July 2011

The effects of transesterification on selected fuel properties of three vegetable oils

  Vegetable oils have fuel properties that are not compatible with the requirements for use as diesel engine fuel, the common method of properties modification is by transesterification which involves stripping glycerines from the triglycerides. To determine the effects of transesterification, 5 properties were selected and their values were measured before and after transesterification. The fatty acid profile...

Author(s):   Emmanuel I. Bello, Taye S. Mogaji and Makanju Agge        

July 2011

A tyre-terrain interaction model for off-road vehicles

  The problem of off-road vehicle tyre - terrain interaction is difficult enough to be accurately solved. The previous work of many researchers pointed the terramechanics engineers into the right direction and a variety of methods to the study of tyre - terrain interaction has been developed over the last decades, they range from the entirely empirical to the highly theoretical. In this paper, a mathematical...

Author(s):   M. A. A. Emam, S. Shaaban, S. El-Demerdash and H. El-Zomor     :

July 2011

New combination SOC-WCIP method for the analyze of a low pass filter

  The combination of the Wave Concept Iterative Process (WCIP) method combined with the Short-Open Calibration SOC technique to micro strip discontinuity is presented. This SOC technique is directly accommodated in the WCIP method. It is used to remove the unwanted parasitic errors brought by the approximation of the impressed voltage sources and the feed lines. The WCIP is formulated in such a way that the...

Author(s):   Hanen Harizi, Noureddine Sboui, Ali Gharsallah, Hichem Trabelsi, Henri Baudrand and Abdelhafedh Gharbi      

July 2011

Comparison between the two-equation turbulence models of Jones and Launder and of Wilcox and Rubesin applied to aerospace problems

  In the present work, the Van Leer flux vector splitting scheme is implemented on a finite-volume context. The two-dimensional Favre-averaged Navier-Stokes equations are solved using an upwind discretization on a structured mesh. The Jones and Launder and the Wilcox and Rubesin two-equation models are used in order to close the problem. The physical problems under studies are the low supersonic flow along a...

Author(s):   Edisson Sávio de Góes Maciel        

July 2011

Fuzzing modelling of a single point lathe cutting tool

  A few modern industrial materials are of serious concern to the home model engineer turning with a light lathe machine. Virtually all turning is done using either carbon steel, high speed steel or tungsten carbide tipped tooling. This is mainly due to the fact that the newer and more exotic materials such as ceramic and diamond require high speed and rigid industrial machinery to operate correctly. The...

Author(s):   R. Marumo, M. T. Letsatsi and O. S. Motsamai