Investigation into Layer Number Effect on Breakdown Strength of Multi-Layer Polymer Films

Abstract

The layer number effect on electric breakdown strength (EBD) of multi-layer polymer films is investigated using 10-μm polypropylene (PP) films under a dc condition. The layer number, n, of the films during the test is as large as 120. It is observed that the relation between EBD and n conforms to a minus power law, i.e., EBD(n) = E1′n−a, where the power exponent, a, is 0.27, E1′ is a constant. By reviewing the experimental data in references, it is found that the power law holds true for different types of polymers in different test conditions, but the value of a varies from 0.072 to 0.5. The variation of a is explained in perspective of the discontinuous structures within films and those between films. A small value of a means a good purity level of the film, which is due to the decrease of the size of the inter-layer defects. A large value of a means a poor purity level of the films, which is due to the increase of the amount of intra-layer defects. Both factors influence the value of a, leading to the variation of a.

TodBR: Target-Oriented Dialog with Bidirectional Reasoning on Knowledge Graph

“…Our approach utilizes a multi-layer Transformer to encode the dialog context. Previous work [42,43] has proven that a multi-layer structure is highly effective in capturing semantic information, which offers parameter efficiency and feature abstraction, outperforming alternatives like single-layer Transformers or sequential models, such as RNNs or LSTMs, and proving well suited for tasks demanding comprehensive dialog comprehension.…”