We present a fast algorithm to calculate the radar cross section (RCS) of electrically large targets using a shooting‐and‐bouncing rays (SBR) method. By applying multiresolution grid ray tubes, we accelerate the ray tracing in the SBR. The numerical results illustrate the accuracy and efficiency of our proposed algorithm. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 394–397, 2001.

The main objective of this research is to develop a mechanical etching technique to produce micro mould dies having micro pockets of hundreds of µm. A powder blasting technique is applied to stainless steel plates based on predefined process conditions. This paper describes the performance of a powder blasting technique and the effect of the number of nozzle scanning times and the stand-off distance of the nozzle on the depth and width of pockets. Required blasting and measurement steps are performed to extract the relationships between given process parameters and machined results. Experimental results show that increasing the number of nozzle scanning times and decreasing the stand-off distance of the nozzle increase the depth and width of machined pockets. Increase of the width of the pockets results from mask film wear. The results of this research can be a fundamental basis to produce more accurate and smaller micro pockets using the powder blasting process.

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