Browsing Physics (Theses and Dissertations) by Title
Now showing items 299-318 of 420
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Probing outflows from young stars and brown dwarfs
(Trinity College (Dublin, Ireland). School of Physics, 2005)The phenomenon of mass outflow from young stellar objects, is arguably the most spectacular stage in the formation of a star. Much is known about the large scale manifestations of outflows and many breathtaking images ... -
Probing the Solar Corona at High Temporal and Spatial Resolution with the Low Frequency Array
(Trinity College Dublin. School of Physics. Discipline of Physics, 2022)The solar corona is the outermost layer of the Sun's atmosphere. Advancements in radio astronomy over the last 50 years have revealed a number of radio phenomena which occur in the corona each with different temporal and ... -
Propagation of coronal mass ejections in the inner heliosphere
(Trinity College (Dublin, Ireland). School of Physics, 2011)Solar Coronal mass ejections (CMEs) are large-scale ejections of plasma and magnetic field from the corona, which propagate through interplanetary space. CMEs are the most significant drivers of adverse space weather on ... -
Properties of lightweight fibrous materials made using a foam-forming technique
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)This thesis concerns the production and characterisation of foam-formed fibrous materials made from wood, peat fibres and spent grain. Such materials might find commercial applications for insulating purposes when produced ... -
Properties of massive stars before death
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)Despite their importance, there is a lot yet to be learned regarding massive stars, particularly those at late evolutionary stages. In the first of two studies presented here, we investigate a suspected very massive star ... -
Pulse formation and dynamics in self-pulsating semiconductor laser diodes
(Trinity College (Dublin, Ireland). School of Physics, 2000)Self-pulsating lasers emitting at 800 nm are used in compact disc (CD) players because their low coherence makes them relatively insensitive to optical feedback. The ever increasing demand for higher capacity storage on ... -
Purification and electrical characterisation of nanotube and nanowire - polymer composites
(Trinity College (Dublin, Ireland). School of Physics, 2006)The yield and purity of multiwalled carbon nanotube (MWNT) soot was maximised by control of production parameters. The optimal production parameters were found to be J = 190 A/cm2 and P = 500 Torr achieving a yield of up ... -
Quantifying Battery Rate Performance
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)The global energy demand is quickly increasing and sustainable energy solutions are needed to keep pace. Batteries have emerged as the premier energy storage solution for increasing the adoption of renewable energy sources, ... -
Quantum Control of Thermodynamic Processes in Semiconductors
(Trinity College Dublin. School of Physics. Discipline of Physics, 2022)In this thesis, we explore theoretically the thermodynamics of heat exchange in laser driven solid state systems. In particular, we focus on the heat exchanged between phonons and a semiconductor quantum dot exciton, driven ... -
Quantum theory of multimode exciton-polariton Bose-Einstein Condensation
(Trinity College (Dublin, Ireland). School of Physics, 2013) -
Quantum transport in 2D materials: Theoretical and computational optimisation of large heterostructures with spintronics properties
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)Graphene is a monolayer of carbon atoms arranged in a hexagonal lattice, making it the thinnest and strongest material known to man. Its exceptional electronic and thermal properties have generated great interest for its ... -
Quasi-Periodic Pulsations in Solar Flares and the Earth's Ionosphere
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)Solar flares are the most powerful and energetic physical phenomena in our solar system, releasing radiation across the whole electromagnetic spectrum with total energies reaching on the order of 10^25 in a matter of ... -
Radio interferometric studies of cool evolved stellar winds
(Trinity College (Dublin, Ireland). School of Physics, 2013) -
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 ... -
Red giant mass-loss : studying evolved stellar winds with FUSE and HST / STIS
(Trinity College (Dublin, Ireland). School of Physics, 2006)The changes that a star undergoes during the dying process are the most dramatic of its lifetime. These changes result in the most important interactions between a star and its environment, indeed it is in this area of ... -
Resonant soft X-ray spectroscopic studies of certain transition metal oxides
(Trinity College (Dublin, Ireland). School of Physics, 2011)Rutile-type transition-metal oxides are extremely fertile areas of study both for fundamental and technological reasons due to the range of physical properties they present, such as insulating TiO2, semiconducting Sn02 and ... -
Rheological and local fluid dynamics in foams
(Trinity College (Dublin, Ireland). School of Physics, 2005)This thesis explores the physics of foams, particularly those that are wet (i.e. have a high liquid fraction). The properties which are measured here relate to structure, drainage and rheology. We have performed the first ... -
Scanning near-field microscopy of microwave circuits
(Trinity College (Dublin, Ireland). School of Physics, 2002)The topic of this thesis is the development and testing of measurement techniques for high resolution imaging of the field induced by microwave circuits in the near-field region. The theoretical aspects of the near-field ... -
Search for magnets with properties intermediate between Nd-Fe-B and Ferrite
The rare earth elements neodymium, samarium, terbium and dysprosium are predominantly mined in China (>95%) there wild prices fluctuations in 2011 as a result of Chinese government policies undermined confidence in the ... -
Searching for signatures of electromagnetic cascades in the intergalactic medium initiated by blazars
(Trinity College (Dublin, Ireland). School of Physics, 2012)Very high energy (VHE) y-ray astronomy has opened a new window into the Universe at the highest energies, allowing the exploration of unique astrophysical phenomena. This thesis constitutes an observational contribution ...
