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Menampilkan 31–40 dari 10901 artikel
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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Numerical Modeling of Stress Ratios in Single-Lap Adhesive Joints with Geometrical Modifications
Kurnia, Asep
; Setya Putra, Ichsan
; Syamsudin, Hendri
; Giri Suada, Muhamad
; Demas Priambudi, Oktavianus
This study aims to analyze the effect of variations in aluminum strip geometry and Araldite adhesive on the mechanical strength of single lap joints. A two-dimensional numerical model was developed in Abaqus/Standard using cohesive zone elements, the Benzeggagh-Kenane (B-K) model, and a quadratic stress criterion to validate the experimental results. The results show that the developed model is capable of accurately describing the stress distribution and the effect of secondary bending moments t...
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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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Design and Development of SIPADMA: A Software Engineering Approach for Water Consumption Anomaly Detection in Public Water Utilities
Water utilities continuously face challenges in identifying abnormal customer water consumption caused by pipe leakage, illegal connections, meter reading errors, and unusual consumption behavior. Conventional manual inspection requires considerable time and often delays corrective actions. This study presents the design and development of SIPADMA (Sistem Deteksi Anomali Pemakaian Air), a web-based information system developed using Software Engineering principles to automate anomaly detection a...
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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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Analysis of Factors Related to Safety Riding in Employees of the Karangmalang Health Center in Semarang City in 2025.
Journal of Occupational Health, Hygiene and Safety
Vol 4
, No 1
(2026)
Traffic accidents are still a public health problem, especially for motorcycle users in the productive age group. This study aims to analyze factors related to safety riding behavior in employees of the Karangmalang Health Center in Semarang City. This study is a quantitative analysis with a cross-sectional design on 45 respondents who were taken in total sampling. Independent variables include age, working period, use of PPE, road environmental conditions, and family support, while...
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Analysis Of The Relationship Between Vendors’ Characteristics, Knowledge, And Attitudes Towards Preparedness For Fire Hazards In Karangayu Market Semarang
Journal of Occupational Health, Hygiene and Safety
Vol 4
, No 1
(2026)
Markets as public facilities with high activity have potential fire hazard risks due to electrical installations, flammable materials, and building and visitor density. This study aims to analyze the relationship between characteristics, knowledge, and attitudes with the preparedness of traditional market traders to potential fire hazard risks. This study was conducted from October 2025 to February 2026 using an observational analytical design with a cross-sectional approach on 95 Karangayu mark...
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The The Relationship Between Workload, Work Stress, Work Environment, and Management Role on Firefighter Performance
Journal of Occupational Health, Hygiene and Safety
Vol 4
, No 1
(2026)
Employee performance is an important factor in determining the success of an organization in achieving its established goals. At the Semarang City Fire Department, employees are required to work quickly, accurately, and responsively in emergency situations, making optimal performance essential. However, high job demands, psychological pressure, work environment conditions, and organizational culture that have not been fully optimized may affect employee performance. In addition, firefighting is...
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