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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 454 Documents
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Study of the Existence of the Toba Pyramid Site in Marbun Toruan Village Using a Combination of Geoelectric and Satellite Imagery Methods Olihta Kudadiri; Rahmatsyah; Rita Juliani; Juniar Hutahean; Muhammad Kadri; Togi Tampubolon
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 15 No. 2 (2025)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v15n2.p159-174

Abstract

There has been research studies on the existence of the Toba Pyramid Site with the aim of finding out the subsurface rock structure. Measurements were made using ARES D4 v.47, SN: 06091345. ARES data is processed using Res2Dinv software. The results of geoelectric research show that the resistivity varies from 500 Wm to 3000 Wm estimated as alluvium, sand, gravel, dry gravel, and tuff. In addition to using Res2Dinv software, the data was also processed using surfer 13 software to obtain variations in specific gravity at depths of 5m, 10m, and 15m. In addition to using geoelectric methods, Landsat 8 OLI and USGS DEM satellite images were also used to obtain rock types at the research site. The results of the image interpretation show that the rock types of the study area are tuff and alluvium. This shows that the results of geoelectric and image interpretation are in accordance with the geological map of Marbun Toruan Village.
Comparison Structure Preserving Integrator with Conventional Method in Energy Conservation From Double Pendulum Hilman nuha ramadhan; Novitrian
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 16 No. 1 (2026): Vol. 16 No.1 (2026)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study investigates the long-time numerical behavior of a planar double pendulum formulated as a Hamiltonian system under different time integration schemes. The double pendulum is a benchmark chaotic system in which accurate long term energy behavior is essential for obtaining physically meaningful trajectories. The purpose of this work is to compare a conventional explicit method (classical Runge–Kutta), a Störmer–Verlet, and two structure preserving integrators (implicit midpoint and Gauss–Legendre collocation) in terms of phase space dynamics, energy conservation, and computational cost. The equations of motion are integrated numerically with identical physical parameters, time-step size, and simulation horizon for all methods. Phase plots of the angles and canonical momenta are compared with reference results from the literature to verify the correctness of the implementation. Long time energy behavior is then assessed using scalar error metrics derived from the numerical Hamiltonian, and simple runtime benchmarks are used to evaluate efficiency. The results show that the implicit midpoint and the Gauss–Legendre method provide phase portraits consistent with the reference and maintain the energy close to a single level over long times, whereas the classical Runge–Kutta scheme exhibits a mild but systematic drift. The Gauss–Legendre integrator also achieves the smallest energy errors and the highest throughput, making it the most reliable and efficient option among the methods tested. In other words, for long time simulations of Hamiltonian systems, methods that preserve the symplectic structure are more important than merely increasing the formal order of accuracy. These findings provide a quantitative benchmark for geometric integrators on chaotic systems and form a conceptual bridge toward future structure preserving, data driven models such as Hamiltonian Neural Networks.
The Effect of Sacrificial Agents in the Photodegradation of Methylene Blue Using Ag-Fe3O4 Nanoparticles Frisellya Dirgantari; Nasikhudin; Herlin Pujiarti; Markus Diantoro
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 16 No. 1 (2026): Vol. 16 No.1 (2026)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v16n1.p11-26

Abstract

Organic dyes in water are hazardous pollutants due to their toxic properties. One method capable of decomposing these pollutants is photocatalysis. Magnetite (Fe₃O₄) is an iron oxide that can be used as a photocatalyst material and synthesized using the coprecipitation method. These properties facilitate the separation of impurities from the medium. However, Fe₃O₄ has limited photocatalytic activity, so it needs to be composited with silver (Ag) to increase light absorption. Ag material can be produced using AgNO₃ as a source of silver ions. The resulting catalyst, with the addition of Sacrificial Agent solutions, was tested for photocatalytic Methylene Blue solution. The XRD, EDX, SEM, and Photocatalytic characterization results showed a crystalline Fe₃O₄ structure and appropriate material composition. This study demonstrates that adding Ag can enhance the photocatalytic activity of Fe₃O₄, while adding SA can minimize electron-hole recombination and increase the MB degradation efficiency.
Thermally Driven Phase Transformation and Structural Evolution of Hydrothermally Synthesized MoS2 Muhammad Saukani; Yuli Panca Asmara; Lutvi Vitria Kadarwati; Sadang Husain
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 16 No. 1 (2026): Vol. 16 No.1 (2026)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v16n1.p1-10

Abstract

Molybdenum disulfide (MoS2) is a transition-metal dichalcogenide with tunable physicochemical properties, making it highly suitable for applications in energy conversion, electronics, and environmental remediation. This study investigates the thermally driven phase transformation and structural evolution of MoS2 synthesized via the hydrothermal method. The aim is to explore the phase transition as a function of annealing temperature. XRD and Raman spectroscopy were used to monitor the crystal and phase changes, while SEM and TEM were used to analyze the material morphology. The results showed that the synthesized MoS2 predominantly exhibited the 1T phase, as evidenced by the characteristic Raman peaks. After annealing at 300°C, a complete transformation to the 2H phase occurred, with increased crystallinity and a well-defined trigonal prismatic structure. SEM and TEM analyses revealed that the phase transformation did not significantly alter the material morphology, which retained its flower-like structure. These findings emphasize the importance of controlling phase transformations to optimize material properties, contributing to a broader understanding of MoS2 in various technological fields.

Page 46 of 46 | Total Record : 454

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