January 2013

Application of Cyanex® extractant in Cobalt/Nickel separation process by solvent extraction

This study presents a detailed review on the advanced hydrometallurgical treatment involving the extraction and separation of Cobalt (Co) and Nickel (Ni) by Cyanex® extractants. The structures, properties and applications of various Cyanex® extractants such as Cyanex®272, Cyanex®301, Cyanex®921, Cyanex®923 and Cyanex®421X were discussed and compared. Cyanex®272 thus proved to be the most...

Author(s): Olushola S. Ayanda, Folahan A. Adekola, Alafara A. Baba, Bhekumusa J. Ximbaand Olalekan S. Fatoki

January 2013

Simultaneous ultraviolet-visible (UV–VIS) spectrophotometric quantitative determination of Pb, Hg, Cd, As and Ni ions in aqueous solutions using cyanidin as a chromogenic reagent

The use of cyanidin (3, 31 41 5, 7 – pentahydroxyflavylium chloride) extracted from a tropical plant Hibiscus sabradiffa L. as a chelating reagent for simultaneous spectrophotometric determinations of ions of Pb, Hg, Cd, As and Ni in mixed aqueous solution is reported. The purified extract of the dried calyces of the Roselle plant was characterized and the results compared with literature...

Author(s): C. O. B. Okoye, A. M. Chukwuneke, N. R. Ekere and J. N. Ihedioha

January 2013

Measurement of Kβ/Kα x-ray intensity ratios and K to L shell total vacancy transfer probabilities for elements in the range 40 ≤ Z ≤ 50

The K shell x-ray intensity ratios Kβ/Kα for 9 elements in the atomic range 40 ≤ Z ≤ 50 have been determined for an excitation energy of 59.537 keV. The K-L total vacancy transfer probabilities (ηKL) for these elements have been determined, also. K x-rays emitted by samples were detected using a high resolution Si(Li) semiconductor detector. The measured...

Author(s): A. TurÅŸucu, P. Önder and D. Demir

January 2013

Fourier transform infrared spectroscopic characterization of clay minerals from rocks of Lalibela churches, Ethiopia

This study demonstrates the Fourier transform infrared (FTIR), Raman spectroscopy andscanning electron microscope - energy dispersive X-ray spectrometer (SEM-EDS) techniques which has been applied to characterize decay products and processes occurring at the surface of rock-hewn churches at the UNESCO’s World Heritage site of Lalibela, Northern Ethiopia. Spectroscopic analyses comparing the observed...

Author(s): Alemayehu Kiros, A. V. Gholap and Giovanni E. Gigante  

January 2013

The modified (G'/G)-expansion method for the (1+1) Hirota-Ramani and (2+1) breaking soliton equation

In this article, we apply the modified (G'/G)-expansion method to construct hyperbolic, trigonometric and rational function solutions of nonlinear evolution equations. This method can be thought of as the generalization of the (G'/G)-expansion method given recently by Wang et al. (2008). To illustrate the validity and advantages of this method, the (1+1)-dimensional Hirota-Ramani equation and the...

Author(s): Elsayed M. E. Zayed and A. H. Arnous

January 2013

Experimental study of the elastic multiple scattering by a two-dimensional (2D) periodic array in the case of empty cavities

In this work, we study the propagation of the plane waves in a solid medium (Aluminium) which contains a periodic two-dimensional (2D) array of cylindrical inclusions using a multiple scattering theory. The aim of this study is to validate the experience of certain theoretical predictions such as the frequential positions of the stop-bands and their widths like their evolution according to the geometrical...

Author(s): Ahmed Moumena and Abderezzak Guessoum