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Utama Alan Deta
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Jurnal Penelitian Fisika dan Aplikasinya (JPFA)
Published by Universitas Negeri Surabaya
ISSN : 20879946     EISSN : 24771775     DOI : https://doi.org/10.26740/jpfa
Core Subject : Science, Education,
Astronomy Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) is available for free (open access) to all readers. The articles in JPFA include developments and researches in Physics Education, Classical Physics, and Modern Physics (theoretical studies, experiments, and its applications), including: Physics Education (Innovation of Physics Learning, Assessment and Evaluation in Physics, Media of Physics, Conception and Misconceptions in Physics, hysics Philosophy anPd Curriculum, and Psychology in Physics Education); Instrumentation Physics and Measurement (Sensor System, Control System, Biomedical Engineering, Nuclear Instrumentation); Materials Science (Synthesis and Characteristic Techniques, Advanced Materials, Low Temperature Physics, and Exotic Material); Theoretical and Computational Physics (High Energy Physics, Gravitation and Cosmology, Astrophysics, Nuclear and Particle Phenomenology, and Computational and Non-Linear Physics); and Earth Sciences (Geophysics and Astronomy).
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 2 Documents
 1 
Search results for , issue "Vol. 15 No. 2 (2025)" : 2 Documents clear
Identification of Fault Characteristics in the 2021 Ambarawa Swarm Earthquake Based On Focal Mechanism Analysis Ramadhani, Muhammad Rizal; Khafidh Nur Aziz; Budiarta
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 15 No. 2 (2025)
Publisher : Universitas Negeri Surabaya

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Abstract

Swarm earthquakes occur repeatedly within a certain time frame and occur in the same location with small earthquake strengths. A swarm earthquake occurred in the Ambarawa region of Central Java from October to November 2021. This research aims to determine the characteristics of new faults and the causes of fault activity in the 2021 Ambarawa earthquake. The method used in determining the characteristics of faults that cause swarm earthquakes is P wave first motion polarity recorded by the seismograph. A total of 7 earthquake data were analyzed using the P-wave first motion polarity method which produced compression/dilation data, azimuthal angle, and take-off angle. Analysis of the focal mechanism using compression/dilatation data, azimuthal angle, and take-off angle produces strike, dip, and rake values. The strike value in the focal mechanism of the 2021 Ambarawa earthquake ranges from N 54°, N 69°, N 168° to N 208°, and N 292°. The dip value in the focal mechanism of the 2021 Ambarawa earthquake has a value of 40° to 88°. The rake value in the focal mechanism of the 2021 Ambarawa earthquake has a negative value, indicating that it is a type of normal fault. The characteristics of the cause of the earthquake are caused by local faults in the Telomoyo Volcano area with normal fault types and shear faults. Local fault activity is indicated by the local pressure on the geothermal reservoir that flows magma fluid from the reservoir to the surface.
Development of Hydroxyapatite-Based Bone Phantoms from Blood Cockle Shells: Effect of Material Composition on X-ray Attenuation Putri Irawan, Chika Pricilla; Devina Rayzy Perwitasari Sutaji Putri; Rahmawati Munir; Zetsaona Sihotang
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 15 No. 2 (2025)
Publisher : Universitas Negeri Surabaya

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Abstract

Radiological phantom is a teaching and simulation tool designed to replicate the physical properties and characteristics of human body tissues, primarily for the evaluation of medical imaging. One alternative material for phantom fabrication is the blood cockle shell (Anadara granosa), which contains hydroxyapatite (HA). This study aims to investigate the effect of varying material compositions on the linear attenuation coefficient (μ) of X-rays in bone phantoms, as well as to determine the optimal composition that approximates the reference values of human bone. The research method involved mixing rice bran, resin, and HA powder synthesized from blood cockle shells in varying HA compositions of 20g, 25g, 40g, and 50g. Each phantom was then scanned using  a CT scanner to obtain CT Number values, which represent the linear attenuation coefficient (μ) values. The results showed that the correlation between composition and μ value was not entirely linear, due to the uneven distribution of HA and the presence of voids within the phantom structure. Among the four samples, the phantom with 40 grams of HA (Phantom 3) demonstrated the closest approximation to cortical bone characteristics, with an average CT Number of 1102.15 HU and a μ value of 0.441 cm⁻¹, approximating the attenuation coefficient of human cortical bone. These findings highlight the potential use of waste materials such as blood cockle shells as a main material for bone phantoms that can closely mimic human bone properties.

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