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

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.

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.
References in periodicals archive ?
Hums that people usually hum to themselves or to someone who is very close to them - why not collect those and give them back?
Advanced HUMS functionality meeting CAA CAP753 and CAP739 requirements
Honeywell's Hums products have helped US Army AH-64 Apache helicopters reduce mission aborts by 30 per cent, maintenance test flights by 20 per cent and scheduled maintenance by 5 to10 per cent.
Already, a battle is occurring in Hums every two to three days.
The combination of a ground-based maintenance management system and helicopter-borne HUMS will monitor transmission, drive-train and control components in specific missions and theaters.
The cost of IMD HUMS installation is $150,000 per helicopter.
Not only will the IMD HUMS create changes for aircraft maintenance, but the system could also affect operations.
Hoy and his co-authors group the island sounds into four song types; the click-song, a complex pattern of short pulses followed by a trill of sound, a purr made of steady sound pulses and a low hum.
As with all previous IAC HUMS, the new SuperHUMS[TM] product line will provide users with the ability to remotely reconfigure their HUMS anywhere in the world.
The new integration with Honeywell's Zing HUMS creates a cost-effective way to increase operational efficiency, simplify in-flight mission management and enhance crew safety.
Some of the gas can be used as fuel by the Hums oil refinery (see the oil refining sector in Downstream Trends No.
This is why the battles for Hums will be particularly bloody in the coming weeks and/or months.