南非彼得斯堡绿岩带及林波波带南部边缘区的地质特征及其构造关系

南非津巴布韦和兴普瓦尔克拉通之间为林波波活动带。他们几乎是在同一时期里形成的。卡普瓦尔和津巴布韦在构造上是不稳定的火山一深成环境。而林波波带是较稳定的克拉通环境，彼得斯堡绿岩带位于卡普瓦尔克拉通北部边缘。在绿岩剪切带含有较大的金矿化。林波波活动带的南部边缘区含有与卡普瓦尔克拉通绿宕带相似的构造分裂的花岗一绿岩物质。在空回上受北倾的毫特河剪切带控制。南部边缘向南逆冲沿毫特河剪切带覆于卡普瓦尔克拉通北部边缘。其时间信利为2660Ma。

Homogenization of a Class of Nonlinear Variational Inequalities with Applications in Fluid Film Flow

The authors consider the homogenization of a class of nonlinear variational inequalities,which include rapid oscillations with respect to a parameter.The homogenization of the corresponding class of differential equations is also studied.The results are applied to some models for the pressure in a thin fluid film fluid between two surfaces which are in relative motion.This is an important problem in the lubrication theory.In particular,the analysis includes the effects of surface roughness on both faces and the phenomenon of cavitation.Moreover,the fluid can be modeled as Newtonian or non-Newtonian by using a Rabinowitsch fluid model.