petrol fumes

Carbon potential in heat treatment furnaces can be accurately controlled by PID parameter adjusting,PF value revising,calibrating for the controlling system of carbon potential,and correct choosing,installing,using,maintaining for oxygen probe,and these measures are favourable very for improving service life of oxygen probe also.

通过对碳势控制系统的PID参数调整、PF值修正、校准,及对氧探头的正确选择、安装、使用、维护保养,不仅可以对热处理炉内碳势进行精确控制,而且对提高氧探头使用寿命十分有利。

The results indicated that the average PF value was only 0.

结果表明:果实发育56d时,平均PF值仅为0·086。

Aiming at the structural model of two new kind of conjugate cam mechanism-type FP and type PF,the problem for determining minimum spanning distance between two centers of rollers in these two kind of conjugate cam mechanism with translating follower has been studied and solved.

针对FP型和PF型两种新的共轭凸轮机构结构形式,研究解决了该两种直动从动杆共轭凸轮机构两滚子中心间最小跨距的确定问题。

With linear functional f on a real normed linear space, we define ordering and cone P_f on E.

利用实赋范线性空间E上非零连续线性泛函f,确定了E上半序关系和锥Pf,证明了锥Pf的几个性质,给出了H ilbert空间中Pf的对偶锥的表现形式及由Pf确定的H ilbert投影距离与T hom pson距离。