African University of Science and Technology: Recent submissions
Now showing items 941-960 of 4810
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A continuous/discontinuous Galerkin formulation for a strain gradient-dependent damage model
(4th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS)4th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS), 2004)The numerical solution of strain gradient-dependent continuum problems has been hindered by continuity demands on the basis functions. The presence of terms in constitutive models that involve gradients of the strain field ...
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Formulation of continuous/discontinuous Galerkin methods for strain gradient-dependent damage
(Strength Fracture and ComplexityStrength Fracture and Complexity, 2006)Continuum damage models are widely used to represent the development of microscopic defects that coalesce into a macroscopic crack. The microscopic defects cause a progressive weakening or softening of the material (damage). ...
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Automated modelling of viscoelastic flow using FEniCS
(XVI Convegno Italiano di Meccanica ComputazionaleXVI Convegno Italiano di Meccanica Computazionale, 2006)Using high-level abstractions, it is possible to efficiently automate the development of finite element models. This has advantages in terms of rapid development, a dramatic reduction in programming errors and offers the ...
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A study of discontinuous Galerkin methods for thin bending problems
(Computational Mechanics: Solids Structures and Coupled ProblemsComputational Mechanics: Solids Structures and Coupled Problems, 2006)Various continuous/discontinuous Galerkin formulations are examined for the analysis of thin plates. These methods rely on weak imposition of continuity of the normal slope across element boundaries. We draw here upon ...
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A $C^0$ discontinuous Galerkin formulation for thin shells
(2007)This paper presents a C 0 discontinuous Galerkin formulation for the simulation of thin shells. The method is based on Koiter’s shell model and allows finite element solutions to be obtained by using standard $C^0$ Lagrange ...
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Long-term behaviour of twin tunnels in London clay
(University of CambridgeDepartment of EngineeringCorpus Christi College, 2011-03-15)The assessment of ageing tunnels requires a deeper understanding of the long-term behaviour of twin tunnels, whilst lack of permeability data limits the accuracy of long-term predictions. This thesis therefore investigates ...
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Ultra-fast Imaging of Two-Phase Flow in Structured Monolith Reactors; Techniques and Data Analysis
(University of CambridgeDepartment of Chemical Engineering, 2007-03)This thesis will address the use of nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) techniques to probe the “monolith reactor”, which consists of a structured catalyst over which reactions may occur. ...
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The dynamic cutting of metals
(University of CambridgeEngineering Laboratory, 1962)Prediction of regenerative machine tool chatter requires a knowledge of the cutting forces existing under vibration conditions. Previous direct experimental work has been very limited in its range and has given results ...
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An interface element based on the partition of unity
(Delft University of Technology, 2001)An alternative interface finite element is developed. By using the partition of unity property of finite element shape functions, discontinuous shape functions are added to the standard finite element basis. The interface ...
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Bayesian methods in music modelling
(University of CambridgeDepartment of Engineering, 2011-03-15)This thesis presents several hierarchical generative Bayesian models of musical signals designed to improve the accuracy of existing multiple pitch detection systems and other musical signal processing applications whilst ...
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Cojumping: Evidence from the US Treasury Bond and Futures Market
(2011-02)The basis between spot and future prices will be affected by jump behavior in each asset price, challenging intraday hedging strategies. Using a formal cojumping test this paper considers the cojumping behaviour of spot ...
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The Term Premium and The UK Economy 1980-2007
(2010)The term premium is estimated from an empirically coherent open economy VAR model of the UK economy where the model specifically accounts for the mixed nature of the data and cointegration between some variables. Using ...
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Morale: definitions, dimensions and measurement
(University of CambridgeJudge Business School, 2010-04-13)Morale is a commonly used term both in business and society but the concept of morale is relatively poorly defined and understood. In a recent paper Liefooghe et al. (2004) expressed surprise that ‘…when reviewing the ...
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Generalised Bayesian matrix factorisation models
(University of CambridgeDepartment of EngineeringSt John's College, 2011-03-15)Factor analysis and related models for probabilistic matrix factorisation are of central importance to the unsupervised analysis of data, with a colourful history more than a century long. Probabilistic models for matrix ...
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Diamond Schottky barrier diodes
(University of Cambridge, 2008-03-11)Research on wide band gap semiconductors suitable for power electronic devices has spread rapidly in the last decade. The remarkable results exhibited by silicon carbide (SiC) Schottky batTier diodes (SBDs), commercially ...
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An empirical analysis of subprime consumer credit demand
(2010)We test the interest rate sensitivity of subprime credit card borrowers using a unique panel data set from a UK credit card company. What is novel about our contribution is that we were given details of a randomized interest ...
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Pedestrian localisation for indoor environments
(University of CambridgeFaculty of Computer Science and Technology, 2010-11-16)Ubiquitous computing systems aim to assist us as we go about our daily lives, whilst at the same time fading into the background so that we do not notice their presence. To do this they need to be able to sense their ...
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Water quality modeling for the Kennet and Avon Canal, a navigational canal in an inland catchment
(University of CambridgeDepartment of EngineeringSt. Catharine's College, 2010-10-12)The Kennet and Avon Canal in southern England is experiencing severe water quality problems caused by inorganic sediment and algae. These water quality problems are affecting the angling sport of fishermen downstream of ...
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Ground movements due to excavation in clay: physical and analytical models
(University of CambridgeDepartment of Engineering, 2010-11-16)In view of the recent catastrophes associated with deep excavations, there is an urgent need to provide vital guidelines on the design of the construction process. To develop a simple tool for predicting ground deformation ...
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Second-generation high-temperature superconducting coils and their applications for energy storage
(University of CambridgeDepartment of Engineering, 2010-11-16)Since a superconductor has no resistance below a certain temperature and can therefore save a large amount of energy dissipated, it is a 'green' material by saving energy loss and hence reducing carbon emissions. Recently ...
