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E-Material, also called E Material, is a metal matrix composite consisting of beryllium matrix with beryllium oxide particles. It has high thermal conductivity (210-230 W/m K), and its thermal expansion can be adjusted to match other materials, e.g. silicon and gallium arsenide chips and various ceramics .
An electronic document is a document that can be sent in non-physical means, such as telex, email, and the internet. [1] Originally, any computer data were considered as something internal—the final data output was always on paper.