A ring is called nil G-*-clean ring if each of its elements is a sum of a G-projection and a nilpotent.In this paper,we study the basic properties of this ring and some relations with other rings.We prove that R is ni...A ring is called nil G-*-clean ring if each of its elements is a sum of a G-projection and a nilpotent.In this paper,we study the basic properties of this ring and some relations with other rings.We prove that R is nil G-*-clean if(G(R)+J)/J=G(R/J)=and only if is nil,and is nil G-*-clean.展开更多
在海底管道铺设项目中,需要S-lay型铺管系统和J-lay型铺管系统完成铺管任务。分别对两个系统进行合理的空间布置设计,将其集成于同一艘深水起重铺管船。对双铺管系统协同作业进行设计,使两个系统共享管段预制线、共享弃置与回收(Abandon...在海底管道铺设项目中,需要S-lay型铺管系统和J-lay型铺管系统完成铺管任务。分别对两个系统进行合理的空间布置设计,将其集成于同一艘深水起重铺管船。对双铺管系统协同作业进行设计,使两个系统共享管段预制线、共享弃置与回收(Abandonment and Recovery,A&R)绞车系统,实现优势互补、提高铺管作业效率。展开更多
基金Supported by Anhui Provincial Natural Science Foundation(2008085MA06)。
文摘A ring is called nil G-*-clean ring if each of its elements is a sum of a G-projection and a nilpotent.In this paper,we study the basic properties of this ring and some relations with other rings.We prove that R is nil G-*-clean if(G(R)+J)/J=G(R/J)=and only if is nil,and is nil G-*-clean.
文摘在海底管道铺设项目中,需要S-lay型铺管系统和J-lay型铺管系统完成铺管任务。分别对两个系统进行合理的空间布置设计,将其集成于同一艘深水起重铺管船。对双铺管系统协同作业进行设计,使两个系统共享管段预制线、共享弃置与回收(Abandonment and Recovery,A&R)绞车系统,实现优势互补、提高铺管作业效率。
