African University of Science and Technology: Recent submissions
Now showing items 1301-1320 of 4824
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Nonlinear evolution of linear optimal perturbations of strongly stratified shear layers
(Cambridge University PressJournal of Fluid Mechanics, 2017-08-25)The Miles-Howard theorem states that a necessary condition for normal-mode instability in parallel, inviscid, steady stratified shear flows is that the minimum gradient Richardson number, $Ri_{g,min}$, is less than 1/4 ...
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Energy dissipation rate limits for flow through rough channels and tidal flow across topography (vol 808, pg 562, 2016)
(JOURNAL OF FLUID MECHANICS, 2018-01-10)This is a corrigendum
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Small-time fluctuations for sub-Riemannian diffusion loops
We study the small-time fluctuations for diffusion processes which are conditioned by their initial and final positions, under the assumptions that the diffusivity has a sub-Riemannian structure and that the drift vector ...
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Role of overturns in optimal mixing in stratified mixing layers
(Cambridge University PressJournal of Fluid Mechanics, 2017-09-10)Turbulent mixing plays a major role in enabling the large scale ocean circulation. The accuracy of mixing rates estimated from observations depends on our understanding of basic fluid mechanical processes underlying the ...
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Trend to equilibrium for the Becker–Döring equations: an analogue of Cercignani's conjecture
(Mathematical Sciences PublishersAnalysis and PDE, 2017-08-01)We investigate the rate of convergence to equilibrium for subcritical solutions to the Becker–Döring equations with physically relevant coagulation and fragmentation coefficients and mild assumptions on the given initial ...
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Trust in numbers
(WileyJournal of the Royal Statistical Society. Series A: Statistics in Society, 2017-10-01)Those who value quantitative and scientific evidence are faced with claims both of a reproducibility crisis in scientific publication, and of a post-truth society abounding in fake news and alternative facts. Both issues ...
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Modeling Crude Oil Production Outlook: A Case Study of the Oil and Gas Industry in Nigeria
(Society of Petroleum Engineers (SPE), 2014-08-05)In the past four decades, Nigeria has made impact on the global oil and gas exploration and production industry. As one of the lead exporters of crude oil and natural gas in Africa, an oil production model which tracks oil ...
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Petroleum Reserves Growth Trend and Pattern: A Case Study of the Niger Delta Basin in Nigeria
(Society of Petroleum Engineers (SPE), 2014-08-05)For the purpose of this paper, reserves growth is classified into three main categories: new pool discoveries, reserves revision and reserves extension. For each category, there are distinct factors affecting positive and ...
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In situ accretion of gaseous envelopes on to planetary cores embedded in evolving protoplanetary discs
(Oxford University PressMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2017-09-21)The core accretion hypothesis posits that planets with significant gaseous envelopes accreted them from their protoplanetary discs after the formation of rocky/icy cores. Observations indicate that such exoplanets exist ...
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Autonomous COLREGS Modes and Velocity Functions
(2017-05-16)This paper concerns an implementation of an autonomy system for unmanned surface vessels operating in accordance with the Coast Guard Collision Regulations (COLREGS). The autonomy system is implemented by associating a ...
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Dynamical tides in exoplanetary systems containing hot Jupiters: Confronting theory and observations
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2017-09-11)We study the effect of dynamical tides associated with the excitation of gravity waves in an interior radiative region of the central star on orbital evolution in observed systems containing hot Jupiters. We consider ...
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Phoretic Interactions Generically Induce Dynamic Clusters and Wave Patterns in Active Colloids.
(Physical review letters, 2017-06-28)We introduce a representative minimal model for phoretically interacting active colloids. Combining kinetic theory, linear stability analyses, and a general relation between self-propulsion and phoretic interactions in ...
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Function of bacteriophage G7C esterase tailspike in host cell adsorption.
(Molecular microbiology, 2017-08)
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Fundamentals of Laser Dynamics
(2013-05-13)The thesis presents the modeling and simulation of three types of lasers namely; Semicondoctor laser, Solid state laser and CO 2 laser. The rate equations were derived and simulated to examine the dynamic behaviour of the ...
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The Design of an On-Chip Silicon Photonic Diode
(2013-05-13)This work presents numerical calculation of electromagnetic waves in unidirectional on-chip silicon optical diodes. An original optical diode, designed by Wang et. al. [Opt. Express. 19, 26948-26955 (2011)], is based on ...
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Simulation of Carbon Nanotube Growth
(2013-05-13)The basic understanding of the underlying techniques of growing Carbon Nanotubes (CNTs) with a specific chirality is still obscure and needs to be understood so as to properly harness its potentials. Using both Classical ...
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Electro-Magnetic Duality, Magnetic monopoles and Topological Insulators
(2013-05-13)The Maxwell equations of electrodynamics acquire an additional symmetry if one assumes the existence of hypothetical particles-magnetic monopoles, carrying a magnetic charge. The additional internal symmetry is the ...
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Femtosecond Laser Surface Texturing of Materials for Various Applications
(2013-05-13)Femtosecond lasers represent an electromagnetic field with field intensities approaching and even exceeding atomic binding field. When irradiated on a target, the material responses change from linear to nonlinear within ...
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Nonlinear Effect in-flow in Porous Duct
(2013-05-13)In general, it is assumed in some non viscous flows that the flow velocity is constant at a cross-section. In this thesis, If we impose more realistic boundary conditions by, for example, introducing viscosity,and suction ...
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Influence of Molecular Polarizability on the Active Layer of Organic Photovoltaic Cells: A case study of Poly(3-hexylthiophene)
(2013-05-13)The complexity of the microstructure of the active layer in organic photo- voltaics (OPVs) poses a unique challenge in improving the efficiency of OPV devices. Molecular dynamics (MD) simulation provides a direct route ...









