Objective: This project adopts the dyeing method to compare the degree of the microleakage of premolar typeⅤhole filled by Ceramage polymerization porcelain inlay, Filtek z250 composite resin, Filtek z250 composite resin and Lonosit , Ceramage polymerization porcelain inlays and Lonosit, composite the filling materials effect and provide experimental data for clinical application.

Here in China in the field of engineering exploration we do not have feasible m ethods for drilling and sampling in lining tunnel.

Study on the structural mechanical model for tunnel lining;

The thermal stresses of NY9 and NY10 sections of tunnel lining of the permanent navigation lock of the Three Gorges Project are calculated by using the fixed slab theory, and the results calculated are compared with the results observed.

By using Fourier-Bessel series expansion method, dynamic stress concentration of a cylindrical lined cavity in an elastic half-space subjected to incident plane P and SV waves is studied, and the series solution is presented.