Browsing School of Pure and Applied Sciences by Title
Now showing items 118-137 of 170
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Regioselective reactions of electrophilic iron dicarbonyl cations, [(η5-C5R5)(CO)2Fe]+ (R = H, CH3) with heterofunctional amine ligands
(Elsevier, 2012)The reactions of the ether salts [(η5-C5R5)(CO)2Fe(E)]BF4, (R = H, E = Et2O; R = CH3, E = THF) with various ligands possessing two different coordination sites have been investigated. It was established that [(Cp(CO)2Fe(OEt2)]BF4 ... -
Relativistic Dynamics in a Matter-Dominated Friedmann Universe
(Springer India, 2017)The energy density of the universe is estimated to be composed of 68% dark energy. Dark energy is associated with the accelerated expansion of the universe. In this work, we consider the evolution of the number density ... -
Resilience of soils and vegetation subjected to different grazing intensities in a semi-arid rangeland of Kenya
(Taylor & Francis, 1997)The resilience of rangeland soils and vegetation to different levels of grazing is still poorly understood. A study was conducted to determine the recovery of a rangeland grazed at different intensities and allowed a ... -
Review of Carbonation Resistance in Hydrated Cement Based Materials
(Elsevier, 2019)Blended cements are preferred to Ordinary Portland Cement (OPC) in construction industry due to costs and technological and environmental benefits associated with them. Prevalence of significant quantities of carbon dioxide ... -
Review of Clay-Based Nanocomposites as Adsorbents for the Removal of Heavy Metals
(Hindawi, 2022-06-22)Due to rapid industrialization, urbanization, and surge in modern human activities, water contamination is a major threat to humanity globally. Contaminants ranging from organic compounds, dyes, to inorganic heavy metals ... -
A Review on Pyroprocessing Techniques for Selected Wastes Used for Blended Cement Production Applications
(Elsevier, 2020)Pyroprocessing is an important stage in cement manufacturing. In this process, materials are subjected to high temperatures so asto cause a chemical or physical change. Its control improves efficiency in energy utilization ... -
Robust Classification through a Nonparametric Kernel Discriminant Analysis
(Scientific Research Publishing, 2022-08-10)The problem of classification in situations where the assumption of normality in the data is violated, and there are non-linear clustered structures in the dataset is addressed. A robust nonparametric kernel discriminant ... -
Robust Estimation of Finite Population Totals Using a Model Based Approach in the Presence of Two Auxiliary Variables
(International Journal of Data Science and Analysis, 2018)The utilization of auxiliary information during surveys increases the accuracy of estimators, thereby giving more reliable estimates of the population parameters of interest. It has been established that the presence of ... -
Robust estimation of the error variance of the ratio estimator
(Egerton Journal of Humanities, Social Sciences and Education, 1999) -
ROBUST ESTIMATION OF VARIANCE IN THE PRESENCE OF NEAREST NEIGHBOUR IMPUTATION
(African Journal of Science and Technology, 2003)The problem of estimating the variance of an estimator of the population total when missing values have been filled using a Nearest Neighbour (NN) imputation method is considered. The estimator is developed assuming a more ... -
Robust estimation of variance in the presence of nearest neighbour imputation
(African Network of Scientific and Technical Institutions (ANSTI), 2003)The problem of estimating the variance of an estimator of the population total when missing values have been filled using a Nearest Neighbour (NN) imputation method is considered. The estimator is developed assuming a more ... -
Robust Variance Estimation by Linearization Techniques for Poverty Indicators
(Southern Africa Mathematical Sciences Association, 2018)The need for a reliable and equitable means of measuring population disparity and providing guidelines on implementation of policy decisions has necessitated the search for a precise estimating scheme for poverty indicators. ... -
Schwarzschild solution of the modified Einstein field equations
(2017)A reformulation of the Schwarzschild solution of the linearized Einstein field equations in post-Riemannian Finsler spacetime is derived. The solution is constructed in three stages: the exterior solution, the event-horizon ... -
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 ... -
Seasonal time series data imputation: comparison between feed forward neural networks and parametric approaches
(JKUAT Press Ltd, 2005)Missing data in a time series may be an obstacle that may prevents further analysis of the available series either for control, explanations or forecasting. This paper addresses the problem of "‘filling in"' missing data ... -
Seasonal time series forecasting: A comparative study of ARIMA and ANN models
(African Journal of Science and Technology (AJST), 2004)This paper addresses the concerns of Faraway and Chatfield (1998) who questioned the forecasting ability of Artificial Neural Networks (ANN). In particular the paper compares the performance of Artificial Neural Networks ... -
A SEMI-PARAMETRIC MULTIPLICATIVE BIAS REDUCTION DENSITY WITH A PARAMETRIC START
(Pushpa Publishing House, 2018)In this study, a multiplicative semiparametric fourth order bias reduction density is proposed. The proposed density accommodates all parametric distributions and produces optimum results even in situations where the ... -
A Simple Stochastic Stomach Cancer Model with Application
(Science Publishing Group, 2018-04)Survival analysis majors mainly on estimation of time taken before an event of interest takes place. Time taken before an event of interest takes place is a random process that takes shape overtime. Stochastic processes ... -
Simulation of a Deterministic Model of HIV Transmission between Two Closed Patches
(Journal of Advances in Mathematics and Computer Science, 2020)Numerical simulation of a deterministic model of HIV transmission between major cities in Kenya is carried out. The model considered two closed patches connected by the commuter movements of truck drivers being the agents ...