Faculty of Science & Technology (FST): Recent submissions
Now showing items 3941-3960 of 4090
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Spectroscopic Analysis of Tungsten Mining-Associated Heavy Metals and Radionuclides and Evaluation ofImpact on Agricultural Soil in Selected Areas of Rwanda
(University of NairobiSchool of Physical Sciences, 2012)The aim of this studywas to evaluate the impact of tungsten mining on degradation of agricultural soil quality in selected regions of Rwanda. The determination of heavy metals (As, Pb, Mn, Cu,Zn, Co, Cd, Ni, Cr and Hg) ... -
On some application of algebra and geometry in coding theory
(School of mathematics, 2011-08)The fundamental problem that led to the development of the theory of error correcting codes was that of having a reliable communication over unreliable channels. A commu- nication channel can be as simple as the air ... -
On irreducible representations of Sn
(School of mathematics,University of Nairobi, 2009-06)As mentioned in [8], A group representation can be thought of as an action oi a group G on some vector space. Such actions arise naturally in many branches oi mathematics and physics and as such it is important to study ... -
Modelling the term structure of interest rates in Kenya
(School of mathematics, 2012)Understanding the term structure of interest rates is a key area in the current global environment especially in pricing of financial instruments, debt management and monetary policy decisions. Several studies have been ... -
Gruop testing using the modified binomial model and optimal hierachical procedures
(School of mathematics, 2010-07)In chapter I of this project, we discuss the concept of group testing. We also give a brief history of the group testing procedures and the objective of this project. In chapter II, we discuss the Optimal Dorfman Group ... -
Detecting changes in mean of Malaria Time Series Using change point analysis
(School of mathematics, 2012)Abstract Background A sequence of observation usually undergoes sudden changes at unknown times. Hence, there is need to find out if a shift has occurred in time series data by identifying set of change points. Change ... -
Mobility of photo-injected carriers in dye-sensitized solar cell
(University of NairobiSchool of Physical Sciences, 2008)This work focuses on the mobility of electrons once it's injected into the conduction band of Ti02 in an open circuit conditions. The three possible back reaction pathways namely via substrates, surface states and conduction ... -
Radiative characterization of atmospheric aerosols over selected urban, rural and maritime sites of Kenya using sun spectrophotometry
(University of NairobiSchool of Physical Sciences, 2010)Atmospheric aerosols modulate the radiative budget and ambient air quality of the atmosphere, thus, there is a need to develop both analytical and computational methodological techniques that determine their physical, ... -
Radioactivity and elemental analysis of carbonatite rocks from parts of Gwasi area, South Western Kenya
(University of NairobiSchool of Physical Sciences, 2009)Rocks and soils from a number of areas under lied by carbonatite rocks in Kenya have been associated with high radioactivity. In this thesis, the analyzed results of the background radiation measurements in the field, ... -
Transport phenomenon of photo injected electrons in dye sensitized solar cells.
(University of NairobiSchool of Physical Sciences, 2008)Transport phenomenon of photo injected electrons in Dye Sensitized Solar Cells (DSSC) has been studied and reported whereby the movement of charge carriers has been assumed to be predominantly by diffusion. A theoretical ... -
Radiological survey and elemental analysis in the gold mining belt, Southern Nyanza, Kenya.
(University of NairobiSchool of Physical Sciences, 2009)A radiological survey and elemental analysis in the gold mining belt was carried out at Osiri, Mikei, Masara and Macalder goldmines in Macalder Division of Migori district, in southern Nyanza, Kenya, where gold has ... -
Nighttime identification of region currents from Champ satellite observations over Equatorial Africa
(University of NairobiSchool of Physical Sciences, 2011)This dissertation investigates the ionospheric F-region currents inferred from the interpretation of the magnetic signatures using Challenging Minisatellite Payload (CHAMP) satellite data. The observations are limited ... -
Assessment of Heavy Metal Fluxes and Radiation Exposure due to NORM in the Extraction and Processing of Coltan Ores in Selected Areas of Rwanda
(University of NairobiSchool of Physical Sciences, 2010)The present study quantifies heavy metal fluxes and radiation exposure due to Naturally Occurring Radioactive Materials (NORM) in the extraction and processing of the ColumbiteTantalite (Coltan) mineral in Muhanga, Ruli ... -
In vivo antimalarial activity, toxicity and phytochemical screening of aqueous and organic extracts of selected antimalarial plants in Msambweni district, Kenya.
(University of NairobiSchool of Biological Sciences, 2012)Malaria continues to kill over a million people each year, with more than 90% of these casesfound in sub-Saharan Africa. In many populations affected by malaria, conventional drugs areoften unaffordable or inaccessible, ... -
Impact of climate variability and change on sorghum production in the lower shire valley in Malawi
(University of NairobiSchool of Physical Sciences, 2012)Climate change is likely going to cause changes in the weather patterns over Malawi, which may include the extreme episodes of rainfall and temperatures. Such drastic weather changes will have serious impacts on food ... -
Application of enzyme technology to improve the nutritive value of high-fibre feedstuffs for non-ruminants
(University of NairobiCentre for Biotechnology and Bioinformatics, 2011)An experiment was conducted to determine the effect of supplementing a high fibre diet with combinations of NSP-degrading enzymes on growth performance and nutrient utilization of broiler chickens. The ingredients of the ... -
Prediction of wood density and carbon-nitrogen content in tropical agroforestry tree species in Western Kenya using infrared spectroscopy
(University of NairobiChemistry, 2012)The global debate on climate change needs to be furnished with accurate and precise measurement of biomass in agricultural landscapes. Wood density is a supporting parameter for biomass estimation; however, empirical ... -
Modified electrodes in the study of selected pharmaceutical drugs
(University of NairobiChemistry, 2010)This research was focused <;mthe analysis of selected human drugs and herbal medicines using using surface modified /derivatized electrodes, where the working electrode surface was modified using the chemical substrate ... -
Kinetics and equilibrium studies of single and multi-component metal ion sorption on a micaceous mineral of kenyan origin.
(University of NairobiChemistry, 2011)Water pollution by Chemicals is of great public concern. Improvements in the quality and availability of water are often possible at relatively low costs. The objective of this work was to test the efficacy and applicability ... -
A study of Nairobi wastewater treatment efficiency and effluent quality for safe discharge and possible beneficial uses
(University of NairobiChemistry, 2006)Evaluation of treatment efficiency of Nairobi wastewater at Dandora Estate and Sewerage Treatment Works (DESTW) and possible applications of the effluent was undertaken. A study of selected organochlorines and organophosphates ...