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Now showing items 711-720 of 2111
Precision diagnostics of pulsation and evolution in helium-rich low-mass stars
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)
In this thesis we discuss many types of low mass stars linked by their unusually low hydrogen atmospheric abundance, usually completely replaced with helium. We begin with the hot subdwarfs; subdwarf O and B (sdB, sdO) ...
Nine-channel wavelength tunable single mode laser array based on slots
(2013)
A 9-channel wavelength tunable single-mode laser array based on slots is presented. The fabricated laser array demonstrated a threshold current in a range of 19~21 mA with the SOA unbiased at 20?C under continuous wave ...
Atomistic simulations of surface reactions in ultra-high-temperature ceramics: O2, H2O and CO adsorption and dissociation on ZrB2 (0001) surfaces
(2021)
Understanding surface reactivity is crucial in many fields, going from heterogeneous catalysis to
materials oxidation and corrosion. In order to better decipher the initial stage of surface reactions
of ZrB2 exposed to ...
Reversible hydrogen control of antiferromagnetic anisotropy in α-Fe2O3
(2021)
Antiferromagnetic insulators are a ubiquitous class of magnetic materials, holding the promise of low-dissipation spin-based computing devices that can display ultra-fast switching and are robust against stray fields. ...
Optical phonons in CdS nanocrystals: effects of size, shape and packing density
(Material Research Society, 2000)
High-temperature coherent transport in the XXZ chain in the presence of an impurity
(2018)
We study high-temperature spin transport through an anisotropic spin-12 Heisenberg chain in which integrability is broken by a single impurity close to the center of the chain. For a finite impurity strength, the level ...
Broadband saturable absorption and exciton-exciton annihilation in MoSe2 composite thin films
(2019)
Polyvinyl alcohol (PVA) was utilized as a matrix to host two-dimensional (2D)
liquid-phase-exfoliated MoSe2 nanosheets. These 2D MoSe2/PVA composite thin films were
experimentally proven to be preferable for efficient ...
Dynamical exchange interaction from time-dependent spin density functional theory
(2013)
We report on ab initio time-dependent spin-dynamics simulations for a two-center magnetic molecular complex within the framework of the time-dependent noncollinear spin-density functional theory. In particular, we discuss ...
Radioactivity from building materials in the Republic of Ireland
(Trinity College (Dublin, Ireland). School of Physics, 2006)
This thesis presents the findings of a study undertaken to determine the radioactivity present
in building materials in the Republic of Ireland. A total of 70 samples of commonly used
building materials was collected from ...
Linear and nonlinear optical characterisation of silicon nanowire structures
(Trinity College (Dublin, Ireland). School of Physics, 2008)
The morphological and optical properties of various silicon nanowire structures were
investigated. Photoluminescence was produced by all of the nanostructures and was
attributed to a variety of different mechanisms. Optical ...