This work was supported by the National Natural Science Foundation of China(Grant No.50277026);theKey Program of Minis try of Education of China(Grant No.02100);the 973 Project of Ministry of Science and Technology of China(Grant No.2001CB610406).
Pressure wave propagation (PWP) method was utilized to observe the space charges packet-like behavior in sheet samples of low-density polyethylene (LDPE) under the relative low electric field. The experimental results...