African University of Science and Technology: Recent submissions

Now showing items 1121-1140 of 4828

  • Enhancing colour-coded poll sheets using computer vision as a viable Audience Response System (ARS) in Africa 

    Muchaneta, Irikidzai Zorodzai (University of Cape TownFaculty of ScienceDepartment of Computer Science, 2018)
    Audience Response Systems (ARS) give a facilitator accurate feedback on a question posed to the listeners. The most common form of ARS are clickers; Clickers are handheld response gadgets that act as a medium of communication ...

  • Inhomogeneous initial data and small-field inflation 

    Marsh, Carl Marc; Barrow, John David; Ganguly, C (IoPJournal of Cosmology and Astroparticle Physics, 2018-05-08)
    We consider the robustness of small-field inflation in the presence of scalar field inhomo- geneities. Previous numerical work has shown that if the scalar potential is flat only over a narrow in- terval, such as in commonly ...

  • The structure and origin of confined Holmboe waves 

    Lefauve, Adrien; Partridge, JL; Zhou, Q; Dalziel, Stuart Bruce; Caulfield, Colm-cille Patrick; Linden, Paul Frederick (Cambridge University PressJournal of Fluid Mechanics, 2018-08-10)
    Finite-amplitude manifestations of stratified shear flow instabilities and their spatio-temporal coherent structures are believed to play an important role in turbulent geophysical flows. Such shear flows commonly have ...

  • ADHM and the 4d quantum Hall effect 

    Barns-Graham, A; Dorey, Nicholas; Lohitsiri, N; Tong, David; Turner, Carl (Journal of High Energy Physics, 2018-04-01)
    © 2018, The Author(s). Yang-Mills instantons are solitonic particles in d = 4 + 1 dimensional gauge theories. We construct and analyse the quantum Hall states that arise when these particles are restricted to the lowest ...

  • Scalar Hairy Black Holes in Four Dimensions are Unstable 

    Ganchev, Bogdan; Santos, Jorge Eduardo
    We present a numerical analysis of the stability properties of the black holes with scalar hair constructed by Herdeiro and Radu. We prove the existence of a novel gauge where the scalar field perturbations decouple from ...

  • Capillary retraction of the edge of a stretched viscous sheet 

    Munro, James; Lister, John Ronald (Cambridge University PressJournal of Fluid Mechanics, 2018-04-03)
    Surface tension causes the edge of a fluid sheet to retract. If the sheet is also stretched along its edge then the flow and the rate of retraction are modified. A universal similarity solution for the Stokes flow in a ...

  • Relations of the spaces Ap (Ω) and C p (∂Ω) 

    Georgakopoulos, N; Mastrantonis, V; Nestoridis, V
    Let Ω be a Jordan domain in C, J an open arc of ∂Ω and φ : D → Ω a Riemann map from the open unit disk D onto Ω. Under certain assumptions on φ we prove that if a holomorphic function f ∈ H(Ω) extends continuously on Ω ∪ ...

  • Gravity and the spin-2 planar Schroedinger equation 

    Townsend, Paul Kingsley; Bergshoeff, Eric A; Rosseel, Jan
    A Schroedinger equation proposed for the GMP gapped spin-2 mode of fractional Quantum Hall states is found from a novel non-relativistic limit, applicable only in 2+1 dimensions, of the massive spin-2 Fierz-Pauli ...

  • Autophoretic motion in three dimensions. 

    Lisicki, Maciej Krzysztof; Reigh, Shang Yik; Lauga, Eric Jean-Marie (RSCSoft matter, 2018-05)
    Janus particles with the ability to move phoretically in self-generated chemical concentration gra- dients are model systems for active matter. Their motion typically consists of straight paths with rotational diffusion ...

  • A Real-Time Data Stream Processing Model for a Smart City Application Leveraging Intelligent Internet of Things (IOT) Concepts 

    Yakubu, Mulikatu Ibrahim (2017-12-15)
    Due to the vast amount of data that is being generated by the sensors through the smart devices in smart cities, streams of data must be processed in real time to gain insight quickly and to make decisions that are in most ...

  • A Predictive Model for Electricity Consumption in University Campuses using Artificial Neural Networks (A Case Study) 

    Mohammed, Habib Itopa (2017-12-15)
    Energy efficiency is paramount in the quest to achieve sustainable development in the 21st century. Statistics in recent research have shown that in many sectors in any nation’s economy, which include buildings, industries ...

  • Study and Implementation of Wireless Sensor Networks to Manage Energy in a Smart Home 

    Adebayo, Gbenga Waliyi (2017-12-15)
    Many studies have shown that smart homes can use energy more efficiently than traditional buildings. Thus, several researchers have advocated building a smart home in order to reduce energy consumption. In the literature, ...

  • Smart Multimedia Learning System for Automata Theory 

    Sam-Oloyede, Rachael (2017-11-25)
    Education is a vital ingredient for a sustainable economy where “knowledge is power”. M- learning initiatives can lessen the digital divide in education and promote a knowledge-based economy. The high saturation of mobile ...

  • The mean value theorem and Taylor’s theorem for fractional derivatives with Mittag–Leffler kernel 

    Fernandez, Arran; Baleanu, D (SpringerAdvances in Difference Equations, 2018-12-01)
    We establish analogues of the mean value theorem and Taylor’s theorem for fractional differential operators defined using a Mittag-Leffler kernel. We formulate a new model for the fractional Boussinesq equation by using ...

  • A Natural Language Interface for Mobile Devices 

    Unknown author (2018-03-01)
    Creating a robust, automated capability to respond to natural language requests has been a longstanding goal in the development of intelligent systems. This article describes the StartMobile system, originally developed ...

  • Experimental exploration of fluid-driven cracks in brittle hydrogels 

    O'Keeffe, Niall; Huppert, HE; Linden, Paul Frederick (Cambridge University PressJournal of Fluid Mechanics, 2018-06-10)
    Hydraulic fracturing is a procedure by which a fracture is initiated and propagates due to pressure (hydraulic loading) applied by a fluid introduced inside the fracture. In this study we focus on a crack driven by an ...

  • Leading-order Stokes flows near a corner 

    Dauparas, J; Lauga, Eric Jean-Marie (OUPIMA Journal of Applied Mathematics (Institute of Mathematics and Its Applications), 2018-07-25)
    Singular solutions of the Stokes equations play important roles in a variety of fluid dynamics problems. They allow the calculation of exact flows, are the basis of the boundary integral methods used in numerical computations, ...

  • Quantized Skyrmions from SU(4) weight diagrams 

    Halcrow, CJ; Manton, Nicholas Stephen; Rawlinson, JI (Physical Review C, 2018-03-06)
    © 2018 authors. Published by the American Physical Society. Starting from solutions of the lightly bound Skyrme model, we construct many new Skyrmion solutions of the standard Skyrme model with tetrahedral or octahedral ...

  • Spiral density waves and vertical circulation in protoplanetary discs 

    Latter, Henrik Nils; Riols, Antoine (Oxford University PressMonthly Notices of the Royal Astronomical Society, 2018-06-01)
    Spiral density waves dominate several facets of accretion disc dynamics – planet-disc interactions and gravitational instability (GI) most prominently. Though they have been examined thoroughly in two-dimensional simulations, ...

  • Lattice QCD calculation of the B-(s) -> D-(s)* lv form factors at zero recoil and implications for vertical bar V-cb vertical bar 

    Harrison, Judd; Davies, Christine TH; Wingate, Matthew Bowen; Collaboration, HPQCD (PHYSICAL REVIEW D, 2018-03-09)
    © 2018 authors. We present results of a lattice QCD calculation of B→D∗ and Bs→Ds∗ axial vector matrix elements with both states at rest. These zero recoil matrix elements provide the normalization necessary to infer a ...