Department of Materials Science and Metallurgy: Recent submissions
Now showing items 101-120 of 648
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On generalized dispersion relations and meson-nucleon scattering
(University of CambridgeFaculty of MathematicsTrinity College, 1957-11-19)
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The power spectrum and bispectrum of inflation and cosmic defects
(University of CambridgeDepartment of Applied Mathematics and Theoretical PhysicsGonville and Caius College, 2016-06-28)Much of the recent progress in cosmology has come from studying the power spectrum of the cosmic microwave background (CMB). The latest results from the Planck satellite confirmed that the inflationary paradigm with the ...
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Numerical solution of Sturm–Liouville problems via Fer streamers
(University of CambridgeDepartment of Applied Mathematics and Theoretical PhysicsHomerton College, 2016-06-28)The subject matter of this dissertation is the design, analysis and practical implementation of a new numerical method to approximate the eigenvalues and eigenfunctions of regular Sturm–Liouville problems, given in Liouville’s ...
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The geometry and representation theory of superconformal quantum mechanics
(University of CambridgeDepartment of Applied Mathematics and Theoretical PhysicsJesus College, 2016-06-28)We study aspects of the quantum mechanics of nonlinear $\sigma$-models with superconformal invariance. The connection between the differential geometry of the target manifold and symmetries of the quantum mechanics is ...
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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 ...
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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 ...
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Secure quantum signatures using insecure quantum channels
(American Physical SocietyPhysical Review A, 2016-03-17)Digital signatures are widely used in modern communication to guarantee authenticity and transferability of messages. The security of currently used classical schemes relies on computational assumptions. We present a quantum ...
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Electromagnetic transition strengths for light nuclei in the Skyrme model
(American Physical SocietyPhysical Review C, 2016-03-07)We calculate reduced B(E2) electromagnetic transition strengths for light nuclei of mass numbers B = 8,12,16,20,24, and 32 within the Skyrme model. We find that the predicted transition strengths are of the correct order ...
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Numerical study of the unitary Fermi gas across the superfluid transition
(American Physical SocietyPhysical Review A, 2016)We present results from Monte Carlo calculations investigating the properties of the homogeneous, spin-balanced unitary Fermi gas in three dimensions. The temperature is varied across the superfluid transition allowing us ...
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Entropy power inequalities for qudits
(American Institute of Physics PublishingJournal of Mathematical Physics, 2016-05-20)Shannon’s entropy power inequality (EPI) can be viewed as a statement of concavity of an entropic function of a continuous random variable under a scaled addition rule: f(√a X + √1 − a Y) ≥ a f(X) + (1 − a)f(Y) ∀ a ∈ [0, ...
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Acoustic boundary conditions at an impedance lining in inviscid shear flow
(Cambridge University PressJournal of Fluid Mechanics, 2016)The accuracy of existing impedance boundary conditions is investigated, and new impedance boundary conditions are derived, for lined ducts with inviscid shear flow. The accuracy of the Ingard–Myers boundary condition is ...
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Coordinated Beating of Algal Flagella is Mediated by Basal Coupling
(National Academy of SciencesProceedings of the National Academy of Sciences (PNAS), 2016)Cilia and flagella often exhibit synchronized behavior; this includes phase-locking, as seen in Chlamydomonas, and metachronal wave formation in the respiratory cilia of higher organisms. Since the observations by Gray and ...
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Lecture notes: Astrophysical fluid dynamics
(Cambridge University PressJournal of Plasma Physics, 2016)These lecture notes and example problems are based on a course given at the University of Cambridge in Part III of the Mathematical Tripos. Fluid dynamics is involved in a very wide range of astrophysical phenomena, ...
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The formation and evolution of reconnection-driven, slow-mode shocks in a partially ionised plasma
(EDP SciencesAstronomy & Astrophysics, 2016)The role of slow-mode magnetohydrodynamic (MHD) shocks in magnetic reconnection is of great importance for energy conversion and transport, but in many astrophysical plasmas the plasma is not fully ionised. In this paper, ...
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The fluxes and behaviour of plumes inferred from measurements of coherent structures within images of the bulk flow
(Taylor & FrancisAtmosphere - Ocean, 2016-06-01)This paper describes how measurements of the movement of identifiable features at the edge of a turbulent plume can be interpreted to determine the properties of the mean flow and consequently, using plume theory, can be ...
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Asymptotic Analysis of Asymmetric Thin Sheet Rolling
(ElsevierInternational Journal of Mechanical Sciences, 2016-04-22)An analytical model for asymmetric rolling is presented, which includes asymmetry in roll friction, roll size and roll speed, for a rigid, perfectly-plastic thin sheet deformed with Coulomb friction. This model is solved ...
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Consequences of tidal interaction between disks and orbiting protoplanets for the evolution of multi-planet systems with architecture resembling that of Kepler 444
(SpringerCelestial Mechanics and Dynamical Astronomy, 2016)We study orbital evolution of multi-planet systems with masses in the terrestrial planet regime induced through tidal interaction with a protoplanetary disk assuming that this is the dominant mechanism for producing orbital ...