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2521
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 -
2522
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 -
2523
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 -
2524
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 -
2525
Self-learning shape recognition in medical images
Published 2019“…Accordingly, automatic biomedical image segmentation becomes a crucial pre-requisite in practice and has been a critical research issue over tens of years. However, major challenges exist in medical image segmentation such as the low intensity contrast to surrounding tissues and complex geometry of shape. …”
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Thesis -
2526
SINGAPORE STANDARD : Specification for clean and green urban farms – Agriculture Incorporating Amendment No. 1 /
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software, multimedia -
2527
Selected Problems of Solid Mechanics and Solving Methods /
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software, multimedia -
2528
Developments in THz Polaritonics: Towards Integrated Nonlinear THz Spectroscopy
Published 2024“…The optical pump light is focused onto the bevel, after which it refracts and becomes confined within the waveguide by total internal reflection. This allows the pump beam to repeatedly drive the generated THz field during its multiple back-and-forth traversals within the LN slab. …”
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Thesis -
2529
Developing metallic cathode for low-temperature solid oxide fuel cell applications
Published 2017“…To study the stability of metallic cathode, an interfacial structure characterization method, double cantilever beam delamination, was developed to determine the triple phase boundary structure for the thin-film electrode. …”
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Thesis -
2530
Investigations into femtosecond laser hybrid manufacturing for 3D power sources
Published 2021“…These VPGs are then demonstrated as active beam steering units and tuneable spectroscopic optical elements. …”
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Thesis-Doctor of Philosophy -
2531
Light-matter interactions in atomically thin transition metal dichalcogenides
Published 2021“…Following the carrier relaxation in the systems, the slow recovery process lasts for several tens of ps. By coherently superimposing monolayer exciton and cavity photons, when the system is in the strong coupling regime, the formation of exciton polaritons potentially harnesses the valley-polarized polariton-polariton interactions for novel valleytronic devices. …”
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Thesis-Doctor of Philosophy -
2532
A multi-scale attributes attention model for transport mode identification
Published 2024“…Since the learned latent local attributes are significantly different from the global features (e.g. average/min/max travel speeds which are measurable quantities), an ensemble model based on Neural Decision Forest (NDF) is employed to fuse the heterogeneous features consisting of both measurable quantities and non-measurable elements for determining the transport mode. …”
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Journal Article -
2533
Compositionally graded alloys fabricated using the laser powder bed fusion technique
Published 2023“…In this study, among the several available AM processes, the LPBF technique is selected to fabricate compositionally graded alloys, as it has higher spatial resolution and lower cost, compared to directed energy deposition (DED) and electron beam powder bed fusion (EBPBF). With three different LPBF setups and four alloy systems examined in this study, the following objectives are achieved: (i) screening out, from a large range of compositions, the alloys that are amenable to LPBF, (ii) examining the effects of the LPBF characteristics, e.g., rapid cooling rate, on the micro-/meso-structure and properties of the fabricated parts with varying chemical compositions, and (iii) evaluating the fabrication methods in terms of types of achieved gradation (stepwise or smooth), efficiency, and level of chemical segregation. …”
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Thesis-Doctor of Philosophy -
2534
Synthesis and characterization of Cu-Chalcogenide nanocrystals for potential applications in low-cost solar cells
Published 2013“…Since the opto-electrical properties of the NCs are highly dependent on the composition and crystal structure, X-ray diffraction, selected area electron diffraction, convergent beam electron diffraction and Raman spectroscopy were used to determine their crystal structure. …”
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Thesis -
2535
Exploring connections between seagrass ecosystem services and meadow hydrodynamics
Published 2024“…For more flexible leaves, defined as having a ratio of drag force to restoring force due to stiffness greater than 100, drag reduction due to current-induced deflection competes against drag augmentation due to lower relative motion, such that enhancing current speeds reduces wave energy dissipation only when the current velocity is less than one-third of the maximum wave velocity. …”
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Thesis -
2536
Understanding Chromatin Organization and Dynamics with Coarse-Grained Modeling
Published 2024“…OpenABC incorporates diverse CG force fields within an extensible framework and is built on a simulation platform that supports GPU acceleration, thus speeding up CG simulations. In Chapters 4 and 5, we shift our focus to the applications of CG simulations. …”
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Thesis -
2537
The sensitivity of tsunami models and tsunami energy to geologically constrained fault sources and shallow bathymetry
Published 2023“…In contrast, the d´ecollement which is much wider (tens to hundreds of kilometers) is not significantly affected by water damping, and it can more easily trigger large tsunamis. …”
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Thesis-Doctor of Philosophy -
2538
Solution processed transition metal oxides selective contacts for Si heterojunction solar cells
Published 2021“…In this work, we have first prepared hole selective contacts using solution processed MoOx (s-MoOx) by spin-coating and physical evaporated MoOx (e-MoOx) by electron beam evaporator. The performance of the s-MoOx/Si HSC has been investigated and optimized, which has been demonstrated solar cell efficiency of 12.5% for s-MoOx/Si HSC that is comparable to efficiency of 13.3% for e-MoOx/Si HSC. …”
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Thesis-Doctor of Philosophy -
2539
Enhancing tensile and fatigue properties of additively manufactured alloys by post-processing heat treatment
Published 2022“…Amongst the different AM techniques, laser beam-powder bed fusion (LB-PBF) is the most abundantly investigated process due to its deep market penetration as well as the vast number of LB-PBF machine manufacturers. …”
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Thesis-Doctor of Philosophy -
2540
Methods of growth and transfer of carbon nanotubes onto substrates for advanced electrical and electronic applications
Published 2023“…However, the main concern of CNT growth on non-planar substrates is the uneven deposition of catalysts due to the direction dependence of the E-beam deposition method. In this context, a dip-coating method for catalyst deposition is developed and optimised to synthesize CNT on GF. …”
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Thesis-Doctor of Philosophy