Perturbation of Lie symmetries and a type of generalized Hojman adiabatic invariants for variable mass systems with unilateral holonomic constraints;

In this paper, the Mei symmetry of variable mass systems with unilateral holonomic constraints is studied.

Form invariance of holonomic systems with unilateral constraints in phase space;

Deals with the form invariance and the conserved quantities of a Lagrange system forced by holonomic constraints.

The motion of the rolling disk was analysed to try to explain some unintegrable equations of constraint which is not definitely independent equation of nonholonomic constraint,and the concept of concealed coordinate was proposed.

The conservation law of mechanical energy in variable mass mechanical systems with ideal bilateral holonomic constraints is studied.

Some rules for dealing with the integrity constraints are presented by analyzing the different types of integrity constraints in schema integration multidatabase systems.

This paper proposes a kind of method that can preserve integrity constraints in data mapping,contrives a mechanism(DAPPIC)of generating constraints-preserving publishing rules.

For this purpose,this paper analyses briefly the semantic constraints characteristics in both XML schema and relation schema,and gives the detailed introduction about the conversion methods from the semantic constraints of XML schema to the integrity constraints of relation schema.