College of Biological and Physical Sciences (CBPS)
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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 ... -
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 ... -
Conglomeratin: a New Antibacterial Flavonol Derivative From Macaranga Conglomerata Brenan (Euphorbiaceae)
(University of Nairobi, 2022)A new prenylated kaempferol, conglomeratin (1), alongside 7 known compounds including flavonoids (2 and 3), ellagic acid derivatives (4 and 5), triterpenoids (6 and 7), and a coumarin (8)were isolated from the leaves ... -
Water and the UN sustainable development goals
(University of Nairobi, 2022)Water is essential for life, but we need to balance human needs with those of the environment on which we depend for our wellbeing, our health and much of our wealth. Not all of us are lucky enough to have access to ... -
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 ... -
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. ... -
Compositional and Thickness Effects on the Optical Properties of Zinc– Doped Selenium–Antimony Thin Films
(University of Nairobi, 2018)Chalcogenide system of antimony (Sb)-selenium (Se)-zinc (Zn) system is a promising semiconductor for phase change memory devices due to its thermal stability and low power consumption. The study investigated the effect of ... -
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 ... -
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 ... -
Angle resolved photoemission study of surface states on the Pt(997) vicinal surface
(University of Nairobi, 2010)One-dimensional atomic chains can be synthesized on stepped surfaces and the electronic structure of the high vicinal surface plays an essential role in determining the physical properties of atomic chains grown on top of ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Anilino-functionalized Graphene Oxide Intercalated With Pt Metal Nanoparticles for Application as Supercapacitor Electrode Material
(University of Nairobi, 2016)Nanostructured anilino-functionalized reduced graphene oxide intercalated with Pt metal nanoparticles was successfully synthesized. Graphene oxide nanosheets were synthesized using a modified Hummers method with simultaneous ... -
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 ...
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