investment casting is a versatile manufacturing process to produce high quality parts with high dimensional accuracy. the process begins with the manufacture of wax patterns. the dimensional accuracy of the model affects the quality of the finished part. the present study investigated the control and optimization of dimensional deviations in wax patterns. a mold for an h-shaped wax pattern was ...

Purpose: To compare a new slit lamp based technique using Purkinje images for corneal marking prior to toric IOL implantation with conventional techniques of corneal marking Methods: 30 consecutive eyes were marked using the new technique and another 30 consecutive eyes were marked using conventional (bubble) marker. The results were evaluated photographically using a dedicated planimetry softw...

Attempt 3 questions. (If you attempt more, only the best 3 will be counted.) All questions carry the same number of marks. Unless otherwise stated, all groups are compact (or finite), and all representations are of finite degree over C. 1. Define a group representation. What is meant by saying that a representation α is simple? Determine all simple representations of S 3. from first principles....

The radiolucent surface plate of the C-arm image intensifier is often used as an operating table, particularly in surgery on the hand. The advantages include easier positioning and clearer quality of the image. We wish to draw attention to the dangers of this practice. Examination of our image intensifier has shown three penetrating holes and a number of scratch marks on the surface plate which...