Cambridge University: Recent submissions

Now showing items 1021-1040 of 1268

  • Microscale flow dynamics of ribbons and sheets 

    Montenegro-Johnson, TD; Koens, Lyndon Mathijs; Lauga, Eric Jean-Marie (Royal Society of ChemistrySoft Matter, 2017-01-18)
    Numerical study of the hydrodynamics of thin sheets and ribbons presents difficulties associated with resolving multiple length scales. To circumvent these difficulties, asymptotic methods have been developed to describe ...

  • Teichmüller spaces and bounded symmetric domains do not mix isometrically 

    Antonakoudis, Stergios (SpringerGeometric and Functional Analysis, 2017-06-01)
    This paper shows that, in dimensions two or more, there are no holomorphic isometries between Teichüller spaces and bounded symmetric domains in their intrinsic Kobayashi metric.

  • Detrainment of plumes from vertically distributed sources 

    Bonnebaigt, Rachael; Caulfield, Colm-cille Patrick; Linden, Paul Frederick (SpringerEnvironmental Fluid Mechanics, 2016-11-22)
    We present experimental results demonstrating that, for the turbulent plume from a buoyancy source that is vertically distributed over the full area of a wall, detrainment qualitatively changes the shape of the ambient ...

  • Tautological rings for high-dimensional manifolds 

    Galatius, S; Grigoriev, I; Randal-Williams, Oscar (Cambridge University PressCompositio Mathematica, 2017-04)
    We study tautological rings for high-dimensional manifolds, that is, for each smooth manifold $M$ the ring $R^*$($M$) of those characteristic classes of smooth fibre bundles with fibre $M$ which is generated by generalised ...

  • Hydrodynamic interactions between nearby slender filaments 

    Man, Yi; Koens, Lyndon Mathijs; Lauga, Eric Jean-Marie (IOP PublishingEPL (Europhysics Letters), 2016-11-28)
    Cellular biology abound with filaments interacting through fluids, from intracellular microtubules, to rotating flagella and beating cilia. While previous work has demonstrated the complexity of capturing nonlocal hydrodynamic ...

  • On the Absence of Uniform Recovery in Many Real-World Applications of Compressed Sensing and the Restricted Isometry Property and Nullspace Property in Levels 

    Bastounis, Alexander; Hansen, Anders Christian (Society for Industrial and Applied MathematicsSiam Journal on Imaging Sciences, 2017-03-15)
    The purpose of this paper is twofold. The first is to point out that the property of uniform recovery, meaning that all sparse vectors are recovered, does not hold in many applications where compressed sensing is successfully ...

  • Pairwise Markov properties for regression graphs 

    Sadeghi, Kayvan; Wermuth, N (WileyStat, 2016-11-13)
    With a sequence of regressions, one may generate joint probability distributions. One starts with a joint, marginal distribution of context variables having possibly a concentration graph structure and continues with an ...

  • Mobility of an axisymmetric particle near an elastic interface 

    Daddi-Moussa-Ider, A; Lisicki, Maciej Krzysztof; Gekle, S (Cambridge University PressJournal of Fluid Mechanics, 2017-01-01)
    Using a fully analytical theory, we compute the leading-order corrections to the translational, rotational and translation–rotation coupling mobilities of an arbitrary axisymmetric particle immersed in a Newtonian fluid ...

  • Questioning the Mpemba effect: hot water does not cool more quickly than cold 

    Burridge, HC; Linden, Paul Frederick (Nature Publishing GroupScientific Reports, 2016-11-24)
    The Mpemba effect is the name given to the assertion that it is quicker to cool water to a given temperature when the initial temperature is higher. This assertion seems counter-intuitive and yet references to the effect ...

  • Inelastic scattering of xenon atoms by quantized vortices in superfluids 

    Pshenichnyuk, IA; Berloff, Natalia G (American Physical SocietyPhysical Review B, 2016-11-01)
    We study inelastic interactions of particles with quantized vortices in superfluids by using a semiclassical matter wave theory that is analogous to the Landau two-fluid equations, but allows for the vortex dynamics. The ...

  • Nonlinear effects in buoyancy-driven variable-density turbulence 

    Rao, P; Caulfield, Colm-cille Patrick; Gibbon, JD (Cambridge University PressJournal of Fluid Mechanics, 2017-01-01)
    We consider the time dependence of a hierarchy of scaled L²ᵐ-norms D_m,ω and D_m,θ of the vorticity ω =∇ x u and the density gradient ∇θ, where θ = log.(ρ*/ ρ*₀), in a buoyancy-driven turbulent flow as simulated by Livescu ...

  • Radically filtered quasi-hereditary algebras and rigidity of tilting modules 

    HAZI, Amit (Cambridge University PressMathematical Proceedings of the Cambridge Philosophical Society, 2017-09)
    Let $\textit{A}$ be a quasi-hereditary algebra. We prove that in many cases, a tilting module is rigid (i.e. has identical radical and socle series) if it does not have certain subquotients whose composition factors extend ...

  • Viscous effects on the acoustics and stability of a shear layer over an impedance wall 

    Khamis, Doran; Brambley, Edward James (Cambridge University PressJournal of Fluid Mechanics, 2017-01-01)
    The effect of viscosity and thermal conduction on the acoustics in a shear layer above an impedance wall is investigated numerically and asymptotically by solving the linearised compressible Navier–Stokes equations (LNSE). ...

  • Freiman homomorphisms on sparse random sets 

    Conlon, D; Gowers, William Timothy (Oxford University PressQuarterly Journal of Mathematics, 2017-02-03)
    A result of Fiz Pontiveros shows that if $A$ is a random subset of $\mathbb{Z}_N$ where each element is chosen independently with probability $N^{-1/2+o(1)}$, then with high probability every Freiman homomorphism defined ...

  • Mixing efficiency in run-down gravity currents 

    Hughes, GO; Linden, Paul Frederick (Cambridge University PressJournal of Fluid Mechanics, 2016-12-25)
    This paper presents measurements of mixing efficiency of the two counter-flowing gravity currents created by symmetric lock exchange in a channel. The novel feature of this work is that the buoyancy Reynolds number of the ...

  • L-space intervals for graph manifolds and cables 

    Rasmussen, Sarah Dean (Cambridge University PressCompositio Mathematica, 2017-05)
    We present a graph manifold analog of the Jankins–Neumann classification of Seifert fibered spaces over $S^2$ admitting taut foliations, providing a finite recursive formula to compute the L-space Dehn-filling interval for ...

  • Multiple instability of layered stratifed plane Couette flow 

    Eaves, Thomas; Caulfield, Colm-cille Patrick (Cambridge University PressJournal of Fluid Mechanics, 2017-02-25)
    We present the linear stability properties and nonlinear evolution of two-dimensional plane Couette flow for a statically stable Boussinesq three-layer fluid of total depth 2$h$ between two horizontal plates driven at ...

  • Tubular free by cyclic groups act freely on CAT(0) cube complexes 

    Button, Jack (Canadian Mathematical SocietyCanadian Mathematical Bulletin, 2017-03-01)
    We identify when a tubular group (the fundamental group of a finite graph of groups with $\mathbb{Z}$$^{2}$ vertex and $\mathbb{Z}$ edge groups) is free by cyclic and show, using Wise's equitable sets criterion, that every ...

  • Aerotaxis in the closest relatives of animals 

    Kirkegaard, Julius Bier; Bouillant, A; Marron, Alan Oliver; Leptos, Kyriacos; Goldstein, Raymond Ethan (eLife Sciences Publications LtdeLife, 2016-11-24)
    As the closest unicellular relatives of animals, choanoflagellates serve as useful model organisms for understanding the evolution of animal multicellularity. An important factor in animal evolution was the increasing ocean ...

  • Nonconvexity of private capacity and classical environment-assisted capacity of a quantum channel 

    Elkouss, D; Strelchuk, Sergii (American Physical SocietyPhysical Review A, 2016-10-17)
    The capacity of classical channels is convex. This is not the case for the quantum capacity of a channel: The capacity of a mixture of different quantum channels exceeds the mixture of the individual capacities and thus ...