Browsing Masters Degrees (Physics) by Title
Now showing items 100-119 of 133
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Quantum dynamics in classical constant-temperature baths.
(2012)In this dissertation the formulation of various integration algorithms is studied, with a view to simulate quantum-classical systems in contact with a thermal bath. In particular focus is given to the constant temperature ... -
Quantum dynamics in the partial Wigner picture.
(2013)The Wigner formalism can be used to provide a representation of quantum dynamics in a classical-like phase space. However, there are many cases, such as when dealing with spin systems in a dissipative environment, in ... -
Quantum Key Distribution for the undergraduate curriculum.
(2017)Quantum Key Distribution (QKD) is one of the technological applications of quantum mechanics. The technology allows two users to securely establish an unbreakable key. The key is used to encrypt and decrypt sensitive ... -
Radiating solutions with heat flow in general relativity.
(1994)In this thesis we model spherically symmetric radiating stars dissipating energy in the form of a radial heat flux. We assume that the spacetime for the interior matter distribution is shear-free. The junction conditions ... -
A robust air refractometer for accurate compensation of the refractive index of air in everyday use.
(2016)Abstract available in PDF file. -
A satellite and ground based study of fine structure in VLF whistlers.
(1992)The matched filtering technique for improving the spectral resolution of VLF whistlers, originally developed by Bhegin and Siredey (1964), has proven to be useful for extracting information about the magnetospheric plasma ... -
Second Kerr-effect virial coefficients of non-dipolar molecules with axial and lower symmetry.
(2016)Abstract available in PDF file. -
Security and entanglement in differential-phase-shift quantum key distribution.
(2009)Quantum key distribution (QKD) aims at the creation of a secret key in the two locations of partners, traditionally Alice and Bob, wishing to communicate in private. A generic QKD protocol utilises a quantum channel and ... -
Simple qubit systems in bosonic baths.
(2010)The study is focused on the thermal entanglement of spin chains. Chains consisting of two and three qubits are considered. These chains are considered open because they are coupled to bosonic baths at different temperatures. ... -
Single and double layer bulk heterojunction organic solar cell.
(2015)Bulk heterojunction photovoltaic device based on the binary organic comprised of P3HT:PCBM and PTB7:PCBM with weight ratio of 1:1 and 1:1.5 respectively. We used these blends as a photo-active layer with different ... -
A statistical lightning model.
(2012)The detailed spatial and temporal influence of lightning on precipitation losses from the Earth's radiation belts is not yet well known. The precipitation is mainly due to the pitch angle scattering of electrons by lightning ... -
Stratospheric ozone climatology and variability from ground-based and satellite observations over Irene, South Africa (25.5°S; 28.1°E)
(2014)The climatological characteristic of ozone over Irene (25.˚S, 28.1˚E) was assessed in this thesis using ground-based satellite observations. The aim of this was to examine the variability of both total and vertical ozone ... -
Structure and bi-magnetism of nanocomposites and nanoalloys synthesized by reduction of (Co, Ni) Fe2O4 nano-ferrites.
(2014)Structural and magnetic properties of CoFe2O4, NiFe2O4 nano-ferrites, CoFe2O4 /CoFe2, NiFe2O4/NiFe bi-magnetic nanocomposites and CoFe2, NiFe alloys were studied. The nano-ferrites were synthesised using the glycol-thermal ... -
A study of plasma source ion implantation.
(1993)The work described in this thesis is an analysis of the Plasma Source Ion Implantation (PSII) process. A metal target is placed within a plasma, and pulsed to a high negative potential (10 - 50 kV). The electrons in the ... -
A study of the 90Zr(n,d)89Y reaction.
(1986)A study has been made of the 90 Zr(n,d) 89 Y reactlion at an incident neutron energy of 22 MeV. The experimental aspect of the study was performed at the Van der Graaf facility at the National Accelerator Centre, ... -
A study of the interaction of strong electromagnetic waves and anisotropic ion beams with a background plasma.
(1989)The interaction of an anisotropic (in velocity space) ion beam with an isotropic background hydrogen plasma is theoretically investigated. The length and time scales are such that both the ions and electrons are magnetized. ... -
Superthermal particle effects on solitons in a symmetric four-species electron-positron plasma.
Abstract available in PDF file.