N p = ∫ Δt Φ p dt MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaaiaad6eadaWgaaWcbaGaaeiCaaqabaGccqGH9aqpdaWdraqaaiabfA6agnaaBaaaleaacaqGWbaabeaaaeaaimaacqWFuoarcaWG0baabeqdcqGHRiI8aOGaaeizaiaadshaaaa@4138@
unit : 1