School of Pure and Applied Sciences: Recent submissions
Now showing items 61-80 of 170
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A Theoretical Model of Corruption Using Modified Lotka Volterra Model: A Perspective of Interactions between Staff and Students
(Journal of Advances in Mathematics and Computer Science, 2020)Corruption is the misuse of power or resources for private gain. This undermines economic development, political stability, and government legitimacy, the society fabric, allocation of resources to sectors crucial for ... -
Isolation of Haloalkaliphilic Fungi from Lake Magadi in Kenya
(Heliyon, 2020)In this study we explored the cultivable fungal diversity in Lake Magadi and their secondary metabolite production. Isolation was done on alkaline media (Potato dextrose agar, Malt extract agar, Oatmeal agar and Sabouraud ... -
A Deterministic Model Of HIV Transmission Between Two Closed Patches Incorporating The Monod Equation
(International Institute for Science, Technology and Education (IISTE), 2019-06)Among other factors, migration has significantly contributed to the spread of HIV. Recent studies have revealed that new infections occur along major transport corridors and truck-drivers have overall higher prevalence ... -
Effects of Temperature Dependent Viscosity and Viscous Dissipation on Fluid Flow Past a Moving Flat Plate
(International Journal of Innovative Science, Engineering & Technology (IJISET), 2016-12)In this study, the effects of temperature dependent viscosity and viscous dissipation on fluid flow over a moving flat isothermal plate have been investigated. A steady two dimensional laminar boundary layer flow of ... -
Modelling Miraa Addiction like a Disease Incorporating Voluntary Quitting
(Journal of Advances in Mathematics and Computer Science, 2017)This study presented a deterministic model of miraa addiction based on three compartmental classes incorporating miraaspecific attributes as well as the aspect of voluntary quitting. Our model was based on SIS ... -
Turbulent Natural Convection in an Enclosure at Varying Aspect Ratio
(International Institute for Science, Technology and Education (IISTE), 2017)Energy transfer mechanism in most technical flows is through turbulent natural convection due to low viscosity of the fluids used in technical applications. Consequently, there is need to establish the parameters that ... -
Turbulent Natural Convection in an Enclosure at Varying Rayleigh Number
(International Journal of Science: Basic & Applied Research, 2017)Most fluids used in technical applications are of low viscosity; hence, fluid flows encountered in engineering applications are mostly turbulent. Parameters that influence the distribution of the ... -
Synergistic Evaluation of Selected Plant Extracts on Potency of Pyrethrins against the Maize Weevil, Sitophilus zea-mais (MOTSCH.)
(Merit Research Journals, 2020-11)The interest in utilization of botanical insecticides, particularly essential oils have become increasingly relevant in the control of insect pests. Many plant products and their bioactive compounds with repellent, antifeeding ... -
Screening of Plant Extracts Possessing Methylenedioxyphenyl (MDP) Group as Potential Synergists in Insecticide Formulations using the Maize Weevil, Sitophilus Zea-mais (Motsch.)
(Merit Research Journals, 2020)Synergists are compounds that are either negligibly toxic or non-toxic to insects when applied on their own, but enhance the efficacy of an insecticide. Many insects are able to detoxify insecticide molecules and survive ... -
Velocity Profiles of Unsteady Blood Flow through an Inclined Circular Tube with Magnetic Field
(Journal of Advances in Mathematics and Computer Science, 2017)The present paper is devoted to study the flow of incompressible viscous, electrically conducting fluid (blood) in a rigid inclined circular tube with magnetic field. The blood is considered to be Newtonian fluid and the ... -
Physicochemical Properties of Hydrated Portland Cement Blended with Rice Husk Ash
(Hindawi, 2020)In the presence of significant quantities of carbon dioxide (CO2) and elevated temperatures in the atmosphere due to climate change, cement-based materials are susceptible to carbonation. Blended cements are more prone to ... -
Induction of Complete Courtship Ritual in Amblyomma Cajennense Using 2, 6-Dichlorophenol at Female-Equivalent Quantities
(2011)In order to clarify the role of 2,6-dichlorophenol (2,6-DCP) in the courtship of Amblyomma cajennense, sexually mature males that had previously fed on rabbits were tested in bioassays. The males were released onto dummies ... -
Thermal Resistivity of Chemically Activated Calcined Clays-Based Cements
(Springer, 2017)The study investigated the effects of selected potential chemical activators on thermal resistivity of calcined clay based cement mortars. 0.5 M Na2SO4 and 0.5 M NaOH were used as activator solutions. The chemical composition ... -
Potential for Selected Kenyan Clay in Production of Limestone Calcined Clay Cement
(Springer, 2020)The potential for calcined clay, and in particular Limestone Calcined Clay Cement (LC3), to be used in concrete in Kenya was examined in this study. Locations of clay sources and existing mining infrastructure were examined ... -
Performance of Ground Clay Brick Mortars in Simulated Chloride and Sulphate Media
(Hindawi, 2019)The durability of cement-based structures majorly depends on their resistivity to the aggressive media in the construction environment. The most aggressive ions commonly encountered in construction environment are chloride ... -
Effect of Sulphate and Chloride Ingress on Selected Cements Mortar Prisms Immersed in Seawater and Leather Industry Effluent
(Hindawi, 2019)Cement structures are major capital investments globally. However, exposure of cement-based materials to aggressive media such as chloride- and sulphate-laden environments such as coastal areas affects their performance. ... -
Physicochemical Performance of Portland-Rice Husk Ash-Calcined Clay-Dried Acetylene Lime Sludge Cement in Sulphate and Chloride Media
(ResearchGate GmbH, 2019)This paper reports leach and/or intake of SO42−, Cl−, Ca2+, Na+, and K+ from and/or into cement mortar cubes made from a novel cementious material in naturally encountered environmental simulated media. The paper also ... -
Pyroprocessing and the Optimum Mix Ratio of Rice Husks, Broken Bricks and Spent Bleaching Earth to Make Pozzolanic Cement
(Elsevier, 2019)This paper presents the findings of an experimental investigation on optimizing pozzolanic activity of a blend of Rice Husks (RH), Spent Bleaching Earth (SBE) and Broken Bricks (BB) to form pozzolana that would have ... -
Chloride Ingress in Chemically Activated Calcined Clay-Based Cement
(Elsevier, 2018)Chloride-laden environments pose serious durability concerns in cement based materials. This paper presents the findings of chloride ingress in chemically activated calcined Clay-Ordinary Portland Cement blended mortars. ... -
Effects of Biocementation on some Properties of Cement-Based Materials Incorporating Bacillus Species Bacteria
(Taylor & Francis, 2019)There is a growing need in the construction industry to improve transfer and durability aspects of Portland pozzolana cement. Ureolytic bacteria have recently emerged as potential micro-organisms well known for precipitation ...