Vector potentials produced by uniform electric current in the shape ring, cylinder and disc are discussed.
采用柱对称性和叠加原理讨论了均匀载流圆环、圆筒、圆盘的矢势问题。
Carried through kinematic analysis for napping the CMP process of ring polishing machine, and presented pace vector and track equation about one point relative to examination piece on polishing pad.
对修正环形抛光机CMP过程进行运动分析，给出研磨盘上一点相对于工件的速度矢量与轨迹方程。
The vector is in ring shape , comprising a procaryon replication origin, two eucaryon replication origins and selective marker genes, and two green fluorescent protein gene expression cassettes;
该载 体是一种环状载体，包含原核复制起点、真核复制起点、筛选标记基因和绿色荧光蛋 白基因表达盒；
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