Deduced the propagation rule of longitudinal and transverse wave.On the basis.of this,propagation rules in attenuated visco-eiastic media and Varied Lame coefficientwere put forward as well.The subseq
<正> High performance metakaolinite based cementitious materials were prepared with metakaolinite as main component, and the different modules of Na and Na-K si
<正> The field trail used a mixture of steam and air with various levels of oxygen en- richment.Steady conditions were achieved in the field trail which produce