Faculty of Science & Technology (FST): Recent submissions
Now showing items 3801-3820 of 4283
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Joziknipholones A and B: The first axially chiral dimeric phenylanthraquinones from the roots of Bulbine frutescen
(Department of Chemistry, 2006)From the roots of the African plant Bulbine frutescens (Asphodelaceae), two unprecedented novel dimeric phenylanthraquinones, named joziknipholones A and B, possessing axial and centrochirality, were isolated, together ... -
Multimodel based Superensemble Forecasts for Short and Medium Range NWP over Various Regions of Africa
(2007)This study examines the predictability of weather over several regions in Africa using a multimodel superensemble technique developed at the Florida State University, which is an objective means of combining daily forecasts ... -
Spatial evolutions of the active convective patterns across the equatorial eastern Africa region during Northern Hemisphere spring season using Outgoing Longwave Radiation records
(1998)This study has used low Outgoing Longwave Radiation (OLR) values to study the structure and evolution of the active convection across Equatorial Eastern Africa (EEA) region (5° N to 10° S, 28° E to 42° E) during the northern ... -
Naphthoquinones from the roots of Aloe secundiflora
(Department of Chemistry, 2012)Two new naphthoquinones, 5-hydroxy-3,6-dimethoxy-2-methylnaphthalene-1,4-dione and 5,8-dihydroxy-3-methoxy-2-methylnaphthalene-1,4-dione, were isolated from the roots of Aloe secundiflora together with the known compounds ... -
Intraseasonal oscillations of the East African long rains and their connection with MJO activity over the Indian Ocean
(2005)Our understanding of the East African long rains (March-May) variability remains relatively poor. Interannual variations are quite small compared to intraseasonal vari- ations. An analysis of pentad rainfall and OLR data ... -
A diagnostic study of the Eastern Africa Monsoon circulation during the Northern Hemisphere Spring season
(1999)The eastern Africa monsoons during the Northern Hemisphere spring (NHS) season are described based on composites derived from various rainfall anomaly scenarios.The years 1981/1984 were delineated as some of the recent ... -
Midtropospheric circulation patterns associated with extreme dry and wet episodes over Equatorial Eastern Africa during the Northern Hemisphere Spring
(1999)The anomaly circulation patterns of contrasting wet and dry episodes over the equatorial eastern Africa (EEA) region are studied using the European Centre for Medium-Range Weather Forecasts analyses. The study focuses on ... -
Anthracene sulfonic acid-doped polyanilines: Electrodynamics and Application as amperometric peroxide biosensor
(Department of Chemistry, 2007) -
The characteristics of cold air outbreaks over the Eastern Highlands of Kenya
(2000)Climatological statistics of extreme temperature events over Kenya are established from the analysis of daily and monthly maximum temperatures for a representative station (Nairobi Dagoretti Corner) over the period ... -
Electrochemical Synthesis and Characterization of 1,2-Naphthaquinone-4-Sulfonic acid Doped Polypyrrole
(Department of Chemistry, 2007) -
Transition from the Southern to the Northern Hemisphere summer of zones of active convection over the Congo Basin
(2003)This study used monthly rainfall totals for the period 1961 to 1988 and pentad OLR values for the period 1974 to 1991 to study the structure and transition of active convention across the Congo Basin (10° S–5° N, 15° E–35° E) ... -
The onset and cessation of the "Long Rains"in Eastern Africa and their interannual variability
(2003)Thirty years (1958–1987) of daily rainfall data for Kenya and north eastern Tanzania are analysed with the aim to characterize the interannual variability of the onset and cessation of the East African “long rains” (boreal ... -
Spectroelectrochemical reactivities of novel polyaniline nanotube pesticide biosensors,
(Department of Chemistry, 2007)The preparation and characterisation of electrosynthetic polyaniline nanomaterials doped with phenanthrene sulphonic acid (PSA) is being presented.The polymeric nanomaterials prepared include processable poly(o-methoxy ... -
The Atlantic-Indian Ocean Dipole and its influence on East African seasonal rainfal
(2009)This study has used principal component analysis, composite analysis and correlation analysis to establish the sea surface temperature modes that could represent the combined influence of the Atlantic and Indian Oceans ... -
Electrocatalytic Sensor Applications of Nanostructured Polypyrolles and Polythiophenes
(Keralala, IndiaDepartment of Chemistry, 2007) -
Synthesis, characterization and Application of Sulfonated polyaniline in Construction of a biosensor for Diazinon
(Department of Chemistry, 2011) -
Flow routing in river Yala using the Muskingum technique (revised)
(2007)Changes in hydrological regimes affect the socio-economic set up in a river basin. Understanding the availability and temporal characteristics of water in river systems can help in monitoring changes in a hydrologic regime. ... -
Synthesis and characterization of silver nanoparticles using tea extracts and their application in nanobiosensors
(Department of Chemistry, 2012)A facile reduction approach with silver nitrate, AgN03, solution and tea extracts led to polydisperse silver nanoparticles, tea-AgNPs, at room temperature. A mixture of AgN03 solution and tea extracts, extracted at 90°C, ...