The necessary conditions for the existence of weak designs are given in the form of two inequalities in this paper. The relations among weak block designs(WBDs)
Some properties of BZMV^dM-algebra are proved, and a new operator is introduced. It is shown that the substructure of BZMV^dM-algebra can produce a quasi-lattic
Applying MTS rock stiffness test machine, tests under triaxial condition were carried out for rockmass under loading and unloading. By measuring and analyzing s