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1001
Optical properties of ultrathin metal oxide and metal films : effect of free electrons, quantum confinement and localized surface plasmon resonance
Published 2016“…Ultrathin Au films were deposited using electron beam evaporation technique. Optical properties including dielectric function, optical constant and band gap energy of the thin films were investigated with spectroscopic ellipsometry (SE) based on various optical dispersion models. …”
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Thesis -
1002
Investigation of soil-structure interaction for deep excavations
Published 2023“…The deep excavation was supported by a complex ’combi-wall’ cofferdam, a reinforced concrete (RC) capping beam, and two levels of internal bracing, and its performance was assessed through measured wall deflections, bracing member loads, and site and bunker water levels. …”
Thesis -
1003
Evaluation and selection of rice mutants for high yield and quality fodder production
Published 2014“…The results from this study indicated that ion beam radiation caused significant changes in the agronomic performance of majority of the mutant lines compared with the parental variety (MR219), based on genetic diversity results and agronomic traits performance. …”
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Thesis -
1004
Programmable interfacial band configuration in WS2/Bi2O2Se heterojunctions
Published 2024“…Using this material combination, we further design a sophisticated band architecture incorporating both type-I (WS2 straddles Bi2O2Se, fluorescence-quenched) and type-I (Bi2SeO5 straddles WS2, fluorescence-recovered) alignments in one sample through focused laser beam (FLB). By programming the FLB trajectory, we achieve a predesigned localized fluorescence micropattern on WS2 without changing its intrinsic atomic structure. …”
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Journal Article -
1005
Computational design of a novel soft-Xray-based turbulence diagnostic in NSTX-U
Published 2024“…Assumptions from the previous study, such as infinitely thin beam size, are relaxed to assess their impact on reconstruction. …”
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Thesis -
1006
Investigation of solar cell carrier lifetime using photoconductance lifetime measurements
Published 2020“…For comparison, we have also studied electron beam deposited MoOx as a passivation layer. The evaluation of the quality of the passivation is done by measuring the effective lifetime of Si via the Sinton WCT-120 Photoconductance Lifetime tester. …”
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Final Year Project (FYP) -
1007
Constructing 3D self-supporting surfaces with isotropic stress using 4D minimal hypersurfaces of revolution
Published 2021“…The existing thrust network analysis methods discretize both geometry and material by approximating the continuous stress field through uniaxial singular stresses, making them an ideal tool for analysis and design of beam structures. In contrast, our method works on piecewise linear surfaces with continuous material. …”
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Journal Article -
1008
Effect of geometric scaling on the microstructural development of selective laser melted metal parts
Published 2022“…This study discusses the effect of geometric scaling, delay time (i.e., the time it takes for the laser beam to jump from one scan vector to the adjacent scan vector, which is controlled by the jump speed), gas flow, and defocusing distance on microstructural development and mechanical properties of selective laser melted 316L stainless steel. 316L stainless steel has been used in various industries such as aerospace and petrochemical industries due to its superior properties such as very good corrosion resistance. …”
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Final Year Project (FYP) -
1009
On shear adhesion of adhesive fibrils
Published 2024“…Our model reveals that, depending on the fibrillar aspect ratio, the adhesive fibril exhibits three distinct deformation regimes: thin film shearing, thick block shearing, and slender beam bending. The important parameters governing the shear adhesion of the lap shear system are the aspect ratio of fibrils, elastic moduli of the fibrils and substrates, while the Poisson's ratio of fibrils has no noticeable effect. …”
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Journal Article -
1010
Non-Destructive Material Characterization Methods /
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software, multimedia -
1011
Squeezing the Quantum Noise of LIGO below the Standard Quantum Limit
Published 2024“…The SQL applies when using uncorrelated photons or coherent light to measure the object, such as a laser beam. However, introducing quantum correlations through squeezed light, a technique called squeezing (Chapter 2), can circumvent this limit. …”
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Thesis -
1012
Growth of gallium nitride nanowires by low pressure chemical vapor deposition (LPCVD)
Published 2013“…Growth of III-Nitride nanowires on Si, which is the most commonly used substrate in microelectronic industry, using different growth techniques such as conventional Chemical Vapor Deposition (CVD), Metal Organic Chemical Vapor Deposition (MOCVD), and Molecular Beam Epitaxy (MBE) etc. have been explored. Low pressure chemical vapor deposition (LPCVD), which is widely used in Si wafer fabs, is of particular interest due to its low cost, ability to handle large size wafer and high throughput. …”
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Thesis -
1013
Ordered hybrid nanoneedle arrays for gas sensing
Published 2014“…In the present thesis, a novel ordered metal/silicon hybrid nanoneedle array is fabricated using an ion beam that patterns the metal/silicon substrate producing a pillar array followed by the self-organization of hybrid nanoneedles. …”
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Thesis -
1014
Surface plasmon resonance (SPR) enhanced biosensors
Published 2016“…The fabrication steps of the arrays were composed of electron-beam lithography and nano-imprint lithography. In comparison with the PAuNH array, the AuNH array offered higher field enhancement for fluorescence when only LSP was excited. …”
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Thesis -
1015
Two-dimensional transitional metal dichalcongenide heterostructures : interface optical properties
Published 2018“…In the hBN/TMDC/hBN heterostructure, e-beam induced e-h pairs can transfer to and be trapped in the middle TMDC layer, leading to increased recombination probability within the TMDC layer. …”
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Thesis -
1016
Novel heat treatment methodology for residual stress relieve of AlSi10Mg without compromise of mechanical strength
Published 2021“…Additive manufacturing (AM) has made the fabrication of complex parts possible which otherwise, would not have been possible with conventional subtractive manufacturing. Laser Beam Powder Bed (LBPB) Fusion, commonly known as Selective Laser Melting (SLM), is one of the methodologies in AM for metal fabrication. …”
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Thesis-Doctor of Philosophy -
1017
SPP/LSP coupled hybrid mode directed multi-functional surface-enhanced Raman system
Published 2013“…In the experiment, SPPs are excited by a tightly-focused radially polarized beam and interact with the nanospheres to generate the plasmon-hybrid-mode, exactly according to the second configuration aforementioned. …”
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Thesis -
1018
Hybrid lasers and modulator on silicon in the near- and mid-infrared region
Published 2017“…The lateral grating can be fabricated by CMOS-compatible inline lithography, which avoids the use of expensive and time-consuming electron beam lithography. The device works at room temperature with the single-side-suppression-ratio (SMSR) of 20 dB and the threshold current density is 1.54 kA/cm2. …”
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Thesis -
1019
Pulsed fiber laser at 1 μm wavelength region
Published 2017“…The optical-to-optical conversion efficiency of ~ 67% for the main amplifier and the 4σ beam quality (M2) of 1.7 is obtained. The limiting factors for high power YDPFLs (such as ASE, Stimulated Raman Scattering (SRS) and Stimulated Brillouin Scattering (SBS)) are cautiously studied and addressed. …”
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Thesis -
1020
Selected Problems of Solid Mechanics and Solving Methods /
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software, multimedia