To solve the coupled vibration of a gravity dam-reservoir systemwith variable water depth by using a hybrid element method, the fluidregion with variable water depth needs to be dis- cetized by FEmeshes. However, such...To solve the coupled vibration of a gravity dam-reservoir systemwith variable water depth by using a hybrid element method, the fluidregion with variable water depth needs to be dis- cetized by FEmeshes. However, such a method asks for a great computational costowing to the ex- cessive unknowns, especially when the fluid regionwith variable water depth is relatively large. To overcome theshortcoming, a refined boundary element method is proposed to analyzethe fluid field, in which only the discretization for the boundary ofthe variable depth region is required. But as a basis of thisapproach, it is necessary to construct a new Green's functioncorresponding to an infinite strip region.展开更多
简要叙述了Nd Fe B合金在平衡、非平衡条件下的凝固规律及其晶体生长特点。高性能烧结Nd Fe B磁体对母合金组织的要求 (不含α Fe ,具有明显的柱状晶 ,柱状晶尺寸均匀 ,宽度在 5～ 2 5μm之间 ,富Nd相有序排列 ,分布均匀 )及Nd Fe B磁...简要叙述了Nd Fe B合金在平衡、非平衡条件下的凝固规律及其晶体生长特点。高性能烧结Nd Fe B磁体对母合金组织的要求 (不含α Fe ,具有明显的柱状晶 ,柱状晶尺寸均匀 ,宽度在 5～ 2 5μm之间 ,富Nd相有序排列 ,分布均匀 )及Nd Fe B磁体在通讯、电子、医疗等行业的大量应用 ,促进了新兴近快冷厚带制备技术的诞生。系统阐述了新兴近快冷厚带制备技术的特点与优势 ;从柱状晶的生长条件出发 ,重点说明了诸如化学成分优化、氧含量、温度场、冷却速度等关键工艺参数的控制原则。展开更多
文摘To solve the coupled vibration of a gravity dam-reservoir systemwith variable water depth by using a hybrid element method, the fluidregion with variable water depth needs to be dis- cetized by FEmeshes. However, such a method asks for a great computational costowing to the ex- cessive unknowns, especially when the fluid regionwith variable water depth is relatively large. To overcome theshortcoming, a refined boundary element method is proposed to analyzethe fluid field, in which only the discretization for the boundary ofthe variable depth region is required. But as a basis of thisapproach, it is necessary to construct a new Green's functioncorresponding to an infinite strip region.
