Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 242 for “"QC Physics"”.
-
DETERMINING THE QUALITY OF PASTEURISED AND HOMOGENISED COW MILK USING MICROWAVE SENSORS
More than 6 billion people worldwide consume milk and milk products and this number is rapidly growing every year (FAO, 2015a), there are numerous occurrences where the milk quality was below acceptable standards causing severe health hazards among consumers including young children. The aim of …
-
The effect of wind turbulence on noise barrier performance
An investigation has been carried out into the effect of wind turbulence on the propagation of sound over open grassland both with, and without, a 2.4m high barrier present. Sound bursts, derived from a variety of original signals, were generated using a horn loudspeaker and the resulting levels …
-
Single-sided magnetic nanoparticles imaging scanner for early detection of breast cancer
Electromagnetic coils form the basis of magnetic particle imaging (MPI) scanners. Previous scanner designs employ Helmholtz coil arrangement which has low sensitivity and high cost of fabrication. Furthermore, the scanners have long signal acquisition time and high memory requirement. This research …
-
Unsteady blood flow in the stenosed artery subjected to magnetic field and injected nanoparticles
The blood flow in the stenosed artery was investigated in the current work. The blood, which was modelled as Newtonian or non-Newtonian fluid, was subjected to an oscillating pressure gradient and a periodic body acceleration. In the first problem, the magnetic field and the porosity were …
-
The application of laser measurement techniques to the pneumatic transport of fine particles
The application of laser anemometry techniques to the measurement of local velocities and turbulence intensities is now well established for gas and liquid flows. In these situations, light from a low powered laser is scattered by seeding particles in the fluid which are small enough to follow the …
-
Photocalorimetry: design, development and test considerations
The goal of the project is to design and build a photocalorimeter capable of carrying out photostability testing in the pharmaceutical industry. A current challenge is to develop methods of testing the photostability of solid materials which are non-invasive, non-destructive and allow real time …
-
Detection and characterisation of secondary relaxations in solids using thermally stimulated current spectroscopy
Thermally stimulated current (TSC) spectroscopy has been used, in these reported investigations, as an innovative experimental technique for the detection and characterisation of secondary relaxation phenomena in the crystalline state for a number of low-molecular weight organic materials (LOMs), …
-
Understanding correlations between secondary relaxations and thermal behaviour of biologically relevant molecules
The research presented in this doctoral thesis examines the application of thermally stimulated depolarisation current (TSDC) spectroscopy as a probe of molecular mobility in the solid (powdered) state. TSDC spectroscopy has proved useful in understanding the molecular mobility of amorphous …
-
Use of soft computing pattern recognition techniques to analyse tropical cyclones from meteorological satellite data
Tropical cyclones are potentially the most destructive of all natural meteorological hazards. When these cloud systems make landfall, they cause significant amounts of human death and injury as well as extensive damage to property, therefore reliable cyclone detection and classification form …
-
Modelling and CFD simulation of a fluidized bed process for the capture of C02 from fossil fuel combustion sources
Fossil fuels provide the main source of energy for power generation in existing power plants. A mitigation option to reduce carbon dioxide (CO2) emission from existing power plants with fossil fuel combustion is the sequestration of carbon dioxide and storage in geological formations, in the ocean …
-
The measurement of the velocities of particles in an air-solid flow
Theoretical investigations of two-phase flows have not so far produced a useful model since the interdependence of the many variables has been difficult to predict. Progress towards such a model is dependent on accurate experimental work on two-phase flows. Particle velocity is an especially …
-
A study of the modes of gas-solids flow in pipelines
A variety of gas-solids flows can be observed in the pipeline of a pneumatic conveying system. These flows may be classified as one of three modes: i. suspension flow; ii. non-suspension moving-bed type flow; iii. non-suspension plug type flow. The modes of flow that a bulk material can achieve are …
-
Reversible electrical breakdown in amorphous chalcogenides
An investigation has been made of reversible electrical breakdown in amorphous chalcogenides with particular attention being paid to the on-state properties of Si12 Te48As30Ge10 glass threshold switches. Apparatus is described for the preparation of well-characterised materials and flash-evaporated …
-
Fully coupled CEM/CFD modelling of microwave heating in a porous medium
Computational results for the microwave heating of a porous material are presented in this paper. Coupled finite difference time domain and finite volume methods are used to solve equations that describe the electromagnetic field and heat and mass transfer in porous media. These equations are …
-
Thermoelectric magnetohydrodynamics in dendritic solidification
The focus of this work is to investigate the effects of applying an external magnetic field to a solidifying liquid metal melt. The principle is that thermoelectric currents that are naturally inherent to solidification processes will interact with this magnetic field, resulting in a Lorentz force. …
-
Modelling of the liquid slag behaviour in the continuous casting mould
… making use of the unstructured mesh multi-physics finite volume code PHYSICA [1]. As stated, the main goal of this particular work has to do with the study of the dynamic behaviour of the steel/slag interface, including the effects of casting speed and injected gas. Because of the great …
-
Investigation of the suitability of amorphous semiconductors as sensors for optical process tomography
In this work, the suitability of amorphous semiconductors as hard field optical sensors for application in optical process tomography (OPT) has been established. Two amorphous semiconductors were selected for the study, these being amorphous arsenic triselenide (a-As 2 Se3) and hydrogenated …
-
Studies of luminescent materials including novel preparation of phosphors
New, clean, methods of zinc sulphide synthesis were established in order to produce small regular particles with comparable luminescence to that of commercial standards in current use. These new methods are optimised for activator and co-activator concentrations, firing conditions and other factors …
-
Surface enhanced resonance Raman spectroscopy of dyes: semi-quantitative trace analysis
Herein analysis of dye molecules has been carried out by means of surface enhanced Raman spectroscopy (SERS) and/or surface enhanced resonance Raman spectroscopy (SERRS) using citrate- and/or borohydride-reduced silver colloids employing laser exciting wavelengths equal to 514.5 and/or 632.8 nm. …
Page 1 of 13