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All Journal BAREKENG: Jurnal Ilmu Matematika dan Terapan IJEMS (Indonesian Journal of Environmental Management and Sustainability)
Mubarokah, Umi
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Agriculture, Biological Sciences & Forestry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Energy Engineering Environmental Science Mathematics Mechanical Engineering Physics Public Health Transportation

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Evaluating the Quality Status and Sustainability of Anggoeya Spring in the Ecological Dimension using the Rapid Appraisal for Springs Method Kahirun; Ramadhan, La Ode Ahmad Nur; Erif, La Ode Muhammad; Mubarokah, Umi
Indonesian Journal of Environmental Management and Sustainability Vol. 9 No. 2 (2025): June
Publisher : Magister Program of Material Science, Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijems.2025.9.2.56-67

Abstract

Water quality is essential for community needs. This study uses physical, chemical, and biological parameters to evaluate the quality and sustainability of Anggoeya Spring, Kendari City. The Southeast Sulawesi Health Laboratory tests assessed compliance with water quality standards, while pollution levels were analyzed using the Pollution Index. Sustainability was examined through the RAP-SPRINGS method, focusing on ecological aspects. Results showed compliance with most standards, except for BOD, COD, and total coliform levels. Anggoeya Spring was classified as lightly polluted but ecologically sustainable. Key sensitive attributes land cover in the catchment area, land cover within a 200 m radius, catchment area criticality, and water source utilization-highlight the need for targeted conservation and rehabilitation efforts. Therefore, prioritizing land and forest management in the catchment area and surrounding zones is crucial for sustaining Anggoeya Spring. This includes the need for improved raw water treatment, especially water treatment technology, due to the high total coliform content in Anggoeya spring water. This study evaluates water quality, determines pollution levels, and analyzes sustainability using the RAP-SPRINGS method. It emphasizes crucial ecological factors for conservation, advocates land rehabilitation, and highlights the necessity of improved water treatment. Ultimately, it contributes to environmental preservation and sustainable water management.
NUMERICAL ANALYSIS OF BLOOD VESSEL CONSTRICTION DUE TO ATHEROSCLEROSIS DISEASE USING FINITE VOLUME METHOD Fatahillah, Arif; Mubarokah, Umi; Megahnia Prihandini, Rafiantika; Wihardjo, Edy; Adawiyah, Robiatul; Hussen, Saddam; Monalisa, Lioni Anka
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 19 No 4 (2025): BAREKENG: Journal of Mathematics and Its Application
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol19iss4pp2661-2678

Abstract

Atherosclerosis is a leading cause of coronary heart disease. This study analyses how elliptically shaped stenoses alter blood-flow velocity in coronary arteries. The governing equations are discretised with the finite-volume method, coupling pressure and velocity through the SIMPLE (Semi-Implicit Method for Pressure-Linked Equations) algorithm and accelerating convergence with the Successive Over-Relaxation (SOR) technique. A weighted Gauss–Seidel iteration whose over-relaxation factor ( in this work) damps low-frequency error modes, cutting the number of iterations needed for residuals to fall below 10⁻⁴ by roughly 40 % compared with the standard Gauss–Seidel scheme. Simulations of 30 %, 50 %, and 70 % constrictions were carried out in MATLAB R2013a and ANSYS Fluent. Quantitative and qualitative cross-validation of the two software packages confirmed consistent velocity and pressure fields, though minor discrepancies arose from differing numerical schemes and model assumptions, underscoring the need for experimental verification. The highest centre-line velocity occurred at 70 % stenosis—0.72075 m/s in MATLAB versus 0.90 m/s in Fluent—while the lowest was recorded at 30 %. Velocity–pressure profiles showed that increasing inlet velocity or degree of narrowing elevates velocity but decreases pressure, with the largest drop (11492.4 Pa in MATLAB; 11747.32 Pa in Fluent) again at 70% stenosis. Study limitations include modelling blood as a Newtonian fluid and idealising arterial geometry; future work should incorporate non-Newtonian rheology and patient-specific shapes to enhance physiological accuracy.
Co-Authors Kahirun, Kahirun La Ode Ahmad Nur Ramadhan La Ode Muhammad Erif Lioni Anka Monalisa, Lioni Anka Megahnia Prihandini, Rafiantika Robiatul Adawiyah Saddam Hussen WIHARDJO, EDY