Based on the study of an indicator index system that depicts the epidemic situation of Severe Acute Respiratory Syndrome (SARS), this paper proposes an approach to divide the epidemic process of SARS into four typical stages, and studies the character of every stage of the indicator index.

Spatial characteristics of PAHs molecular marker indices in surface soil of Tianjin;

In underground deposit,based on original geological data,by using of the changing of terrane to make sure the continuity of geological body,then using a few signal data for describing the characters of fault can estimate whether faults exist or not and the distributing area.