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A two-fluid model for locomotion under self-confinement
(American Physical SocietyPhysical Review Fluids, 2017-09-01)
The bacterium Helicobacter pylori causes ulcers in the stomach of humans by invading mucus layers protecting epithelial cells. It does so by chemically changing the rheological properties of the mucus from a high-viscosity ...
A Yellow Polariton Condensate in a Dye Filled Microcavity
(WileyAdvanced Optical Materials, 2017-09-18)
Polariton condensation in the yellow part of the visible spectrum from a planar organic semiconductor microcavity containing the molecular dye bromine-substituted boron-dipyrromethene is observed. This study provides ...
Phoretic Interactions Generically Induce Dynamic Clusters and Wave Patterns in Active Colloids.
(Physical review letters, 2017-06-28)
We introduce a representative minimal model for phoretically interacting active colloids. Combining kinetic theory, linear stability analyses, and a general relation between self-propulsion and phoretic interactions in ...
Scattering of biflagellate micro-swimmers from surfaces
(American Physics SocietyPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics, 2017-08-10)
We use a three-bead-spring model to investigate the dynamics of bi-flagellate micro-swimmers near a surface. While the primary dynamics and scattering are governed by geometric-dependent direct contact, the fluid flows ...
Aspects of fluid dynamics and the fluid/gravity correspondence
(University of CambridgeDAMTPTrinity, 2017-09-01)
This thesis considers various extensions to the fluid/gravity correspondence as well as problems fundamental to the study of fluid dynamics. The fluid/gravity correspondence is a map between the solutions of the Navier-Stokes ...
Adjoint-based optimization of displacement ventilation flow
(ElsevierBuilding and Environment, 2017-11-01)
We demonstrate the use of the ‘Direct-Adjoint-Looping method’ for the identification of optimal buoyancy-driven ventilation flows governed by Boussinesq equations. We use the incompressible Reynolds-averaged Navier-Stokes ...
Entropic Comparison of Atomic-Resolution Electron Tomography of Crystals and Amorphous Materials
(American Physical SocietyPhysical Review Letters, 2017-10-20)
Electron tomography bears promise for widespread determination of the three-dimensional arrangement of atoms in solids. However, it remains unclear whether methods successful for crystals are optimal for amorphous solids. ...
Zonal flows in accretion discs and their role in gravito-turbulence
(University of CambridgeDepartment of Applied Mathematics and Theoretical Physics (DAMTP)St Edmund's, 2017-10-01)
This thesis focuses on the evolution of zonal flows in self-gravitating accretion discs and their resulting effect on disc stability; it also studies the process of disc gravito-turbulence, with particular emphasis given ...
Spontaneous oscillations of elastic filaments induced by molecular motors.
(The Royal SocietyJournal of the Royal Society, Interface, 2017-11)
It is known from the wave-like motion of microtubules in motility assays that the piconewton forces that motors produce can be sufficient to bend the filaments. In cellular phenomena such as cytosplasmic streaming, molecular ...
Newtonian Twistor Theory
(University of CambridgeDAMTPTrinity College, 2017-10-01)
In twistor theory the nonlinear graviton construction realises four-dimensional antiself-
dual Einstein manifolds as Kodaira moduli spaces of rational curves in threedimensional
complex manifolds. We establish a Newtonian ...