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.
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Showing 1 to 20 of 715 for “"Fibres"”.
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Symplectic properties of Milnor fibres
… to the symplectic geometry of the Milnor fibres of isolated affine hypersurface singularities. First, given two Lagrangian spheres in an exact symplectic manifold, we find conditions under which the Dehn twists about them generate a free non-abelian subgroup of the symplectic mapping class …
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Fabrication and applications of fluorescent polymer fibres
… a top plate. This method was found to produce fibres with greatly increased order parameters compared to those from a flat collection plate. Narrower gaps between the plates resulted in higher order parameters due to increased anisotropy in the transverse electric field. A custom substrate was …
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Acoustical characteristics of oil palm mesocarp fibres
Natural fibres are availability biomass, plentiful in agricultural waste and eco�friendly materials. Currently, it is become the major reasons for emerging renewable materials in sustainable technology. Therefore, this study discusses the acoustical characteristics of agro-waste biomass fibres from …
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Characterisation of environmentally friendly fibres for composites
… as a favoured matrix material with different fibres being used as reinforcement in automotive composites. One of the most popular fibres for reinforcing PP matrix is Glass fibre (GF) due to its strength and impact resistance. More recently there has been interest expressed in further reducing …
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Holey optical fibres for high nonlinearity devices
… to produce such a fibre is discussed, and the fibres produced are characterized and used in device applications, proving the advantages of HF technology in the implementation of highly nonlinear optical devices, as well as showing its limitations. The initial fabrication problems that hindered …
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Optical frequency comb generation in optical fibres
… This approach consists of three optical fibres that are fed by two equally intense continuous-wave (CW) lasers. The first fibre is a conventional single-mode fibre, the second one is a suitably pumped amplifying Erbium-doped fibre with anomalous dispersion, and the third one is a …
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Reconstituted collagen fibres for tissue engineering applications
… native fibrils. Recently, reconstituted collagen fibres have been of interest. Due to their unique advantageous properties, such as high surface area, softness, absorbency and ease of fabrication into many product forms, biomaterial based on reformed collagen fibres have been used as a substrate …
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Finite element modelling of photonic crystal fibres
… to polarization maintaining Panda or Bow-tie fibres. This research also aims to investigate the modal leakage losses of PCF, by using a semi-vectorial beam propagation method (BPM) based on the versatile FEM. The robust perfectly matched layer (PML) boundary condition has been introduced to …
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Finite element characterisation of photonic crystal fibres
… bending and leakage losses of Photonic Crystal Fibres (PCF). A modal solution approach including the implementations of the conformal transformation and the Perfectly Matched Layer (PML) were undertaken to determine the bending and leakage losses of several designs of Photonic Crystal Fibres. …
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Glulam beams strengthened with pre-stressed basalt fibres
… elasticity. To study the effect of gluing basalt fibres on the tension zone of glulam beams an experiment was conducted in the structural laboratory (Sel) of Reykjavik University. 12 glulam beams 3,2 m long, 65 mm wide and 167 mm high in strength class GL30c were randomly divided into 3 groups …
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Dynamics of semi-flexible fibres in viscous flow
The dynamics of semi-flexible fibres in shear flow and the effect of flexibility on the swimming speed of helical flagella are investigated. High aspect ratio particles such as carbon and glass fibres are often added as fillers to processed polymers. Although these materials have high rigidity, the …
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Bending losses in large mode area holey fibres
… predicting bend loss in arbitrary index fibres, to use these techniques to explore the potential offered by holey fibres in the large-mode-area, single-mode regime, and to place their performance in context against conventional step-index fibres. In the study presented here, numerical and …
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Direct and inverse design of microstructured optical fibres
Microstructured optical fibres, where an arrangement of air holes running longitudinally along the fibre guides light in either a solid or a hollow core, have created new opportunities in diverse areas of science and technology. Applications range from the generation of supercontinuum light to …
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Surface characterisation of modified pan based carbon fibres.
… (PAN) based high strength (HT) carbon fibres modified by electrochemical and ultra-violet ozone (UV/O3) treatment methods. The surface and bulk study was conducted by x-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. …
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Lagrangian modelling of nonlinear waves in optical fibres
The Lagrangian perturbation method for the NLS is revisited in the form of an equivalent direct problem. The analogy can be extended to arbitrarily perturbed systems. It is then possible to provide first order perturbation expansions for the fundamental soliton. The case of the damped NLS is …
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High Resolution Distributed Sensing Using Exposed-Core Fibres
Distributed fibre sensors were proposed more than 40 years ago, with their primary applications in physical sensing for civil infrastructure monitoring. Based on optical frequency domain reflectometry (OFDR), this thesis extends distributed sensing to biomedical applications, with a focus on the …
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Novel diesel particulate filters containing fine ceramic fibres
… through the introduction of fine ceramic fibres. Filtration efficiency is considered by experimental measurement of porosity and permeability. Porosity of the material is shown to increase with fibre content, providing a larger volume for soot collection. The permeability is shown to …
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