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All Journal Bulletin of Electrical Engineering and Informatics ASEAN Journal for Science and Engineering in Materials
Saris, Nur Najahatul Huda
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Performance of europium aluminium doped polymer optical waveguide amplifier Saris, Nur Najahatul Huda; Hamzah, Azura; Ambran, Sumiaty; Mikami, Osamu; Ishigure, Takaki
Bulletin of Electrical Engineering and Informatics Vol 8, No 4: December 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (808.925 KB) | DOI: 10.11591/eei.v8i4.1598

Abstract

In this paper, the graded index (GI) multimode rare-earth metal (RE-M) doped polymer optical waveguide amplifier has been prepared and tested optically. A 10-cm Europium Aluminum Benzyl Methacrylate ( was fabricated via a unique technique known as the “Mosquito Method” which utilizes a micro-dispenser machine. Optical gain from 75 to 150 µm circular core diameter waveguide of 13 wt.% concentration has been demonstrated and measured under forward pumping condition. The cladding monomer deployed in this research is Acrylate resin XCL01, which is a modified photocurable acrylate material. Fundamentally, -30 decibel (dBm) red light signal input and 23 dBm pump power of 532 nm green laser wavelength is implemented within the range of 580 to 640 nm optical amplification wavelength. A maximum gain of 12.96 dB at 617 nm wavelength has been obtained for a 100 µm core diameter of Eu-Al polymer optical waveguide. The effect of different coupler diameter for pumping and the comparison of insertion loss before and after amplification against the performance of the Eu-Al polymer waveguide amplifier are also studied. There exists an optimum core diameter of which the amplifier gain enhancement is at maximum value.
Experimental and Bibliometric Analysis of Truncated Cone Fouling Suppression Device for Vortex-Induced Vibration Control in Marine Structures Sukarnoor, Noor Idora Mohd; Nik, Wan Mohd Norsani Wan; Hussain, Ahmad; Quen, Lee Kee; Saris, Nur Najahatul Huda; Jusoh, Suriani Mat; Zulkifli, Fakhratul Ridwan
ASEAN Journal for Science and Engineering in Materials Vol 5, No 2 (2026): AJSEM: Volume 5, Issue 2, September 2026
Publisher : Bumi Publikasi Nusantara

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Abstract

Vortex-induced vibration (VIV) poses a critical threat to the integrity and fatigue life of marine and offshore structures. This study evaluates the effectiveness of a truncated cone fouling suppression device in reducing VIV of a low-mass ratio circular cylinder. Experiments were performed in a circulating water flume at Reynolds numbers ranging from 8,000 to 45,000, using various surface coverage ratios. The vibration amplitude and frequency responses were analyzed to determine suppression performance. Results showed that the device reduced oscillation amplitude by up to 68% within the lock-in region, with optimal suppression observed at 25-50% coverage. This indicates that partial surface modification enhances flow–structure interaction and weakens wake coherence. Furthermore, a bibliometric analysis was integrated to identify research trends and gaps in passive vibration control. The present approach provides both scientific and practical insights for developing low-drag, efficient, and sustainable VIV mitigation strategies in marine engineering.
Co-Authors Ambran, Sumiaty Hamzah, Azura Hussain, Ahmad Ishigure, Takaki Jusoh, Suriani Mat Mikami, Osamu Nik, Wan Mohd Norsani Wan Quen, Lee Kee Sukarnoor, Noor Idora Mohd Zulkifli, Fakhratul Ridwan