Browsing Physics (Theses and Dissertations) by Title
Now showing items 316-335 of 418
-
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 ... -
Selective gene fishing in complex genomic environments using micro-cantilevers : applications in RNAi therapy
(Trinity College (Dublin, Ireland). School of Physics, 2012)Genes and their role in disease origins and proliferation have been of great interest for molecular medicine. Their functions and roles have been recently shown to be moderated by RNA interference (RNAi), a natural phenomenon ... -
Self-assembled arrays of magnetic nanostructures on morphologically patterned semiconductor substrates
(Trinity College (Dublin, Ireland). School of Physics, 2014)This thesis deals with the formation of morphological patterns on single-crystal semi-conductor surfaces via self-assembly processes, followed by the subsequent fabrication of magnetic nanostructures whose dimensions are ... -
A self-contained ground-state approach for the correction of self-interaction error in approximate density-functional theory
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)Density functional theory (DFT), in its approximate Kohn-Sham formalism, is a highly-acclaimed computational tool that affords the practical and expeditious calculation of ground-state properties of molecules and solids, ... -
Signal quality monitoring for optical communications networks
(Trinity College (Dublin, Ireland). School of Physics, 2010)The subject of this thesis is optical performance monitoring for transparent optical communications networks. To this end, a series of techniques for the characterisation of ultrashort telecommunications pulses were ... -
Simulation and analysis of foam structure
(Trinity College (Dublin, Ireland). School of Physics, 2017)We use the method of bond-orientational order parameter analysis on X-ray tomographic data to investigate the interal structure of an experimental sample of ~25 000 microbubbles. By employing appropriate cutoff distances ... -
Simulations of foams and liquid surfaces
(Trinity College (Dublin, Ireland). School of Physics, 2001)In this thesis, we combine physics and numerical methods to describe the basic properties of foams and liquid surfaces. In Part I, we provide a brief general introduction to the subject of foam physics, detailing what a ... -
Size Selection And Monolayer Enrichement In Liquid Exfoliated Tungsten Disulphide Dispersions.
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)Since the the discovery of graphene in 2004, the scientific environment turned its great interest towards new type of nanomaterials, commonly called two dimensional (2D) layered nanomaterials. Over last 15 years, they ... -
The solar origins and earth impacts of space weather
(Trinity College Dublin. School of Physics. Discipline of Physics, 2020)Coronal Holes (CHs) are expansive, low density, open magnetic field regions which appear dark in extreme-ultraviolet (EUV) images of the solar corona. CHs are associated with the acceleration of the high speed solar wind ... -
Solution phase silver nanostructures for ehanced localized surface plasmonic sensing
(Trinity College (Dublin, Ireland). School of Physics, 2010)A detailed study of the Localized Surface Plasmon Resonances (LSPR) of a range of solution phase silver nanostructure sols and their refractive index sensitivity is presented. This work focuses on developing a thorough ... -
Solution processed Group V1 transition metal dichalcogenides : a study on conductive hybrids and photoconductivity for future applications in printed electronics
(Trinity College (Dublin, Ireland). School of Physics, 2014)Transition metal dichalcogenides (TMDs) constitute a class of inorganic layered compound with generalised MX2 stoichiometry, where M denotes a transition metal atom and X a chalcogen atom of sulfur, selenium or tellurium ... -
Solution Processed Semiconducting Nanosheet Networks Towards Optoelectronic Applications
(Trinity College Dublin. School of Physics. Discipline of Physics, 2024)Two-dimensional (2D) semiconducting transition metal chalcogenides (TMDs) are attractive materials owing to their superb electronic and optoelectronic properties. The great advancement of material exfoliation and thin film ... -
Spectroscopic and Microscopic Characterisation of Liquid Phase Exfoliated 2D Materials
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)Since the experimental isolation of graphene nearly two decades ago, the research into two-dimensional materials has accelerated at a tremendous rate across a vast range of scientific and engineering fields. Liquid phase ... -
Spectroscopic studies of on-surface synthesis of chiral graphene nanoribbons
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)The field of on-surface synthesis bridges physics, chemistry, material and surface science by combining the tunability of molecular materials, the advantages of self-assembly with the sturdiness of covalently bonded ... -
Spectroscopic studies of self-assembled plasmonic nanoparticle arrays
(Trinity College (Dublin, Ireland). School of Physics, 2011)In this thesis an alternative self-assembled deposition technique able to produce nanoparticle (NP) arrays ordered on the macroscale is described. Stepped surfaces are produced by high temperatures annealing AI3O4 (0001) and ... -
Spin injection, detection and magnetoresistive effects in organic systems
(Trinity College (Dublin, Ireland). School of Physics, 2015)Because of the weak spin-orbit interaction in organic systems, very long spin lifetimes are intuitively expected. The prospect of cheap and flexible spintronics devices makes organic semiconductors an attractive class of ... -
Spin transfer torque magnetisation switching in MgO based magnetic tunnel junctions
(Trinity College (Dublin, Ireland). School of Physics, 2010)Magnetic tunnel junctions (MTJ) are important magnetic elements that are used as memory and sensor devices. In this thesis, first, the fundamentals of MTJs were explored by investigating different tunnel barrier materials, ... -
Spin transport in magnetic nanostructures
(Trinity College (Dublin, Ireland). School of Physics, 2005)The study presented in this thesis is concerned with the spin dependent transport and spin transfer in magnetic nanostructures. The first two chapters are dedicated to introduce spin-electronics, electrical transport and ...
