July 2007

Levels of essential micronutrients in soils and growing plants around refuse dumpsites in Akure, Nigeria

In the present study, the levels of some essential micronutrients (Fe, Mn, Zn and Cu) were determined in the soils and growing plants at the base and 25 m away from refuse dumpsites located in Akure, Ondo state, Nigeria. The soils and plants obtained were processed and analysed for these metals using the Bulk scientific GVP 210 atomic absorption spectropho-tometer. The results showed that the levels of Fe in soils at...

Author(s): P. O. Oviasogie, A. A. Oshodi and E. Omoruyi 

July 2007

The effect of moisture imbibition on cellulosic bast fibres as industrial raw materials

The moisture imbibition on four Cellulosic bast fibres, Roselle (Hibiscus Sabdariffa), Okra (Hibiscus esculentus), Baobab (Adansonia digitata) and Kenaf (Hibiscus Cannabinus), were investigated. The fibres were chemically purified by retting, scouring, bleaching and mercerizing. Thereafter, moisture sorption method was adopted. The moisture imbibition ranking of the fibres is in the...

Author(s): U.U. Modibbo, B.A. Aliyu, I. I. Nkafamiya and A. J. Manji

July 2007

Study of some physical properties of urea formaldehyde and urea proparaldehyde copolymer composite for emulsion paint formulation

Copolymerization of urea formaldehyde (UF) and urea proparaldehyde (UP) was successfully carried out. Physical properties which include gel time, viscosity, density, melting point, moisture uptake, refractive index and formaldehyde emission level were evaluated. The infrared analysis of the pure amino resins and their copolymer (UF + UP) showed chemical interaction between UF and UP resins. Resin from the copolymer...

Author(s): Osemeahon, S. A. and Barminas, J. T.

July 2007

Adsorption of lead ions from aqueous solution by okra wastes

Okra wastes from food canning processes were used as a potential adsorption of lead removal from various aqueous solutions was performed. Parameters such as pH, temperature of the solution, particle size of okra wastes and the concentrations of adsorbent and adsorbate were studied to optimize the conditions to be utilized on a commercial scale for the decontamination of effluents using a batch adsorption technique....

Author(s): Mohsen A. Hashem

July 2007

On asymptotic behaviour of a second order delay differential equation

In this paper, the relation between the oscillatory behavior of the solutions of second order differential equation and the oscillatory behaviour of the solutions of the corresponding delay differential equation is established. Also a necessary and sufficient condition for every bounded solution of the delay differential equations to have nonooscillatory solutions is given. A.M.S.C.: 34C10, 34C11,...

Author(s): M. S. Zaki