Especially, they systemically concluded the force source of huge aerolite impact incidents and putted out theory of calamity changed evolution of aerolite impact.

After further researching, it will be finally shown that is alternate development of Datwin\'s gradual changed evolution and present calamity changed evolution of aerolite impact.

The process of analyzing the buckling of elastic structures by catastrophe theoryis studied in this paper.

As a mathematical tool of analyzing nonlinear systems in the case of the dynamic characteristic jumping, catastrophe theory has been used to assess the steady state stability,transient stability,and voltage stability in power systems,including simple power systems[1,2.

This paper firstly made a brief review about Catastrophism Gradualismand Neocatastrophism in Geology and then did some researcles on event stratigraphy s formation, development, therotical essence and its importance in earth sciences.

This paper firstly made a brief review about Catastrophism Gradualismand Neocatastrophism in Geology and then did some researcles on event stratigraphy s formation, development, therotical essence and its importance in earth sciences.

Aiming to meteorite impact affair of Cangshan,the nonlinear program ANSYS/LS-DYNA is used to analyze the influence of variation of the mechanical parameters of rockmasses on the emergence,development and evolvement of the deformation field of meteorite impact by using symmetric penalized-function method.

Aiming to meteorite impact affair of Cangshan,the popular nonlinear program ANSYS/LS-DYNA is used to analyze how the change of impact velocity affect the emergence,development and evolvement of the impact deformation field of meteorite.