A simple solution route is used to synthesize ultrafine Cu(OH)2 nanowires by restraining the morphology transformation of early formed 1D nanostructure. The obtained ultrafine nanowires can be well preserved at a low temperature structure transformation in solid state. As anode material for lithium-ion batteries, the ultrafine CuO nanowires exhibit high reversible capacity, superior cycling performance and improved rate capability. The improved electrochemical properties of CuO nanowires are ascribed to their ultrafine size which lead to the reduced over-potential, extra reversible reactions at low potentials and improved interface performance between the electrode and electrolyte. 相似文献
An in-service steam strainer was found to have failed in a steam turbine valve due to the impact of a foreign body. Thus, a Finite element (FE) model was built to study the impact effect of a foreign body on a steam strainer. A Johnson–Cook strength model and its failure model were used to describe the impact-induced failure of the film and deformation of the support in the strainer. The effects of the impact location, shape, mass and speed of the foreign body on the failure of the strainer were investigated. The possible locations of micro- cracks in the film were determined. The FE results indicated that impact by an exfoliated metal part (with small mass, sharp edges and high speed hitting the film close to the rib) is likely to cause failure of the film and large deformation of the support.