摘要：To accelerate the development and design of magnesium(Mg)alloys,the structural and mechanical properties of important precipitates in Mg−Zn alloys were studied by experiments and density functional *** nano-indentation tests revealed that the hardness of the precipitates initially increased and then decreased with increasing Zn content,and was significantly higher than that of pure Mg and *** calculation results revealed that the precipitates stability initially increased and then decreased with increasing Zn *** bulk moduli of the precipitates increased,whereas their shear and Young’s moduli initially increased and then decreased with increasing Zn *** decreasing order of ductility for these compounds is MgZn_(2)>Mg21Zn_(2)5>Mg2Zn11>*** surface profiles of the compounds revealed that they are obvious *** the degree of covalency and bond length of covalent bonds initially increased and then decreased with increasing Zn content.

摘要：Objective Improving the traditional Tennsion method to explore more reasonable re pair method for unilateral cleft ***37cases were operated to reconstruct the ala nasi and upper lip philtrum r idge form with rotatory alae nasi triangle flap plus improved Tennsion method,and compared the operational results with that of traditional Tennsion *** The improved Tennison method acquir ed a more beautiful nose and upper lip,it rehabilitated the ala nasi and restored t he physiological function of the orb iculars *** Improved Tennsion method wins an essentially satisfactory operational result of unilateral cleft lip.