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Prediction of Soil Nutrients from Different Soil Textures using Portable Spectrometer and Machine Learning
Himawan, Harki
; Nainggolan, Rut Juniar
; Rakhmadi, Handono
; Djoyowasito, Gunomo
; Ubaidillah
; Nopriani, Lenny Sri
; Al Riza, Dimas Firmanda
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2025)
Soil nutrients, such as nitrogen, phosphorus, and potassium, are critical for plant growth and agricultural productivity. Conventional laboratory methods for measuring these nutrients are accurate but often time-consuming, costly, and environmentally taxing. This study explores the potential of portable visible-near infrared (Vis-NIR) spectrometer combined with machine learning algorithms as a rapid, cost-effective, and eco-friendly alternative for soil nutrient analysis. Soil samples of clay, c...
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Influence of Mixing Time on the Hardness and Structure of Local Clay-Based Crucibles
Rusiyanto
; Rifky Ismail
; Athanasius Priharyoto Bayuseno
; Daffa Agya Mahardika
; Fitriyana, Deni Fajar
; Wirawan Sumbodo
; Aldias Bahatmaka
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2025)
Although clay crucibles are frequently utilized in regional industries, their inadequate mechanical strength often causes durability issues. This study investigates the influence of mixing duration on the Vickers hardness and macrostructure of crucibles composed of local clay, kaolin, and molasses. The composition was made up of 47.5% clay, 47.5% kaolin, and 5% molasses as a binder, with 15% water added relative to the total weight. Durations of 15, 30, and 45 minutes were evaluated to determine...
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Uncertainty-Quantified Grid-Convergence Analysis of RANS Turbulence Models for 2-D Incompressible Backward-Facing Step Flow in OpenFOAM
Kaiway, Mickael Ruben
; Joni
; Giai, Agustinus
; Siregar, Samuel Parlindungan
; Tambing, Enos
; Pius, Obia
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2025)
A concise evaluation of Reynolds-Averaged Navier–Stokes (RANS) turbulence modeling for two-dimensional, incompressible, steady backward-facing step (BFS) flow at Re = 1000–3000 was conducted using OpenFOAM’s SimpleFoam solver with the standard k–ε model. A tri-level mesh enhancement (coarse, medium and fine) was implemented, and ambiguity was measured utilizing the Convergence Ratio (CR) and Grid Convergence Index (GCI). The fine grid (CR = 0.54; GCI = 0.0059%) was the only configuration exhibit...
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Engineering Assessment of Earthquake Resistant Building Code Based on Seismic Load Responses
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2025)
Earthquake-resistant building design is fundamentally aimed at safeguarding life safety while controlling structural damage and preserving post-earthquake functionality under uncertain seismic actions. Although contemporary seismic codes provide detailed procedures for estimating earthquake-induced loads, differences in seismic hazard representation, force distribution rules, and deformation assumptions can lead to considerable variation in predicted structural response. This study presents a co...
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ANN-Based Mechanical Property Prediction of Bio-Fibre for Wind Turbine Blade Materials with FEM Validation
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2025)
The increasing demand for renewable energy highlights the need for sustainable materials in wind turbine blade design. Conventional fiberglass blades, while effective, present environmental and disposal challenges, motivating the exploration of bio-composites as greener alternatives. This study aims to develop and validate an integrated framework that combines experimental validation, Finite Element Method (FEM) pre-screening, Artificial Neural Networks (ANN), and Rule of Mixtures (RoM) validati...
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The Moderating Role of Digital Culture in the Relationship between Physical Ergonomics and Organizational Culture in SMI
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2025)
This study investigates the moderating role of digital culture in the relationship between physical ergonomics, organizational culture, and the performance of Small and Medium Industries (SMI). Using survey data from 123 manufacturing SME employees in Tegal, Indonesia, the analysis employed Structural Equation Modeling (SEM-AMOS). The findings reveal that digital culture significantly moderates the relationship between physical ergonomics and organizational culture (β = 0.083; CR = 12.126; p <...
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Performance of Self-Compacting Concrete Mixed and Cured with Magnetized Water
Alshirah, Majed
; Zahid, Mohd Zulham Affandi Bin Mohd
; Abu Bakar, Badorul Hisham Bin
; Jaafar, Zul Fahmi Bin Mohamed
Advance Sustainable Science, Engineering and Technology
Vol 8
, No 1
(2025)
This study investigates the effect of magnetized water (MW) on the mechanical and microstructural properties of self-compacting concrete (SCC). Four mixes with identical proportions were prepared to isolate the influence of MW at different stages: SCNTN (normal water used in both mixing and curing), SCNTM (normal water in mixing and MW in curing), SCMTN (MW in mixing and normal water in curing), and SCMTM (MW used in both mixing and curing). Compressive strength tests were conducted at 7 and 28...
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Peningkatan Kemampuan Public Speaking bagi Guru dan Siswa SMK Muhammadiyah Watukelir dengan Metode Bermain Peran
Educate: Journal of Community Service in Education
Vol 5
, No 2
(2025)
Kegiatan ini bertujuan untuk meningkatkan keterampilan berbicara guru dan siswa di SMK Muhammadiyah Watukeril melalui teknik role-playing. Keterampilan berbicara di depan umum sangat penting dalam pendidikan, karena membantu menyampaikan ide dan informasi dengan percaya diri. Metode role-playing dipilih karena menciptakan suasana pembelajaran yang interaktif dan menyenangkan.
Dalam kegiatan ini, siswa dan guru berlatih berbicara di depan umum melalui simulasi berbagai situasi, seperti presentasi...
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Pengaruh Substitusi Puree Kulit Pisang Kepok dan Jenis Lemak terhadap Sifat Organoleptik Kue Pukis
Sinar Dunia: Jurnal Riset Sosial Humaniora dan Ilmu Pendidikan
Vol 4
, No 4
(2025)
Kue pukis is a traditional wet cake originating from Banyumas Regency, Central Java Province. Pukis have a soft texture and sweet flavor. This study aims to determine: 1) The effect of kepok banana peel puree substitution on the organoleptic properties (color, aroma, taste and texture) of pukis; 2) The effect of fat type on organoleptic properties (color, aroma, taste and texture) of pukis; 3) The interaction effect of kepok banana peel puree substitution and fat type on organoleptic properties...
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Pengujian Black-Box Dengan Teknik State Transition pada Sistem Appoinment Klinik Berbasis Web Citra Medica
JURNAL ILMIAH KOMPUTER GRAFIS
Vol 18
, No 2
(2025)
Pengujian perangkat lunak merupakan tahap penting dalam memastikan kualitas dan keandalan sistem sebelum digunakan secara luas. Salah satu metode yang umum digunakan adalah black box testing, yaitu pengujian yang berfokus pada fungsionalitas perangkat lunak tanpa memperhatikan struktur internal kode. Dalam penelitian ini, metode black box testing diterapkan dengan menggunakan teknik state transition untuk menguji sistem appointment klinik berbasis web “Citra Medica”. Pengujian dilakukan dengan m...
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