November 2013

Crustal and upper mantle electrical conductivity structure in north central Nigeria

Separated spherical harmonic analysis coefficients of the external and internal parts of the observed quiet-day geomagnetic field variations (Sq) for the North Central Nigeria were used to determine the conductivity profile to depths of about 873 km by Schmucker equivalent substitute conductor method. Within the crust, the conductivity increased from 0.027 S/m at a depth of 7.4 km to 0.074 S/m at 15.5 km and 0.098 S/m...

Author(s): Obiora, Daniel N. and Okeke, Francisca N.

November 2013

Radon assessment in ground water sources from Zaria and environs, Nigeria

Groundwater (well and borehole) samples from various locations of Zaria and environs including Sabongari, Tudunwada, Danmagaji, Samaru and Bomo have been investigated for their 222Rn concentrations by liquid scintillation counter. The concentration of 222Rn in open well water was found to vary in the range (0.77-28.37) Bq/L and (2.32-48.80) Bq/L for borehole, with a geometric mean of 12.43 and 11.16Bq/L for borehole and...

Author(s): N. N. Garba, N. Rabi’u, B. B. M. Dewu, U. Sadiq and Y. A. Yamusa

November 2013

Synthesis, growth and characterization of picolinic acid hydrochloride: A novel semiorganic nonlinear optical single crystal

Nonlinear optical single crystals of picolinic acid hydrochloride (PHCL) were grown by the slow evaporation method. The grown crystal was subjected to a single crystal X-ray diffraction analysis, to confirm that it belongs to the orthorhombic structure. The Nonlinear Optical (NLO) property of the crystal is confirmed with the emission of green radiation from the crystal under the illumination of laser radiation (106.4...

Author(s): P. Koteeswari, Suresh Sagadevan and P. Mani