The infection of temperature and humidity on steel corrosion rate and comprehensive effect were studied by manpower-climate-environment lab,and influencing mechanism was analyzed.

Rebar corrosion rate is an important parameter in studying the concrete structure durability.

The paper,from a view of the optimized design,has made a plain analysis on the ratio nality of rust and corrosion resistance for steel sluice gate surface and computerized the weight pro protion of the surface among that of the whole arched steel sluice gate.

In this paper the onedimonsional Stefantype model for the heat effect of highirradiance laser on biotissues and the inverse problem identification are adopted to obtain a relational expression for calculating the ablation depth in laserirradiated tissues, in which the complex nature of actual situationthe multidimensional problemis taken into account.

The damage morphology, and threshold fluence as a function of pulse duration and the dependence of ablation depths on the pulse fluences are measured.

The relation between damage threshold,ablation depth and laser pulse duration,wavelength,energy fluence is studied with the model.

In combination with corrosion analysis, especially with the pit corrosion analysis, a model for calculating collecting line pit corrosion depth and a model for statistically predicting the leak off in the collecting line caused by pit corrosion are established on the basis of corrosion investigation.