RBS换靶装置

本实用新型涉及一种ＲＢＳ换靶装置是在靶架密封转动壳上连有两平行的传动链固定架，在两平行传动链固定架上设有靶链传动滚，在靶链传动滚上放有由传动链块和传动链连接片构成的传动链，在传动链块上连有带靶托的靶托转动块，靶链传动滚上连有摇柄；本实用新型一次可同时安装多块靶子、可作到换靶不破坏真空、不停束流、可大大提高工作效率。

Effect of water on mechanical properties of mineralized tissue composites

In the current study, the effects of polar solvents on tissue volume and mechanical properties are considered. Area shrinkage measurements are conducted for mineralized bone tissue samples soaked in polar solvents. Area shrinkage is used to calculate approximate linear and volume shrinkage. Results are compared with viscoelastic mechanical parameters for bone in the same solvents (as measured previously) and with both shrinkage measurements and mechanical data for nonmineralized tissues, as taken from the existing literature. As expected, the shrinkage of mineralized tissues is minimal when compared with shrinkage of nonmineralized tissues immersed in the same polar solvents. The mechanical changes in bone are also substantially less than in nonmineralized tissues. The largest stiffness values are found in shrunken bone samples (immersed in acetone and ethanol). The mineral phase in bone thus resists tissue shrinkage that would otherwise occur in the pure soft tissue phase. © 2007 Materials Research Society.