Earth science

Earth science

Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.

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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 ...