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Effect of Salt Bath and Oil Quenching Heat Treatments on SKT4 Forging Dies for Sustainable Undercarriage Link Production
Jatimurti, Wikan
; Muhadzdzib, Muhammad Zhafran
; Purniawan, Agung
; Sutarsis
; Wibisono, Alvian Toto
SKT4 steel, classified by the Japan Industrial Standard (JIS) as a hot-forming mold steel, is widely used for forging dies due to its favorable chemical composition and mechanical properties. During forging, dies are subjected to repeated impacts and high temperatures, which gradually reduce their performance and contribute to product defects. However, quantitative comparisons between salt bath and oil quenching treatments for SKT4 dies in high-cycle forging applications remain limited. This stu...
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Rekonstruksi Kurikulum Berbasis Outcome-Based Education (OBE) dalam Proses Pembelajaran: Studi Kasus di FKIP Universitas Ivet
Journal of Informatics Education
Vol 9
, No 1
(2026)
Pergeseran paradigma pendidikan tinggi menuntut LPTK mengadopsi kurikulum Outcome-Based Education (OBE) demi menjamin mutu lulusan yang relevan dengan abad ke-21. Namun transisi dari model konvensional sering kali menghadapi resistensi kultural dan hambatan struktural di lapangan. Penelitian ini bertujuan untuk menganalisis rekonstruksi dokumen kurikulum, dinamika transformasi proses pembelajaran dosen, dan sistem asesmen serta respons mahasiswa dalam implementasi OBE. Menggunakan pendekat...
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Behavior of Lightweight Aggregate Concrete with FRP Confinement: Experimental Insights for Structural Applications
Louk Fanggi, Butje Alfonsius
; Yuyun Tajunnisa
; Hazen Masrafat
; Jusuf Wilson Meynerd Rafael
; Alva Yuventus Lukas
; Niakku Immanuel Maggang
; Joko Suparmanto
; Melati Tabita Kirana Thei
Lightweight aggregate concrete reduces structural dead load but generally exhibits lower compressive strength and ductility than normal-weight concrete. This study experimentally evaluates the effectiveness of carbon-fibre-reinforced polymer (CFRP) confinement for low-density lightweight aggregate concrete, an area in which data for square sections remain limited. Twelve 300-mm-high specimens with a density of approximately 1550 kg/m³ were tested under monotonic concentric compression. The inves...
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Peran Kepala Sekolah Dalam Peningkatan Manajemen Pembelajaran Bagi Guru: Studi Kasus di SMP Islam Kluwan
Journal of Informatics Education
Vol 9
, No 1
(2026)
Penelitian tentang integrasi kelima peran kepemimpinan kepala sekolah secara simultan di sekolah swasta berbasis Islam yang mengimplementasikan Kurikulum Merdeka masih terbatas. Penelitian ini bertujuan mendeskripsikan peran kepala sekolah dalam peningkatan manajemen pembelajaran, pelaksanaan manajemen pembelajaran, serta faktor pendukung dan penghambatnya di SMP Islam Kluwan. Pendekatan kualitatif dengan rancangan studi kasus tunggal instrumental digunakan, dengan pengumpulan data melalui wawan...
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Pengaruh Teknologi Informasi, Budaya Sekolah, dan Kompetensi Guru terhadap Hasil Belajar
Journal of Informatics Education
Vol 9
, No 1
(2026)
Penelitian ini bertujuan untuk menganalisis pengaruh penggunaan teknologi informasi, budaya sekolah, dan kompetensi guru terhadap peningkatan hasil belajar siswa di SMP Negeri 1 Kedungjati. Latar belakang penelitian didasarkan pada kebutuhan sekolah untuk mengoptimalkan pembelajaran berbasis digital, memperkuat budaya akademik, dan meningkatkan kompetensi guru sebagai faktor pendukung mutu hasil belajar. Penelitian ini menggunakan pendekatan kuantitatif dengan desain ex post facto. Data yang dig...
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Freeze-Dried Phycocyanin Microcapsules: Effect of Maltodextrin-Soy Protein Ratios on Encapsulation Efficiency and Particle Properties
Natural pigments such as phycocyanin are highly sensitive to environmental conditions and therefore require stabilization to broaden their applications in functional products. This study aimed to evaluate the effect of varying ratios of maltodextrin and soy protein isolate (SPI) on the physical properties and encapsulation performance of freeze-dried phycocyanin microcapsules. Phycocyanin was extracted using phosphate buffer and encapsulated in three formulations with different maltodextrin–SPI...
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Prediction of Ground Vibration due to Blasting Activities of Coal Open Pit Mine Near Village Residents Using Multivariate Logarithmic Regression
Prasmoro, Alloysius Vendhi
; Siswanto, Nurhadi
; Santosa, Budi
; Nugraha, Giri Waluyo
; Salleh , Mohd Shukor
Blasting activities are among the most important in mining and can have a negative impact on the environment and surrounding communities, causing disruption and even damaging nearby buildings and infrastructure. If the community protests and demonstrates, mining operations may be shut down, which would be very detrimental to the company. Studies are needed on effective planning to reduce the negative impacts. Ground vibrations measured by Peak Particle Velocity (PPV) are subject to thresholds se...
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Factors Associated With Subjective Musculoskeletal Disorder (MSD) Complaints Among Fitness Instructors In Semarang City, 2025
Journal of Occupational Health, Hygiene and Safety
Vol 4
, No 1
(2026)
instructors due to repetitive movements, high physical load, and prolonged teaching duration. This study aimed to analyze factors associated with subjective MSD complaints among fitness instructors in Semarang City in 2025. A quantitative cross-sectional study was conducted with 110 instructors selected by accidental sampling. Data were collected using the Standardized Nordic Questionnaire (SNQ) and Rapid Entire Body Assessment (REBA). Bivariate analysis used Spearman Rank, Chi-square, and...
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The Effect of Nutritional Status and Workload Intensity on Fatigue and Productivity Levels Among Production Unit Workers at PT X in East Jakarta, DKI Jakarta
Journal of Occupational Health, Hygiene and Safety
Vol 4
, No 1
(2026)
Achieving health in the workplace is greatly influenced by how the workforce fulfills its nutritional requirements. Every worker needs nutrients according to the type of work they do. Heavy work requires consuming more calories compared to medium and light work, this is basically to achieve a balance between nutritional intake and workload. Fulfillment of nutrition that is not appropriate to the workload can cause a decrease in productivity and increase the potential for experiencing work fatigu...
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Scalable TOPSIS Variants in Web-Based Decision Support Systems: A Performance Benchmarking Study on Vectorization and Uncertainty Modelling
This study systematically benchmarks the computational performance and decision consistency of three TOPSIS variants—classical TOPSIS, vectorized TOPSIS, and Z-TOPSIS—in scalable web-based multi-criteria decision support systems (DSS). Although TOPSIS is widely used due to its simplicity and interpretability, its scalability and computational behavior under concurrent web workloads remain insufficiently explored. To address this gap, the algorithms were evaluated using datasets containing 50–500...
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