Now showing items 1-10 of 217
End-pumped solid-state lasers.
This dissertation consists of four sections, with the focus on near- and mid-infrared lasers using Yttrium Lithium Fluoride (YLF) crystals doped with various rare-earth ions as a gain medium. As introduction a general ...
Mössbauer study of the hyperfine magnetic field and electric field gradient at Fe sites in synthetic diamond.
Mossbauer Spectroscopy has been used to investigate the site of Fe inclusions in a suite of synthetic diamonds (de Beers MDAS). Information on the hyperfine magnetic fields and electric field gradients at Fe sites in ...
A study of wave induced electron precipitation at low and middle latitudes.
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 ...
Constant-temperature dynamics in the Wigner representation of quantum mechanics.
This dissertation deals with theory and algorithms for computer simulations of classical and quantum systems in the canonical ensemble. First, the approach of Nos e-Hoover and its generalization, known as the Nos e- Hoover ...
Experimental measurement of the fluctuations of a laser beam due to thermal turbulence.
In this work, we considered and developed a new method to detect and quantify the fluctuations of a laser beam due to thermal turbulence. The new method consisted of a single laser beam propagating in air and passing ...
A study of the 90Zr(n,d)89Y reaction.
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, ...
Linear and nonlinear fluctuations in electron-positron plasmas.
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 ...
The association between VLF and ELF chorus emissions and electron precipitation.
This is an investigation into the association between ionospheric absorption caused by electron precipitation and ELF:3 Hz-3 kHz and VLF:3 kHz-30 kHz, chorus. Ionospheric absorption was measured using the chain of riometers ...
Computational studies of percolation : determination of the cluster number scaling function for lattices in 2 dimensions.
The main aim of this work is to study percolation theory on regular two dimensional