Department of Materials Science and Metallurgy: Recent submissions
Now showing items 121-140 of 648
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Bivariate spatial point patterns in the retina: a reproducible review
(Societe Française de StatistiqueJournal de la Société Française de Statistique, 2016-04-08)In this article I present a reproducible review of recent research to investigate the spatial positioning of neurons in the nervous system. In particular, I focus on the relative spatial positioning of pairs of cell types ...
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Entrainment by turbulent fountains
(Cambridge University PressJournal of Fluid Mechanics, 2016-02-04)Experimental measurements of entrainment by turbulent fountains from circular sources in quiescent uniform environments are presented. Our results span almost four orders of magnitude in the source Froude number (0.004 ≤ ...
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Atomic Processes for Astrophysical Plasmas
(Institute of PhysicsJournal of Physics B: Atomic, Molecular and Optical Physics, 2016)In this review we summarize the recent calculations and improvements of atomic data that we have carried out for the analysis of astrophysical spectroscopy within the Atomic Processes for Astrophysical Plasmas (APAP) ...
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The Complexity of Divisibility
(ElsevierLinear Algebra and its Applications, 2016-04-08)We address two sets of long-standing open questions in linear algebra and probability theory, from a computational complexity perspective: stochastic matrix divisibility, and divisibility and decomposability of probability ...
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Spontaneous scalarization with massive fields
(American Physical SocietyPhysical Review D, 2016-03-03)We study the effect of a mass term in the spontaneous scalarization of neutron stars, for a wide range of scalar field parameters and neutron star equations of state. Even though massless scalars have been the focus of ...
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Nonlinear tides in a homogeneous rotating planet or star: global simulations of the elliptical instability
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016)I present results from the first global hydrodynamical simulations of the elliptical instability in a tidally deformed gaseous planet (or star) with a free surface. The elliptical instability is potentially important for ...
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Small acoustically forced symmetric bodies in viscous fluids
(American Institute of PhysicsJournal of the Acoustical Society of America, 2016-03-03)The total force exerted on a small rigid body by an acoustic field in a viscous fluid is addressed analytically in the limit where the typical size of the particle is smaller than both the viscous diffusion length scale ...
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Optimal amount of entanglement to distinguish quantum states instantaneously
(American Physical SocietyPhysical Review A, 2015-11-30)We introduce an aspect of nonlocality which arises when the task of quantum states distinguishability is considered under local operations and shared entanglement in the absence of classical communication. We find the ...
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Standard model physics from an algebra?
(2015)This thesis constitutes a first attempt to derive aspects of standard model particle physics from little more than an algebra. Here, we argue that physical concepts such as particles, causality, and irreversible time may ...
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Bacterial Hydrodynamics
(Annual ReviewsAnnual Review of Fluid Mechanics, 2016)Bacteria predate plants and animals by billions of years. Today, they are the world’s smallest cells, yet they represent the bulk of the world’s biomass and the main reservoir of nutrients for higher organisms. Most bacteria ...
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Nonlinear tides in a homogeneous rotating planet or star: global modes and elliptical instability
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-03-28)We revisit the global modes and instabilities of homogeneous rotating ellipsoidal fluid masses, which are the simplest global models of rotationally and tidally deformed gaseous planets or stars. The tidal flow in a ...
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Nonlinear hydrodynamical evolution of eccentric Keplerian discs in two dimensions: validation of secular theory
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-03-11)We perform global two-dimensional hydrodynamical simulations of Keplerian discs with free eccentricity over thousands of orbital periods. Our aim is to determine the validity of secular theory in describing the evolution ...
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Generations: three prints, in colour
(SpringerJournal of High Energy Physics, 2014-10-07)We point out a somewhat mysterious appearance of SUc(3) representations, which exhibit the behaviour of three full generations of standard model particles. These representations are found in the Clifford algebra ℂl(6), ...
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Charge quantization from a number operator
(ElsevierPhysics Letters B, 2015-01-26)We explain how an unexpected algebraic structure, the division algebras, can be seen to underlie a generation of quarks and leptons. From this new vantage point, electrons and quarks are simply excitations from the neutrino, ...
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Obstructed and channelized viscoplastic flow in a Hele-Shaw cell
(Cambridge University PressJournal of Fluid Mechanics, 2016-02-02)A theoretical study is presented of the flow of viscoplastic fluid through a Hele-Shaw cell that contains various kinds of obstructions. Circular and elliptical blockages of the cell are considered together with stepwise ...
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Flow-induced compaction of a deformable porous medium
(American Physical SocietyPhysical Review E, 2016-02-24)Fluid flowing through a deformable porous medium imparts viscous drag on the solid matrix, causing it to deform. This effect is investigated theoretically and experimentally in a one-dimensional configuration. The experiments ...
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The stress–pressure relationship in simulations of MRI-induced turbulence
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-01-01)We determine how MRI (magnetorotational instability)-turbulent stresses depend on gas pressure via a suite of unstratified shearing box simulations. Earlier numerical work reported only a very weak dependence at best, ...
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Destruction of large-scale magnetic field in nonlinear simulations of the shear dynamo
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-03-03)The Sun's magnetic field exhibits coherence in space and time on much larger scales than the turbulent convection that ultimately powers the dynamo. In the past the α-effect (mean-field) concept has been used to model the ...
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On the convective overstability in protoplanetary discs
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-01-21)This paper explores the driving of low-level hydrodynamical activity in protoplanetary-disc dead zones. A small adverse radial entropy gradient, ordinarily stabilized by rotation, excites oscillatory convection (‘convective ...
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R-Parity Violation in a Warped GUT Scale Randall-Sundrum Framework
(American Physical SocietyPhysical Review D, 2016)We consider a modified Randall-Sundrum (RS) framework between the Planck scale and the GUT scale. In this scenario, RS works as a theory of flavour and not as a solution to the hierarchy problem. The latter is resolved by ...