Some common-used chemical characteristic parameters of formation water,including metamorphic coefficient,desulfurization coefficient,carbonate equilibrium coefficient,Ca/Mg ratio,and Na/Ca ratio are the key parameters for judging gas reservoir preservation.

This paper presents a new approach to mechanical process planning based on parameterized features of parts and technologic knowledge,and makes some discussion on how to apply this method to commercial CAPP system.

Web-based Collaborative Design with Parametric Feature Modeling and Modifying;

Based on depicting architecture of customer individual product tailoring order (CIPTO), this paper analyzes the function of CAD subsystem and points out that it is the key of CAD subsystem realizing automatically design to establish product parametric feature model and to drive automatically product parameters.

Then ,the paper defines the receiver sensitivity and the generator transmitting moltage or current response as its corresponding characterized parameters.

What the physical and chemical characteristic parameters of organic matters affect is the repulsion force between the organic matters and the membranes,while what the molecule weight of the organic matter affects is the siz.