Based on the blasting mechanism of spiral cutting with big empty hole,a mechanic model of blasting in the first blast charges hole is established and the selection of blasting parameters is discussed.

Economic Analysis of Big Shareholders′ Tunneling and Propping Their Listed Companies;

In companies,big shareholders,taking advantage of their controlling status,grab benefits of control,thus resulting in the problem of big shareholders expropriation.

This text has analyzed the current situation and the cause of its formation of the independent director s system of our country, has set up the game models between independent director and big shareholder under complete information and has put forward measures and suggestion for independent director s system.