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INDONESIA
Jurnal Fisika Unand
Published by Universitas Andalas
ISSN : 23028491     EISSN : 26862433     DOI : https://doi.org/10.25077/jfu
Core Subject : Science, Engineering,
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
Makalah yang dapat dipublikasikan dalam jurnal ini adalah makalah dalam bidang Fisika meliputi Fisika Atmosfir, Fisika Bumi, Fisika Intrumentasi, Fisika Material, Fisika Nuklir, Fisika Radiasi, Fisika Komputasi, Fisika Teori, Biofisika, ataupun bidang lain yang masih ada kaitannya dengan ilmu fisika.
Arjuna Subject : Fisika dan Astronomi - Fisika Nuklir dan Molekuler, dan Ooptik
Articles 40 Documents
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Search results for , issue "Vol 13 No 4 (2024)" : 40 Documents clear
Analisis Deformasi di sekitar Sesar Cimandiri Akibat Gempa Cianjur 2022 Menggunakan Data Indonesia Continuously Operating Reference Station Fery Kurnia Sandi; Dwi Pujiastuti; Marzuki Marzuki; Vira Friska
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.504-510.2024

Abstract

The preseismic and coseismic deformation due to the 21st November Cianjur Earthquake with a magnitude of 5.6 Mw has been analyzed. This study uses Global Navigation Satellite Station (GNSS) data and 13 Indonesian Continuously Operating Reference Station (InaCORS) daily displacement data to reveal the source of the 21 November 2022 Cianjur earthquake. The InaCORS stations used include BAKO, CANG, CBTU, CJKT, CJUR, CLBG, CLDO, CPTN, CPWK, CROL, CSUM, and CUMI. This research uses GLOBK/GAMIT software and is interpreted in a deformation map. From the data processing results, the deformation pattern of station shifts in the pre-earthquake phase indicates that the movement of the Cimandiri Fault did not cause the 21 November 2022 Cianjur earthquake but was likely caused by a new fault. This is indicated by the difference between the deformation direction of the InaCORS station close to the epicenter and the direction of the Cimandiri Fault movement. The most significant horizontal coseismic deformation was obtained at 43.86 mm at CJUR station, with deformation towards the southeast. The most significant vertical coseismic deformation (uplift) was obtained at 25.9 mm at the CLDO station. 
Penentuan Aktivitas Radionuklida Alam pada Pemandian Air Panas Gunung Panjang dan Gunung Pancar di Kabupaten Bogor Jawa Barat Naela Amalia Zulfa; Rico Adrial; Murdahayu Makmur; Mohamad Nur Yahya; Deddy Irawan Permana Putra; Yogi Priasetyono
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.541-548.2024

Abstract

Research has been conducted on the determination activity of natural radionuclides at hot springs in Bogor Regency, West Java. This study aimed to determine the concentration value of natural radionuclide activity in hot springs. This study used water samples taken from water samples taken from water in two different hot spring locations, namely in Gunung Panjang Hot Spring and Gunung Panjang Hot Spring. Activity concentrations were measured using an HPGe gamma spectrometer for radionuclides 238U, 232Th, and 40K. Activity concentrations for radionuclide 238U ranged from (0.13 ± 0.01) to (33.82 ± 0.24) Bq/L, for 232Th ranged from (0.08 ± 0.01) to (100.30 ± 0.01) Bq/L and 40K ranged from (0.18 ± 0.01) to (416.84 ± 0.09) Bq/L. The concentration values of 238U, 232Th, and 40K are still below the specified threshold. The activity concentration limit of radionuclides recommended by PERKA BAPETEN No. 9 Year 2009 on Intervention Against Exposure from Technologically Enhanced Naturally Occurring Radioactive Material is 1000 Bq/L for 238U and 232Th and 10,000 Bq/L for 40K.
Pemodelan Anomali Magnetik Untuk Identifikasi Struktur Bawah Permukaan Bumi Di Nagari Cupak Kabupaten Solok Ahmad Furqan; Dwi Pujiastuti; Dwi Puryanti; Ardian Putra
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.476-482.2024

Abstract

This research was conducted to determine the distribution of magnetic anomalies in the geothermal area of Nagari Cupak, Solok Regency using geomagnetic methods. Data was collected using a magnetometer at 144 observation points with a distance of 300 m between points. The magnetic anomaly value is obtained from the correction of daily variation’s total magnetic data and correction to the magnetic field value of the 13th generation IGRF (International Geomagnetic Reference Field) reference model. Furthermore, reduction to the poles and continuation upwards with a height of 200 m are carried out to remove noise and separate local and regional magnetic anomalies. After data processing, the total magnetic anomaly value in the area ranges from 1252.8 nT to 2969.4 nT which is categorized as low. The low anomaly value is thought to be caused by the demagnetization of rocks due to the influence of geothermal sources in the subsurface. Furthermore, 2D modeling is carried out by analyzing the magnetic anomaly data and making a cross-sectional incision of the model on the contour of the magnetic field anomaly that has been processed above. Based on the modeling results, the subsurface geothermal system of Nagari Cupak, Solok Regency, consists of a cover rock layer, reservoir layer, and hot rock layer which is suspected to be the heat source of the geothermal system of the study area.
Analisis Korelasi Usia, Massa Tubuh, mAs, dan Dosis Efektif Terhadap CTDIvol dan DLP pada Pemeriksaan CT-Scan Pasien Dewasa Wafi Muthia Dewanti; Dian Milvita; Ramacos Fardela; Ida Bagus Gede Putra Pratama; Sri Herlinda
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.579-586.2024

Abstract

A research study has been conducted on the correlation analysis of age, body mass, mAs, and effective dose with Computed Tomography Dose Index Volume (CTDIvol) and Dose Length Product (DLP) in CT-Scan examinations at the Radiology Department of Dr. M. Djamil Padang General Hospital. The research utilized data from adult patients aged 15 years and above with a standard body mass (60 ± 10) kg in non-contrast CT scans of the head, chest, and abdomen, with a total of 586 patients collected over a period of 3 months. The analysis was conducted using Pearson correlation test. The research results indicate that the effective dose has a very high correlation with DLP, with a coefficient of 1 and mAs has a very high correlation with CTDIvol and DLP, with a coefficient of 0,9. Body mass has a relatively high correlation with CTDIvol and DLP, ranging from 0,4 to 0,7 except in head examinations. Age has a moderately significant correlation with CTDIvol and DLP, ranging from 0,1 to 0,5.
Indeks Kerentanan Seismik Menggunakan Data Mikrotremor untuk Daerah Perbukitan dan Pemukiman di Bukit Nobita Kota Padang Fani Anjelina; Ahmad Fauzi Pohan
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.511-517.2024

Abstract

Research on the seismic vulnerability index on Nobita Hill, Padang City uses the microtremor method. The study was conducted in two areas, namely hilly and residential areas around Nobita Hill. Measurements were carried out using a geophone with three components, a north-south horizontal component, an east-west horizontal component and an up-down vertical component at 7 points in hilly areas and 9 points in residential areas with a recording duration of 30 minutes. The measurement results were then processed using the Horizontal Vertical Spectral Ratio (HVSR) method using Geopsy software and mapped using Surfer 11. The research results show that the Nobita Hill area and the settlements around the hill are not vulnerable to seismicity because both research areas have a small category of seismic vulnerability index. This is characterized by dominant frequency values in the hills ranging from 0.633 - 0.935 Hz, amplification from 0.905 - 1.306, and seismic vulnerability index from 1.234 - 2.622. In residential areas, dominant frequency values were found ranging from 0.645 - 2.983 Hz, amplification from 1.109 - 1.316, and seismic vulnerability index from 0.438 - 1.974. This indicates that both studies are safe in the event of an earthquake. 
Analisis Komponen Angin Zonal dan Meridional Sebagai Penentu Awal Musim di Wilayah Tana Toraja Herniella Tiara Utami; Muhammad Arsyad; Husain Husain
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.549-556.2024

Abstract

The determination of the onset of season typically utilizes the rainfall distribution pattern during the climatological period in the form of a bar graph. However, according to previous research, the prediction of the onset of the season can also use the components of Zonal and Meridional winds. There hasn't been much research related to the onset of season in Tana Toraja; therefore, this study aims to determine the profile of Zonal and Meridional winds at the 850 mb level and their relation to the onset of season in Tana Toraja during the climatology period from 1998 to 2022 (25 years) as well as during El Niño and La Niña events. Reference data for this analysis is sourced from daily precipitation records from the Toraja Meteorological Station and daily Zonal and Meridional wind array model data from the European Centre for Medium-Range Weather Forecasts (ECMWF). The collected data is then visualized through maps and graphs, followed by spatial and descriptive analysis for the klimatologi period, El Niño, and La Niña events. The analysis findings reveal that the rainfall pattern in Tana Toraja is significantly influenced by monsoonal winds, particularly characterized by the prevalence of westerly Zonal winds during the rainy season. The onset of the rainy season typically occurs in early July, with the peak of the rainy season usually observed from mid-March to mid-April. Zonal winds during El Niño and La Niña events notably impact rainfall accumulation in the Tana Toraja region, resulting in variations in the strength of Zonal and Meridional winds.
Sistem Monitoring Suhu dan Kadar Air pada Mesin Pengering Padi Berbasis Internet of Things Syaifurrahman Syaifurrahman; Ayong Hiendro; Abqori Aula
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.483-489.2024

Abstract

Paddy drying is an activity to remove the excess of water content within paddy to achieve a better rice quality during the grinding process. Farmers often determine water level based on experience, such as biting the rice, if the skin breaks, it means the rice is ready to be grinded. This research examines a monitoring system on a paddy drying machine in order to obtain a higher quality paddy to be made into rice. On the machine, there is a hearing element to raise the temperature of the drying tank. The rise of the temperature of the drying tank must be monitored to maintain that the temperature is always within the pre-determined threshold. The monitoring system uses DHT11 and SEN0308 sensors connected to ESP32 module as data processing center, before being displayed on an LCD indicator or a smart phone. Accuracy Test results for sensors show both sensor readings are above 90%. The temperature and water level data of the paddy during the drying process can be seen live on an LCD indicator or a smart phone as an accurate information.
Pengaruh Filter Lowpass Terhadap Kualitas Citra CT-Scan Paru-Paru Sofhia Ulga; Afdhal Muttaqin; Dian Fitriyani
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.587-593.2024

Abstract

A low pass filter can be employed to enhance the quality of lung CT-Scan images by smoothing sharp transitions and reducing noise present in the images. The aim of this research is to implement a low pass filter by applying different weight values. The kernel weights applied in filtering using a low pass filter are 1/6, 1/9, 1/10, and 1/16. This study is a quantitative research employing 102 images. The findings of this study reveal that applying low pass filters with different kernel weights yields varying image qualities. Based on the quality tests of Mean Squared Error (MSE) and Peak Signal to Noise Ratio (PSNR), it was found that the kernel weight of 1/6 produces images with excellent quality at 17,65%, good quality at 28,93%, and fair quality at 53,92%. Meanwhile, with a kernel weight of the 1/9, 36,36% of the images were found to have good quality, while 64% exhibited lower quality. The application of a low pass filter with a kernel weight of 1/10 resulted in 39% of the images being of good quality and 61% of the images being of lower quality. At the kernel weight of 1/16, 2% of the images were obtained with excellent quality, 40% with good quality, and 58% with lower quality. Based on the MSE and PSNR test values, it was found that applying a kernel weight of 1/6 resulted in better image quality compared to applying other kernel weights. From the overall result, it was found that the application of a low pass filter was not suitable for improving the quality of CT-Scan images of the lung, so other methods could be applied to improve the quality of the images.
Karakteristik Koefisien Absorpsi Bunyi dan Impedansi Panel Akustik dari Styrofoam Menggunakan Metode Tabung Zahwa Khairunisa; Elvaswer Elvaswer
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.518-524.2024

Abstract

Research has been carried out regarding the sound absorption coefficient and impedance values of acoustic panels made from Styrofoam material, which aims to overcome sound noise. This research uses the impedance tube method, an acoustic material made from Styrofoam. Acoustic material samples are made from Styrofoam and have various shapes plain, non-perforated, perforated, serrated, ribbed, and hollow. The frequency ranges used in this research are 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz, and 8000 Hz. The results of the study show that the highest sound absorption coefficient value is in the sample with a through hole with a hole diameter of 0.8 cm and a depth of 1.8 cm at a frequency of 1000 Hz, namely 0.99 and the lowest sound absorption coefficient value is at a frequency of 8000 Hz,0.78 in the sample Plain. The highest acoustic impedance value was obtained at a frequency of 1000 Hz, namely 4.16 dyne.s/cm5 with a sample with a through hole. This is influenced by the diameter of the hole and the depth on the surface of the Styrofoam. Styrofoam material can be used as a sound-absorbing material based on the sound absorption coefficient and acoustic panel impedance values. 
Pengaruh Persentase Fly Ash terhadap Sifat Fisik dan Mekanik Papan Beton Ringan dengan Filler Serat Sabut Pinang Hana Aulia; Alimin Mahyudin
Jurnal Fisika Unand Vol 13 No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.452-458.2024

Abstract

Research has been conducted on the effect of fly ash percentage towards physical and mechanical characteristics of lightweight concrete board with coir fiber as a filler. The study was aim to determine the effect of fly ash percentage with areca fiber as a filler on the physical and mechanical properties of lightweight concrete boards. The percentages of fly ash were 0%; 5%; 10%; 15%; and 20% respectively. The size of areca fiber was 0.2%, and the length of the fiber was 1 cm. Samples with 5 cm x 5 cm x 1 cm were used to measure density, porosity, and compressive strength, while samples with 20 cm x 5 cm x 1 cm were used for flexural strength testing. The lightweight concrete board was tested after 28 days. Compressive and flexural strength testing were conducted using a universal testing machine (UTM). Based on the results, the lowest density value was obtained at 20% fly ash content which was 1.06 g/cm3, while the lowest porosity value was obtained at 0% fly ash content which was 26.53%. The density values obtained from the research results were inversely related to the porosity values. The highest compressive strength of lightweight concrete boards without fly ash was achieved, with a value of 36.93 kg/cm2. The highest compressive strength value with fly ash was 30.20 kg/cm2 at 10% fly ash content. The highest flexural strength was 25.5 kg/cm2 at 20% fly ash content. The higher the fly ash content used, the greater the flexural strength value. The density and flexural strength values have met the SNI 03-2105-2006 and SNI 03-2104-1991 standards, but the porosity and compressive strength have not yet fulfilled the SNI standards.

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