Browsing School of Pure and Applied Sciences by Issue Date
Now showing items 81-100 of 259
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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 ... -
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 ... -
A numerical analysis of unsteady inflow wind for site specific vertical axis wind turbine: A case study for Marsabit and Garissa in Kenya
(Elsevier, 2014)Most of the wind analysis studies have been conducted under steady wind conditions. The study of real unsteady wind environment, however, is still an open-ended research question. This is attributable to the existing ... -
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 ... -
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 ... -
Comparison of Godunov’s and Relaxation Schemes Approximation of Solutions to the Traffic Flow Equations
(International Journal of Scientific and Innovative Mathematical Research, 2014)In this paper we deal with the study of the traffic flow model that is governed by two hyperbolic equations. By analysing the equations we obtain two real and distinct eigen values which enables us to determine the wave ... -
Salary Determinants for Higher Institutions of Learning in Kenya
(2014)There has been a debate over the years on which category of salary determinants best predicts an employee salary, that is, whether it is organizational characteristics or individual attributes. This study adopts a hybrid ... -
Graphenated tantalum (IV) oxide and poly (4-styrene sulphonic acid)-doped polyaniline nanocomposite as cathode material in an electrochemical capacitor
(Pergamon, 2014)Nanostructured poly(4-styrene sulphonic acid) and tantalum (IV) oxide-doped polyaniline nanocomposite were synthesised and their electro-conductive properties were determined. The oxide was synthesized using a modified ... -
Nanostructured Membranes for Water Purification
(2014)Nanoscale materials can be used to achieve wastewater purification, desalination, and inactivation of pathogenic bacteria and viruses, as well as for the adsorption and/or degradation of contaminants [1 16]. The development ... -
Catalytic Reduction of Hexavalent Chromium using Nanostructured Polyamic Acid
(American Chemical Society, 2014)This paper provides a survey of conventional and emerging techniques that are available for characterizing engineered nanoparticles in complex matrices. Techniques that were considered include microscopy (TEM, SEM, HRTEM, ... -
Isolation and Identification of Hexazinone-Degrading Bacterium from Sugarcane-Cultivated Soil in Kenya
(Springer US, 2014)The s-triazine herbicide hexazinone [3-cyclohexyl-6-dimethylamino-1-methyl-1,3,5-triazine-2,4(1H,3H)- dione], is widely used in agriculture for weed control. Laboratory biodegradation experiments for hexazinone in ... -
Sediment Accumulation in Fish Ponds; Its Potential for Agricultural Use
(2014)ABSTRACT An experiment was conducted at the World Fish Center in Egypt, to describe and quantify sediment and nutrient accumulation in semi-intensive tilapia ponds, evaluate the effect of input type and stocking density ... -
Interaction between the Linear and Nonlinear Polarization in Optical Fibre
(2014)Interaction between polarization mode dispersion (PMD) and nonlinear induced birefringence in a fibre with consideration of mode coupling has been investigated theoretically using Matlab and Optism. The investigations show ... -
Green Remediation of Hexavalent Chromium Using Naturally Derived Flavonoids and Engineered Nanoparticles
(2014)Contaminated ground- and surface water supplies such as the municipalities, wells, lakes, and rivers exhibit various levels of contamination that can pose numerous health risks. The release of contaminants into the environment ... -
Graphenatedtantalum(IV)oxideandpoly(4-styrenesulphonicacid)-dopedpolyanilinenanocompositeascathodematerialinanelectrochemicalcapacito
(Pergamon, 2014)Nanostructuredpoly(4-styrenesulphonicacid) and tantalum(IV)oxide-doped polyaniline nano composite were synthesized and their elector-conductive properties were determined.The oxide was synthesized using a modified sol gel ... -
Estimation of Risk in Rwanda Exchange Rate
(2014)Generalized Autoregressive Conditional Heteroskedasticity (GARCH) approach was applied to Rwanda Exchange rate returns to estimating current volatility. We fitted autoregressive (AR) model with GARCH errors to the daily ... -
Nonparametric Estimates for Conditional Quantiles of Time Series
(2014)We consider the problem of estimating the conditional quantile of a time series fYtg at time t given covariates Xt , where Xt can either exogenous variables or lagged variables of Yt . The conditional quantile is ... -
Financial Literacy and Retirement Planning in the Informal Sector in Kenya
(2014)Old age dependency has become a major issue of concern to governments today. This is because a large number of retirees lack any form of regular income to sustain them in retirement. Kenya has one of the highest levels ... -
Analysis of Head Loss in Pipe System Components: Quasi-one-Dimensional Nozzle Flow
(2014)The problem under investigation is to determine the flow-field variables that is the total head which is the sum total of Elevation head, velocity head and pressure head instantaneous distributions as ...