The focus of this dissertation is to present novel algorithms and techniques in wireless network systems aiming at performance optimisation. This thesis provides contribution to knowledge on the following topics: (a) sum rate maximisation of two interfering users in an Orthogona…
"539" Result
Sort By:
Slow light is the study of the dramatic change in the velocity of light as it travels through certain media. This thesis focuses on slowing caused by transmitting light through a ruby crystal. When ruby experiences spatial or temporal modulation from a laser beam, the velocity o…
Power-switching devices require low on-state conduction losses, high-switching speed, high thermal stability, and high input impedance. Using gallium nitride (GaN) based field-effect transistors, these properties for switching devices can be satisfied. GaN-based High Electron Mo…
In scanning probe energy loss spectroscopy (SPELS) an STM tip is used as a localised source of field emitted electrons by applying a high voltage. Energy loss measurements of the backscattered electrons provide spectroscopic information from the sample. The energy resolution is …
Chapter 1 gives the introduction of the main concepts and techniques throughout this thesis. Chapter 2 describes the control over the dimensions of various poly(L-lactide)-b-poly(acrylic acid) cylindrical micelles based on crystallization-driven self-assembly. Such change of the…
Organic Thin-Film Transistors (OTFTs) are now surpassing the performance of amorphous silicon based devices which once set the benchmark. State of the art development of OTFTs in active-matrix organic light emitting diodes (OLEDs) for flexible displays has shown the potential fo…
The T2K (Tokai-to-Kamioka) experiment is a long baseline neutrino oscillation experiment built, primarily, to measure the neutrino mixing angle 13. To determine this parameter with minimal uncertainty requires a good understanding of the initial neutrino flux in the beam and pre…
The detection of gravitational waves in the years to come will be the result of decades of work by institutions around the world to design and construct instruments to probe the characteristic strain of space-time on the smallest scales. Once detected, an entirely new field of s…
This project developed a robust and reliable process to pattern < 5 nm features in negative tone Hydrogen silsesquioxane (HSQ) resist using high resolution electron beam lithography and developed a low damage reactive ion etch (RIE) process to fabricate silicon nanowires on dege…
This thesis presents a systematic study on the characterising ultrafast dynamics of photo excited carriers in hydrogenated nano crystalline silicon (nc-Si:H) and porous silicon (PS) materials using the ultrafast optical pump probe spectroscopy approaches. The work involves the g…
Granular materials display a host of fascinating behaviours both remarkably similar to and strikingly different from those exhibited by classical solids, liquids and gases. Due to the ubiquity of granular materials, and their far-reaching importance in multitudinous natural and …
Low frequency radio astronomy allows us to observe the fainter and older synchrotron emission from the relativistic plasma associated with active galactic nuclei (AGN) in galaxies and clusters. In this thesis, we use the Giant Metrewave Radio Telescope to explore the impact that…
In the past decade the field of extra-solar planetary science has moved beyond simple detections of planets outside of our Solar System into more detailed characterisations of these objects. One avenue that is at the forefront of current research is the study of extra-solar plan…
A room temperature liquid scintillator time projection chamber has the potential to give both ne grained tracking and calorimetry, analogous to liquid argon, only without the cryogenic infrastructure. This type of detector would be invaluable as a cost effective, large volume de…
The mixed alkali borosilicate glass system used for high-level waste immobilisation, has been studied with different divalent additive oxides such as CaO, Srf), BaO, MnO, ZnO and PbO added to the BNFL base glass (MW). A number of techniques have been employed in order to study t…
Paired kitchen-living room dust samples from 30 UK houses were collected for the analysis of BFRs, including PBDEs, HBCDDs and PBEB, EH-TBB, BTBPE, BEH-TEBP, DBDPE. Ninety-six plastic kitchen utensils were collected, screened for Br concentration by X-ray fluorescence spectromet…
We investigate generalizations of coherent states as a means of representing the dynamics of excitations of the superconducting ground state. We also analyse the propagation of generalized coherent state wave packets under the Bogoliubov-de Gennes Hamiltonian. The excitations of…
This study explores the mediatisation of political challenges involved in addressing climate change, in particular relation to the United Nations framework in place to tackle the issue. Climate change is one of the most urgent issues of our time and extensive international colla…
Developing a Grid within High Energy Physics for the Large Hadron Collider particle accelerator is characterised as a highly collaborative, distributed and dynamic systems development effort. This research examines the way this distributed Grid is developed, deployed and provide…