Browsing Physics (Theses and Dissertations) by Title
Now showing items 124-143 of 417
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Galaxy clusters, voids and elliptical galaxies using the ROSAT PSPC
(Trinity College (Dublin, Ireland). School of Physics, 2003)The ROSAT data archive contains of the order of 100,000 sources observed by the ROSAT PSPC (Position Sensitive Proportional Counter). For many sources detected with the ROSAT PSPC there is not a sufficient number of photons ... -
Gamma Ray Bursts : probing burst environments in high redshift galaxies
(Trinity College (Dublin, Ireland). School of Physics, 2008)First discovered in the late 1960s, Gamma Ray Bursts have remained something of a cosmic mystery for almost four decades. It has only been quite recently that the nature of these phenomena is beginning to be understood. ... -
Generation, characterisation and solidification of crystalline microfoams
(Trinity College (Dublin, Ireland). School of Physics, 2008)This study is centered around the spontaneous ordering of equally sized microbubbles on top of a liquid pool, forming wet crystalline microfoams. This type of ordering was firstly observed by Bragg and Nye in 1947 and only ... -
Graphene Based Membranes for Osmosis Applications
(Trinity College Dublin. School of Physics. Discipline of Physics, 2020)With the discovery of two-dimensional hexagonal graphene (single layer of graphite), a tremendous interest has grown due its remarkable properties. Apart from all other properties, its superior thickness (one-atom thick) ... -
Graphene-nonlinear optical properties and modelocking capabilities
(Trinity College Dublin. School of Physics. Discipline of Physics, 2020)In this thesis, graphene saturable absorber mirror's (SAM) potential for mode-locking ultrafast lasers has been demonstrated, in particular at 2 μm. The saturable absorption of graphene thin films (prepared via drop-casting ... -
The Growth and Characterisation of Mn2Au Thin Films and Heterostructures
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)In this thesis, Mn2Au thin films and heterostructures are grown via molecular beam epitaxy. Mn2Au thin films are investigated on MgO (001) and Al2O3 (1102) substrates, and on Pt (111) seed layer grown on an Al2O3 (0001) ... -
Growth and electrical characterisation of conjugated polymer nanostructures
(Trinity College (Dublin, Ireland). School of Physics, 2011)The field of conductive polymers is one in which there has been much interest in the last number of years. Two of the most common conductive polymers, polypyrrole and poly(p-phenylene vinylene) are investigated in the ... -
Hard Spheres, Soap Bubbles, and Hydrogels in Research and Education
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)This thesis concerns various experiments using hard spheres, soap bubbles, hydrogel spheres, and soap films in which we will show these are suitable candidates for research and can be easily performed in universities, ... -
Heat Transfer in Open Quantum Systems
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)In most situations of practical interest, quantum systems are not isolated from their surroundings but are interacting with an environment. The importance of such situations has been highlighted, for example, in the fields ... -
Highly conductive, transparent and flexible networks of quasi 1-Dimensional metallic nanostructures
(Trinity College (Dublin, Ireland). School of Physics, 2011)Direct current conductivity and morphological characterization has been performed on a wide range of films made from bundled single wall carbon nanotubes, produced by a selection of commercial suppliers. The conductivity ... -
Implementation of self interaction free density functional methods and applications to dilute magnetic semiconductors
(Trinity College (Dublin, Ireland). School of Physics, 2008)The present thesis mainly deals with the implementation of self interaction free density functional methods in a numerically efficient density functional theory code SIESTA and the application of the said methods in ab-inito ... -
Implications of antiphase boundaries (APBs) on the strain relaxation and magnetotransport properties of Fe3o4 hetero-epitaxial thin films
(Trinity College (Dublin, Ireland). School of Physics, 2007)The strain relaxation and magneto transport properties of epitaxial magnetite (Fe3O4) thin films were studied. Epitaxial Fe3O4 film s were grown on MgO and MgAl2O4 substrates using an Oxygen plasma assisted Molecular beam ... -
Improved Efficiency and Longevity of Solar PV Systems Through Enhanced Passive Convection
(Trinity College Dublin. School of Physics. Discipline of Physics, 2024)Solar PV technology is growing rapidly and becoming a crucial part of international and national energy infrastructure. Current commercially sold Si solar PV (Photovoltaic) panels, with ~21% efficiency and a projected ... -
Improved Solar Thermal Technology For Decarbonising Residential Heating
(School of Physics, Physics, 2023)The field of solar energy harvesting has emerged over the last number of years as one with considerable scope to provide clean and renewable electricity and heat. Solar Thermal (ST) technology is vital to tackle the pressing ... -
Impurities and magnetic interactions in graphene : a theoretical study
(Trinity College (Dublin, Ireland). School of Physics, 2012)Graphene is a two-dimensional carbon material that until its recent discovery was assumed not to exist in the free state. Graphene-related materials have been in the scientific limelight since then due to several key ... -
The in-situ structural characterization of layered double hydroxide materials in catalytic and biological applications
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)The overall aim of this PhD research is to understand the physical behaviours of layered double hydroxide (LDH) nanomaterials in applied environments. Two aspects of LDH-based applications were studied. Firstly, the thermal ... -
Inferring the Surface Energy Distribution of Low Dimensional Materials
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)Two dimensional nanomaterials exhibit novel and superlative properties, as such; the last decade has seen huge research interest in 2D nanomaterials. To fully exploit these properties it is essential to ... -
Influence of magnetic fields on cathodic growth of phases in acidic sulphate and acidic copper sulphate systems
(Trinity College (Dublin, Ireland). School of Physics, 2011)Industrial processes involving copper electrolysis are important in modern society. In these processes copper ions contained in aqueous solution are crystallized onto a cathode by the passage of current. Copper industry ... -
Inkjet Printed Energy Storage Systems for Electrochemical Testing and In-Situ TEM Analysis
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)Understanding of how materials store charge in supercapacitor and battery systems is fundamental to improving these classes of energy storage devices. While materials can be analysed and examined before they are incorporated ... -
Instrumentation and techniques in confocal microscopy
(Trinity College (Dublin, Ireland). School of Physics, 2007)Liquid crystal variable focal length microlenses are designed, fabricated and tested for inclusion into the confocal system. Their emerging light fields are imaged and examined. This proves a novel, efficient and thorough ...
