It is found that the strong gradient of physics field has an important effect both on the occurrence and the development of heavy torrential rain, it also provides the evidence to the forecasts of the rainfall area about the formation, the development and the movement of the strong gradient belt of physics field.

This article assumes that the classic theory of lifting force ommits one crucial factor determining lifting force: pressure gradient.

The effect of pressure gradient on the prompt explosion energy of supernova is discussed.

Simplifying the air as an ideal liquid, the Bernoulli s equation in the direction of streamlines and expression of pressure gradient perpendicular to streamlines are derived from Newton s laws of motion, when the gas is flowing, and the lifting force is explained directly.

In this paper,an improved text segmentation algorithm based on gradient reinforcement is proposed for news video.