The soft modes in finite-size cubic BaTiO3 crystal with free boundary were calculated,and they can be used to explain the phenomenon that crystal has the structure of a and c domains in ferroelectric phase transition while temperature reduction.

The characteristic of the R-T phase transition is the soft mode at 106 cm-1 (at .

In this paper,a test method for investigating thermal expansion& temperature properties of flexible mold material for RTM process is established and the thermal expansion coefficient of the flexible mold material is obtained.

In this paper,we study the viscosity-temperature characteristics of the silicone rubber COCA31-11,the basic mechanical properties,the test result of the flexible mold material and the process properties of the mold.

Taking a typical model for example, the mould design and fabrication process for vacuum assisted RTM with a flexible mould are introduced .

According to the structure character of the cabin,the model is designed and carbon fiber reinforced epoxy composite is fabricated with polyurethane flexible mould and silicone rubber flexible mould respectively.

The harmonon soft modes in a perovskite structure system;

Many harmonon soft modes are found and they can be used to explain why that barium titanate crystal has a and c domain structures in ferroelectric phase transition while temperature rde-duces.

The soft modes in a finite perovskite with free boundary were calculated, and they can be used to explain why that barium titanate crystal has a and c domain structures in ferroelectric phase transition while temperature reduces.

Study of the Raman Spectra And Behavior of the Soft Mode in Sb_xBi_(2-x)Ti_4O_(11);