February 2009
Modified-accelerated Krawczyk’s algorithm
An algorithm that is twice as fast as the original Krawczyk method for finding zeros of nonlinear systems of equations is obtained via the procedures of Wolfe’s modification of Krawckzyk method using the ideas derived in Uwamusi (2004). The method was implemented using Moore’s interval arithmetic. It is shown that whenever the interval arithmetic evaluation exists the Hausdorff distance R(f,[X]) and...
February 2009
Soil erosion prediction using MMF model on highly dissected hilly terrain of Ekiti environs in southwestern Nigeria
Assessment of soil erosion risk is important to formulate effective soil conservation plans for sustainable development. Information from remote sensing techniques can help decision makers prepare resource map accurately in less time and cost. GIS assists in linking those maps with other information related to geographic location and helps modeling, analyzing and solving complex problems. The objective of this study was...
February 2009
Potentials of 3, 31, 41, 5, 7-pentahydroxyflavylium of Hibiscus rosa-sinensis L. (Malvaceae) flowers as ligand in the quantitative determination of Pb, Cd and Cr
3, 31,41,5,7-Pentahydroxyflavylium chloride (cyanidin chloride) was extracted from the flowers of Hibiscus rosa-sinensis L. and blackberry fruits and the purity confirmed by co-chromatography with authentic marker on thin layer chromatography (TLC) and paper chromatography (PC). UV-Visible spectrophotometric determinations of the sample and its Pb (II), Cr (III) and Cd (II) complexes at various pH were carried...
February 2009
Effect of high power ultrasound on aqueous solution of DNA
The effect of (20 kHz continuous wave) ultrasound (power from 17 to 77 W) on the damage of nitrogen bases, the loss of double-helical structure, strand breaks and fragmentation of Calf spleen DNA were studied in vitro. The relative ultrasound sensitivity of the hydrogen bonded base pairs A-T and G-C were also studied. The techniques used in this investigation were ultraviolet absorption spectroscopy and...
February 2009
Tube extrusion design for some selected inner profiles
In this study, tube extrusion process of non-circular inner sections is optimized to satisfy micro structural criteria at maximum production speed and minimum left out material in the die cavity. The die profile design is for-mulated as a constrained non-linear programming problem, which is solved using genetic algorithms (GA). Three extrusion processes are successfully optimized based on this approach. Computer...
February 2009
Hierarchical cluster analysis of hydrochemical data as a tool for assessing the evolution and dynamics of groundwater across the Ethiopian rift
The hydrochemical evolution and flow pattern of groundwater is analyzed in a complex closed rift basin on the basis of multivariate hierarchical statistical cluster analysis. The analysis was made on the basis of water samples collected from over 120 wells and limited surface waters. The result revealed dissimilar hydrochemical phases in the rift and highlands representing different groundwater flow...
February 2009
Biogas production from blends of field grass (Panicum maximum) with some animal wastes
An investigation was carried out on the production of biogas, a low natural gas, from equal blending of field grass (F-G) with some animal wastes which include cow dung (G-C), poultry dung (G-P), swine dung (G-S) and rabbit dung (G-R). The wastes were fed into prototype metallic biodigesters of 50 L working volume on a batch basis for 30 days. They were operated at ambient temperature range of 26 to 32.8oC and...
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