The ringing problem in digital control for this kind of process was discussed,then a concrete form of the desired closed-loop transfer function was proposed,based on which the structure of the digital controller was obtained.

Signal integrity in the circuits design is discussed in this paper,and the major influencing factors are analyzed such as ringing,border distortion,reflection,bounce,crosstalk and jitter.

At the same time it can also eliminate the ringing phenomena of the controllers.

Aimed at detection of explosive,based on the theory of NQR detection,it is introduced that how the ring of the antenna(is produced in the NQR detection system and how important is to suppress the ring.

To study the genotypic differences of physiological characteristics in leaves subtending bolls and its relationship with the boll weight forming,field experiments were conducted in Nanjing,Jiangsu Province(cotton belts in lower basin of the Yangtze River) in 2004—2005 by using four cotton genotypes.

Different part boll weight were studied in the application of the nitrogen fertilizer and DPC in cotton and the results showed that the upper part boll weight raised significantly compared to the control(CK) in the high yield.

The practical usage of weighted mean in cotton had been expounded through calculated method of circular cone position in cotton bolls and mean of boll weight,and the practical usage of geometric mean,the growth per cent of plant height a day had been expounded through analysing exponential increasing phase of plant height in cotton.