a bstract   background: there are a few studies about commissioning mothers’ understanding from the surrogacy during 9 months of waiting for delivery in iran and other countries. this study was conducted with an aim to explore and explain the nature of concerns (experiences) of commissioning mothers. materials and methods:  a qualitative design with a conventional content analysis approach was ...

Abstract As an important link in the guarantee, military logistics is becoming a hot topic. The paper briefly describes general situation, summarizes characteristics of and research significance center. It systematically analyzes siting model method center, gives two models According to special needs logistics, establish location center simulation algorithm. On this basis, it carry out experime...