This thesis derivates the static character of servo-valve used for hydraulic system of hydraulic oscillation unit for Jiangyin large-size round billet caster and linear function,flow equation for hydraulic actuator,and transfer function,natural frequency,and hydraulic damping ratio for the system and verifies by substituting actual number,which fulfill fully normal production conditions.

Study on effects of fly ash on sludge specific resistance;

Research progress of specific resistance during microfiltration process;

Prediction of specific resistance for yeast suspensions in dead-end microfiltration;

A new Calculating cquation of filter cakes special resistance is advanced,It indicates that the permeability of filter cake is not only related with slurry concentration and its settling velocity,but also related wity the pretreatment and chemical environment of slurry.

The chemical conditioning of water treatment plant sludge using polymer flocculants,surfactants,lime,acids and bases was investigated by measuring the sludge's Zeta potential,sedimentation properties and specific resistance to filtration(SRF).