hum

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Related to hums: Huns, UHMS

hum

Electronics an undesired low-frequency noise in the output of an amplifier or receiver, esp one caused by the power supply
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Hum

 

the name given during the Middle Ages to the region between Dubrovnik and the Neretva River. The earliest surviving reference to Hum dates from the 10th century and describes the region as subject to the Serbian prince Mihajlo Višević. Late in that century the region became part of Samuil’s state, and in 1018 it fell under Byzantine control. Hum became part of Zeta in the second half of the 11th century, part of the Nemanja state in the late 12th century, and part of Bosnia in the 1320’s. Duke (herceg) Stepan Vukčić took control of Hum in the 1440’s. The duke’s dominions, of which Hum constituted a major part, became known as Hercegovina in the mid-15th century.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

hum

[həm]
(electricity)
A sound produced by an iron core of a transformer due to loose laminations or magnetostrictive effects; the frequency of the sound is twice the power line frequency.
(electronics)
An electrical disturbance occurring at the power supply frequency or its harmonics, usually 60 or 120 hertz in the United States.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
And yet we're still only beginning to understand our planet's hum. And scientists have been limited for years because they only knew how to measure it from land, while nearly three-quarters of the globe is underwater.
Jean McLeish THROUGHOUT this summer Aberdeen people were asked to hum to help create a piece of music that will be showcased during the city's annual Sound Festival.
As part of the new agreement, Transworld Aviation will offer operators Honeywell's Zing Hums 1100/1200/1400 series.TWA is ideally suited as Honeywell's distributor of choice with its long-standing experience insupplying aircraft parts within the UAE.
The computer system will collect aircraft data from whatever HUMS system the Army chooses for the new CH-47E The Army is defining the requirements for a Chinook HUMS that will lead to a competitive procurement.
Maintenance officers, pilots, commanders, and safety and standards officers view data collected by the IMD HUMS. The information collected shows restrictions, inefficiencies, inspections, and service schedules of aircraft.
In Washington, Assistant Secretary of State Jeffrey Feltman told the Senate Foreign Relations Committee the Assad regime had "intensified its vicious campaign of attacks against the Syrian people today's reports from Hums are truly alarming.
The gas can be used in place of naphtha as a feedstock for producing ammonia/urea at a nitrogenous fertiliser plant in Hums. Clean gas can also be supplied to a 600MW power station and a steel complex at Zara', near Hums.
This is why the battles for Hums will be particularly bloody in the coming weeks and/or months.