Browsing Doctoral Degrees (Physics) by Title
Now showing items 27-46 of 82
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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 non-homogeneous gas distributions.
(1995)No abstract available. -
Linear and nonlinear electron-acoustic 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 electron-positron plasmas.
(2009)The behaviour of both small amplitude and arbitrary amplitude nonlinear electrostatic fluctuations are studied in electron-positron 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 kinetic-theoretical approach is used to study ion Bernstein waves in an electron-proton 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 ... -
The measurement of electric quadrupole moments of gas molecules by induced birefringence.
(1993)Determining the electric quadrupole moments of gas molecules from measurements of birefringence induced in the gas by an applied electric field gradient is widely recognised as being the most direct experimental technique ... -
Measurement of the temperature dependence of the Buckingham effect (electric-field-gradient-induced birefringence) in gases
(2009)The aim of this research project was to assemble an apparatus to measure the electric quadrupole moments of gas molecules using the technique of electricfield- gradient-induced birefringence, or the Buckingham effect. ... -
The morphology of radiation damage in copper irradiated with neutrons at elevated temperatures.
(1977)This thesis is an investigation of the radiation damage morphology of high purity copper crystals irradiated with fast neutrons at temperatures in the range of 250C to 4OO C. At these high temperatures neutron damage ... -
Multi-wavelength study of radio sources in the universe.
(2009)This thesis presents a detailed multi-wavelength study of radio sources. A major part of the thesis focuses on radio sources in the FIRST survey while the latter part of the thesis studies low redshift radio galaxies in ... -
Non-linear multivariate analysis of the global solar radiation received across five cities in South Africa.
(2019)South Africa is considered one of the most developed countries in Africa, however with more than 80% of its electricity being generated from coal, this country is considered one of the highest contributors to greenhouse ... -
Numerical cavity-resonance modelling of impulse excited Pi 2 pulsations in the magnetosphere.
(1993)A magnetohydrodynamic (MHD) cavity-resonance model is developed to study the ultra low frequency (ULF) response in the magnetosphere to an external compressional impulse. It is assumed that the magnitude of the impulse is ... -
Numerical simulation of quantum spins in a dissipative environment.
(2015)When modelling real physical systems, one should always consider the influence of the environment. The study of open quantum systems aims precisely at the assessment of the role of the environment in the evolution of ... -
On the interaction of laser beams with air : with specific reference to refraction and scattering.
(1996)The interaction of laser light with a parcel of air with a known density structure can result in one of three reactions. The simplest of these reactions is reflection. Depending on the nature of the density profile, that ...