In the experiment to measure coefficient of thermal conductivity of poor conductors by steady condition method, it is found that geometrical boundary condition of sample has great effect on the measured data of coefficient of thermal conductivity.

It is pointed that,as a flow of 2D symmetric geometry boundary which has only one entrance section and one exit section,the symmetric flow on the upstream section doesn\'t determine if the downstream section is symmetric or not,even the whole flow field.

Applying the principle of the graph theory put for-ward the method which forms thegeometrical conditions of the contrl network tomatcally and then discussed thestransformation on contr-ol network to form base-line condition.

This paper analyzes the closure error and tolerance of the geometrical condition existing in the plane control network,and based on the production practice,introduces some methods and experiences of making the check calculation of the closure error by using EXCEL.

To meet the needs that obstacles would be mounted in the tube to change the geometrical conditions and that the inner wall of the tube should be made repalceable by some porous materials for changing the physical boundary conditons, a specially designed testing section .

This paper elaborated geometric condition of Pareto curve which should be satisfied,generalized the graphic method for the analyzing drawing ABC, makig it normalized,and applied the Pareto curve to supervise the brick--laying quality of a certain project, finding out the main elelemts influencig the quality of the project.

We proved, under a geometric condition given by Capietto, Mawhin and Zanolin, the infinity and some dense distribution of even or odd symmetric subharmonics for the equation with oscillatory nonlinearity.