Open Access Repositories: Recent submissions
Now showing items 901-920 of 4204
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Ubiquitous intelligence for smart cities: a public safety approach
(University of Cape TownFaculty of ScienceDepartment of Computer Science, 2017)Citizen-centered safety enhancement is an integral component of public safety and a top priority for decision makers in a smart city development. However, public safety agencies are constantly faced with the challenge of ...
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Irreversible mixing by unstable periodic orbits in buoyancy dominated stratified turbulence
(Cambridge University PressJournal of Fluid Mechanics, 2017-10-26)We consider turbulence driven by a large-scale horizontal shear in Kolmogorov flow (i.e. with sinusoidal body forcing) and a background linear stable strati cation with buoyancy frequency $N^2_B$ imposed in the third, ...
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The geodesic X-ray transform with a $GL(n,\mathbb{C})$-connection
We derive reconstruction formulas for a family of geodesic ray transforms with connection, defined on simple Riemannian surfaces. Such formulas provide injectivity of such all transforms in a neighbourhood of constant ...
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Inequalities for the Gaussian measure of convex sets
This note presents families of inequalities for the Gaussian measure of convex sets which extend the recently proven Gaussian correlation inequality in various directions.
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Active particles in periodic lattices
(Institute of Physics (IoP) and Deutsche Physikalische GesellschaftNew Journal of Physics, 2017-11-01)Both natural and artificial small-scale swimmers may often self-propel in environments subject to complex geometrical constraints. While most past theoretical work on low-Reynolds number locomotion addressed idealised ...
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Augmenting security event information with contextual data to improve the detection capabilities of a SIEM
(University of Cape TownFaculty of ScienceDepartment of Computer Science, 2017)The increasing number of cyber security breaches have revealed a need for proper cyber security measures. The emergence of the internet and the increase in overall connectivity means that data is more easily accessible and ...
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A Variational Model for Joint Motion Estimation and Image Reconstruction
(Society for Industrial and Applied MathematicsSIAM Journal on Imaging Sciences, 2018-01)The aim of this paper is to derive and analyze a variational model for the joint estimation of motion and reconstruction of image sequences, which is based on a time-continuous Eulerian motion model. The model can be set ...
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Layer formation in horizontally forced stratified turbulence: Connecting exact coherent structures to linear instabilities
(Journal of Fluid Mechanics, 2017-12-10)© 2017 Cambridge University Press. We consider turbulence in a stratified 'Kolmogorov' flow, driven by horizontal shear in the form of sinusoidal body forcing in the presence of an imposed background linear stable ...
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The shape of bouncing universes
What happens to the most general closed oscillating universes in general relativity? We sketch the development of interest in cyclic universes from the early work of Friedmann and Tolman to modern variations introduced by ...
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Planck intermediate results: LI. Features in the cosmic microwave background temperature power spectrum and shifts in cosmological parameters
The six parameters of the standard ΛCDM model have best-fit values derived from the Planck temperature power spectrum that are shifted somewhat from the best-fit values derived from WMAP data. These shifts are driven by ...
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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. ...
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Twistor theory at fifty: from contour integrals to twistor strings.
(Proceedings. Mathematical, physical, and engineering sciences, 2017-10-11)
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Linear Waves in the Interior of Extremal Black Holes II
(Springer NatureAnnales Henri Poincare, 2017-12-01)We consider solutions to the linear wave equation in the interior region of extremal Kerr black holes. We show that axisymmetric solutions can be extended continuously beyond the Cauchy horizon and moreover that, if we ...
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The Interval Programming Model Solution Algorithm Experimentation Tools and Results
(2017-09-01)Interval programming (IvP) is model for representing multi-objective optimization problems along with a set of solution algorithms. This paper describes a set of IvP solution experiments run over randomly generated problem ...
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A Data-Driven Feature Extraction Method for Enhanced Phonocardiogram Segmentation
In this work, we present a method to extract features from heart sound signals in order to enhance segmentation performance. The approach is data-driven, since the way features are extracted from the recorded signals is ...
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Inference and Regeneration of Programs that Manipulate Relational Databases
(2017-08-29)We present a new technique that infers models of programs that manipulate relational databases. This technique generates test databases and input commands, runs the program, then observes the resulting outputs and updated ...
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D-modules on rigid analytic spaces II: Kashiwara’s equivalence
(American Mathematical SocietyJournal of Algebraic Geometry, 2018-01-01)Let X be a smooth rigid analytic space. We prove that the category of co-admissible D-cap-modules on a smooth rigid analytic space supported on a closed smooth subvariety is naturally equivalent to the category of co-admissible ...
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Analytical and experimental investigation into the effects of leading-edge radius on gust-aerofoil interaction noise
(Cambridge University PressJournal of Fluid Mechanics, 2017-10-25)This paper investigates the effects of local leading-edge geometry on unsteady aerofoil interaction noise. Analytical results are obtained by extending previous work for parabolic leading edges to leading edges of the form ...
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The calculation of sparticle and Higgs decays in the minimal and next-to-minimal supersymmetric standard models: SOFTSUSY4.0
(ElsevierComputer Physics Communications, 2017-11-01)We describe a major extension of the SOFTSUSY spectrum calculator to include the calculation of the decays, branching ratios and lifetimes of sparticles into lighter sparticles, covering the next-to-minimal supersymmetric ...
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The acoustic Green's function for swirling flow with variable entropy in a lined duct
This paper extends previous work by the authors (Journal of Sound and Vibration, 395:294-316,2017) on the acoustic field inside an annular duct with acoustic lining carrying mean axial and swirling flow so as to allow for ...
