August 2009

Applications of soft computing techniques in materials engineering: A review

  Within the last two decades, a substantial amount of research efforts has been directed at the application of Soft Computing (SC) techniques in engineering. This paper provides a systematic review of the literature emanating from these efforts with particular focus on materials engineering. The primary aim is to provide background information, motivation for applications and an exposition to the methodologies...

Author(s):   Odetunji A.  Odejobi and Lasisi E. Umoru

August 2009

On sandwich theorems of analytic functions involving Noor integral operator

  In this paper, we introduce sufficient conditions for subordination and superordination for subclass of analytic functions containing Noor integral operator. On the other hand, we prove the subordination and superordination results by some theorem studies and proofs. There are also obtained a sandwich results by different ways.   Key words: Noor integral...

Author(s):   R. W. Ibrahim and M. Darus

August 2009

M|G|∞ queue system parameters for a particular collection of service time distributions

  The problems that arise in the computation of the moments of a particular collection of service time distributions, for which the M|G|∞ busy period and busy cycle become very easy to study, are presented in this paper. It is shown how to overcome them. The busy cycle renewal function, the “peak” and the “modified peak” for the M|G|∞ busy period and busy cycle in the case of...

Author(s):   Ferreira, Manuel Alberto M. and Andrade, M.

August 2009

Slip formulation for numerical simulations of jumping paratroopers

  The aim is to develop computational techniques for studying aerodynamic interactions between multiple objects when an object exits and separates from an aircraft. The object could be a paratrooper jumping out of a transport aircraft or a package of emergency aid dropped from a cargo plane. In all these cases, the computational challenge is to predict the dynamic behavior and path of the object, so that the...

Author(s):   Victor Udoewa

August 2009

Modeling laminar flow between a fixed impermeable disk and a porous rotating disk

  We formulate a mathematical model that governs operations of many engineering systems particularly the ceiling fan to explain the fluid flow between the fixed impermeable and the porous rotating disks. The model is based on the continuity and the Navier-Stokes equations which are reduced into a set of coupled ordinary differential equations through transformation by similarity variables. The coupled ordinary...

Author(s):   D. P. Kavenuke, E. Massawe and O. D. Makinde