In order to find the common laws of the basic theories of the special theory of relativity and general theory of relativity,an unchanging system and a correspondence changing system are defined,and the concepts of correspondent equation,essential equation and similar equation are put forward,three correspondent equations between correspondence systems are summed up.

In general,there are two steps in the estimations of the outputs of the uncertain multivariable system:first,identifying the system;second,estimayting the outputs.

This paper considers the design method of terminal sliding mode control for a class of uncertain multivariable linear systems, then a new exponential terminal sliding hypersurface and control of nonlinear systems is proposed.

Via reading system variables fixed point of axes can be determined in machine coordinates system: Via reading system variables PLC state bit is condition of criterion as NC macro-program goto;Via transferring positioning function FC15 or FC18 control for PLC axis is finished.

Boiling process under different condition were taken pictures depending on the use of microscopy in order to find how system variables such as surface condition, laser parameters effect the rapid transient explosive boiling under low temperature environment.

The studies of the witness from the psychologist s view have had two ways of estimator variables and system variables and much achievement.