Library & information science

Library & information science

A multidisciplinary field that focuses on the practices, tools of management, information technology, education, and other perspectives to libraries; the collection, organization, preservation, and dissemination of information resources; and the political economy of information.

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Harmoniku

Lights & lighting; Lighting products

Integrāls pamattiesību frekvenci (60 Hz), kas kļūst pašreizējā sastāvdaļa.

harmoniskais kropļojums

Lights & lighting; Lighting products

Traucējumus, AC līknes, kas rada pamattiesību biežums (harmonics) reizinājumus. Tripleta nepāra harmonikas (trešdaļas, ninths utt.) var izraisīt lielu strāvu neitrāla rindā Wye ...