Pusat Pengajian Sains Fizik - Tesis
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- PublicationMenyusun Pengesan Sinar Gamma Yang Mempunyai Sambutan Berkadaran(1982-12)Achmad, AmirDitunjukkan di dalam tesis ini bahawa satu sistem pengesan foton, yang terdiri dari satu pembilang sintilasi biasa, kristal NaI(Tℓ), yang dihadapannya diletakkan beberapa turas dari bahan-bahan yang sesuai, kecekapannya dapat dibuat berubah dengan tenaga foton datang parapaksi, menurut sifat yang ditentukan terlebih dahulu. Perkara ini dapat diperolehi dengan menyusun suatu formulasi di mana dengan formulasi itu memungkinkan kita dapat menyepadankan kecekapan Ei. bagi sistem pembilang untuk foton-foton bertenaga Ei dengan kecekapan yang diinginkan yang ditentukan oleh satu fungsi sambutan R(Ei). Beberapa pembolehubah yang digunakan di dalam pemadanan tersebut ialah sifat alam dan tebal bahan turas berserta dengan sebahagian lamanya masa turas itu berada di dalam bim foton yang sedang kita kaji. Berdasarkan penentuan kuasadua terkecil dapatlah dicari nilai-nilai optimum parameter di atas.
- PublicationDosimetric Investigation On The Dental Cone Beam Computed Tomography (Cbct) As An Imaging Modality For Paediatric Cleft Lip And Palate(2024-03)Ashour, Nabeel IbrahimThis study focuses on using dental cone beam computed tomography (CBCT) as an imaging modality for paediatric CLP patients, aiming to assess its safety and feasibility through a comprehensive dosimetric inquiry. To achieve this objective, detailed tissueequivalent (TE) head and neck phantoms representing newborn and 5-year-olds were created using advanced manufacturing techniques, particularly 3D printing.
- PublicationApplication Of Photodynamic Therapy With Magnetic Fields And Dyes For The Treatment Of Microbial Skin Infections In Vitro And In Vivo(2024-03)Al-Dalawi, Ali Adil TurkiThis study aims to explore the multifaceted approach that these qualities provide to the mechanism of action of aPDT in both in vitro and in vivo settings. Initially, the study focuses on determining the depths of penetration and transmission of laser light at various wavelengths across diverse tissues in vitro.
- PublicationLow-Cost Surface Passivation For Black Silicon Solar Cells By Liquid Phase Deposition Techniques(2023-12)Ahmad, Sheriff MuhiddinBlack silicon (b-Si) is a promising surface structure for solar cells due to its low broadband reflectance and superior light trapping properties within the 300–1100 nm wavelength region. For the fabrication of b-Si, one-step electroless metal-assisted chemical etching (MACE) is employed which produces nanowires (NWs) with heights of about 0.4 – 0.8 μm that result in low broadband reflectance but leads to high surface recombination in b-Si solar cells. To address this issue, efficient surface passivation is inevitable, which is essential for developing high-efficiency b-Si solar cells. Surface passivation by the formation of thermal silicon dioxide (SiO2) is the conventional method that involves high-temperature processing. The high process temperatures could deteriorate the nanotextured b-Si formed by the etching process, compromising broadband light absorption in the solar cells. Therefore, liquid phase deposition (LPD) is a promising alternative surface passivation technique that can reduce the surface recombination issue.
- PublicationMolecular Dynamics Simulation Of Nano Wetting Of Lennard-Jones Droplet On Curved Surfaces(2023-12)Alhiassah, Saleh Irsheid SalehThis thesis aims to investigate the wetting behavior of LJ nanodroplets on curved surfaces using molecular dynamics (MD) simulations implemented in the Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) package. The proposed methodology does not suffer the technical issues that plague experimental approaches. The thesis focuses on the influence of curved surface geometry and varying LJ interaction potentials on wetting transitions.