A Tree Structure Storage Model of BOM

1　 The Structure Analysis of BOMIn recentyears civil enterprises in increasing numbers begin to recognize the significance ofimplementing MRP .One key step of implementing MRP is building dependable BOM( Bill of Material) .so a reliable and high flexible BOM storage form should be built.Billof Material,BOM,which is the Technique document on illuminating the productstructure,is used to demonstrate the structure and relationship between the final product( never processed in current en…     

岩爆的剪切滑移机理分析

在讨论地下围岩应力分布的基础上,用滑移线场理论和Ｍｏｈｒ－Ｃｏｕｌｏｍｂ准则研究了地下洞室围岩进入塑性破坏状态的特征,推导了岩块沿滑移线滑落的条件,得到了岩爆发生时地应力的计算公式．对天生桥引水隧洞的岩爆实例进行了分析和计算,得到了较满意的结果．     

Development of gamma-glutamylcysteine synthetase and oxoprolinase in rat kidney.

gamma-Glutamylcysteine synthetase is present in barely detectable amounts in foetal kidney. Its activity starts to increase in postnatal life. In contrast, oxoproline is already found in significant quantities in the foetal tissue. Both enzymes show marked elevation in activities during the weaning period.     

Stress propagation: getting to the bottom of a granular medium

Penetration by an object through a dense granular medium (for example, by a finger pushing slowly into the sand on a beach) presents an interesting physics problem that is closely related to issues of practical importance in soil science. Here we measure the penetration-resistance force for an object approaching the solid bottom boundary of a granular sample--analogous to the finger approaching a flat rock buried in the beach. We find that the penetration resistance near the boundary increases exponentially, which demonstrates the existence of an intrinsic length scale to the 'jamming' caused by a locally applied stress.