Based on liquid pressure forming technology,combining the features of drawing with the hydraumatic technology,through modifying the die properly and selecting the special hydraulic oil as the stress medium between tube blank and die,the oil pressure cavity will be formed between die and work piece by the infiltrated high pressure oil,which makes die and work piece non-contact.

The relation of the stress computation between the conductor system and the dielectric medium system with virtual displacement method in electrostatic field is presented in this paper,the dielectric medium stress essence in the electrostatic field is explained.

The paper gives the reason that in the electrostatic field the dielectric medium stress computation may directly apply the conductor stress formula.

Herein the progress of photochemical reactions, including photo-fries rearrangements, Norrish/Yang photo- cyclization, dimerization of 9-substituted anthracenes and asymmetric photoreactions within the confined media is reviewed and the general rules are summarized for microreactor-controlled selectivity of the pho- tochemical transformations.

Incompatible deformation model of materials with damage;