radio frequency


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Related to radio frequency: Radio Frequency Identification, Radio waves

frequency

 [fre´kwen-se]
1. the number of occurrences of a periodic or recurrent process in a unit of time, such as the number of electrical cycles per second measured in hertz. In cardiac pacing terminology, frequency is expressed by the formula: frequency = ½ × pulse width.
2. the number of occurrences of a particular event or the number of members of a population or statistical sample falling in a particular class.
radio frequency the range of frequencies of electromagnetic radiation between 10 kilohertz and 100 gigahertz, used for radio communication.
relative frequency the ratio of the number of occurrences of a specified phenomenon in a population to the total size of the population.
urinary frequency urination at short intervals without increase in daily volume of urinary output, due to reduced bladder capacity or cystitis.

radio frequency

An MRI term for an electromagnetic wave with a frequency in the same range as that used for transmitting radio and television signals. The RF pulses used in MRI are usually in the 1–100 megahertz range, which cause heating of a structure or tissue due to RF pulse absorption.
References in periodicals archive ?
Another important value provided by a radio frequency assignment is a record of spectrum use.
But those cracks should have been found during routine quarterly radio frequency radiation leakage testing.
Loss prevention: A worker's clothes fitted with radio frequency identification tags could prevent him from entering a restricted area without necessary safety equipment.
Automated systems, including Integrated Computerized Deployment System, Worldwide Port System, Intelligent Road/Rail Information Server, and Radio Frequency Identification, were leveraged and integrated in new and innovative ways, he said.
The radio frequency emissions surrounding the cars' antennas was tested while each car was parked with the ignition switch in three positions: on, start and engine running.
1, 2000 with radio frequency radiation exposure guidelines for all wireless facilities.
It uses radio frequency to scan or communicate its data.
RFID Journal is the leading source of news and in-depth information about radio frequency identification (RFID) and its many business applications.
radio frequency spectrum is allocated among federal and non-federal services, and use is governed by different organizations.
Radio frequency identification technology provides automated, real-time logistics and information on Class 1 and other classes of supply for the Defense Department.
Holder, Commander of the Navy's Military Sealift Command from 1999-2001, said use of the Radio Frequency Identification tags is already saving defense dollars.
But next year in Europe, felons with a fondness for Fords may find their efforts thwarted by tiny radio frequency transponders concealed in ignition keys.

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