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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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Analisis Pegaruh Kebijakan Pajak, Norma Subjektif dan Kinerja Keuangan terhadap Kepatuhan Pajak UMKM di Kota Semarang
KOMPAK : Jurnal Ilmiah Komputerisasi Akuntansi
Vol 19
, No 1
(2026)
Taxes play a vital role as the primary source of state revenue and a key instrument for financing national development through the State Budget (APBN). This study aims to analyze the determinants of tax compliance among Micro, Small, and Medium Enterprise (MSME) taxpayers in Semarang City, with a particular focus on the effects of tax policy, subjective norms, and financial performance. A quantitative associative approach was employed, using primary data collected through questionnaires distribu...
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Strategi Pengelolaan Arus Kas Untuk Keberlanjutan Usaha Kue Tradisional
KOMPAK : Jurnal Ilmiah Komputerisasi Akuntansi
Vol 19
, No 1
(2026)
Penelitian ini bertujuan untuk menganalisis strategi pengelolaan arus kas dalam mendukung keberlanjutan usaha kue tradisional dengan mengambil studi kasus pada Toko Roti Ganjel Rel Ambarawa. Pengelolaan arus kas yang efektif merupakan faktor krusial dalam menjaga keberlangsungan usaha kecil dan menengah, khususnya pada industri makanan tradisional yang menghadapi tantangan fluktuasi permintaan musiman dan persaingan dengan produk modern. Metode penelitian yang digunakan adalah kualitatif deskrip...
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Integrating Genre Based Approach with Canva to Improve Twelfth Grade Students' Reading Comprehension
International Journal of Research in Education
Vol 6
, No 1
(2026)
This study investigates the effectiveness of the Genre-Based Approach (GBA) integrated with Canva in enhancing students’ reading comprehension. Despite the growing emphasis on reading skills in English language learning, many students still struggle to understand text structures, identify key ideas, and recognize specific vocabulary. This gap highlights the need for innovative approaches that combine structured pedagogy with digital media. The objective of this study was to determine whether the...
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Roblox as Media for Students’ Language Output in Daily Conversation
International Journal of Research in Education
Vol 6
, No 1
(2026)
This study investigates the use of Roblox as a medium to enhance students’ language output in daily conversation classes. The research was conducted at BBC Semarang with six students from the Dynamic Conversation class who had no prior experience using Roblox. Employing a mixed-methods design, the study combined quantitative assessment of speaking performance—covering content, pronunciation, vocabulary, and grammar—with qualitative insights from classroom observations, questionnaires, and interv...
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