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Now showing items 111-120 of 140
New Singularities in Unexpected Places
(World ScientificInternational Journal of Modern Physics D, 2015-09-28)
Spacetime singularities have been discovered which are physically much weaker than those predicted by the classical singularity theorems. Geodesics evolve through them and they only display infinities in the derivatives ...
Twistors and the massive spinning particle
(IOP ScienceJournal of Physics A: Mathematical and Theoretical, 2015-12-07)
Gauge-invariant twistor variables are found for the massive spinning particle with N-extended local worldline supersymmetry, in spacetime dimensions D = 3, 4, 6. The twistor action is manifestly Lorentz invariant but the ...
The synthesis of di-carboxylate esters using continuous flow vortex fluidics
(Royal Society of ChemistryGreen Chemistry, 2015-12-01)
A vortex fluidic device (VFD) is effective in mediating the synthesis of di-esters at room temperature. Processing under ambient conditions allows for a simple and efficient synthesis, whilst operating under continuous ...
Vortices and Monopoles in a Harmonic Trap
(SpringerJournal of High Energy Physics, 2015-12-15)
The Ω-deformation is a harmonic trap, penning certain excitations near the origin in a manner consistent with supersymmetry. Here we explore the dynamics of BPS monopoles and vortices in such a trap. We pay particular ...
Assessment of ice flow dynamics in the zone close to the calving front of Antarctic ice shelves
(International Glaciological SocietyJournal of Glaciology, 2015-12-01)
We investigate the relationship between four ice-shelf characteristics in the area close to the calving front: ice flow speed, strain rate, ice thickness and shelf width. Data are compiled for these glaciological parameters ...
Propulsion of Bubble-Based Acoustic Microswimmers
(American Physical SocietyPhysical Review Applied, 2015-12-29)
Acoustic microswimmers present a great potential for microfluidic applications and targeted drug delivery. Here, we introduce armored microbubbles (size range, 10–20 μm) made by three-dimensional microfabrication, which ...
Optimal investment: bounds and heuristics
(Incisive Financial PublishingJournal of Computational Finance, 2015-10-28)
High-dimensional optimal investment/consumption problems are hard to deal with, not least because of the difficulty in characterizing the value function. This paper tries to offer ways to determine an approximately optimal ...
Towards Automatic Model Comparison: An Adaptive Sequential Monte Carlo Approach
(Taylor & FrancisJournal of Computational and Graphical Statistics, 2015-08-17)
Model comparison for the purposes of selection, averaging and validation is a problem found throughout statistics. Within the Bayesian paradigm, these problems all require the calculation of the posterior probabilities of ...
A Functional Approach to Deconvolve Dynamic Neuroimaging Data
(Taylor & FrancisJournal of the American Statistical Association, 2015-11-20)
Positron Emission Tomography (PET) is an imaging technique which can be used
to investigate chemical changes in human biological processes such as cancer development or neurochemical reactions. Most dynamic PET scans are ...
Generalised additive and index models with shape constraints
(WileyJournal of the Royal Statistical Society: Series B (Statistical Methodology), 2015-10-26)
We study generalized additive models, with shape restrictions (e.g. monotonicity, convexity and concavity) imposed on each component of the additive prediction function. We show that this framework facilitates a non-parametric ...