Browsing College of Biological and Physical Sciences (CBPS) by Title
Now showing items 8-27 of 29
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Determination of heavy metals and nutrients in rivers Naka and Irigu, Chuka using aas uv/visible spectrophotometry
(University of Nairobi, 2014)Levels of concentration of heavy metals (lead, cadmium, arsenic and mercury) and nutrients in rivers Naka and Irigu were determined in the first three months (January, February and March , 2013 ) and variation downstream ... -
Does the Assumption of Exponential Arrival Distributions in Wireless Sensor Networks Hold?
(University of Nairobi, 2018)Wireless Sensor Networks have seen a tremendous growth in various application areas despite prominent performance and availability challenges. One of the common configurations to prolong the lifetime and deal with the ... -
Effects of Substrate Radial-Position Relative to the Sputter-Gun Axis on the Electrical, Optical and Structural Properties of ZnO Thin Films Deposited by Reactive Direct Current Magnetron Sputtering
(University of Nairobi, 2018)ZnO thin films were deposited using reactive direct current (dc) magnetron sputtering on glass substrates placed at seven variable radial positions (-1, 0, 1, 2, 3, 4 and 5 cm) relative to the sputter-gun (target) axis. ... -
Highly structured TiO2/In(OH)xSy/PbS/PEDOT:PSS to be used in photovoltaic applications
(University of Nairobi, 2006)A new highly structured system based on TiO2/In(OH)xSy/PbS/PEDOT:PSS/Au has been developed for photovoltaic applications. In this device, TiO2, In(OH)xSy, PbS and PEDOT:PSS serve as electron conductor, buffer layer, absorber ... -
Identification and Sorting of Materials With Portable Libs Before Decommissioning
(University of Nairobi, 2016)Laser Induced Breakdown Spectroscopy (LIBS) is a technique of elemental analysis. A laser beam is focused on the surface of the sample to be analyzed. A small quantity of matter is ablated and a plasma formed by the ... -
Influence of the pH of anthocyanins on the efficiency of dye sensitized solar cells
(University of Nairobi, 2022)The influence of the pH of anthocyanins on photovoltaic performance in dye-sensitized solar cells has been investigated. Anthocyanins were extracted from crushed leaf stocks of Manihot esculenta Crantz (Cassava plant) using ... -
International Journal of BioChemiPhysics
(College of Biological and Physical Sciences, 1991) -
J. Petrology
(2013) -
Mathematical Competitions in Africa: Their Prevalence and Relevance to Students and Teachers
(University of Nairobi, 2022)Mathematical competitions feature in most developed countries as a part of the secondary school experience, but to a lesser extent in developing countries. In this paper we investigate how widespread these competitions are ... -
On the performance, availability and energy consumption modelling of clustered IoT systems
(University of Nairobi, 2019)Wireless sensor networks (WSNs) form a large part of the ecosystem of the Internet of Things (IoT), hence they have numerous application domains with varying performance and availability requirements. Limited resources ... -
Optical properties of amorphous Se90-XIn10SbX thin film alloys
(University of Nairobi, 2016)Ternary thin film alloys of Se90-XIn10SbX (x = 1, 4, 10, 15 and 20) were synthesised by flash evaporation of the pre-melt quenched bulk samples under a vacuum of 10−5 Torr. Optical absorption analysis pointed to indirect ... -
Perpendicular magnetic anisotropy in Mn2VIn (001) films: An ab initio study
(University of Nairobi, 2017)First principles study of the magnetic anisotropy of Mn2VIn (001) films show perpendicular magnetic anisotropy (PMA), which increases as a function of the thickness of the film. Density functional theory (DFT) as implemented ... -
Personal Cloud Computing Adoption: Integrating IT Mindfulness with TAM
(University of Nairobi, 2020)While extant literature is replete with studies on cloud computing adoption by organizations, there is a dearth of empirical literature on personal cloud computing adoption. This study aims at understanding how individuals ... -
Photocatalytic degradation of 4-chlorophenol by titanium dioxide: role of annealing temperature and morphology
(Journal of Applied Sciences and Environmental Management, 2020-01)This work investigates the degradation rate of 4-cholorophenol using Titanium dioxide photocatalysts. Chlorophenols and their compounds are a nuisance as they are recalcitrant to degradation in the environment. Three ... -
The Role of ICT Tools in the Access of Climate Information by Rural Communities
(University of Nairobi, 2019)This paper, seeks to explore how rural communities especially women in Kitui county use ICT tools to access localized climate information and how Digital Capital facilitates or impedes the process. Our view is that the ... -
A Simplified Method for Parameter Determination of a Photovoltaic Module using Manufacturer’s data
(University of Nairobi, 2020)Accurate and fast modelling and simulation of Photovoltaic module requires careful determination and identification of the unknown parameters required in fitting the voltage-current and power-voltage curves to replicate ... -
A Simplified Simulation Procedure and Analysis of a Photovoltaic Solar System Using a Single Diode Model
(University of Nairobi, 2020)A single diode model for a photovoltaic solar module is the most ideal and quick way of analyzing the module characteristics before implementing them in a solar plant. Solar modules manufacturers provide information for ... -
Surface Photovoltage Study of Surface Defects on Co-Doped TiO2 Thin Films Deposited by Spray Pyrolysis
(University of Nairobi, 2016)Surface photovoltage (SPV) spectroscopy is a powerful tool for studying electronic defects on semiconductor surfaces, at interfaces, and in bulk for a wide range of materials. Undoped and Cobalt-doped TiO2 (CTO) thin ...