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Risk-Based Zoning for Urban Flood Mitigation Using HEC-HMS–HEC-RAS 2D Areas
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2026)
This study aims to assess the potential for urban inundation and formulate flood mitigation strategies based on spatial analysis. A 2D modelling approach using HEC-HMS and HEC-RAS was applied to simulate the extent and depth of inundation in the urban area of Karanganyar, Indonesia. The models were validated with field observations using RMSE. Model validation confirmed the agreement between simulated and observed data. Validation was quantified using RMSE = 0.42 m across 15 checkpoints, with an...
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Geopolymer Bio-Patch Repair: Microbially-Induced Calcite and Pozzolanic Fly Ash and Rice Husk Ash for Corrosion-Resistant of Reinforced Concrete Repair
Pinta Astuti
; Angga Jordi Wisnu Nouvaldi
; Aprilia Rahmayanti
; Pramudya Surya Shabura
; Muhammad Etandra Fara Adzani
; Dylan Ataa Tsany
; Adhitya Yoga Purnama
; Rahmita Sari Rafdinal
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2026)
Indonesia’s archipelagic environment subjects concrete structures to severe corrosion and sulfate attacks, necessitating sustainable repair solutions. This study evaluates a geopolymer-based bio-patch repair mortar utilizing fly ash (FA), rice husk ash (RHA), and Bacillus subtilis bacteria to induce Microbially Induced Calcite Precipitation (MICP). While the silica-rich ashes act as pozzolanic materials, the bacteria enhance durability by reducing oxygen levels and lowering corrosion rates. Micr...
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Graph-Theoretical Approach to Clusters – Analysis of Clusters with 5–11 Vertices –
Sekine, Rika
; Hayakawa, Shogo
; Taki, Sota
; Sato, Moemi
; Ikegaya, Haruki
; Kimura, Hiroto
; Nakata, Tomoya
; Murono, Ayumi
; Kobayashi, Yosuke
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2026)
In this study, we systematically analyzed all isomers of 5–11 atom clusters using a graph-theoretical approach and evaluated their maximum Hückel energy (HE) within the Hückel approximation. The maximum HE increased with the number of bonds, reached a maximum at an intermediate value, and then decreased again, with the peak located near the average of the minimum and maximum possible edge numbers. This relationship was well reproduced by a simple linear expression. The isomers with maximum HE we...
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The Effect of Lean Management on Innovation Performance: How Absorptive Capacity Affects Food Manufacturing Industry?
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2026)
This study analyzes the effect of Lean Management Practices (LMP) on Innovation Performance (IP) through the mediating role of Absorptive Capacity (AC) in Indonesia’s food and beverage industry. A structured questionnaire adapted from validated instruments (Gaspersz, 2007; Cohen & Levinthal, 1990; Damanpour, 1991) was distributed to 200 managers and supervisors from food manufacturing firms listed in the Indonesian Ministry of Industry registry, yielding 180 valid responses (90% response rat...
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Kernel Density and Spatial Modeling of Informal Settlement Concentration: Methodology and Findings from Palembang, Indonesia
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2026)
Rapid urbanization has intensified the growth of slum settlements in Indonesian cities, including Palembang, where informal housing commonly develops along riverbanks. This study aimed to identify and evaluate the spatial distribution and density of slum areas in Palembang City through a Geographic Information System (GIS)–based approach combining Kernel Density Estimation (KDE) and Receiver Operating Characteristic–Area Under Curve (ROC–AUC) analysis. Primary spatial data were obtained from 382...
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Effect of NaOH Molarity on Gel Formation at the Geopolymer–Artificial Aggregate Interface for Pavement Applications
Saputro, Yayan Adi
; Adnan
; Mohammad, Gunawan
; Hidayati, Nor
; Muna, Nando Nilna
; Ningrum, Aprilia Citra
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2026)
This study investigates the effect of NaOH molarity (10, 12, and 14 M) on gel formation at the geopolymer–artificial aggregate interfacial transition zone (ITZ) for sustainable pavement binder courses. The study focuses on microstructural and chemical characteristics rather than direct mechanical performance. Using XRF, FTIR, and SEM–EDX analyses, the evolution of gel phases from N-A-S-H to hybrid N/C-A-S-H at the interface was systematically characterized. Increasing NaOH molarity enhanced alum...
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GIS-Based Spatial Equity Assessment of Temporary Waste Disposal Sites in Riverbank Informal Settlements: A Case Study of Palembang, Indonesia
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2026)
Rapid population growth and urbanization in informal settlements along the Musi Riverbank, Palembang City, have intensified pressure on the waste management system, particularly due to the uneven distribution of Temporary Disposal Sites (TPS) and limited collection services. This study, conducted in June–July 2025, examines the spatial conditions of TPS and waste management through a quantitative methods approach that integrates Geographic Information Systems (GIS) with a survey of 385 responden...
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AI Integration in English Language Teaching: Junior High School Teachers’ Perceptions and Readiness in Ogan Ilir, South Sumatera
International Journal of Research in Education
Vol 6
, No 1
(2026)
Artificial Intelligence (AI) is increasingly reshaping educational practices worldwide, particularly in language learning. This mixed-methods study investigates English teachers’ perceptions and readiness toward AI integration in junior high schools in Ogan Ilir, South Sumatra, Indonesia, an under-resourced and largely rural context that remains underrepresented in global AI-in-education research. Guided by the Technological Pedagogical Content Knowledge (TPACK) framework and technology acceptan...
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Islamic Education Learning Motivation: How the STAD Cooperative Model Impacts Students
International Journal of Research in Education
Vol 6
, No 1
(2026)
This study aims to analyze the effect of the Student Teams Achievement Division (STAD) cooperative learning model on students’ learning motivation in Islamic Religious Education (Pendidikan Agama Islam/PAI) at SMA Muhammadiyah 2 Bandar Lampung. The research employed a quantitative approach using a quasi-experimental design involving two groups: an experimental class implementing the STAD model and a control class receiving conventional instruction. The research instrument was a PAI learning moti...
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Stratification and Charging Efficiency in Compact Thermal Storage Under Variable Flow Conditions: An AI-Assisted Simulation Study
Simanjuntak, Janter P.
; Daryanto, Eka
; Tambunan, Bisrul Hapis
; Silaban, Robert
; Sinaga, Denny Haryanto
; Zainon, Mohd Zamri
; Muhammad Ibrahim
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2026)
Thermal Energy Storage (TES) systems are essential for managing low-grade heat in renewable energy applications. This study evaluates the impact of flow rate and heating power on thermal stratification and efficiency within a 30-liter TES unit. Using an AI-assisted simulation framework, the system's performance was analyzed across varying flow rates (0.3–0.9 LPM) and heater capacities (1.5–2.0 kW). Results indicate that lower flow rates (0.3–1.2 LPM) effectively preserve stratification, whereas...
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