Performance Enhancement of DIAdrill Operations
Conventional drilling of rock, in most mining applications, uses the mechanical impact of a metal tool to create the advancing hole. This technique, which has gradually increased in power and thus penetration rate has, however, certain inherent disadvantages. These range from the overall weight of the equipment which must be located at the free face of the hole to the maintenance of alignment over long distances, particularly with smaller diameter holes, where the limitations of thrust delivery through the small diameter rod can limit performance.
Steel Shot Entrained Ultra high Pressure Waterjet for Cutting and Drilling in Hard Rocks
In this paper the effects of using steel shot as the abrasive to cut dolomite over the pressure range of 138–275 MPa is presented. Conventional abrasive is fragmented during mixing and impact and cannot be recycled. Steel, in contrast, has the strength to remain intact and the greater density to give more rapid cutting. Steel was selected because it is the heaviest grit which is economically available for use as an abrasive.
Investigating the Optical properties of cd1-xznxs thin films deposited by the Dip Technique
A Thesis submitted to the Department of Physics, Kwame Nkrumah University of Science and Technology, in partial fulfillment of the requirement for the degree of 
Master of Science (Solid State Physics)