The reason was that, in high applied voltage, the average intensity of electric field was higher than that of external electric field for the ionization of impurities and defects.
这是由于杂质和缺陷电离产生的局域电场导致发光层中的平均电场强度和外电加电压不成线性关系，此平均电场强度高于外电场强度。
Many factors such as morphological parameters, specimen species and applied electric field affect space charge properties of polyethylene under high electric field.
微观形态、试品种类、外加电场等因素都会影响高场强下聚乙烯空间电荷特性。
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