This paper presents a electromagnetic fluid models of spherical thunder, a combination of closed and opening electromagnetic fluids, and deals with their stability, life_span, self_rotation, magnetic moments, electrification, occurrence and lightening mechanism.

We built up an index system for effectiveness evaluation of the aerostat radar simulative training system based on system theory.

This method is used to evaluate the effectiveness of aerostat radar simulative training system, which provides a good attempt for the application in future.

Preparation of ZrO_2 spherical nanometer powders;

Preparation and characterization of uniform spherical nanometer silver powder;

The preparation of ZrO_2 spherical nanometer powders via emulsion processing route;