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 30 for “"material characterisation"”.
-
Application of scanning micro-tip and UHV Kelvin probes in surface and material characterisation.
… probe to optimise high and low work function materials for hyperthermal surface ionisation (HSI), a new mass spectrometer technique that reduces ion fragmentation.
-
Redefining Egyptian “pastes”: material characterisation and technological developments in Third Intermediate Period coffin sets from Thebes
… of their surfaces. However, the construction materials of coffins, often collectively referred to as “pastes,” have received relatively little scholarly attention. These materials may encompass plasters but also gypsum or crushed limestone bound with organic media, sometimes incorporating clay …
-
Extending the annular in-plane torsional shear test specimen to applications at high strain rates
… test is a well-established test used for the characterisation of sheet metals. The specimen is intended to deform in planar simple shear and is designed to be machined with a continuous annular shear zone. As a result, there are no “edge effects” or geometric discontinuities to generate …
-
Hot embossing of polymeric tubular micro-components
… by: 1) FE simulations using data obtained from material characterisation tests and 2) forming experiments and quality assessment of the formed components. Formability of more than ten types of polymeric micro-tubes were determined and their failure forms discussed. Furthermore, three forming …
-
Graphite-enabled Cementitious Composites: A Smart and Resilient Solution for Future Infrastructure
Concrete, as the most widely used construction material on Earth, is one of Earth’s most versatile, strong, and affordable materials. However, concrete infrastructure tends to degrade with extended service life due to environmental and mechanical impacts. Carbon-based materials have been …
-
A Study of Heat Transfer at the Cavity-Polymer Interface in Microinjection Moulding. The effects of processing conditions, cavity surface roughness and polymer physical properties on the heat transfer coefficient
… experimental mould design and manufacturing, material characterisation, infra-red temperature measurements, cooling analysis and cooling prediction using commercial simulation software. To measure surface temperature of the polymers, compounding of polypropylene and polystyrene with carbon …
-
Fabrication of novel functional anisotropic micro-particles for foam stabilisation and structuring in food formulations
… which were applied as a foam scaffolding material. Characterisation and modification of Nata de Coco nano-rods was also carried out. It was found that cellulose nano-rods modified with a surface layer of ethyl cellulose exhibited good foamability.Secondly, a combination of in-shear-flow …
-
Novel mesoporous silicates as indoor air pollutant scavengers
… surface area, pore size and pore volume of the material. Several preparation methods were used to produce the final mesoporous silicate sorbent. The mesoporous silicates were mainly synthesised using tetraethyl orthosilicate as a precursor with either a quaternary ammonia silicate or triblock …
-
Exploring the application of instrumental analysis for the conservation of textiles excavated in Greece
… and XRF spectroscopy, with the aim of material characterisation and<br/>identification. A survey through the Archives of the Hellenic Ministry of Culture revealed 65<br/>different cases where textiles had been preserved in burial contexts. Four different environments<br/>favorable for …
-
Design and Performance of Reinforced Concrete Elements with Spatial Tailoring of Concrete Properties
… requirements to make more efficient use of materials and thereby reduce the environmental impact of reinforced concrete elements. By layering in the fresh-state, hydration occurs across the interfaces between concrete layers and composite behaviour is expected. This research quantifies the …
-
Dynamic stiffness and damping prediction on rubber material parts, FEA and experimental correlation
… necessary to perform a complex rubber compound material characterisation and modelling work; this needs two important previous steps. These steps are detailed in the present document together with a theoretical review of viscoelastic visco-elasto-plastic models for elastomers. Firstly, a new …
-
Investigation of die wear by modelling the extrusion of Inconel 718
… to it must be identified and quantified. First, material characterisation was carried out using the Gleeble physical materials simulator. Then a set of unified viscoplastic constitutive equations was developed suitable for modelling microstructural evolution of IN718, i.e. evolution of average …
-
Structural and Vibration Analysis of Polymeric Functionally Graded Plates
Functionally graded materials (FGMs) are advanced engineered materials whereby material composition and properties vary spatially in the macroscopic length scale. Accurate analytical and numerical models for prediction of mechanical behaviour and damage of the FG plate are required as their …
-
Validation of photoacoustic imaging biomarkers in cancer biology
… First, the current state-of-the art phantom materials in biophotonics are surveyed and general design considerations for preparation of tissue-mimicking phantoms are discussed to guide the development of a stable phantom material in PAI. Acoustic and optical material characterisation systems …
-
Synthesis of Nanocrystal Quantum Dots with Enhanced Photoluminescence for Luminescent Optoelectronics
… in detail, also applicable to other luminescent materials. Additionally, alternative applications for luminescent quantum dots have been investigated, and finally, the gap between small-scale synthesis and industrial production was explored for the material system of most interest. PbS quantum …
-
Changes in material characteristics of AISI 430 stainless steel plates subjected to repeated blast loading
… the mechanical properties and performance of the material. Therefore, understanding the effect of high strain rate loadings on the microstructural evolution and subsequent mechanical properties of metals and alloys is necessary for mechanical design. The main objective of this research was to …
-
Laser manufacturing of multi-functional and antibacterial surfaces for orthopaedic applications
… Ti or medical grade 2), which is a commonly used material in medical devices has been shown to improve response to bacteria attempting to attach to the surface2. The aim of this work was to investigate how laser treatment in an open-air environment made changes to the surface of cp Ti, the …
-
Numerical Modelling of Steel Fibre Reinforced Concrete Subjected to Fatigue Loading
… Concrete Damage Plasticity (CDP) model. Material characterisation tests were conducted to determine the parameters required for the constitutive formulations, while experimental fatigue data from Fataar (2022) were used for validation. The SFRC material was classified as 5d in accordance …
-
Electrochemical materials and microfabrication for sensor devices
… Their design is also highly adaptable: electrode materials, size, surface modifications, and enzyme integration can be tailored to optimise detection for specific applications. This thesis presents the fabrication and optimisation of nanoporous copper (NPC) electrodes across macro- and micro-scale …
-
Experimental and Computational Modelling of Tissue Rheology and Mechanics in Morphogenesis
… mechanical parameters interact with tissue material properties and active cell behaviour to drive tissue deformation in the context of biological development. Firstly, an experimental, three-dimensional tissue model is presented, which consists of giant unilamellar vesicles decorated with …
Page 1 of 2