On the basis of defining the concepts of unascertained parameters of water environment, an unascertained model for calculation of water environmental carrying capacity was established by treating the parameters in traditional model as unascertained numbers.

Calculation of water environmental capacity in lake and reservoir based on unascertained number theory;

Qualitative estimation method of equipment life cycle cost based on unascertained number theory;

In this paper, the correspondence K from the real number set R to the subset R of the unascertained number set R has been given here.

The unascertained mathematics analysis method of the measurable results about the dissolved oxygen of water;

The unascertained mathematics was introduced to analyze the representative values of compressive strength of concrete core from cast in-suit pile at the condition of small sampling data.

Estimation of unknown parameter in It stochastic differential equation;

Comparing them to affirm the correctness,we can get unknown parameter though simulation of MATLAB.

This work develops a design approach to nonlinear adaptive control system with unknown parameters and applies it to excitation control of power systems.

Nonlinear adaptive observer design without a priori knowledge on the unknown parameters;

The problem of robust adaptive tracking for a class of uncertain nonlinear systems with linear unknown parameters and unmodeled dynamics is discussed.

Secondly,a single new adaptive controller is designed and the analytical expression of controller and adaptive law of unknown parameters are given based on Lyapunov stability theory.

Generalized projective synchronization of different orders of chaotic systems with unknown parameters

Form the point of practical application, in this paper, we study chaos synchronization of complex Duffing system, lag synchronization of chaotic system with unknown parameters and generalized synchronization of different order of chaotic systems with unknown paramete.