According to the existed weakness of stream tube divided by handwork in the widely applied river 2D water quality model of accumulative flow rate,the principle of stream tube divided by computer is put forward and the detailed divided steps,methods and an applied case of stream tube divided by computer are given in this article.

In view of these issues, this paper suggests that genetic algorithm can be applied for well pattern and well number optimizations in order to get maximum cumulative production and best economic benefits.

Based on the characteristics of the cumulative production, and the research of previous models for production forecast, a new model for the prediction of the production rate, cumulative production rate and recoverable reserves of oil and gas fields is developed.

Based on statistical development data of large oil and gas fields, a simple model for predicting production, cumulative production, and recoverable reserves is developed.

Effect of Feed Composition on Purity Gradient and Accumulation in Two Component Countercurrent Extraction System;

Effect of different fertilization levels on N,P,K accumulations and growth dynamics in flax;

The allocation and dynamic characteristics of trace and beneficial element accumulations in the Trifolium pratense community;

Effect of cadmium pollution in soil on nitrate accumulation of vegetable;

Toxic effects of Cu, Cd on earthworms and Cu, Cd accumulation in their tissues were studied and determined using well-drained soil in laboratory.