February 2013

Transient mass transfer flow past an impulsively started infinite vertical plate with ramped plate velocity and ramped temperature

An exact solution to the problem of a transient free convective mass transfer flow of a Newtonian non-Grey optically thin fluid past a suddenly started infinite vertical plate embedded in a porous medium with ramped wall temperature as well as ramped plate velocity in presence of appreciable thermal radiation and first-order chemical reaction is presented. The resulting system of equations governing the flow is solved...

Author(s): N. Ahmed and M. Dutta

February 2013

Effect of geometric parameters on free vibration analysis of thick fiber reinforced plastic (FRP) skew cross-ply laminate with circular cutout

The present investigation deals with the free vibration analysis of a thick four-layered symmetric cross-ply skew laminated composite plate with a circular cutout and clamped boundary conditions. Three dimensional finite element models (FEMs) which use the elasticity theory for the determination of stiffness matrices are modeled in ANSYS software to evaluate first five natural frequencies of the laminate. The variations...

Author(s): V. Bala Krishna Murthy, K. Srividya, M. R. S. Satyanarayana and G. Sambasiva Rao

February 2013

Determination of the crust-mantle electrical conductivity-depth structure of Niger Delta using solar quiet day (Sq) current

Innovative attempt has been made to study the crust-mantle electrical conductivity-depth structure of the Niger Delta region in Nigeria by applying solar quiet (Sq) day current. The study involved the use of geomagnetic data obtained from Lagos by magnetic data set (MAGDAS), Japan in 2010. Gauss spherical harmonic analysis (SHA) technique was employed which separated the internal and external field contributions to Sq...

Author(s): Obiora D. N., Okeke F. N. and Yumoto K.

February 2013

Aftershock sequence analysis of 19 May, 2009 earthquake of Lunayyir lava flow, northwest Saudi Arabia

Aftershock sequence of 19th May, 2009 Lunayyir earthquake (Mw 5.7) has been recorded by deploying seismic stations immediately after the occurrence of the main shock. Analysis of this sequence clarified that; the major part of cumulative seismic moment released during the first hours after the occurrence of the main shock; their orientation is north west (NW) parallel to the Red Sea axial trend along Najd faulting...

Author(s): Al-Zahrani H., Al-Amri A. M., , Abdel-Rahman K.,  and Fnais M.