HORIZONTAL CLOAKING AND VERTICAL REFLECTION BY TRANSFORMATION ACOUSTICS



Drilling technology in mining industry

The fundamental problem in rock working is the breakage of fragments out of the face of a solid rock wall rock.Mechanically, this can be done only by forcing a tool into the rock surface, after the manner of an indenter is commonly used in the testing of ut solution gel for cats surface hardness.Since the process breaks rather than cuts the solid r

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