Browsing School of Pure and Applied Sciences by Title
Now showing items 192-211 of 259
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On Local Linear Regression Estimation of Finite Population Totals in Model Based Surveys
(American Journal of Theoretical and Applied Statistics, 2018) -
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, ... -
Optimal Investment Strategy under Stochastic Interest Rates
(Scientific Research Publishing, 2017)We study how firms’ management can make effective investment decision under the influence of random interest rates. We define the threshold interest rate value below which investment can be effectively done and above ... -
Optimal threshold determination based on the meanexcess plot
(Taylor and Francis Group, 2019)Choosing a suitable threshold has been an issue in practice. Based on the mean excess plot (MEP), the eyeball inspection approach(EIA) is mainly used to determine the threshold. This involves fitting the threshold at the ... -
Optimization of Oyster Mushroom Yield By Using Simplex-Centroid Mixture Design
(Journal of Scientific Research and Innovative Technology, 2020)Despite the increased recognition of the nutritional value of the Oyster mushroom, coupled with its ability to tolerate a wide range of climatic conditions, its production is still at infancy stage with low adoption rate ... -
Organochlorine pesticide residues in sediment and water from NairobiRiver, Kenya: levels, distribution, and ecological risk assessment
(Environmental Science and Pollution Research, 2018)Production and use of most organochlorine pesticides (OCPs) was banned through the Stockholm Convention on persistentorganic pollutants. However, appreciable amounts are still detected in the environment due to their ... -
Organochlorine Pesticides Residues in Lake Naivasha Catchment Water
(2017)Lake Naivasha, Kenya, hangs precariously in balance between economic exploitation and biodiversity conservation. There is increasing intensity of horticultural activities around the lake, believed to result in excessive ... -
Participatory investigations of bovine trypanosomiasis in Tana River District, Kenya
(Blackwell Science Ltd, 2002-04-04)Participatory research on bovine trypanosomiasis was conducted with Orma pastoralists in Tana River District, Kenya. The use of participatory methods to understand local perceptions of disease signs, disease causes, disease ... -
Performance Comparison between the Traditional Intensity Modulation Direct Detection and Coherent Detection in a High Speed Optical Fibre Communication System
(2015)Passive optical networks (PONs) have become a dominant approach for the fibreto–the-home (FTTH) network deployments. Reliable and spectral efficient technologies are a necessity for extending the unamplified transmission ... -
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. ... -
The Performance of Step-Wise Group Screening Designs
(Sultan Qaboos University, 2015)In this paper we evaluate the performance of step-wise group screening designs in which group-factors contain an equal number of factors in the initial step. A usual assumption in group screening designs is that the ... -
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 ... -
A Poisson-Gamma Model for Zero Inflated Rainfall Data
(Hindawi, 2018)Rainfall modeling is signifcant for prediction and forecasting purposes in agriculture, weather derivatives, hydrology, and risk and disaster preparedness. Normally two models are used to model the rainfall process as a ... -
A Poisson-Gamma Model for Zero Inflated Rainfall Data
(Hindawi, 2018)Rainfall modeling is significant for prediction and forecasting purposes in agriculture,weather derivatives,hydrology,and risk and disaster preparedness.Normally two models are used to model the rainfall process as a chain ... -
Polarization Converter with Controllable Birefringence Based on Hybrid All-Dielectric-Graphene Metasurface
(Nanoscale Research Letters, 2018)Previous studies on hybriddielectric-graphenemetasurfaceshavebeenusedtoimplementinducedtransparency devices,while exhibiting high Q-factors based on trapped magnetic resonances.Typically,the transparencywindows are ... -
Polarization independent and tunable plasmoninduced transparency for slow light
(Royal Society of Chemistry, 2017)A novel metamaterial composed of a Ag nanoprism periodic tetramer is proposed in this paper. Themetamaterial has high structural symmetry and shows polarization independent plasmon-inducedtransparency (PIT), demonstrated ... -
Prediction of the Likelihood of Households Food Security in the Lake Victoria Region of Kenya
(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 ... -
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 ... -
PREGNANCY OUTCOME IN WOMEN PRESENTING WITH OBSTRUCTED LABOUR IN A RURAL HOSPITAL, KENYA
(2015)Background: Obstructed labour still remains a life – threatening catastrophe all over the world but mostly in the developing countries. This, entirely preventable labour complication carrying a very high maternal and ... -
Pricing Interest Rate Caps and Floors under the Pearson-Sun Interest Rate Model
(2018)Interest rate derivatives are largely used to manage interest rate risk. For this reason, the accuracy of their pricing is very important as mispricing can result in huge financial losses. In this study, the Pearson-Sun model, ...