Faculty of Science & Technology (FST): Recent submissions
Now showing items 2621-2640 of 4284
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Stochastic modelling of regional annual rainfall anomalies in East Africa
(Department of Meteorology, University of Nairobi, 1986)ARIMA (p, d, q) models were fitted to areal annual rainfall of two homogeneous regions in East Africa with rainfall records extending between the period 1922-80. The areal estimates of the regional rainfall were derived ... -
Use of the shared frailty model to identify the determinants of child mortality in Rwanda
(2011)According to United Nations Development Programme report, achieving the 4th Millennium Development Goal(MDG) means that Rwanda will have to reduce under-five mortality from 196 to 47 deaths per 1000 live births between ... -
A logistic regression model to identify key determinants of poverty using demographic and health survey data
(2010)This study examines the determinants of poverty in Kenya. While most of the studies done on poverty determinants rely on the income, expenditure and consumption data, The data used in this study comes from the Demographic ... -
Isolation and characterization of polymeric and particulate components of acrylonitrile–butadiene–styrene (ABS) plastics by thermal field-flow fractionation
(University of NairobiField-Flow Fractionation Research Center, Department of Chemistry, University of Utah, Salt Lake CityAnalytical Sciences Center, Monsanto Corporate Research, Monsanto Company, 800 North Lindbergh BlvdDepartment of Chemistry, University of Nairobi, 1998)Thermal field-flow fractionation (ThFFF) is shown here to be capable of isolating the polymeric and rubber particulate components of acrylonitrile–butadiene–styrene (ABS) plastic in a simple analytical procedure. To ... -
Recent Trends of Minimum and Maximum Surface Temperatures over Eastern Africa
(Department of Meteorology, University of Nairobi, 2000-08)This study investigated recent trends in the mean surface minimum and maximum air temperatures over eastern Africa by use of both graphical and statistical techniques. Daily records for 71 stations for the period \939-92 were ... -
Quasi-periodic patterns in the East African rainfall records
(Department of Meteorology, University of Nairobi, 1982)In this study East African rainfall records within the period 1922-80 were subjected to spectral analysis in order to examine whether the fluctuations in rainfall during 1922-80 exhibited any periodic or quasi-periodic ... -
Effect Of Insecticide Use On Sunflower (helianthus Annus L.) Pollination And Yield, In Makueni District, Eastern Kenya
(University of NairobiCollege of Biological and Physical Sciences,University of Nairobi, 2003)Sunflower variety 8998 and insecticides; Dimethoate and Karate were used to evaluate the effect of insecticide on pollinators visit and consequently on sunflower yield. Effect of time of spray on seed set was also ... -
Collembola Richness And Diversity Along A Gradient Of Land-use Intensity And Soil Abiotic Factors In Taita, Kenya
(University of NairobiCollege of Biological and Physical Sciences,University of Nairobi, 2009)Soil Collembola communities were sampled along a gradient of land use intensification in Taita-Taveta, Wundanyi division, Coast Province during the wet season (October-November 2007) and dry season (February- March 2008). ... -
The “picnic” model for research training at African Universities: evaluation and preliminary comparison
(University of Nairobi.Department of Meteorology, 1998)What distinguishes the “Picnic” model for research training at African universities from more classical models is reviewed and it is shown how the “Picnic” model deals with remaining drawbacks from the now popular “Sandwich” ... -
Understanding maize/beans intercropping yield distributions from water conservation measures in a hedged agroforestry system in semi-arid Laikipia District, Kenya
(University of Nairobi.Department of Meteorology, 2007) -
Determination of optimal vaccination strategies using an orbital stability threshold from periodically driven systems
(2013)We analyse a periodically driven SIR epidemic model for childhood related diseases, where the contact rate and vaccination rate parameters are considered periodic. The aim is to define optimal vaccination strategies for ... -
On the Linear Mixed Effects Regression (lmer) R Function for Nested Animal Breeding Data
(2009)This work highlights aspects of the R lmer function for a case where the dataset is nested, highly unbalanced, involves mixed effects and repeated measurements. The lmer function is part of the lme4 package of the statistical ... -
Rainfall Variability in Africa
(Department of Meteorology, University of Nairobi, 1979)Time series' of annual rainfall for 69 stations in Africa we~e analyzed for trends an? p~riodicities. Trend analysis showed that most of the annual series indicate some forr~s ~f ?sclllatlons .. rather than any particular ... -
Soil moisture and its consequences under different management in a six year old hedged agroforestry demonstration plot in semi-arid Kenya, for two successive contrasting seasons
(University of Nairobi.Department of Meteorology, 2007-03)Hedged agroforestry (AF) demonstration plots with maize/bean intercrops were studied at Matanya in Laikipia district, Kenya, between 1991 and 1995 inclusive, to understand crop yield behaviour due to selected soil moisture ... -
Effectiveness of entomopathogenic nematodes against sweet potato weevil (Cylas puncticollis) Boheman (Coleoptera: Apionidae) under semi-field conditions in Kenya
(University of NairobiCollege of Biological and Physical Sciences,University of Nairobi, 2009)Sweet potato (Ipomoea batatas (L.) Lam.) ranks second in production and value after cassava among the root crops in Kenya. Its production has been declining mainly due to the damaging effects of Cylas puncticolis Boheman ... -
Cross-Listing and Valuation Effects: Evidence From Nairobi Securities Exchange
(Mount Kenya University, Thika, KenyaUniversity of Nairobi, Nairobi, KenyaWilliam Paterson University, New Jersey, USA, 2012)The purpose of this study is to analyze the valuation effects of cross-listing. The study has conducted a univariate analysis of the Tobin’s Q and the market-to-book ratio for the period before and after the cross-listing ... -
Collembola Density And Diversity Along A Gradient Of Land- Use Types In Embu District, Eastern Kenya
(University of NairobiCollege of Biological and Physical Sciences,University of Nairobi, 2009)Populations of soil-dwelling Collembola were monitored on a land use gradient ranging from Natural forests to intensively cultivated land during the wet season October-November, 2007 and dry season February-March, 2008. ... -
Diversity of sunflower pollinators and their effect on seed yield in Makueni District, Eastern Kenya
(University of NairobiDepartment of Plant Science and Crop Protection. University of NairobiSchool of Biological Sciences. University of NairobiCentre for Development Research (ZEF). University of Bonn. Postfasch, 2008)A field experiment was carried out in 2004 and 2005 to identify the diversity of sunflower (Helianthus annuus L.) pollinators and their influence on seed yield in Makueni district, a semi-arid area in Eastern Kenya. Insect ... -
Real Exchange Rate Volatility in Kenya
(Department of Accounting and Finance, Catholic of Eastern AfricaSchool of Mathematic, University of Nairobi; Kenya, 2012)This paper examines Real Exchange Rate (RER) volatility in Kenya by using Generalized Autoregressive Condition of Heteroscedasticity (GARCH) and computation of the unconditional standard deviation of the changes for the ...
