Browsing Cambridge University by Title
Now showing items 1229-1248 of 1268
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Unsupervised intralingual and cross-lingual speaker adaptation for HMM-based speech synthesis using two-pass decision tree construction
(IEEE Transactions on Audio, Speech and Language Processing, 2010)Hidden Markov model (HMM)-based speech synthesis systems possess several advantages over concatenative synthesis systems. One such advantage is the relative ease with which HMM-based systems are adapted to speakers not ...
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Uptake induced swelling and thermal expansion of CFRP tendons
(Institute of Civil EngineersProceedings of ICE, Structures and Buildings, 2009)Carbon-fibre-reinforced polymer (CFRP) tendons can be used as a corrosion-resistant alternative to steel for reinforcing or prestressing concrete in aggressive marine environments. The design lives of many civil marine ...
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Using expression arrays for copy number detection: an example from E. Coli
(2007-06-14)Abstract Background The sequencing of many genomes and tiling arrays consisting of millions of DNA segments spanning entire genomes have made high-resolution copy number analysis possible. Microarray-based comparative ...
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Using inpainting to construct accurate cut-sky CMB estimators
(American Physical SocietyPhysical Review D - Particles, Fields, Gravitation and Cosmology, 2017-02-23)The direct evaluation of manifestly optimal, cut-sky cosmic microwave background (CMB) power spectrum and bispectrum estimators is numerically very costly, due to the presence of inverse-covariance filtering operations. ...
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Using stratification to mitigate end-effects in quasi-Keplerian Taylor-Couette flow
(Cambridge University PressJournal of Fluid Mechanics, 2016-02-24)Efforts to model accretion disks in the laboratory using Taylor–Couette flow apparatus are plagued with problems due to the substantial impact the end-plates have on the flow. We explore the possibility of mitigating the ...
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Utilising optimised operators and distillation to extract scattering phase shifts
(Proceedings of Science, 2016-01-01)In this investigation, we examine how the precision of energy spectra and scattering phase shifts, extracted in lattice QCD, depend upon the degree of distillation type smearing. We use the variational method to extract ...
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Variability of black-hole accretion discs: a theoretical study
(University of CambridgeDepartment of Applied Mathematics and Theoretical PhysicsTrinity College, 2010-06-08)Accretion discs are fluid-dynamical entities which surround many black holes. Observations reveal that these systems exhibit variability on a range of time scales. This thesis investigates phenomena occurring in black-hole ...
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Variable horizon model predictive control: robustness and optimality
(University of CambridgeDepartment of EngineeringControl Group, 2012-07-03)Variable Horizon Model Predictive Control (VH-MPC) is a form of predictive control that includes the horizon length as a decision variable in the constrained optimisation problem solved at each iteration. It has been ...
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Variable selection with error control: Another look at Stability Selection
(Wiley on behalf of the Royal Statistical SocietyJournal of the Royal Statistical Society: Series B (Statistical Methodology), 2012-06-21)Stability Selection was recently introduced by Meinshausen and B¨uhlmann (2010) as a very general technique designed to improve the performance of a variable selection algorithm. It is based on aggregating the results of ...
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Variation of Gieseker moduli spaces via quiver GIT
(Mathematical Sciences PublishersGeometry & Topology, 2016)We introduce a notion of stability for sheaves with respect to several polarisations that generalises the usual notion of Gieseker-stability. We prove, under a boundedness assumption, which we show to hold on threefolds ...
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Venture Capital Fund Performance and the IPO Market
(CFAP, Cambridge Judge Business School, University of Cambridge, 2008)In this paper, the investment performance of a large database of venture funds is considered over a 28 year period. The results suggest that a portfolio of venture capital partnerships can provide an average return that ...
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Vibration from underground railways: considering piled foundations and twin tunnels
(University of CambridgeDepartment of Engineering, 2011-02-08)Accurate predictions of ground-borne vibration levels in the vicinity of an underground railway are greatly sought after in modern urban centers. Yet the complexity involved in simulating the underground environment means ...
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Violating the Weak Cosmic Censorship Conjecture in Four-Dimensional Anti-de Sitter Space.
(American Physical SocietyPhysical review letters, 2017-05-02)e consider time-dependent solutions of the Einstein-Maxwell equations using anti–de Sitter (AdS) boundary conditions, and provide the first counterexample to the weak cosmic censorship conjecture in four spacetime dimensions. ...
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Viscoplastic boundary layers
(Cambridge University PressJournal of Fluid Mechanics, 2017-02-25)In the limit of a large yield stress, or equivalently at the initiation of motion, viscoplastic flows can develop narrow boundary layers that provide either surfaces of failure between rigid plugs, the lubrication between ...
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Viscous effects on the acoustics and stability of a shear layer over an impedance wall
(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). ...
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Volume preservation by Runge–Kutta methods
(ElsevierApplied Numerical Mathematics, 2016-07-12)It is a classical theorem of Liouville that Hamiltonian systems preserve volume in phase space. Any symplectic Runge–Kutta method will respect this property for such systems, but it has been shown by Iserles, Quispel and ...
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Vortex flow around the bases of obstacles
(University of CambridgeSt. Catharine's CollegeDepartment of Engineering, 1979-02-06)This thesis presents the results of experimental and theoretical investigations of the horseshoe vortex systems caused by boundary layer separation upstream of obstacles mounted on a wall. Flow visualization enabled these ...
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Vortex rings impinging on permeable boundaries
(Physics of Fluids, 2015-01-17)Experiments with vortex rings impinging permeable and solid boundaries are presented in order to investigate the influence of permeability. Utilizing Particle Image Velocimetry, we compared the behaviour of a vortex ring ...