Based on the analysis of soil mechanics for a semi-track air-cushion vehicle(STACV),theoretical models for traction efficiency and total power consumption were established,and relationships between slip ratio and traction efficiency,total power consumption were examined respectively.

Based on analyses of the resistances and driving force for a semi-track air-cushion vehicle (STACV), a theoretical model for total power consumption was established, and the relationships between fan rotational speed and total power consumption, fan rotational speed and slip ratio were examined respectively in three typical soil conditions.

According to the feature that radiation from light source can be distributed equally on the spherical wave lattice (surface) which takes the light source s point as the centre, transforms the rate of the total powers under calculation into the rate of the two spherical coronas areas, which are cut by the light s mouth of the spherical surface and which tak.

This article caught the definition of the total power of RF signal,and then the description of the total energy of analog and digital mixed transmission was made.

According to the feature that radiation from light source can be distributed equally on the spherical wave lattice surface which takes the light source’s point as the centre,transforms the rate of the total powers under calculation into the rate of the two spherical coronas’ areas,which are cut by the light s mouth of the spherical surface and which take th.