Browsing Doctoral Degrees (Physics) by Title
Now showing items 52-71 of 82
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Quantum analogues of classical optimization algorithms.
(2017)This thesis explores the quantum analogues of algorithms used in mathematical optimization. The thesis focuses primarily on the iterative gradient search algorithm (algorithm for finding the minimum or maximum of a ... -
Quantum machine learning for supervised pattern recognition.
(2017)Humans are experts at recognising patterns in past experience and applying them to new tasks. For example, after seeing pictures of a face we can usually tell if another image contains the same person or not. Machine ... -
Quantum simulation of open quantum systems.
(2016)Over the last two decades the field of quantum simulations has experienced incredible growth, which, coupled with progress in the development of controllable quantum platforms, has recently begun to allow for the ... -
A ray tracing study of VLF phenomena.
(1997)Whistlers have, for many years, been used as probes of the ionosphere and magnetosphere. Whistlers received on the ground have been shown (Smith [1961], Helliwell [1965]) to have propagated, in almost all cases, through ... -
Refractive effects in phase objects and associated phenomena.
(1994)The effect of the refraction of a laser beam propagating through three different phase objects, i.e. a laser produced plasma and two different gas media, is investigated in this thesis. It is shown that these effects ... -
Simulating thermal fluctuations in soft matter models.
(2015)The research carried out in this work is in two parts: In the first part, we derive a configurational temperature Nosé-Hoover thermostat by reformulating the original Braga and Travis thermostat [J. Chem. Phys. 123 ... -
Solar influences on Polar ozone.
(1994)Measurements by the TOMS instrument aboard the Nimbus 7 satellite, of total column ozone over polar regions have been studied to determine the effects of solar induced natural ozone modulation. Two different analysis methods ... -
Sound transmission analysis by sound intensimetry.
(1985)This thesis represents the development and evaluation of a theory for sound transmission analysis by sound intensimetry. In the context of this study sound transmission analysis is understood to embrace the following: (1) ... -
The structural and mechanical properties of the Pt-Ti and Ir-Ti systems.
(2011)Ab initio plane wave based density functional calculations within the generalised gradient approximation (GGA) have been carried out on a wide range of phases and stoichiometries for the platinum-titanium (Pt-Ti) and ... -
Studies on atmospheric tides and planetary waves in the mesosphere-lower thermosphere (MLT) region using SuperDARN HF radars and meteor radar.
(2013)In this work, observational results of atmospheric dynamics caused by upward propagating atmospheric waves (tides, planetary waves and their interactions) in mesosphere-lower thermosphere (MLT) region are presented. This ... -
Studies on the influence of magnetic cloud, stream interface and polar mesospheric summer echoes in the mesosphere and lower thermosphere (MLT) region using model calculations and observations.
The response of Mesosphere and Lower Thermosphere (MLT) temperature to energetic particle precipitation over the Earth's polar regions is not uniform due to complex phenomena within the MLT environment. Nevertheless, the ... -
A study of the vanadium oxide bronze 0-VOB, and vanadium oxides V2O5 and VO2, using hyperfine interaction techniques.
(1999)One of the main interests in the vanadium oxides V2O5 and VO2 is that, when doped with a metal such as Fe, these oxides display semiconductor-to-metal transitions at certain critical temperatures. These transitions are ... -
A study of wave induced electron precipitation at low and middle latitudes.
(1991)Wave induced electron precipitation (WIEP) can modify the ionosphere above a sub-ionospherically propagating VLF signal in such a way as to perturb the amplitude and phase of the signal: The "Trimpi Event". In this ... -
A study of whistlers and related VLF phenomena.
(2012)Whistlers are naturally occurring Very Low Frequency (VLF) phenomena which are the result of lightning-radiated electromagnetic waves propagating in Earth’s plasma environment. Major research into whistlers and their ... -
Study on 2002 sudden stratospheric warming, mesopher-lower thermospheric wind structure and dynamics and middle atmospheric structure, based on superDARN HF RADAR, LIDAR, Riometer, satellites and models.
(2012)In this thesis, the dynamics and coupling in the middle atmosphere over the Southern Hemisphere are investigated using SuperDARN high frequency (HF) radar wind data, satellites, light detection and ranging (LIDAR), the ... -
Sugar crystal size characterization using digital image processing.
(2007)The measurement of the crystal size distribution is a key prerequisite in optimising the growth of sugar crystals in crystalisation pans or for quality control of the final product. Traditionally, crystal size measurements ... -
Superpositions of light fields carrying orbital angular momentum.
(2012)The work presented in this thesis is centred on the generation of superimposed optical fields which each carry orbital angular momentum (OAM) and the development of OAM measurement techniques. Optical fields which carry ... -
Synthesis and magnetic properties of Sn, Mn and Mg substituted Fe(x) Cr(1.8−x) O(3) nano oxides.
(2016)Abstract available in PDF file.