Abstract The mathematical study of human pulse wave was studied with the view to gaining an insight into physiological situations. Fluid-Structure Interaction (FSI) in blood flow is associated with pressure pulse wave arising from ventricular ejection. Solution of the coupled system of non-linear PDEs that arose from the FSI was sought in order to determine pressure. Further study on pressure pulse waves showed that the Korteweg-de Vries (KdV) equations hold well for the propagation of nonl...
ABSTRACT Bacteriological and physicochemical properties of drinking water (tap, well and borehole) in Sokoto metropolis were investigated to determine the level of contamination and the persistence of target organisms. A total of 270 samples comprising of 90 well water samples, 90 tap water samples and 90 boreholes water samples were obtained from some parts of Sokoto metropolis and analyzed using standard procedures. Total coliform count, heterotrophic plate count, physico-chemical prop...
ABSTRACT In this dissertation, the problems of Magnetohydrodynamic unsteady free convection flow past vertical porous plates with suction and oscillating boundaries are studied. The linear and nonlinear partial differential equations governing the flow problems and boundary conditions were transformed into dimensionless form, and the perturbation techniques applied in getting analytical solutions for the velocity, temperature, the skin friction coefficient and Nusselt number. It was obse...
ABSTRACT The composition and bleaching properties of Nteje clay in comparison with two commercially available adsorbents (activated carbon and fuller’s earth) were investigated to study its competence for use as an alternative to high cost imported adsorbents. The modification of the raw clay sample was carried out by acid activation to enhance the surface area of the clay by exchange of octahedral cations e.g Al3+, Fe3+ and Mg2+ with H+ ions which led to the modification of the clay cryst...
Abstract -. "Since. statisticians do not usually perform an experiment, their claim to attention when they write on experimentation requires some explanations", William Cochran and Gertrude Cox (1957). Block designs are widely used in many fields of research. Their most common type is the randomized (complete) block design. It is not applicable in all circumstances. If the numbers of (elements are too large to preserve homogeneous conditions within complete blocks or the sizes of blocks are d...
ABSTRACT Rampant cyber incidences in Kenya targeting banks call for mediations beyond existing cybersecurity principles. This quantitative study sought to collate multi-domain variables from previous works to develop a framework for measuring cyber-resilience in Kenyan banks known as the Cyber-resilience Framework for Banks (CRF4Banks). The framework consists of eight key cyber-resilience constructs and their constituent variables, identified from empirical research and literature. Cyber-res...
ABSTRACT The search for more hydrocarbons in some old fields in the onshore and shelf parts of the Niger Delta Basin is gradually becoming a major avenue for increasing the nation’s reserves. Some asset teams now have new mandates to re-evaluate key hydrocarbon reservoirs in such fields for effective optimization and production. The major reason for the re-evaluation is that some of the reservoirs between the Late Eocene and Early Oligocene (34.0 Ma and 31.3 Ma) were wrongly tagged and ma...
ABSTRACT Infectious diseases have become problematic throughout the world, threatening individuals who come into contact with pathogens responsible for transmitting diseases. Pneumoccocal pneumonia, a secondary bacterial infection follows an influenza A infection, responsible for morbidity and mortality in children, elderly and immuno–comprised groups. The aims of this Thesis are to; develop a mathematical model for within–host co–infection of influenza A virus and pneumococcus, model ...
The performance of an enterprise is determined by its strategic objectives, and the strategic plan it adopts through some form of strategic analysis in order to meet these objectives. However, strategic analysis is currently only supported through unsystematic and informal processes such as SWOT analysis and the Five Forces Model. This thesis proposes conceptual goal modeling as a systematic approach to strategic analysis and shows through a comparative study how this analysis can be conducte...
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 carried out aro...
ABSTRACT The synthesis of five mono- and five bis-alkynylated derivatives of quinoline-5,8-diones is reported. The intermediate 6,7-dibromoquinoline-5,8-dione was obtained by nitrosation of 8- hydroxyquinoline, followed by reduction and subsequent bromination and oxidation. The coupling reaction of 6,7-dibromoquinoline-5,8-dione via palladium-catalyzed Sonogashira cross-coupling gave the alkynylated products. The chemical structures of the products were confirmed using spectroscopic methods ...
ABSTRACT The potentials of Adansonia digitata root (ADRP) and stem powders (ADSP) and the stem activated carbon (ADSAC) for adsorption of Pb2+, Cd2+, Cu2+ and Co2+ from aqueous solutions were investigated. The activated carbon was prepared via chemical activation using ZnCl2 as the activating agent. Physico-chemical analysis of the adsorbents (ADRP, ADSP and ADSAC) showed the moisture contents (< 20 %), volatile matter (9.2 - 11.2 %), ash content showed < 5.0 %, fixed carbon (68 - 81.0 %...
ABSTRACT Accurate meter readings, timely and correct bills have become an important aspect of water metering systems. Additionally, anomalies such as leakage and bursts in water pipelines have significant consequences to the environment and lead to financial constraints to the water companies. Since monitoring leakages and bursts in the water distribution networks, capturing accurate and dependable measurements for billing, troubleshooting and analysis is a challenging task, the need to deve...
Abstract Bush encroachment is a form of land degradation common predominantly in semi-arid areas of the world. The resulting habitat degradation and loss of resource productivity make bush encroachment a serious environmental and economic problem in Namibia. Despite these negative effects, bush encroachment offers potential woody carbon stock storage, which can render Namibia a net carbon sink. This study was, therefore, aimed at quantifying potential woody carbon stock storage from differen...
ABSTRACT The synthesis and characterization, spectroscopic, and biological studies of 2-acetylferrocenyl-4- phenylthiosemicarbazone, 2-acetylferrocenyl-4-methylthiosemicarbazone, 2-acetylpyridine-2- thiophenecarboxylsemicarbazone and 2-acetylferrocenyl-2-thiophenecarboxylsemicarbazone with copper(II) chloride are reported here. The ligands were synthesized by condensation reaction of appropriate carbonyl and amine compounds. The reactions were carried out in the presence of acetic acid. The ...