Streck introduced the first three- and five-part differential controls
, the first reticulocyte control and offers patent-protected five-part differential controls
plus reticulocytes and nucleated red blood cells.
Such situation is formed when the integral control ([K.sub.I]) is practically of the same purpose and size as the entirety of differential controls ([K.sub.1], ..., [K.sub.n]), which are equivalent to it and their efficiency value is the same.
It shows how much the differential control is better if compared to integral.
It can be seen from Table 1, that the differential control in all analyzed cases is more efficient than integral and the less the value of [P.sub.Ui] is, the more efficient it is in respect of the second one.
In result of differential control at the point A (Fig.