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All Journal JURNAL GALUNG TROPIKA Meteor STIP Marunda Indonesian Journal of Pharmaceutical and Clinical Research Dinamika Bahari: Journal of Maritime Dynamic IJGIE (International Journal of Graduate of Islamic Education) Indonesian Journal of Applied Research (IJAR) Dirgamaya: Jurnal Manajemen dan Sistem Informasi International Journal of Science and Environment Indonesian Journal of Community Empowerment (IJCE) MULTIPLE: Journal of Global and Multidisciplinary Aslamiah: Jurnal Pendidikan, Ekonomi, Sosial dan Budaya AL-KARIM: Journal of Islamic and Educational Research Jurnal Kesehatan Republik Indonesia BA: Jurnal Pengabdian kepada Masyarakat Journal of Education and Science (EDUSAINS) Ar-Rasyid: Jurnal Publikasi Penelitian Ilmiah
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Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Dentistry Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Veterinary Other

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The Effect of Injector Performance on Exhaust Gas Temperature Diesel Generator Engine on Ship Fikri Supriatmana, Muhamad; Nasri; Marlia Sandi, Wulan; Retno Gunarti, Monika; Sianturi, Intan
International Journal of Science and Environment (IJSE) Vol. 6 No. 1 (2026): February 2026
Publisher : CV. Inara in Colaboration with www.stie-sampit.ac.id

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v6i1.444

Abstract

Injectors play a crucial role in optimal combustion of marine diesel generator engines, but their performance degradation often causes exhaust gas temperature fluctuations that reduce efficiency and operational reliability. This study aims to analyze the effect of injector performance on exhaust gas temperature on the SV. STELLA 28 vessel. Using a causal descriptive quantitative approach, the population is operational data of Auxiliary Engine 1 and 2 for 12 months, with a purposive sample of 70 observations. Instruments include injector maximum pressure (PMAX) measurements and exhaust gas temperature thermocouples, analyzed through the Kolmogorov-Smirnov normality test, simple linear regression, and SPSS. The results show a significant effect (Sig. 0.000) with R² 0.417 and the equation . The conclusion states that optimal injector performance stabilizes exhaust gas temperature, supporting condition-based maintenance.
The Effect of High Temperature (HT) Freshwater Cooling Pump Pressure on Main Engine Jacket Water Temperature on The MT. Sunrise Warrior Ship Ni Putu Nofita Yanti Dewi; Nasri; Sigit Purwanto; Antonius Edy Kristiyono; Novitasari Novitasari
International Journal of Science and Environment (IJSE) Vol. 6 No. 2 (2026): May 2026
Publisher : CV. Inara in Colaboration with www.stie-sampit.ac.id

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v6i2.471

Abstract

This study analyzes the effect of high temperature (HT) freshwater cooling pump pressure on the main engine jacket water temperature on the MT. Sunrise Warrior tanker, addressing operational reliability issues due to a decrease in pressure from 2.5-3.5 bar to 1.8 bar which causes overheating above 85°C. Using a quantitative approach with simple linear regression on 30 purposive samples from the engine room logbook (July 2024-July 2025), instruments including pressure gauge (X: 2.1-3.3 bar) and temperature indicator (Y: 70-90°C), analyzed through SPSS with the classical assumption test, t-test, F-test, and R². The results show a strong negative correlation (R=0.996) with the equation Y=124.931-16.650X which explains 99.1% of the variation (R²=0.991), all tests are significant (t=-56.527, F=3195.333, p<0.001). Increasing pump pressure significantly reduces jacket water temperature, resulting in a validated prediction model different from previous qualitative studies, with implications for preventive maintenance in maritime engineering.
Docking-Based Evaluation of LC–HRMS Metabolites from Fermented Mustard Greens on DNA Gyrase B and Xanthine Oxidase Nasri; Cintya, Henni; Silalahi, Jansen; Haro, Ginda; Suci, Nurul; Kaban, Vera Estefania
Indonesian Journal of Applied Research (IJAR) Vol. 7 No. 1 (2026): Indonesian Journal of Applied Research (IJAR)
Publisher : Universitas Djuanda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30997/ijar.v7i1.866

Abstract

Fermented mustard greens (Brassica juncea L. Czern.) contain bioactive metabolites formed through lactic acid bacteria–driven biotransformation, yet their molecular targets related to antibacterial and antioxidant functions remain poorly understood. This study aimed to characterize key metabolites in fermented mustard greens and evaluated their potential inhibitory activity against DNA gyrase B and Xanthine Oxidase through an integrated LC–HRMS metabolomics and molecular docking approach. Untargeted LC–HRMS profiling identified 292 metabolite features, from which five compounds—gentisic acid, trans-cinnamic acid, xanthurenic acid, indole-3-lactic acid, and indole-3-acrylic acid—were structurally confirmed via MS/MS fragmentation. These metabolites were docked against DNA gyrase B (5D7R) and Xanthine Oxidase (3NVW) to predict binding affinity and interaction mechanisms. Xanthurenic acid exhibited the strongest interaction with DNA gyrase B (–7.6 kcal/mol), forming hydrogen bonds with key catalytic residues, such as Asp81 and Ile86, which suggested ATP-competitive inhibition. Meanwhile, gentisic acid and indole-3-acrylic acid exhibited the most favorable binding to Xanthine Oxidase (–7.2 kcal/mol), characterized by π–π stacking with Phe914 and Phe1009 and hydrogen bonding to Glu802, indicating dual antioxidant and anti-hyperuricemic potential. These findings highlighted fermented mustard greens as a promising functional food source containing metabolites with predicted antibacterial and XO-inhibitory activities. Further in vitro and in vivo validation is required to confirm these computational insights.
Co-Authors Akzad, Muhammad Bima Ali Imran Ritonga Annuru Ulaiya Antonius Edy Kristiyono Ardiansyah, Andri Arif Hidayat Arnela Nur Aslamiyah B.K, Felicia A. Stevanie` casmono, isma kurnia Cintya, Henni Cut Ratna Keumala Deni Irwansyah Desi Almunadia Dharmawan, Hariyadi Edgar Pratama Fida Rahmani Fikri Supriatmana, Muhamad Fiore Elang Arsyandi Fitri, Raissa Hamzah, Andi Siady Haro, Ginda Herdinata, Guntur Ratih Prestifa Jansen Silalahi Jufri, Sri Wahyuni Julia Reveny Lalu Muh. Fahri Larekeng, Siti Halima Linda Suryani lntan Liana Marlia Sandi, Wulan Muhammad Abduh Muhammad Yahyadin Munajat Nursaputra, Munajat Ni Putu Nofita Yanti Dewi Nilawati, Ika Novitasari Novitasari Nur Amin Nurdin Putri Rahmatul Yulia RAHMAT GUNAWAN ratna willis Retno Gunarti, Monika Rina Dewiana Roni Azmal Rusidah Sianturi, Intan Sibarani, Mauritz H. M Sibarani Sigit Purwanto Simanjuntak, Marihot Suci, Nurul Urip Harahap Vera Estefania Kaban Wijaya, Indra Yunitasari Zubaili