Paul D. Ledger
YOU?
Author Swipe
View article: High-fidelity modelling of floor-borne vibrations in axisymmetric MRI magnets using <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si95.svg"><mml:mrow><mml:mi>h</mml:mi><mml:mi>p</mml:mi></mml:mrow></mml:math>-finite element method
High-fidelity modelling of floor-borne vibrations in axisymmetric MRI magnets using -finite element method Open
View article: Characterising buried objects in metal detection
Characterising buried objects in metal detection Open
Current mathematical models for identifying highly conducting buried objects in metal detection assume that the soil is non-conducting and has the same permeability as free space. However, although the electrical conductivity of soil is lo…
View article: An application of hp-version finite element methods to quench simulation in axisymmetric MRI magnets
An application of hp-version finite element methods to quench simulation in axisymmetric MRI magnets Open
Magnetic Resonance Imaging (MRI) scanners employ superconducting magnets to produce a strong uniform magnetic field over the bore of the scanner as part of the imaging process. Superconductors are preferred, as they can generate the requir…
View article: How far are two symmetric matrices from commuting? With an application to object characterisation and identification in metal detection
How far are two symmetric matrices from commuting? With an application to object characterisation and identification in metal detection Open
Examining the extent to which measurements of rotation matrices are close to each other is challenging due measurement noise. To overcome this, data is typically smoothed and Riemannian and Euclidean metrics are applied. However, if rotati…
View article: Towards simulation of magnet quench using hp-FEM
Towards simulation of magnet quench using hp-FEM Open
Magnetic Resonance Imaging (MRI) scanners rely on superconducting magnets consisting of coils of superconducting material to produce a strong magnetic field across the bore of the magnet as part of the imaging process. To maintain supercon…
View article: Reduced order modelling using neural networks for predictive modelling of 3d-magneto-mechanical problems with application to magnetic resonance imaging scanners
Reduced order modelling using neural networks for predictive modelling of 3d-magneto-mechanical problems with application to magnetic resonance imaging scanners Open
The design of magnets for magnetic resonance imaging (MRI) scanners requires the numerical simulation of a coupled magneto-mechanical system where the effects that different material parameters and in-service loading conditions have on bot…
View article: Characterising small objects in the regime between the eddy current model and wave propagation
Characterising small objects in the regime between the eddy current model and wave propagation Open
Being able to characterise objects at low frequencies, but in situations where the modelling error in the eddy current approximation of the Maxwell system becomes large, is important for improving current metal detection technologies. Impo…
View article: Reduced order model approaches for predicting the magnetic polarizability tensor for multiple parameters of interest
Reduced order model approaches for predicting the magnetic polarizability tensor for multiple parameters of interest Open
View article: Dataset for the article "Computations and Measurements of the Magnetic Polarizability Tensor Characterisation of Highly Conducting and Magnetic Objects"
Dataset for the article "Computations and Measurements of the Magnetic Polarizability Tensor Characterisation of Highly Conducting and Magnetic Objects" Open
Datasets to accompany the article "Computations and Measurements of the Magnetic Polarizability Tensor Characterisation of Highly Conducting and Magnetic Objects". Written by J. Elgy, P. D. Ledger, J. L. Davidson, T. Özdeğer and A. J. Peyt…
View article: Dataset for the article "Computations and Measurements of the Magnetic Polarizability Tensor Characterisation of Highly Conducting and Magnetic Objects"
Dataset for the article "Computations and Measurements of the Magnetic Polarizability Tensor Characterisation of Highly Conducting and Magnetic Objects" Open
Datasets to accompany the article "Computations and Measurements of the Magnetic Polarizability Tensor Characterisation of Highly Conducting and Magnetic Objects". Written by J. Elgy, P. D. Ledger, J. L. Davidson, T. Özdeğer and A. J. Peyt…
View article: Efficient Computation of Magnetic Polarizability Tensor Spectral Signatures for Object Characterisation in Metal Detection
Efficient Computation of Magnetic Polarizability Tensor Spectral Signatures for Object Characterisation in Metal Detection Open
Purpose: Magnetic polarizability tensors (MPTs) provide an economical characterisation of conducting magnetic metallic objects and their spectral signature can aid in the solution of metal detection inverse problems, such as scrap metal so…
View article: Dataset for the article "Reduced order model approaches for predicting the magnetic polarizability tensor for multiple parameters of interest"
Dataset for the article "Reduced order model approaches for predicting the magnetic polarizability tensor for multiple parameters of interest" Open
Datasets to accompany the article "Reduced order model approaches for predicting the magnetic polarizability tensor for multiple parameters of interest". Written by J. Elgy and P. D. Ledger (Keele University, 2023). The datasets include da…
View article: Dataset for the article "Reduced order model approaches for predicting the magnetic polarizability tensor for multiple parameters of interest"
Dataset for the article "Reduced order model approaches for predicting the magnetic polarizability tensor for multiple parameters of interest" Open
Datasets to accompany the article "Reduced order model approaches for predicting the magnetic polarizability tensor for multiple parameters of interest". Written by J. Elgy and P. D. Ledger (Keele University, 2023). The datasets include da…
View article: Effect of Scanning Acceleration on the Leakage Signal in Magnetic Flux Leakage Type of Non-destructive Testing
Effect of Scanning Acceleration on the Leakage Signal in Magnetic Flux Leakage Type of Non-destructive Testing Open
View article: Minimal Object Characterizations Using Harmonic Generalized Polarizability Tensors and Symmetry Groups
Minimal Object Characterizations Using Harmonic Generalized Polarizability Tensors and Symmetry Groups Open
We introduce a new type of object characterisation, which is capable of accurately describing small iso�lated inclusions for potential field inverse problems such as in electrostatics, magnetostatics and related
\nlow frequency Maxwell pro…
View article: Properties of generalized magnetic polarizability tensors
Properties of generalized magnetic polarizability tensors Open
We present new alternative complete asymptotic expansions for the time harmonic low‐frequency magnetic field perturbation caused by the presence of a conducting permeable object as its size tends to zero for the eddy current approximation …
View article: Transient changes during microwave ablation simulation : a comparative shape analysis
Transient changes during microwave ablation simulation : a comparative shape analysis Open
Microwave ablation therapy is a hyperthermic treatment for killing cancerous tumours whereby microwave energy is dispersed into a target tissue region. Modelling can provide a prediction for the outcome of ablation, this paper explores cha…
View article: Characterising small objects in the regime between the eddy current model and wave propagation
Characterising small objects in the regime between the eddy current model and wave propagation Open
Being able to characterise objects at low frequencies, but above the limiting frequency of the eddy current approximation of the Maxwell system, is important for improving current metal detection technologies. Importantly, the upper freque…
View article: Properties of Generalised Magnetic Polarizability Tensors
Properties of Generalised Magnetic Polarizability Tensors Open
We present new alternative complete asymptotic expansions for the time harmonic low--frequency magnetic field perturbation caused by the presence of a conducting permeable object as its size tends to zero for the eddy current approximation…
View article: Benchmark computations for the polarization tensor characterization of small conducting objects
Benchmark computations for the polarization tensor characterization of small conducting objects Open
The characterisation of small low conducting inclusions in an otherwise uniform background from low-frequency electrical field measurements has important applications in medical imaging using electrical impedance tomography as well as in g…
View article: Identification of metallic objects using spectral magnetic polarizability tensor signatures: Object classification
Identification of metallic objects using spectral magnetic polarizability tensor signatures: Object classification Open
The early detection of terrorist threat objects, such as guns and knives, through improved metal detection, has the potential to reduce the number of attacks and improve public safety and security. To achieve this, there is considerable po…
View article: Minimal Object Characterisations using Harmonic Generalised Polarizability Tensors and Symmetry Groups
Minimal Object Characterisations using Harmonic Generalised Polarizability Tensors and Symmetry Groups Open
We introduce a new type of object characterisation, which is capable of accurately describing small isolated inclusions for potential field inverse problems such as in electrostatics, magnetostatics and related low frequency Maxwell proble…
View article: Measurement of GMPT Coefficients for Improved Object Characterisation in Metal Detection
Measurement of GMPT Coefficients for Improved Object Characterisation in Metal Detection Open
Magnetic polarizability tensors (MPTs) have become popular for characterising conducting permeable objects and assisting with the identification of hidden objects in metal detection for applications in security screening, humanitarian demi…
View article: Data set for the article "Accurate Benchmark Polarizability Tensor Characterisations of Small Conducting Inclusions"
Data set for the article "Accurate Benchmark Polarizability Tensor Characterisations of Small Conducting Inclusions" Open
Data set to accompany the article "Accurate Benchmark Polarizability Tensor Characterisations of Small Conducting Inclusions". Abstract: The characterisation of small low conducting inclusions in an otherwise uniform background from low-fr…
View article: Identification of Metallic Objects using Spectral Magnetic Polarizability Tensor Signatures: Object Classification
Identification of Metallic Objects using Spectral Magnetic Polarizability Tensor Signatures: Object Classification Open
The early detection of terrorist threat objects, such as guns and knives, through improved metal detection, has the potential to reduce the number of attacks and improve public safety and security. To achieve this, there is considerable po…
View article: Benchmark computations for the polarization tensor of small conducting objects
Benchmark computations for the polarization tensor of small conducting objects Open
The characterisation of small low conducting inclusions in an otherwise uniform background from low-frequency electrical field measurements has important applications in medical imaging using electrical impedance tomography as well as in g…
View article: Accurate Benchmark Computations of the Polarizability Tensor for Characterising Small Conducting Inclusions.
Accurate Benchmark Computations of the Polarizability Tensor for Characterising Small Conducting Inclusions. Open
The characterisation of small conducting inclusions with low conductivities in an otherwise uniform background from low-frequency electrical field measurements has important applications in medical imaging using electrical impedance tomogr…
View article: Identification of metallic objects using spectral magnetic polarizability tensor signatures: Object characterisation and invariants
Identification of metallic objects using spectral magnetic polarizability tensor signatures: Object characterisation and invariants Open
The early detection of terrorist threat objects, such as guns and knives, through improved metal detection, has the potential to reduce the number of attacks and improve public safety and security. To achieve this, there is considerable po…
View article: Data set for the article "Identification of Metallic Objects using Spectral MPT Signatures: Object Characterisation and Invariants"
Data set for the article "Identification of Metallic Objects using Spectral MPT Signatures: Object Characterisation and Invariants" Open
Data set to accompany the article "Identification of Metallic Objects using Spectral MPT Signatures: Object Characterisation and Invariants" written by P.D. Ledger (Keele University), B.A. Wilson (Swansea University), A.A.S. Amad (Swansea …
View article: Data set for the article "Identification of Metallic Objects using Spectral MPT Signatures: Object Characterisation and Invariants"
Data set for the article "Identification of Metallic Objects using Spectral MPT Signatures: Object Characterisation and Invariants" Open
Data set to accompany the article "Identification of Metallic Objects using Spectral MPT Signatures: Object Characterisation and Invariants" written by P.D. Ledger (Keele University), B.A. Wilson (Swansea University), A.A.S. Amad (Swansea …