Analysis of magnetic saturation FCL based on systems of naval ships;

Phase difference between the voltage and current of the ultrasonic transducer is tested as the control signal of working frequency, and the electric field is changed around the loop with DCPs according to the magnetic saturation theory to convert its inductance to get working frequency close to the resonance one.

With the theory of far field eddy current put forward and many eddy current testing equipments developed, such as the array eddy current probe, magnetic saturation device and so on, it becomes possible that the eddy current technology is applied to inspecting defects of large, medium thickness str.

In two-step heat treatment,the coervivity is reduced obviously and saturation magnetic moment is improved obviously with prolonging the heat-proof time.

The dependence of cation distribution in lattice and saturation magnetic momenton the content of Co(Ⅱ)have been calculated.

Preliminary results show that the formation of nanocrystallites gives a drastic increase of the thermal expansion coefficient below Curie temperature TC and the saturation magnetic moment at 77 K, while the expansion coefficient above the TC remains almost unchanged as annealing temperature increase.

The variety of temperature with saturation magnetization of YFe 12- x Mo x compounds was analyzed using molecular field theory.

The temperatrue dependence of the saturation magnetization of R 2Fe 17- x M x alloys has been analysed by the two-sublattice molecular field theory.