School of Pure and Applied Sciences: Recent submissions
Now showing items 1-20 of 259
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Reduction and Degradation of Paraoxon in Water Using Zero-Valent Iron Nanoparticles
(MDPI, 2022-08-02)Paraoxon is an emerging organophosphate pollutant that is commonly used as a pesticide and a drug, hence increasing the risk of contamination of water supplies. Its intensive use for vector control has led to pollutions ... -
Synthesis of mesoporous akaganeite functionalized maize cob biochar for adsorptive abatement of carbamazepine: Kinetics, isotherms, and thermodynamics
(Elsevier, 2022-09-01)In this work, akaganeite (β-FeO(OH)) impregnated maize cob biochar (Fe-MCB) was prepared by direct hydrolysis, and its adsorptive potential was tested against aqueous solutions of carbamazepine (CBZ), an emerging contaminant. ... -
Performance of a horizontal well in a bounded anisotropic reservoir: Part II: Performance analysis of well length and reservoir geometry
(De Gruyter Open Access, 2023-06)Evaluation of the performance of horizontal wells is an important aspect in the enhancement of their productivity. This study provides mathematical computations, and analysis for theoretical well and reservoir considerations. ... -
Mathematical Modelling of the Effects Funding on HIV Dynamics Among Truckers and Female Sex Workers Along the Kenyan Northern Corridor Highway
(2022)The Southern and Eastern parts of Africa are the most hit by HIV/AIDS in the world and a huge financial commitment is required to control the spread of the disease. Of these countries, Kenya and South Africa have been able ... -
Male Circumcision: A Means to Reduce HIV Transmission between Truckers and Female Sex Workers in Kenya
(2022-06)Kenya records over 1.5 million cases of HIV-infected people with a prevalence of 4.8% among adults in 2019, ranking Kenya as the seventh-largest HIV population in the world. A recent study showed that 55.9% of Kenyan ... -
Car Antifreeze and Coolant: Comparing Water and Ethylene Glycol as Nano Fluid Base Fluid
(2018-06)Most internal combustion engines are fluid cooled using liquid coolants mostly water and ethylene glycol, whose heat transfer capabilities are limited. An alternative for improving their thermophysical properties is the ... -
Elliptic Curve Digital Signatures and Their Application in the Bitcoin Crypto-currency Transactions
(2017-10)The Elliptic Curve Digital Signature Algorithm (ECDSA), defines a technique for generating and validating digital signatures. We start by reviewing the mathematics behind the Digital Signature Algorithm (DSA) and its ... -
The efect of various fuels on the yield, structural and optical properties zinc zirconate nanocomposite
(Springer Berlin Heidelberg, 2020)Various types of fuels were used in a low-temperature solution combustion synthesis of zinc zirconate nanocomposite at a pH of 7. In the synthesis, the fuels used were citric acid, glycine, urea, hydrazine hydrate, and ... -
Investigation of the effect of precursor ratios on the solution combustion synthesis of zinc zirconate nanocomposite
(Elsevier, 2019)Zinc zirconate nanocomposite was synthesized by a low-temperature solution combustion method using citric acid as fuel at a pH of 7. The synthesis was done by varying the ratios of zirconium butoxide and zinc nitrate, which ... -
Structural and optical characteristics of dysprosium-doped zinc zirconate nanocomposites
(Optica Publishing Group, 2020-09)Zinc zirconate nanocomposites with varying compositions of Dy3+ ions were synthesized through a solution combustion method using citric acid as a fuel. There were mixed hexagonal ZnO and cubic ZrO2 phases in the X-ray ... -
“God Didn’t Make a Mistake in Creating Me”: Intrapersonal Resilience Processes among Gay and Bisexual Male Youth in Kenya
(MDPI, 2021)Gay and bisexual male youth in Kenya experience human rights violations, including pervasive stigma and discrimination, and these oppressive forces are associated with elevated rates of mental health concerns. Despite ... -
Growth performance of Nile Tilapia (Oreochromis niloticus) fi ngerlings fed with water spinach (Ipomoea aquatica) diets
(Ann Mar Sci., 2022-04)Nile tilapia (Oreochromis niloticus) are herbivores with longer coiled intestines compared to carnivores; mouth characteristics necessary for plant shredding. Hence, several studies have been conducted to replace feed ... -
Biodigester attribute tradeoffs among farmers in Kiambu and Machakos Counties, Kenya
(SSRN, 2022-04)The diffusion of biodigester technology can contribute support towards the achievement of the global goals brokered under the auspices of the United Nations. They have been promoted among farmers but low adoption remains ... -
Electrochemical detection of dioctyl phthalate using molecularly imprinted polymer modified screen-printed electrodes
(Elsevier, 2022)We report the investigation of electropolymerised molecularly imprinted polymers (E-MIPs) for the determination of dioctyl phthalate (DOP). Low-cost and eco-friendly commercially available screenprinted electrodes (SPEs) ... -
Lactic Acid Bacteria from African Fermented Cereal-Based Products: Potential Biological Control Agents for Mycotoxins in Kenya
(Journal of Toxicology, 2022)Cereals play an important role in global food security. Data from the UN Food and Agriculture Organization projects increased consumption of cereals from 2.6 billion tonnes in 2017 to approximately 2.9 billion tonnes by ... -
Enhanced hexazinone degradation by a Bacillus species and Staphylococcus species isolated from pineapple and sugarcane cultivated soils in Kenya
(Environmental Chemistry and Ecotoxicology, 2022)In this work, hexazinone-degrading bacterial strains from Kenyan tropical soils with long term application history were isolated and identified. Non-sterile soils from sugarcane and pineapple cultivated fields with over ... -
Advances in sample pretreatment and detection of PCBs in the environment
(Journal of Hazardous Materials Advances, 2021)Pollution of the environment by polychlorinated biphenyls (PCBs) continues to be a global concern because of their toxicity, persistence, long-range transport properties and ability to bioaccumulate in fatty tissues. PCBs ... -
Nilpotent covers of symmetric and alternating groups
(2020)We prove that the symmetric group Sn has a unique minimal cover M by maximal nilpotent subgroups, and we obtain an explicit and easily computed formula for the order of M. In addition, we prove that the order of M is ... -
Photometric sensing of heavy metal ions using a naphthoquinodimethyl-bis-thioamide dye: Selectivity & photophysics of the metal organic complexes
(Elsevier, 2022)As Mother Nature is experiencing catastrophic environmental pollutions from both natural sources and anthropogenic activities, many scientists have been working around the clock to develop environmentally benign and ... -
Estimation of Conditional Weighted Expected Shortfall under Adjusted Extreme Quantile Autoregression
(Scientific Research Publishing Inc., 2021-07-14)In this paper, we present an estimator that improves the well-calibrated coherent risk measure: expected shortfall by restructuring its functional form to incorporate dynamic weights on extreme conditional quantiles used ...
