Research Papers/Topics in Applied Physics

Investigating The Effects of Leachate on Groundwater Repositories in Major Dumpsites in Enugu State, Nigeria, Using Integrated Approach

ABSTRACT   The integrated study involving electrical resistivity method and physicochemical analysis of water samples was carried out to investigate the effect of dumpsite leachate on groundwater repositories around the dumpsites in Ikot Ekpene, Uyo and Eket Local Government Areas of Akwa Ibom State. A total of thirty-three (33) vertical electrical sounding (VES) employing Schlumberger electrode configuration and five profiles of electrical resistivity tomography (ERT) were car...

Surface Modification Of Polymeric Biomaterials For Cell/Tissue Integration

ABSTRACT This thesis presented the surface modification of polydimethyl siloxane (PDMS) to enhance surface wettability and surface roughness. Physical and chemical modifications were performed on cured surfaces of PDMS and PDMS-based nanocomposites. Firstly, physical modifications were done by direct coating of PDMS-based substrates with biopolymers such as polyethylene glycol (PEG), poly lactic-co-glycolic acid (PLGA) and sodium alginate (SA). On the other hand, coatings were done with...

Optical Properties Of Metal Clusters From First Principles Calculations

ABSTRACTGround State structures of neutral Copper clusters CuN=3−6 were generated and optimised within the framework of the Density Functional Theory (DFT) using Generalised Gradient Approximation (GGA) and ultrasoft pseudopotential. The shapes and binding energies of the clusters obtained showed good agreement with other theoretical works, except for the trimer cluster which has the shape of an equilateral triangle rather than the isosceles triangle as reported in previous works. The o...

Analysis Of Magneto Hemodynamics Of Blood In A Stenosed Artery

Abstract Human body responds to physical activities, external temperature, external magnetic field, and other factors by homeostatically adjusting its blood flow in order to deliver nutrients such as oxygen and glucose to every organ in the body and allow them to function. Complications in this hemodynamic may arise due to acute coronary syndromes such as stenosis or arteriosclerosis leading to obstruction of coronary arteries. These complications do cause a change in the blood flow to the...

Theoretical And Computational Modeling Of The Effects Of Electromagnetic Field On The Plasmodium Falciparum

Abstract The study explores the potential effects of the remote application of cyclic magnetic field to the female anopheles mosquitoes that carry malaria parasites. The goal is to develop a theoretical basis that can guide the cyclic activation of the magnetic field to induce the inactivity of the malaria parasite without killing the mosquitoes. The model considers the hemozoin within the malaria parasite as a cluster of magnetic nanoparticels. The potential effects of the applied magn...

Topological Antiferromagnetic Magnons

ABSTRACTWe have studied a model for a non-collinear but coplanar antiferromagnetic spin texture on a two dimensional kagome lattice structure in the presence of DzyaloshinskiiMoriya Interaction (DMI). We observed some interesting topological properties in our system i.e. the presence of non-trivial edge state in the wave function. This non-trivial edge state, which mainly surfaced in the presence of the DMI, showed robustness against the external magnetic eld and thus can be further studi...

Structural, Electronic And Optical Properties Of Cu2SnS3 Solar Absorber: A First-Principle Density Functional Theory Investigation

ABSTRACTThe development of inexpensive, non-toxic, high efficiency and earth-abundant solar absorbers is critical for terawatt scale implementation of photovoltaics. Cu2SnS3 is a promising earth abundant absorber material that is attracting attention recently for optoelectronic application including photovoltaic solar cells. However, very little is known about the relationship between structural and optical properties such as the absorbance, reflectivity, refractive index, extinction coe...

Pulsed Lasers In Lidar Application: Models For Optimizing Wind Turbine Performance

ABSTRACTSince the appearance of the first wind turbines at the end of the nineteenth century, wind energy has been considered to be a renewable energy source for not just developed countries but also developing countries as well. Thus, since 2004, there has been a steady rise in wind energy production worldwide, with substantial actively installed capacity in Africa. However, due to the fact that wind turbines are highly dynamic systems that are excited by stochastic loads from the wind, v...

Theoretical Study Of Current-Induced Dynamics Of An Antiferromagnetic Skyrmionium

ABSTRACT In this thesis, we present a theoretical study on the current-induced nucleation and propagation of antiferromagnetic skyrmionium. A skyrmionium, also known as 2π-skyrmion, is a vortex-like magnetic structure characterized by zero topological charge. We show by means of micro-magnetic simulation that an antiferromagnetic skyrmionium can be nucleated via a local injection of spin current with toroidal distribution. Our systematic study of the current-induced dynamics shows that a...

Geology of Ekerekunta And Environs

ABSTRACT We visited various locations during the time of our field exercise which include: Ekerekunta, Akpoha, Ogo ubi, Okpo ezi, Amaeta Enu. The present study area is bound within the latitude of 5055” N to 6° 0’ 0” N and longitude of 7055” E to 8° 1’ 0” E in the Southern Benue Trough within the Afikpo syncline and Abakaliki anticlinorium in south eastern Nigeria. The shale units underlie the bioturbated sandstones. Sedimentary structures were also observed in the stu...

The Physico-Mechanical And Morphological Properties Of -Cellulose-Filled Polystyrene (Ps) And Polyvinyl Acetate (Pvac) Blends

ABSTRACTStudies of physico-mechanical and morphological properties of pure and -cellulose reinforced blends of polystyrene (PS) and poly (vinyl acetate) (PVAc) are reported in this work. The compression moulded articles of the blends of different compositions (10:90, 20:80, 30:70, 40:60, 50:50, 60:40, 70:30, 80:20 and 90:10, PS/PVAc) were tested for mechanical performance, absorption behaviour, void activity and morphological arrangements. Comparison of mechanical properties such as tensil...

Combination And Tracking Control Of Chaotic Systems

ABSTRACT Combination-control of two or more systems which may have important application in Josephson junction ratchet array, and other physical systems has not been explored. Most of the theoretical framework is on combination synchronization, and the need for combination tracking control. In this paper tracking control of 2-D Duffing oscillator, 3-D Lorenz-Stenflo, 4-D Lorenz-Stenflo systems, as well as combination-tracking control of two, three, four and five systems evolving from dif...

DETECTIONOF TRACE GAS (WATER VAPOUR) USING QUANTUM CASCADE LASER OPEN - PATH SYSTEM (QCLOPS) VERSION 2 SENSOR AND THE ANALYSIS OF SMOKE FROM SOME SELECTED WOOD SPECIES

ABSTRACTA Quantum Cascade Laser Open-Path System (QCLOPS) version 2 sensor has been set-up and used to measure water vapour in the troposphere.The QCLOPS version 2 sensor was compared with a commercial humidity sensor. A positive correlation of 71.46 % was established between the coefficient of variation of the version 2 sensor and the mass concentration of the commercial humidity sensor.Ten different wood species namely Kroma, Dwindwinaba, Esia,Yaya, Konkroma, Emire, Mango, Esakoko, Cocoa an...

ION BEAM ENERGY CALIBRATION OF THE 1.7 MV TANDEM ACCELERATOR AT GAEC

ABSTRACTParticle accelerators are often used for both ion implantation and ion beam analysis,therefore the accurate and precise knowledge of the energies of the accelerated ions isessential. From the analytical point of view, the energy of the accelerated ion needs to beknown with high precision which can only be achieved through calibration. Ghana AtomicEnergy Commission hosts a 1.7 MV tandem accelerator, at the Accelerator ResearchCentre (ARC). This facility uses ion beam techniques such as...

STUDY OF THE RADIOLOGICAL IMPACT OF SMALL-SCALE MINING ACTIVITIES AT DUNKWA-ON-OFFIN IN THE CENTRAL REGION, GHANA

ABSTRACTSmall-scale (and artisanal) mining has been defined differently around the world. However, in Ghana, small-scale (gold) mining is defined as ―mining (gold) by any method not involving substantial expenditure by an individual or group of persons not exceeding nine in number or by a co-operative society made up of ten or more persons‖. The activities in the mining sector have increased in recent times and as at 2008, a total of 212 mining companies were awarded mining leases and exp...