Browsing by Supervisor "Steyn-Ross, D. Alistair"
Now showing items 1-19 of 19
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A Population Model of the Thalamus and its Wave Interactions with the Cortex
(University of Waikato, 2014)In this thesis we construct a population model of the thalamus based on the mean-field cortex developed by Steyn-Ross et al. and Liley et al. We allow interactions between the thalamus and cortex via damped wave equations ... -
Analysis of pattern dynamics for a nonlinear model of the human cortex via bifurcation theories
(University of Waikato, 2014)This thesis examines the bifurcations, i.e., the emergent behaviours, for the Waikato cortical model under the influence of the gap-junction inhibitory diffusion D₂ (identified as the Turing bifurcation parameter) and the ... -
Analysis on Supercapacitor Assisted Low Dropout (SCALDO) Regulators
(University of Waikato, 2014)State-of-the-art electronic systems employ three fundamental techniques for DC-DC converters: (a) switch-mode power supplies (SMPS); (b) linear power supplies; (c) switched capacitor (charge pump) converters. In practical ... -
Design and demonstration of a mouse-specific Transcranial Magnetic Stimulation coil in-vitro
(The University of Waikato, 2021)In Transcranial Magnetic Stimulation, rapid electromagnetic fields (EM) are applied to the brain. The fundamental effects of TMS are poorly understood so we need smaller coils to perform invasive measurements on mice. Based ... -
Design of SCALDO based high-current DC power supply
(The University of Waikato, 2021)Supercapacitor assisted (SCA) techniques are primarily based on supercapacitors having in the order of one million times more capacitance, together with one to two orders of magnitude smaller equivalent series resistance ... -
Dynamics and precursor signs for phase transitions in neural systems
(University of Waikato, 2014)This thesis investigates neural state transitions associated with sleep, seizure and anaesthesia. The aim is to address the question: How does a brain traverse the critical threshold between distinct cortical states, both ... -
Efficiency enhancements to a linear AC voltage regulator: Multi-transformer and multi-winding designs
(The University of Waikato, 2020)Utility companies are expected to distribute electricity that conforms with international or national standards related to RMS voltage fluctuations. However, RMS voltage variations sometimes exceed acceptable limits and ... -
Electrical Conductivity of Brain Cortex Slices in Seizing and Non-seizing States
(University of Waikato, 2013)The electrical conductivity of thin living slices of mouse cerebral cortex is measured. Two only out of fifteen different attempting ways were effective. I have successfully measured the electrical conductivity of mouse ... -
Investigating the dynamics of a population of spiking neurons across spatial scales
(The University of Waikato, 2021)Mean-field models describe bulk neural activity in terms of population-average action potential (spike) rates, but do not attempt to address the variations in the firing activity of individual neurons and the interactions ... -
Investigation and Modelling of Fetal Sheep Maturation
(University of Waikato, 2010)In this thesis, I study the maturational changes of the fetal sheep ECoG (electrocorticogram) in its third-trimester of gestation (95-140 days of gestation), investigate three continuum models for electrical behaviour of ... -
Investigation of surge propagation in transient voltage surge suppressors and experimental verification
(University of Waikato, 2014)An on-going question in the field of surge protection study is how to predict incipient failure of power electronics in the event of a short time, high voltage, and high energy transient surge propagation. The work presented ... -
Modelling the spatial effects of the anaesthetic-induced phase-transition in the cerebral cortex
(University of Waikato, 2003)In this thesis I investigate the theoretical stochastic behaviour of a one-dimensional model of the cerebral cortex, exposed to varying concentrations of a general anaesthetic agent. The model is that of Steyn-Ross et al. ... -
NiMH battery forensics: Instrumentation, modelling and prognostics for identifying failure
(University of Waikato, 2016)Battery forensics is a growing research field that is becoming increasingly important with the introduction of hybrid-electric and electric vehicles. The need to correctly diagnose battery condition and predict signs of ... -
Permeance based modelling, design and optimization of supercapacitor assisted surge absorber (SCASA)
(The University of Waikato, 2021)Supercapacitor assisted (SCA) techniques are a unique set of circuit topologies designed to fulfil power conversion and protection tasks by circumventing the energy losses normally associated with RC based circuits. With ... -
Predicting and identifying signs of criticality near neuronal phase transition
(The University of Waikato, 2020)This thesis examines the critical transitions between distinct neural states associated with the transition to neuron spiking and with the induction of anaesthesia. First, mathematical and electronic models of a single ... -
Supecapacitor-assisted Temperature Modification Apparatus (SCATMA) and Fast Supercapacitor Charger
(University of Waikato, 2016)This thesis presents the design and development of the supercapacitor-assisted "instant" water heating system as well as a new power converter topology to fast charge a supercapacitor bank. Delayed delivery of hot water ... -
Supercapacitor assisted LED (SCALED) converter technique for solar powered DC-microgrids
(The University of Waikato, 2020)Designing electronic products and systems with high energy efficiency is a major challenge for electronic power circuit designers. Almost all residential and industrial buildings are presently AC powered. However, they ... -
Supercapacitor-based linear converter for voltage regulator modules
(University of Waikato, 2016)This thesis investigates a linear converter technique suitable for microprocessor voltage regulator modules (VRMs). The original linear regulator is the patented supercapacitor assisted low-dropout regulator (SCALDO). A ... -
Theoretical and experimental investigation of anaesthetic effects in the brain
(University of Waikato, 2016)The main motivation of this study is to develop a better understanding of anaesthetic drug effects on brain dynamics including the paradoxical enhancement of seizure activity by some anaesthetic drugs. This thesis investigates ...
