浅谈全充填注浆法在治理煤层采空区中的施工工艺

结合施工实际情况,根据煤层采空区的特点,介绍了采用全充填注浆法施工工艺对其地基进行地质灾害治理的情况。     

常用的地基处理方法及其适用范围浅议

在工程建设中经常存在着不能直接承载建筑物和构筑物全部荷载的软弱地基和不良地基，如何处理这些地基成了工程建设中的难题。探讨了常用的地基处理方法及其适用范围。     

Steroid-bismetalloporphyrin as enzyme model of cytochrome P-450 monooxygenase

The model compounds of androgenic steroid-bismetallopor-phyrins 3a-3d and androgenic monometalloporphyrins 2a-2d have been synthesized. Catalytic study in two-phase condition on epoxidation of styrene under the catalysis of model catalysts shows (hat the catalytic performances of steriod-bismet-alloporphyrin is superior to steroid- metalloporphyrin and the corresponding simple metalloporphyrin. The excellent catalytic property of steriod-bismetallopotphyrin can be rationalized as the hydrophobic action of steroid framework and the cooperative action of two metalloporphyrins in catalysis.