Several methods have been proposed for extrapolating the interruption life of vacuum circuit breaker contacts and these have resulted in many different claims.

This paper uses fuzzy theory to make a comprehensive judgement on vacuum circuit breaker s electrical interruptive life and presents a method of how to deal with off line(or on line) data of each parameter.

The effects of temperature and applied stress on rupture life, and the relations of temperature, applied stress and rupture life to characteristic dimensions of coherent phases (γ matrix channel width and rafted γ precipitate thickness), and to the elongation as well as to the cross sectional area reduction of the tested specimens were investigated.

The P92 steel is a steel sort being used for main steam pipelines of ultra-supercritical units at present,its creep rupture life has widely drawn close attention.

,and combining the features in China,the theory system on life diagnosis is put forward for the important hydraulic engineerings.

The measures that life diagnosis of reheater by the thickness-detecting technology for oxide-scale on inner-side of tube, the increase of tube temperature detecting p.

According to the detecting conditions about the switch life of the fluorescent light and ballast based on our National Standards and the Profession Standards for Railway Ministry, the paper proposes an instrument to detect the switch life of the fluorescent light and ballast as well.