To investigate into the effect of the change in both acoustic impedance of ore like medium and the structure of cylindric charges on fine productivity,a test on fragmentation by blasting was conducted in concrete models.

Distribution of explosive energy consumed by column charge in rock;

In the light of the blasting characteristics of column charge in rock,the mechanism of producing remainder length of hole is analysed and quaisburden of column charge is put forward.

The columnar structure of ZnO thin films with respect to the deposition angle prepared by single source chemical vapor deposition (SSCVD) on Si(100) substrate was examined.

A theoretical analysis was made on the transmitted pressure on the bore wall in explosions of different charge structures such as borehole coupling charge,air-decoupling charge and water-decoupling charge.

Because of its particularities of p ossessing numerous blast holes, strictly required blasting parameters, strictly required perimeter holes' charge and charge structure, the construction quality must be optimized through adopting scientific hole positioning and drilling meth ods and optimizing the blasting parameters.

The influencing factors of diamond s yield rate,such as,catalyzer,charge structure and initiation manners,were experimentally researched respectively.