Browsing School of Pure and Applied Sciences by Title
Now showing items 111-130 of 170
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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 ... -
Prediction of Compressive Strength of Calcined Clay Based Cement Mortars Using Support Vector Machine and Artificial Neural Network Techniques
(Research Gate, 2020)Prediction of strength in cement based materials is vital in construction industry as it forms the basis upon which important tasks can be performed such as the time for mortar form removal, project scheduling and quality ... -
Prediction of the likelihood of Households Food Security in the Lake Victoria Region of Kenya
(Pakistan Journal of Statistics and Operation Research, 2011)This paper considers the modeling and prediction of households food security status using a sample of households in the Lake Victoria region of Kenya. A priori expected food security factors and their measurements are ... -
Preparation and Chemical/Microstructural Characterization of Azacrown Ether-Crosslinked Chitosan Films
(Multidisciplinary Digital Publishing Institute, 2017)Chemically stable porous azacrown ether-crosslinked chitosan films were prepared by reacting varying molar amounts of N,N-diallyl-7,16-diaza-1,4,10,13-tetraoxa-dibenzo-18-crown-6 (molar equivalents ranging from 0, 0.125, ... -
Preparation of tervalent molybdenum complexes and a study of their reduction by zinc under low pressure of carbon monoxide
(Kenyatta University, 2011)Previously, molybdenum hexacarbonyl, MO(CO)6 has been prepared by reduction of highoxidation state molybdenum compounds such as MoCls under high pressure (60-100atm.) and temperature (20-1000C), carbonylation of metal oxide ... -
Pricing of European call options using generalized Wishart processes
(Mathematics and Systems Science, 2023)This study explores a multiple-security, high-risk pricing model where the implied volatility has been portrayed through Generalized Wishart affine processes. The presence of dual dependency matrices distinctively characterizes ... -
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 ... -
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. ...