Pusat Pengajian Sains Fizik - Tesis

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    Sedimentology, Depositional Environment, And Ancient Relative Sea-Level Fluctuations For Paleozoic Sedimentary Outcrops In Langkawi Island, Kedah, Malaysia
    (2025-07)
    Abdul Rahman, Aqillah
    This study investigates the sedimentology, depositional environments, and ancient sea-level fluctuations of Paleozoic sedimentary formations on Langkawi Island, Malaysia. Despite Langkawi’s significance as a Paleozoic outcrop locality, there remains a gap in understanding the detailed relationship between its facies, depositional environments, and ancient sea-level changes. Furthermore, although Fischer plots are valuable tools for illustrating relative sea-level changes, existing methods often lack accessibility and suitability for diverse datasets, particularly in field-based stratigraphic studies. Utilizing an integrated approach that combines fieldwork, petrographic analyses, Fischer plot modeling, and sequence stratigraphy, the research offers a comprehensive understanding of the sedimentary and tectonic history of the study area. The study aims to delineate relative sea-level changes and their relationship with depositional environments, offering insights into regional and global geological processes. Fifteen distinct facies and microfacies (F1-F15) were identified, reflecting depositional settings such as foreshore, shoreface, offshore, tidal flats, glaciomarine and carbonate ramps.
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    The Synthesis Of Activated Carbon And Graphene Oxide Derived From Empty Fruit Bunches Using Slow Pyrolysis As Potential Electrode Material For Supercapacitor Application
    (2025-07)
    Olufemi, Akinnawo Olumide
    This study investigates the impact of water-washing pretreatment on oil palm empty fruit bunches (EFB) for the synthesis of activated carbon (AC) and graphene oxide (GO) electrodes aimed at enhancing supercapacitor performance. The primary objectives are to evaluate how washing pretreatment influences the physicochemical properties of biochar and to compare the electrochemical performance of AC and GO electrodes derived from the same biomass source.
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    Impact Of Titanium Nitride Nanoparticles On Structure & Optical Properties Of Neodymium/Thulium Ions Co-Doped Tellurite Glass
    (2025-09)
    Abu Zaibidin, Nur Farah Asyiqa
    The small emission cross-section of rare earth ions (REIs)-doped tellurite glass limits its utilisation in optical fibre amplifiers and solid-state lasers. The study develops a novel glass composition by modifying concentrations of TiN NPs ranging from 0.1 to 0.5 mol% into tungsten-bismuth tellurite glasses co-doped with Nd3+ and Tm3+. Glasses are synthesised via the melt-quenching technique. Structural analyses revealed modifications in the glass network. XRD confirmed the glass’s amorphous nature with a broad hump at 20 – 40°, while a peak at 36° indicated the presence of TiN NPs at higher concentrations. HR-TEM revealed particle size and particle distribution, while Raman and FTIR spectra suggested network depolymerisation due to TiN NPs. Optical analyses (UV-Vis-NIR and PL) highlighted enhanced emission and absorption properties. Luminescence enhancement at Tm3+: 3F2→3H6 (648 nm) transition maximised at 0.2 mol% TiN NPs with 3.13-fold enhancement, driven by the localised surface plasmon resonance (LSPR) effect. Semi-empirical analyses using the Judd-Ofelt and McCumber theories validated the material’s potential for laser applications, demonstrating high emission cross-sections and gain coefficients. The results underscore the critical role of structural modifications in enhancing optical performance, positioning TiN NPs-modified tellurite glasses as promising candidates for solid-state lasers, optical fibre amplifiers, and near-infrared technologies.
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    Morphological, Structural And Optical Characteristics Of Zinc Oxide Grown By Chemical Bath Deposition Method
    (2025-09)
    Luo, Yexing
    This project is to investigate the morphological, structural and optical properties of Zinc oxide (ZnO) thin films grown on glass as the substrate by chemical bath deposition (CBD) method with different durations. In this work, hexamethylenetetramine (HMTA, C6H12N4) and zinc nitrate hexahydrate (Zn(NO3)2-6H2O) powder were mixed with 1:1 molar ratio and dissolved in deionized (DI) water to make the precursor solution required for the growth of ZnO. Prior to the CBD growth, a ZnO seed layer was first deposited by radio-frequency (RF) magnetron sputtering on all the glass substrates so that well-aligned ZnO could be obtained. This series of samples was obtained by varying the growth time, which was 0.5, 1, 2, and 4 h.
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    Quantitative Interpretation, Seismic Attributes, And Machine Learning Integration For Advanced Reservoir Characterization And Geomechanics In The Browse Basin, Australia
    (2025-08)
    Muhammad, Khan
    3D seismic data provide detailed subsurface insights essential for hydrocarbon exploration, production, geothermal development, and CO₂ storage assessment. Conventional seismic interpretation methods often underperform in structurally and depositional complex environments. This study presents a comprehensive, data-driven workflow integrating advanced seismic interpretation, machine learning, and geomechanical modeling to enhance reservoir characterization in the Poseidon 3D area, Browse Basin, Northwestern Australia. This study addresses key challenges such as mapping complex fault systems resulting from multiple tectonic events, identifying high-quality gas reservoirs within the fluvial–deltaic Jurassic Plover Formation, and delineating overpressure zones in the Jamieson Formation.