By the principles of the electric charge conservation, the mass conservation, the energy conservation and the momentum conservation in the nuclear reaction, threshold can be calculated with the methods of primary physics and can be applied to various collision types.

Preciseness of general beam theory in the power calculation of Zhangping Xiyuan Bridge

In order to analyze the adaptability of primary beam theory on cantilever box girde of sandwich composite materials, the stress of cantilever box girde is analyzed by primary beam theory.

The flexibility which takes shear deformation into account of sandwich composite materials of cantilever box girder is analyzed by primary beam theory.

The CAI Courseware Design and Application Effect Evaluation Research in Junior Middle School Physics;

The article has classified scientific research in junior physics,points out the basic steps,common process and points for attention.

With the transformation of Chinese education system from examination-oriented one to all-round development, the teaching method in junior physics class focusing only on knowledge can t keep pace with society.

With the ongoing reform of curriculum in the basic education and the development of the new curriculum of junior physics, it has become an urgent problem that how to stimulate students interest and initiative to study and to improve their abilities of science inquiry thus reflect the notion of Physics Curriculum Standards.