It is shown that there is a condensation effect in dust plasma that caused by the gravitational instability, so that the density increases locally.

It is shown that the gravitational instability takes place only when the Jeans frequency is more than the frequency of dust plasma, and the growing rate for the instability depends intensely on the collisional frequency in dust plasma.

In order to study the effect of the gravitational instability in the formation and evolution of giant molecular cloud models (GMCs) in galaxies, the differential rotation models are developed by means of computer simulation methods.

Two models of molecular cloud in disk galaxies are proposed to investigate the formation of giant molecular clouds (GMCs) under the gravitational instability and random collision using PP(Particle Particle) simulation.

The nonlinear dynamic stability of transmission tower is a hot topic in theoretic research, but it is exiguous in china.

Study on instability in electrospinning process;

The paper discusses the theo- ry of city characteristic aesthetic struc- ture by aesthetic psychology theory,and analyses the influence factor of city Characteristic aesthetic structure and its instability.

Facing to the difficulties in manual judging subassembly unstability that usually appears in assembly process planning,unstability discrimination and clamping scheme selection were provided to help engineers to plan the assembly process of subassembly.