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Menampilkan 1–10 dari 851 artikel
Microwave-Assisted Self-Healing of AC-WC Modified with Iron Powder: Mechanical Performance and Healing Rate
Amalia Firdaus Mawardi
; Machsus Machsus
; Dadang Supriyatno
; Achmad Faiz Hadi Prajitno
; Muhammad Fikri Nadhif
; Hazen Masrafat
Conventional asphalt mixtures have limited microwave absorption, reducing the effectiveness of microwave-assisted self-healing. This study evaluates the effect of iron powder (0–10% by mass of fine aggregate) as additional fine aggregate in AC-WC mixtures on mechanical performance and microwave-activated healing behavior. Cylindrical specimens (63 mm × 100 mm; three per mixture) were tested using Marshall Stability and Indirect Tensile Strength (ITS) at 25 °C. Healing efficiency was determined b...
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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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Pengaruh Jam Belajar dan Kehadiran terhadap Nilai Ujian Siswa Menggunakan Logistic Regression dan Decision Tree
Journal of Informatics Education
Vol 9
, No 1
(2026)
Perkembangan teknologi data memberikan peluang dalam menganalisis faktor-faktor yang memengaruhi performa akademik siswa secara lebih objektif dan berbasis data. Penelitian ini bertujuan untuk menganalisis pengaruh jam belajar dan tingkat kehadiran terhadap nilai ujian siswa di SMP Negeri 3 Sokaraja menggunakan pendekatan pembelajaran mesin terawasi, yaitu algoritma Logistic Regression dan Decision Tree. Dataset yang digunakan terdiri dari data siswa yang mencakup variabel Study_Hours, Attendanc...
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Exploring Serum Bilirubin as a Potential Biomarker for Primary Open-Angle Glaucoma
Total bilirubin (TBIL) functions as a natural antioxidant, and its levels tend to decrease with increasing oxidative stress, including in glaucoma tissue. This study aims to explore the relationship between total serum bilirubin levels and the severity of primary open-angle glaucoma (POAG). A total of 25 POAG patients and 25 control subjects further divided into aged >60 years and ≤60 years from the Glaucoma Clinic of the Universitas Sumatera Utara Hospital and its affiliated hospitals were i...
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Pengaruh Edukasi Ibu Hamil terhadap Pencegahan Stunting di Desa Yamansari, Kabupaten Tegal
Stunting adalah masalah gizi kronis yang menjadi tantangan besar dalam bidang kesehatan masyarakat, terutama di wilayah dengan prevalensi tinggi seperti Kabupaten Tegal. Penelitian ini bertujuan untuk menganalisis pengaruh edukasi terhadap pengetahuan dan perilaku ibu hamil dalam mencegah stunting di Desa Yamansari. Penelitian ini menggunakan metode kuantitatif dengan pendekatan deskriptif dan analisis regresi. Hasil penelitian menunjukkan bahwa edukasi memiliki pengaruh positif terhadap peningk...
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STUDI LITERATUR : METODE PELATIHAN MANAJEMEN KESELAMATAN PROSES BAGI MANAJER, PENGAWAS DAN PEKERJA LAPANGAN DI PERUSAHAAN KILANG MINYAK BUMI
Masjuli, Masjuli
; Marhaendra, Andhika Dwi
; Handayani, Hanifah
; Ramli, Azizan
; Rosmalia, Rosmalia
Perusahaan kilang minyak bumi mempunyai potensi bahaya terjadinya kebakaran, peledakan, pencemaran lingkungan yang dapat menyebabkan korban jiwa manusia baik dari pekerja, maupun masyarakat, harta benda perusahaan, masyarakat dan kerusakan lingkungan. Oleh karena itu, untuk meminimalkan risiko, maka semua pekerja baik jenjang manajer, pengawas (supervisor), maupun pekerja lapangan (frontliner) perlu mendapatkan pelatihan untuk memahami manajemen keselamatan proses (Process Safety Management – PS...
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Performance Optimization of a Petrochemical Cooling Tower via Fill Replacement: Cleanflow vs Cleanflow Plus
This study investigates the performance improvement of an induced draft, counterflow cooling tower after replacing the existing Cleanflow fill with Cleanflow Plus. One cell (E) was upgraded while four cells (A–D) served as the baseline under CTI ATC-105 procedures. Measurements included outlet temperature, wet-bulb temperature, circulation flow, and fan power. Results show that Cell E achieved a higher cooling range (9.20°C vs. 8.63°C average) and a lower approach (6.29°C vs. 6.87°C average). He...
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Performance Evaluation of a Community-Scale Fiberglass Anaerobic Digester for Biogas and Nutrient Recovery
The management of organic waste using an anaerobic reactor offers the potential for renewable energy production and nutrient recovery. This study evaluates the performance of a 3,000 L fiberglass anaerobic reactor designed to treat a mixture of kitchen waste, cow manure, and water in a 1:1:1 ratio. The process was conducted under mesophilic conditions (30–38 °C) over a 40-day batch cycle. The reactor produced a total of 63.75 m³ of biogas with an average methane content of 59.3%, equivalent to 0...
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Design and Implementation of a Web-Based QR Code Employee Attendance System for Optimizing Attendance Management: A Case Study at Bento and Es Teh Luwes Ungaran
Nufninu, Novinda Grezen
; Rudjiono, Rudjiono
; Panjaitan, Cherlina Helena Purnamasari
; Nufninu, Novinda Grezen
; Rudjiono, Rudjiono
; Panjaitan, Cherlina Helena Purnamasari
Penelitian ini dilatarbelakangi oleh proses absensi karyawan pada Stand Bento dan Stand Es Teh Luwes Ungaran yang masih dilakukan secara manual menggunakan buku absensi. Kondisi tersebut menimbulkan beberapa kendala, seperti kesalahan pencatatan jam masuk dan pulang, risiko kehilangan atau kerusakan data, serta lambatnya proses rekapitulasi laporan kehadiran. Penelitian ini bertujuan untuk merancang dan mengimplementasikan sistem absensi karyawan berbasis web menggunakan teknologi QR Code guna m...
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