The PFM technology includes two kinds modes : constant width PFM and SWFM. 脉冲频率调制又包括了两种方式,即等宽PFM和SWFM。
The authors analyze in detail the operation principle of the high frequency inverter using zero current switching, constant width and variable frequency control. A simple reliable topology is proposed and verified by experiment. 详细分析采用零电流定宽变频控制方式的高频逆变器工作原理,提出了简单、可靠、开关损耗极低的电路拓扑,并通过实验得以验证。
We introduce for convex domains of constant width a measure of asymmetry and show that the most symmetric domains are circular discs and the most asymmetric domains are Reuleaux triangles. 通过引入刻画平面常宽凸域的不对称性函数,证明了在平面常宽凸域中,圆域是最对称的,而Reuleaux三角形是最不对称的。
A Measure of Asymmetry for Convex Domains of Constant Width(CW) 平面常宽凸域的不对称性度量
Based on the analysis of 3 main stretching modes ( uniaxial, constant width and biaxial ), the progress in the research on the orientation induced crystallization during stretching of poly ( ethylene terephtalate )( PET ) is summarized. 综述了PET在3种拉伸方式(单轴拉伸、平面拉伸和双轴拉伸)下的取向诱导结晶的最新进展。