A study on the space cell and the triangular divide of the torus during the design of packaging structural and modeling was made.

A study on the space cell and the triangular divide of the tore was madeThe principle for showing tore with space cell and triangular devide were given as well as the data structural of the very 3-D modelThe calculation was simplifiedAnd both the ways for defining the quartuple camber on the tore and together line of comberes with the dispersion method were also presented

Through comparing three calculation modes of titrimetric analysis,a calculation method taking the chemical formula and its stoichiomotric number as the elementary entity is reasonable.

After description of current regionalization methods on natural disaster, this paper puts forward a new method which use the bottom--up region combination based on the basic unit theory.

Based on the theory of basic unit in natural disaster system, the paper took the agricultural natural disaster system of Hunan province as an example, and support of GIS,32 524 basic unit were divided in Hunan province.

According to the different stage of SC, the paper divides the reliability into two kinds: inherency and operation, gives out such a concept as basic unit and two kinds of analyzing method for reliability.