Browsing Doctoral Degrees (Physics) by Title
Now showing items 1837 of 82

Electrostatic wave phenomena in dusty plasma.
(1995)This thesis is concerned with the some aspects of electrostatic wave phenomena dusty plasmas. In particular Debye shielding, nonlinear potential structures such as diploar vortices and solitons are investigated. The ... 
The evolution of orbitalangularmomentum entanglement of photons in turbulent air.
(2013)Quantum entanglement plays an important role in the emerging quantum information processing and communications tasks. To this day, almost all these tasks use quantum systems described by a two dimensional Hilbert space ... 
Exactly solvable models for qubits coupled to spin environments : decoherence and entanglement.
(2008)During the last decade the field of quantum information has seen considerable progress both theoretically and experimentally. The building block of this theory is the socalled qubit, the quantum counterpart of the ... 
Experimental investigation and theoretical analysis of the structural relaxation in amorphous Fe40Ni40B20.
(1998)Amorphous metallic alloys are produced by a variety of techniques some of which involve rapid solidification of the alloying constituents. In these methods the solidification occurs so rapidly that the atoms are frozenin ... 
Fabrication and characterization of solution processed thin film solar cells.
(2018)This research focused on developing new organic and inorganic semiconductor materials and techniques for use in design and fabrication of organic photovoltaic solar cells. Despite OPVs having benefitted from material ... 
Fe Mossbauer investigations in diamond, SiGe and Ge single crystals.
(2006)Abstract available in PDF file. 
Field and model studies of the nearshore circulation.
(1967)Investigations into the characteristics and underlying mechanism of the circulation of water near the shore are reported. The two main types of circulation, one a cellular system resulting from Haves propagated nearly ... 
First principles quantum mechanical studies of iridium : a focus on bulk and surface properties.
(2003)Recent highpressure experiments on iridium show a transition to a 14 atomic layer superlattice structure. Since iridium has a high bulk modulus, it is used in many highpressure applications, for instance as a gasket for ... 
Freespace communication in quantum key distribution.
(2015)Quantum cryptography permits the sharing of a secret key hence information between authorized parties such that an unauthorized party is unable to obtain any useful information. A quantum and a classical authenticated ... 
The influence of rotating and locked magnetic islands on edge transport in Tokoloshe tokamak.
(1993)The turbulence and fluctuation induced transport in the edge plasma of the Tokoloshe tokamak was studied using a Langmuir probe array. In this thesis three separate experiments are presented, each of which examines a ... 
Invariant multipole theory of induced macroscopic fields in homogenous dielectrics.
(2013)A harmonic plane electromagnetic wave incident on a molecule distorts its charge distribution, thereby producing an infinite series of induced multipole moments expressed in terms of contributions that are due to the ... 
Investigation of conceptual and language difficulties affecting the understanding of several mechanics concepts among some African teachers and students.
(1998)The results of national examination in matric and universities showed that African students were performing very poorly in their studies and examinations in science and in physics in particular. The objective in this ... 
An investigation of the nature of Pc5 pulsations using SuperDARN and magnetometer data.
Pc5 pulsations are global magnetohydrodynamic events in the magnetosphere. We employed an Automated Pulsation Finder program to identify significant Pc5 pulsation events in SuperDARN data. Those events for which a resonance ... 
Laser applications and refractive properties of nonhomogeneous gas distributions.
(1995)No abstract available. 
Linear and nonlinear electronacoustic waves in plasmas with two electron components.
(1991)Measurements of broadband electrostatic wave emIssons in conjunction with particle distributions in the earth's magnetosphere, have provided motivation for a number of studies of waves in plasmas with two electron components. ... 
Linear and nonlinear fluctuations in electronpositron plasmas.
(2009)The behaviour of both small amplitude and arbitrary amplitude nonlinear electrostatic fluctuations are studied in electronpositron plasmas. The propagation characteristics of associated linear modes are also examined ... 
Linear and nonlinear waves in space plasmas.
(2014)The work presented in this thesis is about a study of some linear and nonlinear plasma waves. Firstly, a kinetictheoretical approach is used to study ion Bernstein waves in an electronproton plasma with a kappa velocity ... 
Mass spectrometry characterisation of laser produced products.
(1999)Mass spectrometers are analytical instruments that convert neutral atoms and molecules into gaseous ions and separate those ions according to the ratio of their mass to charge, m/z. The measurement is reported as a ...