Abstract

1.はじめに マグネットは半永久的に磁界を発生しているが,対照的に半永久的な電界を与える物質をエレクトレットと呼んでいる。磁界や電界は特に電気機械におけるエネルギー変換の場として働くものであるから,外部からエネルギーを与えることなしに場を提供してくれる材料は,極めて有用な

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