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First-order gradient regularisation methods for image restoration: reconstruction of tomographic images with thin structures and denoising piecewise affine images
(University of CambridgeDepartment of Applied Mathematics and Theoretical PhysicsCentre for Mathematical SciencesJesus College, 2016-02-02)
The focus of this thesis is variational image restoration techniques that involve novel non-smooth first-order gradient regularisers: Total Variation (TV) regularisation in image and data space for reconstruction of thin ...
PET Reconstruction with an Anatomical MRI Prior using Parallel Level Sets
(IEEEIEEE Transactions on Medical Imaging, 2016-04-14)
The combination of positron emission tomography (PET) and magnetic resonance imaging (MRI) offers unique possibilities. In this paper we aim to exploit the high spatial resolution of MRI to enhance the reconstruction of ...
Ferromagnetic and antiferromagnetic order in bacterial vortex lattices
(Nature Publishing GroupNature Physics, 2016-01-04)
Despite their inherently non-equilibrium nature [1] , living systems can self-organize in highly ordered collective states [2,3] that share striking similarities with the thermodynamic equilibrium phases [4,5] of conventional ...
Numerical simulations of stellar collapse in scalar-tensor theories of gravity
(Institute of PhysicsClassical and Quantum Gravity, 2016-05-31)
We present numerical-relativity simulations of spherically symmetric core collapse and compact-object formation in scalar-tensor theories of gravity. The additional scalar degree of freedom introduces a propagating monopole ...
Interaction of turbulence with the leading-edge stagnation point of a thin aerofoil
(Cambridge University PressJournal of Fluid Mechanics, 2016)
An asymptotic model is constructed to analyse the interaction of turbulence generated far upstream with a thin elliptic-nosed solid body in uniform flow. The leading-edge stagnation point causes significant deformation of ...
Nonresonant optical control of a spinor polariton condensate
(American Physical SocietyPhysical Review B, 2016)
We investigate the spin dynamics of polariton condensates spatially separated from and effectively confined by the pumping exciton reservoir. We obtain a strong correlation between the ellipticity of the non-resonant optical ...
Excited Heavy Mesons From Lattice QCD
(American Institute of Physics PublishingAIP Conference Proceedings, 2016-05-25)
I discuss some recent investigations of excited mesons using first-principles lattice QCD calculations. Over the last few years we have made significant advances in studying near-threshold states, resonances and related ...
Multi-Contrast MRI Reconstruction with Structure-Guided Total Variation
(Society for Industrial and Applied MathematicsSIAM Journal on Imaging Sciences, 2016-08-04)
Magnetic resonance imaging (MRI) is a versatile imaging technique that allows different contrasts depending on the acquisition parameters. Many clinical imaging studies acquire MRI data for more than one of these contrasts—such ...
Numerical simulations of stellar collapse in scalar-tensor theories of gravity
(Institute of PhysicsClassical and Quantum Gravity, 2016-05-31)
We present numerical-relativity simulations of spherically symmetric core collapse and compact-object formation in scalar-tensor theories of gravity. The additional scalar degree of freedom introduces a propagating monopole ...
On turbulence driven by axial precession and tidal evolution of the spin–orbit angle of close-in giant planets
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-05-16)
The spin axis of a rotationally deformed planet is forced to precess about its orbital angular momentum vector, due to the tidal gravity of its host star, if these directions are misaligned. This induces internal fluid ...