Then, on the basis of the expression for notch strength of brittle material and the fundamental principle of probability theory, correlations between the statistical characteristic parameters o.

In order to examine the usefulness of the fracture surface roughness parameters in quantitative fractography, some geometric characteristic parameters, namely profile height distribution, average roughness, root -mean -sqare roughness, lineal roughness parameter and fractal dimension, are developed for quantitative estimation of fracture surface roughness.

The characteristic parameters for dusty plasmas of rocket exhaust plume and polar mesosphere are estimated and analyzed based on their practical data.

Sensitivity analysis method of the factors impact of blasting vibration characteristic parameters based on non-correspond ratio of rough set theory is put forward.

Through the gear wearing experiment on gearbox,and extracting the characteristic parameters the validity of this method is shown.

Some characteristic parameters, such as dielectrie dissipation incremental rate △2, capacitance incremental rate △C″, dissipation index of partial discharge PDI, secondary AC current rapid increase index m2, skewness of statistical parameters of partial dischar.

In order to express the tanks floor corrosion condition,the characteristic parameters such as the corrosion probability,maximum depth of pits,average depth of pits,maximum pitting rate,average pitting rate,corrosion leakage area are provided.