African University of Science and Technology: Recent submissions

Now showing items 1821-1840 of 4824

  • Mechanical Properties of Natural Fiber-Reinforced Earth-Based Composites 

    Kabiru, Mustapha (2015-11-23)
    This study presents the results of a combined experimental and theoretical study of the strength, fracture toughness and interfacial properties of natural fiber-reinforced earth-based composite materials. The composites, ...

  • Nano and Micro-Particles for Breast Cancer Detection and Treatment 

    Obayemi, David John (2015-03-15)
    This dissertation shows the use of material science and engineering approaches in developing solutions to problems in the life science with focus in nano and micro-particles for the detection and treatment of cancer. It ...

  • Layered Composite thin Films for Cost Effective Transparent Organic Solar Cell Electrodes 

    Egidius, Rutatizibwa Rwenyagila (2015-08-20)
    In this dissertation two main themes are explored. In the first part some phenomenologies of light transport across the ZnO/Al/ZnO (ZAZ) thin film multilayer structures are investigated. The multilayered ZAZ thin film ...

  • The work of Lucio Russo on percolation 

    Grimmett, Geoffrey Richard
    The contributions of Lucio Russo to the mathematics of percolation and disordered systems are outlined. The context of his work is explained, and its ongoing impact on current work is described and amplified.

  • The Importance of the Unsteady Kutta Condition when Modelling Gust-Aerofoil Interaction 

    Ayton, Lorna Jane; Gill, JR; Peake, Nigel (ElsevierJournal of Sound and Vibration, 2016-06-01)
    The Kutta condition is applied to aerofoils with sharp trailing edges to allow for viscous effects to be considered within a simplified system of equations that are inviscid. This paper discusses in detail the inclusion ...

  • Clay Ceramic Materials for Water Filtration: Properties, Processing and Performance 

    Ebenezer, Annan (2016-03-16)
    Ceramic water filters are promising household water treatment technology, as they are capable of removing waterborne pathogens and thereby reducing diarrheal disease. Flow rates are the main quality control criterion for ...

  • Implantable Biomedical Devices for Localized Breast Cancer Drug Delivery 

    Danyuo, Yiporo (2015-10-15)
    This thesis focused on an implantable encapsulated structures that can deliver localized heating and controlled released of prodigiosin (PG) (a cancer drug) synthesized by bacteria (Serratia marcescens (subsp. marcescens)). ...

  • Total Positivity in Markov Structures 

    Fallat, S; Lauritzen, S; Sadeghi, Kayvan; Uhler, C; Wermuth, N; Zwiernik, K (Institute of Mathematical StatisticsAnnals of Statistics, 2017-06)
    We discuss properties of distributions that are multivariate totally positive of order two (MTP$_{2}$) related to conditional independence. In particular, we show that any independence model generated by an MTP$_{2}$ ...

  • ππ→πγ$^{∗}$ amplitude and the resonant ρ→πγ$^{∗}$ transition from lattice QCD 

    Briceño, Raúl A; Dudek, Jozef J; Edwards, Robert G; Shultz, Christian J; Thomas, Christopher Edward; Wilson, David John; Hadron, Spectrum Collaboration (American Physical SocietyPhysical Review D, 2016-06-10)
    We present a determination of the P-wave ππ→πγ$^{⋆}$ transition amplitude from lattice quantum chromodynamics. Matrix elements of the vector current in a finite volume are extracted from three-point correlation functions, ...

  • Second-Order Asymptotics of Visible Mixed Quantum Source Coding via Universal Codes 

    Leditzky, Felix; Datta, Nilanjana (IEEEIEEE Transactions on Information Theory, 2016-05-23)
    The simplest example of a quantum information source with memory is a mixed source, which emits signals entirely from one of two memoryless quantum sources with given $\textit{a priori}$ probabilities. Considering a mixed ...

  • Preconditioned ADMM with nonlinear operator constraint 

    Benning, Martin; Knoll, Florian; Schonlieb, Carola-Bibiane; Valkonen, Tuomo (SpringerIFIP Advances in Information and Communication Technology, 2016)
    We are presenting a modification of the well-known Alternating Direction Method of Multipliers (ADMM) algorithm with additional preconditioning that aims at solving convex optimisation problems with nonlinear operator ...

  • Multi-Contrast MRI Reconstruction with Structure-Guided Total Variation 

    Ehrhardt, Matthias Joachim; Betcke, Marta M (Society for Industrial and Applied MathematicsSIAM Journal on Imaging Sciences, 2016-08-04)
    Magnetic resonance imaging (MRI) is a versatile imaging technique that allows different contrasts depending on the acquisition parameters. Many clinical imaging studies acquire MRI data for more than one of these contrasts—such ...

  • Turning on gravity with the Higgs mechanism 

    Alexander, Stephon; Barrow, John David; Magueijo, João (IOP PublishingClassical and Quantum Gravity, 2016-06-21)
    We investigate how a Higgs mechanism could be responsible for the emergence of gravity in extensions of Einstein theory, with a suitable low energy limit. In this scenario, at high energies, symmetry restoration could "turn ...

  • On the quadratic invariant of binary sextics 

    Dunajski, Maciej Lukasz; Penrose, Roger (Cambridge University PressMathematical Proceedings of the Cambridge Philosophical Society, 2016-07-28)
    We provide a geometric characterisation of binary sextics with vanishing quadratic invariant.

  • Unsteady flow and particle migration in dense, non-Brownian suspensions 

    Hermes, Michiel; Guy, Ben M; Poy, Guilhem; Cates, Michael Elmhirst; Wyart, Matthieu; Poon, Wilson CK (AIPJournal of Rheology, 2016)
    We present experimental results on dense corn-starch suspensions as examples of non-Brownian, nearly-hard particles that undergo continuous and discontinuous shear thickening (CST and DST) at intermediate and high densities ...

  • Dewatering of fibre suspensions by pressure filtration 

    Hewitt, Duncan; Paterson, DT; Balmforth, NJ; Martinez, DM (AIP PublishingPhysics of Fluids, 2016-06-09)
    A theoretical and experimental study of dewatering of fibre suspensions by uniaxial compression is presented. Solutions of a one-dimensional model are discussed and asymptotic limits of fast and slow compression are explored. ...

  • On turbulence driven by axial precession and tidal evolution of the spin–orbit angle of close-in giant planets 

    Barker, Adrian J. (Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-05-16)
    The spin axis of a rotationally deformed planet is forced to precess about its orbital angular momentum vector, due to the tidal gravity of its host star, if these directions are misaligned. This induces internal fluid ...

  • Gravitoturbulence in magnetized protostellar discs 

    Riols, A; Latter, Henrik Nils (Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-05-11)
    Gravitational instability (GI) features in several aspects of protostellar disc evolution, most notably in angular momentum transport, fragmentation, and the outbursts exemplified by FU Ori and EX Lupi systems. The outer ...

  • Interaction of turbulence with the leading-edge stagnation point of a thin aerofoil 

    Ayton, Lorna Jane; Peake, Nigel (Cambridge University PressJournal of Fluid Mechanics, 2016)
    An asymptotic model is constructed to analyse the interaction of turbulence generated far upstream with a thin elliptic-nosed solid body in uniform flow. The leading-edge stagnation point causes significant deformation of ...

  • Invariant Distributions and Tensor Tomography for Gaussian Thermostats 

    Assylbekov, Yernat M; Zhou, Hanming (International PressCommunications in Analysis and Geometry, 2016)
    In this paper we consider the Gaussian thermostat ray transforms on both closed Riemannian surfaces and compact Riemannian surfaces with boundary. We establish certain results on the injectivity of the thermostat ray ...