The approach of two-stage modeling and its application in the study of heterogeneous reservoir of Upper Member 4 of Shahejie formation in Bonan subsag;

Optimizing on fermentation condition of the mixed culture in two-step fermentation of Vc;

on VC two-step fermentation.

An in vitro experiment system for vitamin C(Vc) two-step fermentation has been developed using the cell-free extract of Gluconobacter oxydans and Bacillus megaterium as the basal reaction solution.

To probe into the effective methods to make the natural bamboo fiber finer with enzymatic treatment,the manufactured natural bamboo fibers were treated with laccase,scouring enzyme,and scouring enzyme +laccase(a two step method) respectively according to the design by means of orthogonal experiment.

The experimental studies on iron carbide formation by two step method have been carried out.

The low melting glass and the long afterglow luminescent material CaTiO_3: Pr~(3+) have been mixed as raw material, and the raw material has been prepared red long afterglow luminescent glass CaTiO_3: Pr~(3+) through two step method.

The two-step heating carbonization process was used to prepare highly activated wood charcoal.

Carboxymethyl-cellulose superabsorbent materials prepared by two-step heating process;