To study the effect of thermal deformation parameters such as punch velocity,forming temperature and forming load on forming process of 5A02 aluminum alloy microgears,a microdie is designed and fabricated and pressing ratio is used as evaluation parameter to indicate compactness.

Experimental study on ductility and bearing capacity of concrete frame columns with central reinforcement under high axial compression ratio;

Through the test of concrete frame columns with central reinforcement and general concrete frame column under high axial compression ratio and cyclic lateral loading,the P-Δ hysteresis curve,stiffness degradation,viscous damping coifficients etc.

Based on the experimental study on six separated columns with high axial compression ratio and under horizontal cyclic loading, this paper analyzes the effects of axial compression ratio and stirrup reinforcement ratio on the seismic behavior of the separated columns, including rigidity, cracking, maximum bearing capacity, failure features and hysteresis curve etc.

The test result shows that using EGR is an important approach to solve related difficulty for high compression ratio methanol engine.

Study of microscopic drift instabilities in highβ(plasma pressure/magnetic pressure) plasmas is one of advanced topics in plasma theory studies,for it is of great important in understanding the basic plasma behaviors and researching on advanced magnetic confinement fusion and space physics.