Ytterbium triflate hydrate catalyzed Michael addition and cyclocondensation of α,β-unsaturated ketones with active methylene compounds

Catalyzed by ytterbium（III） triflate hydrate [Yb（OTf）3.xH20], the Michael addition and cyclocondensation of α,β-unsaturated ketones with active methylene compounds to afford the 1,4-adducts and benzo[b]pyran derivatives, respectively were studied.     

自旋阀中电流诱导磁化翻转行为的研究

通过实验研究了一种特殊的反对称自旋阀结构．研究发现,随着外加磁场的增大,该结构纳米器件表现出了一种由“逆CIMS”向“正常CIMS”的转变．这种现象是因为：该反对称自旋阀在不同的外加磁场下有不同的磁化取向,因而引起不同的CIMS行为． 关键词： CPP ESPV CIMS