African University of Science and Technology: Recent submissions
Now showing items 1521-1540 of 4824
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Data and Code for "Automatic Identification of Narrative Diegesis and Point of View"
(2016-11-09)This archive contains the code and data for the workshop article "Automatic Identification of Narrative Diegesis and Point of View," published in 2016 in the 2nd Workshop for Computing News Storylines (CNewsStory 2016), ...
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Detrainment of plumes from vertically distributed sources
(SpringerEnvironmental Fluid Mechanics, 2016-11-22)We present experimental results demonstrating that, for the turbulent plume from a buoyancy source that is vertically distributed over the full area of a wall, detrainment qualitatively changes the shape of the ambient ...
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Report on the 2015 NSF Workshop on Unified Annotation Tooling
(2016-11-08)On March 30 & 31, 2015, an international group of twenty-three researchers with expertise in linguistic annotation convened in Sunny Isles Beach, Florida to discuss problems with and potential solutions for the state of ...
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Tautological rings for high-dimensional manifolds
(Cambridge University PressCompositio Mathematica, 2017-04)We study tautological rings for high-dimensional manifolds, that is, for each smooth manifold $M$ the ring $R^*$($M$) of those characteristic classes of smooth fibre bundles with fibre $M$ which is generated by generalised ...
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Hydrodynamic interactions between nearby slender filaments
(IOP PublishingEPL (Europhysics Letters), 2016-11-28)Cellular biology abound with filaments interacting through fluids, from intracellular microtubules, to rotating flagella and beating cilia. While previous work has demonstrated the complexity of capturing nonlocal hydrodynamic ...
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On the Absence of Uniform Recovery in Many Real-World Applications of Compressed Sensing and the Restricted Isometry Property and Nullspace Property in Levels
(Society for Industrial and Applied MathematicsSiam Journal on Imaging Sciences, 2017-03-15)The purpose of this paper is twofold. The first is to point out that the property of uniform recovery, meaning that all sparse vectors are recovered, does not hold in many applications where compressed sensing is successfully ...
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Pairwise Markov properties for regression graphs
(WileyStat, 2016-11-13)With a sequence of regressions, one may generate joint probability distributions. One starts with a joint, marginal distribution of context variables having possibly a concentration graph structure and continues with an ...
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Mobility of an axisymmetric particle near an elastic interface
(Cambridge University PressJournal of Fluid Mechanics, 2017-01-01)Using a fully analytical theory, we compute the leading-order corrections to the translational, rotational and translation–rotation coupling mobilities of an arbitrary axisymmetric particle immersed in a Newtonian fluid ...
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Questioning the Mpemba effect: hot water does not cool more quickly than cold
(Nature Publishing GroupScientific Reports, 2016-11-24)The Mpemba effect is the name given to the assertion that it is quicker to cool water to a given temperature when the initial temperature is higher. This assertion seems counter-intuitive and yet references to the effect ...
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Inelastic scattering of xenon atoms by quantized vortices in superfluids
(American Physical SocietyPhysical Review B, 2016-11-01)We study inelastic interactions of particles with quantized vortices in superfluids by using a semiclassical matter wave theory that is analogous to the Landau two-fluid equations, but allows for the vortex dynamics. The ...
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Nonlinear effects in buoyancy-driven variable-density turbulence
(Cambridge University PressJournal of Fluid Mechanics, 2017-01-01)We consider the time dependence of a hierarchy of scaled L²ᵐ-norms D_m,ω and D_m,θ of the vorticity ω =∇ x u and the density gradient ∇θ, where θ = log.(ρ*/ ρ*₀), in a buoyancy-driven turbulent flow as simulated by Livescu ...
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Alpenhorn: Bootstrapping Secure Communication without Leaking Metadata
(2016-10-05)Alpenhorn is the first system for initiating an encrypted connection between two users that provides strong privacy and forward secrecy guarantees for metadata (i.e., information about which users connected to each other) ...
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Radically filtered quasi-hereditary algebras and rigidity of tilting modules
(Cambridge University PressMathematical Proceedings of the Cambridge Philosophical Society, 2017-09)Let $\textit{A}$ be a quasi-hereditary algebra. We prove that in many cases, a tilting module is rigid (i.e. has identical radical and socle series) if it does not have certain subquotients whose composition factors extend ...
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Statistical Data-Driven Models for Forecasting Production Performance with Uncertainty Analysis
(2014-12-20)Data-driven analytical models are important tools employed in the petroleum industry to forecast production rates and reserves of petroleum assets. Studies have shown that existing rate forecasting models project future ...
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Investigating the Impact of Pressure Depletion on the Estimation of Reserves and Recovery Factors in Naturally Fractured Reservoirs
(2014-12-20)The complexity of naturally fractured reservoirs poses constrains on reservoir engineers in estimating reserves and recovery factor in naturally fractured reservoirs. Naturally fractured reservoirs like all other hydrocarbon ...
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Development of Coning Correlations for Oil Rim Reservoirs using Experimental Design and Response Surface Methodology
(2014-12-20)Proper management of thin oil rim reservoirs is required to maximize recovery and minimizes coning tendencies. The objective of this study is to determine the effect of reservoir and fluid properties on coning tendencies ...
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Pressure Transient Analysis of Hydraulically Fractured Wells in Multilayered Reservoirs
(2011-12-20)New equations for bilinear, formation linear and pseudo-radial flow regimes in an infinite commingled fractured multilayered reservoir have been developed. The equations have been extended to Tiab’s Direct Synthesis Technique ...
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Implications of Production Decline Patterns, Cost Depreciation Methods and Fiscal Regimes on Offshore Profitability in Nigeria
(2011-12-20)Upstream petroleum industry remains one of the most prolific industries in terms of technology and risk capital transfer. Consequently, governments all over the world try to formulate political as well as economic structures ...
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Evaluation of Petrophysical Properties in the Ak Field of the Niger Delta Province of Nigeria Using Integrated Data
(2013-05-25)The AK field is an oil field draining the Agbada Formation, one of the three units of the Niger Delta Province, which started forming about 50 million years ago. Reservoirs from the AK field are sandstones and are located ...
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Power-Law Fluid Pressure Behaviour in Homogenous and Naturally Fractured Reservoir with Spherical Flow
(2013-04-30)Studies have revealed most wells are usually completed with limited or restricted-entry and it’s often characterized with spherical flow behaviour. High viscosity crude by their nature may also exhibit Non-Newtonian flow ...







