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Jurnal Fisika FLUX
Published by Universitas Lambung Mangkurat
ISSN : 1829796X     EISSN : 25411713     DOI : -
Core Subject : Science, Education,
Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics
Jurnal Fisika FLUX is a peer-reviewed, open access journal that publishes original research articles, review articles, as well as short communication in all areas of physics including applied physics, which includes: physics instrumentation and computation, biophysics, geophysics, physics materials, theoretical physics, and physics education. Journal use single peer reviewed to publish. This journal is published by Universitas Lambung Mangkurat Press. ISSN 1829-796X (print) and ISSN 2541-1713 (online) Jurnal Fisika FLUX is published twice a year. Articles will be peer reviewed first. Once ready to be published immediately on the current edition.
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Articles 587 Documents
 55   56   57   58   59 
Kantowski-Sachs Cosmology with Perfect Fluid Matter Distribution in the f(R,T) Gravity Theory Muh. Fachrul Latief; A. Indra Wulan Sari Ramadani
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 23, No 2 (2026): 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.v23i2.25432

Abstract

This research investigates the exact solution of the Kantowski-Sachs metric within the framework of  gravity theory, with the matter distribution described as a perfect fluid. The  gravitational field equations are first derived using the modified Einstein-Hilbert action principle. Next, the system of field equations is solved by applying the assumption that the expansion scalar  is proportional to the shear scalar , thus obtaining a relationship between the Kantowski-Sachs metric coefficients. The obtained solution is used to analyze several physical parameters, including the Hubble parameter , spatial volume , expansion scalar , shear scalar , deceleration parameter , and jerk parameter . The results show that the model describes an anisotropic universe that begins from a Big Bang-type singularity, undergoes a decelerating expansion phase, and produces a jerk parameter value greater than the prediction of the  model. These findings indicate a deviation in the expansion dynamics of the early universe, although the interpretation is still limited by the assumption of proportionality  and the selection of a specific form of the function . Therefore, further testing of observational data is necessary to assess the validity of this model.
3D Geospatial Analysis of Soil Unit Weight Using the Radial Basis Function (RBF) and Ordinary Kriging (OK) Methods in Ketahun Sub-district, North Bengkulu Nafisa Auliya; Lindung Zalbuin Mase; Khairul Amri; Rahmat Fahrizal; Rena Misliniyati; Hardiansyah -
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 23, No 2 (2026): 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.v23i2.25927

Abstract

Ketahun is one of the areas in North Bengkulu Regency, Bengkulu Province, which is affected by seismic activity, with geological conditions dominated by sedimentary from Bintunan Formation, which influence soil characteristics for geotechnical planning. Previous research on three-dimensional (3D) geospatial modeling in Bengkulu region was generally limited to soil technical parameters, while  soil unit weight parameters were rarely used. This study aims to make 3D modeling of subsurface structure and soil unit weight distribution (γsat, γb, and γd) in Ketahun using geospatial approach. The research utilize data from field investigations at 15 Cone Penetration Test (CPT) points, which were then empirically correlated determine soil unit weight values. The 3D modeling was built using Leapfrog Geo application, through the Implicit Geological Modeling approach based on Radial Basis Function (RBF), while the distribution of bulk density parameters was estimated using Ordinary Kriging (OK). The validation results showed an R2 (0,95 - 0,96), RMSE (0,48 – 0,55), and MAE (0,34 – 0,46) proving that this 3D model is able to represent the spatial distribution of soil parameters measurably, with consistence parameter relationships, where γsat > γb > γd. The average values obtained for untuk  γsat is 19,77 kN/m3, γb is 19,67 kN/m3, and γd is 15,82 kN/m3. The results of this study are expected to provide insight into the subsurface and distribution of bulk density to further geotechnical analysis for support the planning of earthquake-resistant building structures.
Spatial Assessment of Environmental Quality in Hulu Sungai Tengah Regency Using the Remote Sensing Ecological Index (RSEI) Abraham Prakoso; Ichsan Ridwan; Mufida Asyari; Nurlina Nurlina
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 23, No 2 (2026): 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.v23i2.25129

Abstract

Increasing ecological pressures in Hulu Sungai Tengah Regency (HST), South Kalimantan — driven by deforestation, built-up land expansion, and land cover change — necessitate an objective, spatially-based environmental quality monitoring approach. This study evaluates the ecological quality of HST Regency using the Remote Sensing Ecological Index (RSEI) derived from Sentinel-2 imagery, integrating NDVI, NDMI, and NDBSI through Principal Component Analysis (PCA), replacing the conventional Land Surface Temperature (LST) component with NDMI since Sentinel-2 lacks thermal bands. Annual median composite Sentinel-2 Level-2A imagery for 2019 and 2023 was processed via Google Earth Engine. PC1 explained over 90% of data variance in both years, validating its use as the RSEI basis. PC1 was dominated by NDMI and NDVI in 2019, reflecting natural factors, but shifted toward NDBSI in 2023, indicating growing anthropogenic pressure. Spatially, most of the area was classified as Good–Very Good in both years, with the Very Good class expanding in 2023. This aggregate improvement is more likely attributable to the La Niña climate phase, which temporarily elevated moisture levels rather than reflecting permanent vegetation recovery — as evidenced by a concurrent decline in tree cover. Field validation across all RSEI classes confirmed strong agreement between image classification and actual biophysical conditions. This study affirms that LST-independent Sentinel-2-based RSEI is a reliable ecological monitoring tool for highly heterogeneous tropical regions and provides a scientific basis for sustainable regional development planning.
Static Stress Transfer from The 2010 Mw 7.8 Sinabang Earthquake and Its role in Triggering the Mw 7.2 Meulaboh Event Jhon Eric Natanael Hutabarat; Sendy Diego M.P Lubis; Yudha Styawan; Rizki Wulandari
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 23, No 2 (2026): 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.v23i2.26145

Abstract

This study investigates the mechanical relationship between the 6 April 2010 Sinabang earthquake (Mw 7.8) and the subsequent 9 May 2010 Meulaboh earthquake (Mw 7.2) along the Sumatra–Andaman Subduction Zone (SASZ) using static Coulomb Stress Change (ΔCFS) analysis. Earthquake source parameters and focal mechanisms were obtained from the United States Geological Survey (USGS) catalog. Aftershock sequences associated with the Sinabang earthquake were identified using the Gardner and Knopoff declustering algorithm, while fault geometry was constrained using focal mechanism solutions and empirical scaling relationships. Static stress transfer was modeled using Coulomb 3.3 assuming a homogeneous elastic half space. The results indicate that the Sinabang earthquake generated a positive ΔCFS lobe extending toward the Meulaboh segment, with stress increases penetrating the seismogenic depth range of approximately 20–40 km. Receiver-fault analysis yielded positive ΔCFS values of 0.022 bar and 0.011 bar for Meulaboh Nodal Plane 1 (NP1) and Nodal Plane 2 (NP2), respectively, with NP1 showing better agreement with the regional tectonic setting and aftershock distribution. Validation using 107 aftershocks showed that 63 events (58.88%) occurred within positive ΔCFS regions, supporting a spatial association between stress increase and postseismic seismicity. Although the calculated stress perturbations remain below the commonly adopted static triggering threshold of 0.1 bar (0.01 MPa), the positive ΔCFS values suggest that static stress redistribution may have increased the failure potential of the Meulaboh fault. The 33-day interval between the Sinabang and Meulaboh earthquakes further implies that additional time-dependent postseismic processes may have influenced the timing of fault failure, although these mechanisms were not explicitly modeled in this study. These findings highlight the probabilistic nature of earthquake interactions within active subduction systems and provide insights for future investigations of delayed earthquake triggering and seismic hazard assessment.
Eigenvalue Problems of Symmetric and Antisymmetric Matrices Through Basis Matrix Transformation and Diagonalization of Symmetric Matrices Nisrina Nafisah; Bambang Supriadi; Chilwatun Nasiroh; Niswatul Kariimah
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 23, No 2 (2026): 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.v23i2.25806

Abstract

The eigenvalue problem constitutes one of the fundamental topics in mathematical physics, particularly in quantum mechanics, operator theory, and dynamical system analysis, since physical observables are no longer represented directly by scalar quantities but rather by linear operators expressed in matrix form. In this context, symmetric and skew-symmetric matrices become important objects of study because they exhibit distinct spectral properties, which have direct implications for the interpretation of eigenvalues and eigenvectors in physical systems. This study investigates the eigenvalue problem for symmetric and skew-symmetric matrices through a basis transformation approach and the diagonalization process using a unitary matrix. Symmetric matrices possess a real eigenvalue spectrum and orthonormal eigenvectors, and thus can be diagonalized directly by means of a unitary transformation, as expressed by the relation D=UBU. In contrast, have purely imaginary eigenvalues occurring in conjugate pairs. This study is conducted through both analytical and computational approaches by employing eigenvalue computation algorithms and orthonormalization procedures to construct a unitary basis. The results demonstrate that unitary basis transformations are capable of simplifying the operator representation into a diagonal form, thereby facilitating the analysis of physical systems for both symmetric and skew-symmetric matrices. Accordingly, this study emphasizes that unitary transformations and diagonalization constitute essential mathematical tools for understanding the spectral structure of operators in a wide range of physical problems.
Geological Structure Delineation Based on Forward Modeling and Inversion Using Gravity Methods at the Gemah Field, South Sumatra Basin Putri Yulia Riska; Rintan Ayu Novitasari; Rizka Rizka
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 24, No 1 (2027): Jurnal Fisika Flux: Jurnal Ilmiah FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v24i1.26973

Abstract

The Gemah Field is one of the exploration areas located in the South Sumatra Basin, which exhibits complex geological structures resulting from regional tectonic activity and is one of Indonesia’s key hydrocarbon-producing basins. This study aims to delineate subsurface structures and construct a geological model based on the analysis of gravity data using forward modeling and inversion methods. The data used consist of processed GGMPlus satellite gravity data to obtain Complete Bouguer Anomaly (CBA) values. The processing steps included Bouguer correction, rock density estimation, spectral analysis to estimate the depth of the anomaly source, separation of regional and residual anomalies, and the application of enhancement methods such as Total Horizontal Derivative (THD), Tilt Derivative (TDR), and Tilt Derivative of Horizontal Gradient (TDX) to clarify the boundaries of subsurface structures. The analysis results indicate that the gravity anomaly patterns in the study area are controlled by variations in rock density associated with the presence of geological structures such as faults and changes in subsurface stratigraphic configuration. Modeling results reveal a subsurface stratigraphic sequence consisting of Quaternary Volcanic Rocks, the Muara Enim Formation, the Air Benakat Formation, and the Gumai Formation. This research is recommended to support hydrocarbon exploration and identify optimal well locations. It addresses a gap in previous studies—which lacked a comprehensive integration of enhancement methods and spectral analysis—with the aim of providing a more accurate picture of subsurface conditions. 
Characterization of The Vadose Zone Using the Vertical Electrical Sounding (VES) Method at the ITERA Botanical Garden Alya Maylisa Putri; Rizka Rizka
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 24, No 1 (2027): Jurnal Fisika Flux: Jurnal Ilmiah FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v24i1.27040

Abstract

The ITERA Botanical Garden is a plant conservation center in Lampung Province that requires information on vadose zone characteristics to support water availability for its vegetation. This study used the Schlumberger configuration of the Vertical Electrical Sounding (VES) method to identify subsurface lithology, characterize the vadose zone, and estimate rock porosity based on resistivity interpretation. The results show that the subsurface lithology consists of five main layers: topsoil, tuffaceous sandstone, tuffaceous claystone, and tuff, with resistivity values ranging from 2.00 to 521.00 . The thickness of the vadose zone varies from 15 to 43 meters, with estimated porosity ranging from 11.18% to 21.82%. Thicker zones indicate a deeper groundwater table and slower infiltration processes, while thinner zones have the potential to accelerate water entry into lower layers but offer less natural protection against the risk of contamination. Differences in porosity values between layers reflect the varying capacity of rocks to store and release water, depending on their lithological type and physical properties. These findings can serve as a reference for ITERA Botanical Garden managers in identifying areas that should be prioritized for groundwater conservation, as well as areas vulnerable to contamination, thereby supporting more effective water management planning in the region.

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