February 2008
Effect of mixture components on the properties of MUF resin
The effect of disodium tetraborate decahydrate (DTD) on the properties of melamine-urea-formaldehyde (MUF) resin was studied. The leachability from the MUF resin into solvents was investigated. The solvents chosen in this research were distilled water, 10% ethanol, and 30% ethanol. The main constituents that contribute to the leaching in water are melamine, additional urea, and DTD concentrations. Based on the...
February 2008
Kinetic, isotherm and thermodynamic studies of the biosorption of zinc (II) from solution by maize wrapper
The removal of Zn2+ from dilute aqueous solution using maize (Zea mays) wrapper as the biosorbent is reported in this paper. Batch experiments were carried out to assess biosorption kinetic and equilibrium behaviour of Zn2+ by varying parameters such as pH, contact time and initial metal ion concentration at 27ºC. The analysis of residual metal ions was determined using atomic absorption...
February 2008
Effect of pH and concentration on the complexation of calcium ions with humic acid extracted from composted oil palm bunches
The reaction (complexation) between calcium ions at certain concentrations (1.000, 0.500, 0.250 and 0.125 M) and pH (2, 4, 6, and 8) and humic acid obtained from composted oil palm (Elaeis guineensis Jacq) bunches were investigated in this study. The results obtained showed that at maximum total calcium concentrated (1.000 M) few or no Ca2+ was complexed to the humic acid at pH 2 and 8 respectively, while...
February 2008
On non-standard finite difference schemes for initial value problems in ordinary differential equations
In this paper, we present the theory of non-standard finite difference schemes which can be used to solve some initial value problems in ordinary differential equations. Methods of construction and mode of implementation of these methods are also discussed. We also examine the stability properties of the constructed schemes. Keywords: Non-standard, stability, non-local approximation, initial value...
February 2008
Optimizing friction behaviour of clutch facings using pin-on-disk test
In this work, a rational approach based on Taguchi technique and Pin-on-disk test is used in order to study the friction coefficient behaviour of clutch facings as function of material formulation. Experiments were designed according to the orthogonal array L8 where the chosen factors are temperature and sliding speed. A complex interaction exists between the surface texture of the produced clutch facings and the used...
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