Faculty of Science & Technology (FST): Recent submissions
Now showing items 3381-3400 of 4284
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PERFORMANCE OF DYE SENSITIZED SOLAR CELLS FABRICATED FROM OBLIQUELY DC SPUTTERED TiO2 FILMS
(Department of Physics, University of Nairobi,Department of Engineering Sciences, Solid State Physics, The Angstrom Laboratory, Uppsala University,, 2006)- Nanocrystalline porous titanium oxide films of varying thickness have been deposited in ambient by reactive DC magnetron sputtering at a fixed but high oblique angle of 60o, and then converted to TiO2 by thermal annealing ... -
On The Regular Polygons In The Chinese Checker Plane
(University of NairobiDepartment of Mathematics, 26480, Eskisehir, Turkey, 2000)In this paper, we define Chinese checker regular polygons, and determine which Euclidean regular polygons are also Chinese checker regular, and which are not. Finally, we study the problem of existence or nonexistence of ... -
EFFECT OF NITRATION ON PRESSED TIO2 PHOTOELECTRODES FOR DYE-SENSITIZED SOLAR CELLS
(Department of Physics, University of Nairobi,, 2007)TiO2 films made by the pressing method and then nitrogen-doped by heat-treatment in nitrogen, oxygen and argon gas mixture have been studied and the effects of structural characteristics, optical and electrical properties ... -
Reactively sputtered TiO2 layers on SnO2:F substrates: A Raman and surface photovoltage study
(Department of Physics, School of Physical Sciences, University of Nairobi,, 2008)DC reactively sputtered TiO2 layers on SnO2:F substrates were investigated by Raman and surface photovoltage spectroscopy. The stoichiometry and layer thicknesses were investigated by elastic recoil detection analysis. ... -
Titania Nanotubes Prepared by Synthesis Method for Dye Sensitized Electrochemical Solar Cells
(University of Nairobi, KenyaUppsala University, Department of Physical Chemistry, Uppsala, Sweden, 2008)The area of nanostructured materials for dye sensitized solar cells has gained great interest especially after a breakthrough by Gratzel and coworkers in developing a solar cell from nanostructured oxide of titania ... -
Existence And Uniqueness For Optimal Control Of Oxygen Absorption In Aquatic System
(University of Nairobischool of biological sciences, 2000)In this paper, we consider the mathematical formulation and analysis of an optimal control problem for a nonlinear Dissolve Oxy-gen(DO)/ Biological Oxygen Demand(BOD) system with logistic growth term. In the BOD/DO system ... -
Metallic Cu and In Films deposited by d.c. magnetron sputtering
(Kluwer Academic PublishersDepartment of Physics, University of Dar es Salaam,, 2001)Cu and In fims have been deposited by direct current (d.c.) magnetron sputtering on glass substrates under different deposition conditions. Deposition temperature, partial pressure in the vacuum chamber, and thickness ... -
Fate of applied fertiliser nitrogen in a long-term maize-bean cropping system in Kenya
(School of Biological Sciences, 2002) -
Invasion and Colonisation of Maize plant Rhizosphere by two Plant Growth Promoting Rhizobacteria (PGPR
(School of Biological Sciences, 2002) -
Inoculation responses of Leucaena leucocephala grown in two tropical soils. International J. of BioChemiPhysics. Vol. 13 & 14
(School of Biological Sciences, 2002) -
Electrochemical monitoring of heavy metal ion solutions containing sweet potato plant varieties under in vitro conditions
(School of Biological Sciences, 2009) -
The Climate And Meteorology Of Nairobi Region, Kenya
(University of Nairobi.Department of Meteorology, University of Nairobi,, 1992-05)The City of Nairobi is located at longitude 36 50' E mid 1 18' S. The mean altitude is around 1,700 meters above the mean sea level but as the city has a highly variable topography, this height ranges from l,600m (to the ... -
Phosphorous as the limiting nutrient element for the eutrophication of Nairobi dam , Kenya
(School of Biological Sciences, 2010)Research work on Nairobi Dam, Kenya and its tributaries revealed Poor negative correlation between Phosphorous (Hydrolysable + PO43-) and NO3--Nitrogen, giving a regressionline of y =-0.2176x + 2.1471with R2= 0.1876 on ... -
The Phase Space Distributions and the Correspondence Principle
(Department ofPhysics, University of Nairobi, 2006)An attempt is made to obtain a correspondence between the classical mechanics and the Wigner-type quantum mechanics by analyzing a particular solution to the quasiprobability operator equation. We have applied this ... -
Correlation between dissolved oxygen and total dissolved solids and their role in the eutrophication of Nairobi Dam
(2010)Research on Eutrophication of Nairobi Dam, Kenya and its tributaries has revealed fair negative correlation between Dissolved Oxygen (DO) and Total Dissolved Solids (TDS) Contents (y =-24.562x+622.28, R2= 0.6835). This ... -
Probability estimation in group screening designs with put errors in decisions
(School of Mathematics, University of Nairobi, 2012)Sometimes due to confidentiality purposes, the objective is to estimate the proportion P of individuals that posses a certain characteristic, such as a blood disease or an antibody, without necessarily identifying the ... -
