Browsing Department of Materials Science and Metallurgy by Title
Now showing items 102-121 of 648
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Connection between nonlinear energy optimization and instantons.
(American Physical SocietyPhysical review. E, 2018-01)How systems transit between different stable states under external perturbation is an important practical issue. We discuss here how a recently developed energy optimization method for identifying the minimal disturbance ...
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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 ...
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Consistency of the recent ATLAS Z+E_T^miss excess in a simplified general gauge mediation model
(APSPhysical Review D, 2015-05-20)ATLAS recently reported a 3σ excess in a leptonic-Z+E_T^miss channel. This was interpreted in the literature in a simplified general gauge mediation model containing a gluino, a Higgsino next-to-lightest supersymmetric ...
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Constrained dynamics and higher derivative systems in modified gravity
(University of CambridgeDepartment of Applied Mathematics and Theoretical Physics, 2015-06-09)In this thesis, higher derivative theories and constrained dynamics are investigated in detail. In the first part of the thesis, we discuss how the Ostrogradski instability emerges in non-degenerate higher derivative ...
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Contractile and chiral activities codetermine the helicity of swimming droplet trajectories
(National Academy of SciencesProceedings of the National Academy of Sciences of the United States of America, 2017-05-02)Active fluids are a class of nonequilibrium systems where energy is injected into the system continuously by the constituent particles themselves. Many examples, such as bacterial suspensions and actomyosin networks, are ...
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Convective mass transfer from a submerged drop in a thin falling film
(Cambridge University PressJournal of Fluid Mechanics, 2016-01-25)We study the fluid mechanics of removing a passive tracer contained in small, viscous drops attached to a flat inclined substrate using thin gravity-driven film flows. A convective mass transfer establishes across the ...
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Cool and hot emission in a recurring active region jet
Aims. We present a thorough investigation of the cool and hot temperature components in four recurring active region jets observed on July 10, 2015 using the Atmospheric Imaging Assembly (AIA), X-ray Telescope (XRT), and ...
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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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Cortical microtubule nucleation can organise the cytoskeleton of Drosophila oocytes to define the anteroposterior axis
(eLifeeLife, 2015-09-25)Many cells contain non-centrosomal arrays of microtubules (MTs), but the assembly, organisation and function of these arrays are poorly understood. We present the first theoretical model for the non-centrosomal MT cytoskeleton ...
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Cosmological models in energy-momentum-squared gravity
(American Physical SocietyPhysical Review D, 2017-12-15)We study the cosmological effects of adding terms of higher-order in the usual energy-momentum tensor to the matter lagrangian of general relativity. This is in contrast to most studies of higher-order gravity which focus ...
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Cosmological solutions of $\small \textit{f(T)}$ gravity
(American Physical SocietyPhysical Review D, 2016-07-28)In the cosmological scenario in $\small \textit{f(T)}$ gravity, we find analytical solutions for an isotropic and homogeneous universe containing a dust fluid and radiation and for an empty anisotropic Bianchi I universe. ...
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Cosmological solutions with gravitational particle production and nonzero curvature
(American Physical SocietyPhysical Review D - Particles, Fields, Gravitation and Cosmology, 2017-05-26)In a homogeneous and isotropic universe with nonzero spatial curvature we consider the effects of gravitational particle production in the dynamics of the universe. We show that the dynamics of the universe in such a ...
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Coupled ππ, KK̅ scattering in P-wave and the ρ resonance from lattice QCD
(APSPhysical Review D, 2015-11-02)We determine elastic and coupled-channel amplitudes for isospin-1 meson-meson scattering in P-wave, by calculating correlation functions using lattice QCD with light quark masses such that m_π = 236 MeV in a cubic volume ...
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Coupled-channel $\textit{Dπ}$, $\textit{Dη}$ and $\textit{D$_{s}$$\bar K$}$ scattering from lattice QCD
(SpringerJournal of High Energy Physics, 2016-10-04)We present the first lattice QCD study of coupled-channel $\textit{Dπ}$, $\textit{Dη}$ and $\textit{D$_{s}$$\bar K$}$ scattering in isospin-1/2 in three partial waves. Using distillation, we compute matrices of correlation ...
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Crystallization and melting in geological fluid mechanics
(University of CambridgeDepartment of Applied Mathematics and Theoretical Physics, 1991-07-12)
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Cyclic mixmaster universes
(American Physical SocietyPhysical Review D, 2017-04-19)We investigate the behavior of bouncing Bianchi type IX “mixmaster” universes in general relativity. This generalizes all previous studies of the cyclic behavior of closed spatially homogeneous universes with and without ...
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Data analysis issues for allele-specific expression using Illumina's GoldenGate assay
(2010-05-26)Abstract Background High-throughput measurement of allele-specific expression (ASE) is a relatively new and exciting application area for array-based technologies. In this paper, we explore several data sets which make use ...
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Decay of the Cosmic Vacuum Energy
(SpringerFestschrift, 2016)In his 2005 review, $\textit{Gravity and the Thermodynamics of Horizons}$, Paddy suggested that a vacuum in thermal equilibrium with a bath of radiation should have a gradually diminishing energy. We work through the ...
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Density diagnostics derived from the O IV and S IV intercombination lines observed by IRIS
(EDP SciencesAstronomy & Astrophysics, 2016)The intensity of the O IV 2s$^{2}$ 2p $^{2}$P-2s2p$^{2}$ $^{4}$P and S IV 3 s$^{2}$ 3p $^{2}$P- 3s 3p$^{2}$ $^{4}$ P intercombination lines around 1400 Å observed with the Interface Region Imaging Spectrograph (IRIS) provide ...
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Dependence on aspect ratio of symmetry breaking for oscillating foils: implications for flapping flight
(Cambridge University PressJournal of Fluid Mechanics, 2015-12-07)Using two-dimensional direct numerical simulations, we investigate the flow in a fluid of kinematic viscosity ν and density ρ around elliptical foils of density ρ_s with major axis c and minor axis b for three different ...