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Browsing School of Pure and Applied Sciences by Issue Date

Browsing School of Pure and Applied Sciences by Issue Date

Now showing items 41-52 of 52

The impact of agronomic inputs on selected physicochemical features and their relationships with heavy metals levels in surface sediment and water in sugarcane farms in Nzoia, Kenya

Omwoma, Solomon; Lalah, Joseph O; Ongeri, David MK; Schramm, Karl-Werner (Springer, 2014)

Sugarcane farming is the most important cash crop cultivation activity in the Lake Victoria basin of Kenya practised in an area covering approximately 114,000 Ha in total. For better yields, various agronomic inputs including ...
Features of the Night-Time F-Region Currents Over Equatorial Africa (August, 2001)

Adero, Awuor Ochieng; Baki, Paul; Kotze, Peter; Mito, Collins (2014)

In this paper, we present the features of the equatorial F-region current systems over equatorial Africa during nighttime on 05thAugust, 2001 observed at midnight. The observations have inferred from in situ CHAMP satellite ...
The impact of nitrogenous and phosphorous nutrients from selected point sources in Kisumu City on River Kisat and Nyalenda Wigwa Stream before their discharge into Winam Gulf, Lake Victoria

Musungu, Patrick Chamula; Lalah, Joseph O; Jondiko, Isaac O; Ongeri, David MK (Springer, 2014)

Various industrial facilities including a fish-processing factory, a matchbox factory, a flour mill and a landfill, all in Kisumu City in Kenya, were studied and found to discharge significant amounts of NO2 −–N, NO3 −–N, ...
Declining commercial fish catches in Lake Victoria's Winam Gulf: The importance of restructuring Kenya's aquaculture programme

Omwoma, Solomon; Owuor, Philip O; Ongeri, David MK; Umani, Moses; Lalah, Joseph O; Schramm, Karl-Werner (2014)

The total weight of commercial fish (metric tons) caught in the Winam Gulf area of Lake Victoria in Kenya declined from 3300 mt to 760 mt between 1995 and 2009. Associated with this decline, and ranked in descending order, ...
Dioxin-like PCBs and PCDD/Fs in surface sediments near the shore of Winam Gulf, Lake Victoria

Omwoma, Solomon; Lalah, Joseph O; Virani, Munir; Schramm, Karl-Werner; Henkelmann, Bernhard (Elsevier, 2015)

Winam Gulf of Lake Victoria is considered to be contaminated with toxic chemicals emanating from anthropogenic activities, especially near large industrial towns such as Kisumu. This has recently caused concerns about its ...
A study on the response of the Equatorial Ionization Anomaly over the East Africa sector during the geomagnetic storm of November 13, 2012

Olwendo, Ouko Joseph; Yosuke, Yamazak; Cilliers, Pierre; Baki, Paul; Ngwira, Chigomezyo M; Mito, Collins (Elsevier, 2015)

Using a set of up to 12 International GNSS Services (IGS) receivers around the East African region, we present the formation of the peak of ionospheric Equatorial Ionization Anomaly during the geomagnetic storm of 13th ...
Developing Global Leaders for Research, Regulation, and Stewardship of Crop Protection Chemistry in the 21st Century

Unsworth, John B; Corsi, Camilla; Van Emon, Jeanette M; Farenhorst, Annemieke; Hamilton, Denis J; Howard, Cody J; Hunter, Robert; Jenkins, Jeffrey J; Kleter, Gijs A; Kookana, Rai S; Lalah, Joseph O; Leggett, Michael; Miglioranza, Karina S. B; Miyagawa, Hisashi; Peranginangin, Natalia; Rubin, Baruch; Saha, Bipul; Shakil, Najam A (2015)

To provide sufficient food and fiber to the increasing global population, the technologies associated with crop protection are growing ever more sophisticated but, at the same time, societal expectations for the safe use ...
Effects of a Branched p-Nonylphenol Isomer (4(3 -,6 -dimethyl-3 -heptyl)-phenol) on Embryogenesis in Lymnae stagnalis L.

Lalah, Joseph O.; Severin, G. F. (2015-05-19)

The tertiary branched alkyl-chain isomers of p-nonylphenol (NP) are perceived to have more estrogenic potency than its constituent secondary and primary straight alkyl-chain isomers. Investigations with single tertiary ...
Seasonal variation in concentrations of organochlorine pesticide residues in tropical estuarine sediments along the Indian Ocean Coast of Kenya

Lalah, Joseph O.; Barasa, M. W.; Wandiga, Shem O. (2015-05-19)
Application of hydrogeochemical modelling in simulating the transportation of elements in fly ash heap under different disposal systems in South Africa

Mbugua, John (2015-07-20)

Ash heap modelling of South African fly ash from Tutuka was carried out and the duration of transportation projected for 20 years based on two disposal scenarios, namely; irrigation of ash with rainwater, and irrigation ...
Reactive-transport modeling of fly ash–water–brines interactions from laboratory-scale column studies

Mbugua, John (2015-07-20)

Dynamic leaching tests are important studies that provide more insights into time-dependent leaching mechanisms of any given solid waste. Hydrogeochemical modeling using PHREEQC was applied for column modeling of two ash ...
SIMULATED MODELING: CONTRASTING Ca/Mg AND Mn+-NATURAL ORGANIC MATTER COMPETITIVE COMPLEXATION IN WATER

Mbugua, John (2015-07-20)

Complexing capacities of calcium and magnesium with natural organic matter (NOM)/selected organic chelating agents, in the presence and absence of other major and trace cations in water,were studied by anodic and cathodic ...

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