School of Pure and Applied Sciences: Recent submissions
Now showing items 221-240 of 259
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A Fumonisins Immunosensor Based on Polyanilino-Carbon Nanotubes Doped with Palladium Telluride Quantum Dots
(2014-12-24)An impedimetric immunosensor for fumonisins was developed based on poly(2,5-dimethoxyaniline)-multi-wall carbon nanotubes doped with palladium telluride quantum dots onto a glassy carbon surface. The composite was assembled ... -
Multi-walled carbon nanotubes: innovative sorbents for pre-concentration of polychlorinated biphenyls in aqueous environments
(RSC, 2015-07-21)Carbon nanotubes (CNTs) have demonstrated outstanding chemical and mechanical stability, electrical properties, and strong interactions with aromatic compounds owing to the p-electron system on the graphene sheets. Taking ... -
An alternative clean-up column for the determination of polychlorinated biphenyls in solid matrices
(RSC, 2015-11)The need for continuous monitoring of polychlorinated biphenyls (PCBs) has necessitated the development of analytical techniques that are sensitive and selective with minimal reagent requirement. In light of this, ... -
Suitability of Athi River Water for Irrigation within Athi River Town and Its Environs
(Science Domain, 2016)Aims: To assess the suitability of the Athi River water for irrigation in Athi River area and its environs. Study Design: The study design was purposive with sampling points deliberately chosen to assess the water quality ... -
Molecularly imprinted polymers for the analysis and removal of polychlorinated aromatic compounds in the environment: a review
(RSC, 2016)Synthetic receptors and in particular molecularly imprinted polymers (MIPs) are gaining relevance as selective sorbent materials and biomimetic recognition elements for analyzing polychlorinated aromatic compounds (PACs) ... -
Synthesis of stationary phases that provide group recognition for polychlorinated biphenyls by porogenic fragment template imprinting
(WILEY, 2015)Molecular recognition based on imprinted polymers results from the polymerization of functional monomers and cross-linkers in the presence of a target analyte (i.e. template), with subsequent removal of the template to ... -
An Application Of Extreme Value Theory In Modelling Electricity Production In Kenya
(IISTE, 2014)Extreme Value Theory provides a well-established statistical model for the computation of extreme risk measure which includes, Value at Risk and Expected Shortfall. In this paper we apply Univariate Extreme Value Theory ... -
Measuring Financial Risk in Stock Returns: A Case of Nairobi Stock Exchange
(International Journal of Science and Research (IJSR), 2014-04)Value-at-Risk is an important concept in financial management, financial reporting and risk management. In this study, we have used this tool to assess risk in stocks listed in the Nairobi Stock Exchange. It is commonly ... -
On the Estimation and Properties of Logistic Regression Parameters
(IOSR Journal, 2014)Logistic regression is widely used as a popular model for the analysis of binary data with the areas of applications including physical, biomedical and behavioral sciences. In this study, the logistic regression model, ... -
Conditional Volatility Estimation by Conditional Quantile Autoregression
(HIKARI Ltd, 2014)This paper considers the problem of estimating conditional volatility function using conditional quantile autoregression function. We estimate the interquantile autoregression range and the conditional volatility function ... -
Assessment of photo-oxidative alterations to natural organic matter in water using fluorescence excitation emission matrices and liquid chromatography-organic carbon detection techniques
(RSC, 2015)Fluorescence excitation emission matrices (FEEMs) and liquid chromatography-organic carbon detection (LC-OCD) are relatively novel techniques currently used for analysing natural organic matter (NOM) in water. Regardless ... -
Zn and Pb marking of Ca binding to humic substances and PHREEQC speciation simulations
(IWA Publishing, 2016)Power generating companies using and recycling cooling water usually experience deposition of insoluble salts on pipes carrying the water, leading to scaling problems. By controlling parameters that optimize competitive ... -
MODELLING THE VOLATILITY OF EXCHANGE RATES IN RWANDESE MARKETS
(European Centre for Research Training and Development UK, 2014-12)This work applied Generalized Autoregressive Conditional Heteroskedasticity (GARCH) approach to modelling volatility in Rwanda Exchange rate returns. The Autoregressive (AR) model with GARCH errors was fitted to the daily ... -
ESTIMATION OF EXTREME VALUE AT RISK IN RWANDA EXCHANGE RATE
(European Centre for Research Training and Development UK, 2014-12)Estimating the probability of rare and extreme events is a crucial issue in the risk estimation of exchange rate returns. Extreme Value Theory (EVT) is a well-developed theory in the field of probability that studies the ... -
Modeling export price of tea in Kenya: Comparison of artificial neural network and seasonal autoregressive integrated moving average
(Science Publishing Group, 2014-12-19)Agriculture sector is a key driver of economic growth in Kenya. It remains the main source of livelihood for the majority of the Kenyan people. Tea, coffee, and horticulture are the main agricultural exports in Kenya. ... -
Capture, isolation and electrochemical detection of industrially-relevant engineered aerosol nanoparticles using poly (amic) acid, phase-inverted, nano-membranes
(Elsevier, 2014-08-30)Workplace exposure to engineered nanoparticles (ENPs) is a potential health and environmental hazard. This paper reports a novel approach for tracking hazardous airborne ENPs by applying online poly (amic) acid membranes ... -
A numerical solution to estimate hydro-geologic parameters of a fractured geothermal porous medium based on fluorescein thermal decay correction
(Elsevier, 2014-07)A numerical solution to model the flow of fluorescein tracer in a fractured, high temperature geothermal system is presented. This study was carried out in Olkaria, Kenya. Results show that correcting for fluorescein ... -
Predictive complexation models of the impact of natural organic matter and cations on scaling in cooling water pipes: A case study of power generation plants in South Africa
(Elsevier, 2014)This work discusses simulative models of Ca and Mg complexation with natural organic matter (NOM), in order to control the incidence of scaling in pipes carrying cooling water at the Eskom power generating stations in ... -
Amplification of the discharge current density of lithium-ion batterieswith spinel phase Li(PtAu)0.02Mn1.98O4nano-materials
(Elsevier, 2014)In this study the synergistic and catalytic properties of a novel nano-composite cathode material ofnominal composition Li(M)xMn2-xO4(M = Pt-Au; x # 0.2) has been explored. Li(PtAu)xMn2-xO4nano-material for use in lithium-ion ... -
In - situ Electrochemical Synthesis, Microscopic and Spectroscopic Characterisations of Electroactive poly(2,5-dimethoxyaniline) – Multi-Walled Carbon Nanotubes Composite Films in Neutral Media
(International Journal of ELECTROCHEMICAL SCIENCE, 2014-09-29)Poly(2,5- dimethoxyaniline)-multi-wall carbon nanotubes (PDMA-MWCNT) nanocomposite films were synthesised by in –situ electrochemical polymerisation. The films were characterised by cyclic voltammetry (CV), ultra–visible ...
