Like other environmental systems, lake and reservoir are also complicated systems with uncertainty.

The specified probabilistic models for structural resistances were put forward in connecting with the differences between both structures in deign and in service, which introduce the uncertainty variables into probabilistic models for the in-service structural resistance to reflect the uncertainty of cognit.

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.

Reliability modeling research of component software architecture based on unascertained set and Bayesian net

Comprehensive evaluation system was set up and unascertained set was applicated for it.

Aiming for the immanent software reliability model application inconsistency at present,this article proposes a kind of software reliability model selection method,which bases on the unascertained set.