Astronomers think Swift has a dead-on view of the digestive system of a black hole, which is blasting out a jet of energy as it RIPS apart a star trapped in its gravitational fist.

Based on the principle of cumulative charge explosion, a new kind of rock cutting blasting technique, the jet perforator charge blasting in small diameter boreholes, is developed in this paper.

The drilling rig is mainly used in soil and rock anchoring, consolidation of road base, dam base and retaining wall, and blasting hole drilling and jet-grouting.