Loop shape in fabric are analysed in this paper and the equation about law between remnant curvature and yarn linear density,yarn mechanical properties and knitting elements dimensions is set up.

A method of dispersion calculation was proposed for plastic deformation rate,thus getting the relationships between the plastic deformation rate,residual curvature and average residual stress for different combinations of reduction schedule under conditions of single-valued initial curvature.

With the decreasing of the ratio of long and short axis of cross-section,the crimp curvature gets lower.

SiC/Al composites were fabricated by pressureless infiltration technique, based on infiltration dynamics mechanism and technic method ,the effects of holding time and cooling way on the residual porosity of composites were discussed.

Through analyzing the fracture microstructure, measuring line-shrinkage rate, density and residual porosity of sintered sample, the influence of sintering temperature on density and the influence of the type of dispersant on residual porosity of sintered sample were studied.

Based on the performance test data of two sub-critical steam turbine units before and after overhauls in certain power plant in 16 years, the practical method to determine the degradation factors was discussed, the extent of degradation was calculated and analyzed, and two new concepts, namely, the ratio between degradation factors and the rate of residual degradation, were proposed.