0.124, SF 0.605 ± 0.0983. These results mean that CNR shows good image contrast, SSI shows dissimilarity between the original image and the image after Laplacian filter processing, CIR shows good contrast improvement, while the SF value of 0.749 indicates that the image's ability to display structural details is still lacking. Skewness and Shapiro-Wilk tests indicate that SSI and SF are abnormally distributed, while CIR and CNR are normally distributed. T-test analysis was performed on the CIR and CNR metrics data, which showed that the significance of this study indicated that the Laplacian filter method was significant p < 0.001. Thus, the use of the Laplacian filter method significantly improves the image quality of panoramic radiographs.
Optimizing Doppler Ultrasound Parameters: The Study of Insonation Angle, PRF, and Dynamic Range in Blood Flow Assessment Oktamuliani, Sri; Ishii, Takuro; Saijo, Yoshifumi
Jurnal Ilmu Fisika Vol 17 No 1 (2025): March 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.1.53-62.2025

Abstract

Doppler ultrasound is critical in medical diagnostics for evaluating blood flow and detecting vascular conditions. Accurate blood flow velocity measurements depend on insonation angle, Pulse Repetition Frequency (PRF), and dynamic range. This study optimizes these parameters to enhance Doppler ultrasound performance and diagnostic accuracy. A Xario-100 ultrasound machine and the Doppler 403TM flow phantom were used to evaluate the effects of insonation angle, PRF, and dynamic range on measurement accuracy. Insonation angles of 0o and 60o were tested to assess their impact on aliasing and precision. At 0o, significant aliasing occurred, while 90o, aliasing was minimized. PRF settings were adjusted from 14,000 Hz to 17,900 Hz, with higher PRF extending the Nyquist Velocity from 9.8 cm/s to 37.4 cm/s, reducing aliasing and improving high-flow measurement clarity in the dynamic range from 30 dB to 60 dB, with optimal contrast observed at 50 dB. Histogram analysis revealed a balanced pixel intensity distribution at 50 dB, enhancing the Signal-to-Noise Ratio (SNR). The findings demonstrate an insonation angle of 60o, at PRF 17,900 Hz, and a dynamic range of 50 dB optimal Doppler ultrasound performance. Standardizing these parameters can improve diagnostic accuracy, supporting better patient outcomes in clinical practice.
Education of Disaster Awareness through Disaster Readiness Socialization as an Effort to Increase Community Knowledge around the Nobita Hill Tourism Area on Disaster Mitigation Marzuki Marzuki; Mutya Vonnisa; Harmadi Harmadi; Dwi Pujiastuti; Arif Budiman; Dwi Puryanti; Sri Oktamuliani; Imam Taufiq; Meqorry Yusfi; Rahmat Rasyid; Astuti Astuti; Sri Handani; Sri Rahayu Alfitri Usna; Dian Fitriyani; Elvaswer Elvaswer; Muhammad Arif; Muhammad Kahfi; Naela Amalia Zulfa; Iqbal Ramadhan; Nurul Hasanah; Feriska Handayani Irka
Warta Pengabdian Andalas Vol 31 No 2 (2024)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jwa.31.2.353-361.2024

Abstract

Nobita Hill, a tourist site in Padang City, is undergoing development as a tourist destination that offers a bird's-eye view of Padang City. Unfortunately, the hilly topography with steep slopes increases the risk of landslides in this area. In order to address the problem, the community service team from the Physics Department of Andalas University has carried out a six-month community service program from July to December 2022. It focused on disaster awareness education and used a qualitative approach. This activity aims to socialize disaster mitigation efforts, especially those related to landslides and earthquakes, considering that Padang City is also prone to earthquakes. The results of this activity showed an increase in the knowledge of the local community after the socialization, but repeated activities are needed to achieve optimal results. This ongoing activity is essential to ensure continuous improvement in the community's understanding of disaster mitigation and to support efforts to make Bukit Nobita a disaster-resilient area. Thus, this activity makes a positive contribution to shaping a safe, sustainable, and disaster-resilient tourism environment.
Penerapan Algoritma Deep Learning YOLOv8 pada Platform Roboflow untuk Segmentasi Citra Panoramik Mahdiyah, Luqyana; Oktamuliani, Sri; Putri, Wulandani Liza
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.228-234.2025

Abstract

Dental panoramic image segmentation plays a crucial role in dental diagnosis, as it aids in the identification of dental conditions and other oral structures more quickly and accurately. However, manual segmentation processes are often time-consuming and require specialized expertise. Therefore, Artificial Intelligence (AI)-based technology presents a potential solution to enhance efficiency. This study aims to develop a deep learning algorithm for automatic segmentation of dental panoramic images. The model used was trained with 302 dental panoramic images across 32 classes, encompassing 9009 teeth. The segmentation process was carried out on the Roboflow platform, which provides evaluation metrics to assess the model’s performance. Evaluation results revealed a mean Average Precision (mAP) of 95%, recall of 93.1%, and precision of 93.7%, indicating a high level of accuracy in detecting and segmenting teeth. However, challenges arise in certain image conditions, such as teeth that are reduced to roots or teeth positioned abnormally. Overall, the model demonstrates significant potential to improve the efficiency and accuracy of dental panoramic image analysis. This research contributes significantly to the development of faster and more accurate AI-based dental diagnostic systems .
The Accuracy of TIAC Calculated Using SPECT/CT Imaging Data at 36- and 100-Hours Post Injection and Prior Information in 177Lu-DOTATATE Rizka Mutik Siyami; Sri Oktamuliani; M. Dlorifun Naqiyyun; Intan Apriliani Syaridatul Mu'minah
Jurnal Ilmu Fisika Vol 16 No 1 (2024): March 2024
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.16.1.55-62.2024

Abstract

In internal radionuclide therapy, there is a growing demand for streamlined methods that alleviate the measurement burden on patients and reduce the associated costs of individual dosimetry. This study assessed the precision of the Two Time Point Dosimetry (2TPD) model, a data-efficient approach, compared to the well-established All Time Point Dosimetry (ATPD) model. The investigation involved the analysis of time-activity data collected from the kidneys of seven patients who were administered 177Lu-DOTATATE and underwent SPECT/CT imaging (PMID 3344306). Data points were specifically gathered at the 36-hour and 100-hour post-injection marks. Employing prior information, a monoexponential function was applied to fit the biokinetic data. Consequently, two crucial metrics, TIAC ATPD and TIAC 2TPD, were computed for ATPD and 2TPD, respectively. To provide a benchmark, the TIAC determined via the Hänscheid method was also incorporated for comparison. The comparative analysis revealed that the percentage error between the population ATPD model and the 2TPD model was (3.97 ± 7.85)%, and for the Hänscheid model, it was (1.8 ± 7.9)%. These findings affirm that the accuracy of TIAC values derived from the 2TPD approach, leveraging prior-information fitting, is reasonably satisfactory.
Optimizing Doppler Ultrasound Parameters: The Study of Insonation Angle, PRF, and Dynamic Range in Blood Flow Assessment Sri Oktamuliani; Takuro Ishii; Yoshifumi Saijo
Jurnal Ilmu Fisika Vol 17 No 1 (2025): March 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.1.53-62.2025

Abstract

Doppler ultrasound is critical in medical diagnostics for evaluating blood flow and detecting vascular conditions. Accurate blood flow velocity measurements depend on insonation angle, Pulse Repetition Frequency (PRF), and dynamic range. This study optimizes these parameters to enhance Doppler ultrasound performance and diagnostic accuracy. A Xario-100 ultrasound machine and the Doppler 403TM flow phantom were used to evaluate the effects of insonation angle, PRF, and dynamic range on measurement accuracy. Insonation angles of 0o and 60o were tested to assess their impact on aliasing and precision. At 0o, significant aliasing occurred, while 90o, aliasing was minimized. PRF settings were adjusted from 14,000 Hz to 17,900 Hz, with higher PRF extending the Nyquist Velocity from 9.8 cm/s to 37.4 cm/s, reducing aliasing and improving high-flow measurement clarity in the dynamic range from 30 dB to 60 dB, with optimal contrast observed at 50 dB. Histogram analysis revealed a balanced pixel intensity distribution at 50 dB, enhancing the Signal-to-Noise Ratio (SNR). The findings demonstrate an insonation angle of 60o, at PRF 17,900 Hz, and a dynamic range of 50 dB optimal Doppler ultrasound performance. Standardizing these parameters can improve diagnostic accuracy, supporting better patient outcomes in clinical practice.
Potential Radiological Hazard of Coal-Fired Power Plant Oktamuliani, Sri; Caredek, Puspa Tirta; Wiyono, Muji; Wahyudi, Wahyudi; Kusdiana, Kusdiana
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 14 No 1 (2025): Jurnal Ilmiah Pendidikan Fisika Al-Biruni
Publisher : Universitas Islam Negeri Raden Intan Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/jipfalbiruni.v14i1.25879

Abstract

Coal-fired power plants not only generate electricity but also produce coal ash containing naturally occurring radionuclides, which may pose radiological hazards to workers and nearby residents. This study aimed to assess the radiological risks associated with natural radionuclides present in coal ash and surrounding soil near PT Sugar Labinta, Lampung. To achieve this, samples of fly ash, bottom ash, and soil were systematically collected, and the specific activities of radionuclides radium-226, thorium-232, and potassium-40 were measured using gamma-ray spectrometry with High-Purity Germanium (HPGe) detectors. These measurements served as the basis for evaluating potential radiation hazards. The results showed that the gamma index values for fly ash (zero point seven seven seven), bottom ash (zero point three seven zero), and soil (zero point five one four) were all below the safety threshold (gamma index less than or equal to one), indicating low levels of gamma radiation and minimal radiological risk. Similarly, the external hazard index values ranged from zero point one two six to zero point six zero five, remaining under the recommended limit (external hazard index less than or equal to one). However, several samples, particularly fly ash (up to ninety-nine point zero two five nanogray per hour) and soil (up to sixty-five point five one one nanogray per hour), had absorbed dose rates exceeding the global average set by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). While most soil samples had annual effective dose equivalents below the standard limit of zero point zero seven millisievert per year, fly ash exceeded this value, signaling the need for continued monitoring, especially in residential areas near the power plant chimney. These findings suggest that coal ash and soil around PT Sugar Labinta generally present a low radiological risk. However, ongoing monitoring is essential to detect and mitigate potential long-term exposures. The study contributes valuable data for environmental radiation assessments and supports the implementation of effective radiological protection strategies in coal-fired power plant areas.
Pengelolaan Laboratorium di SMAN 2 Sipora Kepulauan Mentawai Mardiansyah, Dedi; Mahyudin, Alimin; Wildian, Wildian; Dahlan, Dahyunir; Shafii, Mohammad Ali; Zulfi, Zulfi; Rasyid, Rahmat; Milvita, Dian; Astuti, Astuti; Yusfi, Meqqory; Firmawati, Nini; Oktamuliani, Sri
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 6 No. 1 (2025): Jurnal Pengabdian kepada Masyarakat Nusantara Edisi Januari - Maret
Publisher : Lembaga Dongan Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55338/jpkmn.v6i1.4793

Abstract

Laboratorium adalah fasilitas penting dalam pembelajaran fisika di sekolah yang berperan dalam meningkatkan minat dan motivasi siswa untuk mempelajari fisika. Aktivitas di laboratorium umumnya berupa kegiatan praktikum atau demonstrasi. Agar laboratorium dapat berfungsi optimal sebagai media pembelajaran fisika, pengelolaannya perlu direncanakan dengan baik. Berdasarkan hasil observasi di beberapa SMA di Sumatera Barat, ditemukan bahwa banyak laboratorium kurang dikelola dengan baik sehingga keberadaannya tidak efektif. Siswa jarang diajak untuk praktikum, dan peralatan yang sudah disediakan oleh Dinas Pendidikan sering kali jarang digunakan, sehingga banyak yang rusak karena tidak terpakai. Tata letak dan fasilitas laboratorium sering kali kurang rapi dan belum diinventarisasi dengan baik. Guru fisika mengalami kendala dalam melaksanakan praktikum karena tidak tersedia modul atau buku panduan. Akibatnya, kegiatan praktikum yang seharusnya dilakukan di laboratorium kini hanya dilaksanakan di kelas dengan peralatan yang terbatas, sehingga potensi laboratorium tidak dimanfaatkan sepenuhnya. Atas dasar masalah-masalah ini, tim Pengabdian Kepada Masyarakat (PKM) melakukan pembinaan pengelolaan laboratorium fisika di SMAN 2 Sipora untuk mendukung kelancaran kegiatan praktikum dan proses pembelajaran. Tahapan kegiatan PKM meliputi: 1) Sosialisasi tentang pengelolaan laboratorium, 2) Pengembangan Laboratorium Percontohan Implementasi Merdeka Belajar, 3) Diskusi pembuatan alat-alat praktikum sederhana, 4) Diskusi pembuatan modul atau buku panduan praktikum, dan 5) Monitoring awal serta lanjutan di SMAN 2 Sipora.
Co-Authors Adrial, Rico Afdal Afdal Afdal Afdal Afdal Afdal, Afdal Afdhal Muttaqin Afifah Nabilah Ahmad Fauzi Pohan Alimin Mahyudin Arif Budiman Astuti Astuti - Astuti Astuti Astuti Astuti Astuti Astuti Aulia Firma Betta Centaury Caredek, Puspa Tirta Dahyunir Dahlan Damayanti, Elok Dedi Mardiansyah Dian Fitriyani Dian Fitriyani Dian Milvita Dinda Nurul Syifa Dinda Nurul Syifa Dwi Pujiastuti Dwi Pujiastuti Dwi Puryanti Eif Sparzinanda Eli Defira Elistia Liza Namigo, Elistia Elvaswer Elvaswer Faza Atika An'umillah Faza Atika An’umillah Feriska Handayani Irka, Feriska Handayani Fitra Ramadana Fulki Fiarka Gunawan Gunawan Gunawan Gunawan Haritsul Haq Harmadi Harmadi Harmadi Harmadi Harmadi Hasnel Sofyan Imam Taufiq Imam Taufiq Intan Apriliani Syaridatul Mu'minah Intan Apriliani Syaridatul Mu'minah Iqbal Alief Iqbal Ramadhan Iqbal Ramadhan Ishii, Takuro Kaoru Hasegawa Kusdiana Kusdiana Kusdiana Kusdiana Kusdiana Kusdiana Kusdiana Kusdiana, Kusdiana Lazuardi Umar Leli Nirwani Leony Chantika Leony M. Dlorifun Naqiyyun M. Dlorifun Naqiyyun Mahdiyah, Luqyana Marzuki Marzuki Marzuki Marzuki Meqorry Yusfi Mohammad Ali Shafii Mohammad Randy Alhafiz Muhammad Arif Muhammad Arif Muhammad Ilyas Muhammad Kahfi Muhammad Kahfi Muji Wiyono Muldarisnur, Mulda Mutya Vonnisa Naela Amalia Zulfa Naela Amalia Zulfa Nazri MZ Nazri MZ, Nazri Nehru Nehru Nini Firmawati Nunung Nuraeni Nurul Hasanah Nurul Khaira Sabila Pratama, Andra Puspa Tirta Caredek Rahmat Rasyid Rahmat Rasyid Ramacos Fardela Rinnesa Apria Ernando Rizka Mutik Siyami Saijo, Yoshifumi Salim Muhaimin Samsidar Samsidar Samsidar Samsidar Siyami, Rizka Mutik Solly Aryza Sri Handani Tadanori Minagawa Takuro Ishii Trengginas Eka Putra Sutantyo Usna, Sri Rahayu Alfitri Vanessa Illona Giovanni Veithzal Rivai Zainal Viesca Fredilla Hanif Wahyudi Wahyudi Wahyudi Wahyudi Wildian Wildian Wiyono, Muji Wulandani Liza Putri Yoshifumi Saijo Yoshifumi Saijo Yuliandari, Annisa Yusfi, Meqqory Zulfi Zulfi Zulfi Zulfi Zulfi Zulfi, Zulfi