介绍一种新型的辐射式场压电薄膜（RFD）。该薄膜在柔性薄膜（Kapton）上印制螺旋电极并对称粘结在PZT压电陶瓷薄片两侧,加载电压后,螺旋电......

With the help of a radially invariant vector field, we derive inequalities of the Hardy kind, with no boundary terms, fo......