While double negation is still found in the Low Franconian dialects of west Flanders ( e. g., Ik ne willen da nie doen, " I do not want to do that ") and in some villages in the central Netherlands such as Garderen, it takes a different form than that found in Afrikaans.

Legend: γ = Gamma ray s HX = Hard X-ray s SX = Soft X-Rays EUV = Extreme-ultraviolet NUV = Near-ultraviolet Visible light ( colored bands ) NIR = Near-infrared MIR = Moderate-infrared FIR = Far-infrared EHF = Extremely high frequency ( microwaves ) SHF = Super-high frequency ( microwaves ) UHF = Ultrahigh frequency ( radio waves ) VHF = Very high frequency ( radio ) HF = High frequency ( radio ) MF = Medium frequency ( radio ) LF = Low frequency ( radio ) VLF = Very low frequency ( radio ) VF = Voice frequency ULF = Ultra-low frequency ( radio ) SLF = Super-low frequency ( radio ) ELF = Extremely low frequency ( radio )

Extremely Low Frequency ( ELF ) –

de: Extremely Low Frequency

Individuals who were born Very Low Birth Weight (< 1500 grams ) and Extremely Low BirthWeight ( ELBW ) are at greater risk for various cognitive deficits including planning ability.

They also maintain the Project's clandestine Extremely Low Frequency systems that very slowly accumulate Prime Base's messages, such as briefings, for teams to read when they awaken — thus counterbalancing the minuscule data rate.

Another conflicting designation which includes this frequency range is Extremely Low Frequency ( ELF ), which refers to frequencies from 3 to 300 hertz.

* Extremely Low Frequency Transmitter Site Clam Lake, Wisconsin, a " Fact File " published by the US Navy ( PDF File )

Related definitions include Very Low Birth Weight ( VLBW ) which is less than 1500 g, and Extremely Low Birth Weight ( ELBW ) which is less than 1000 g. Normal Weight at term delivery is 2500 g-4200 g.

The first flight of an American Hall thruster on an operational mission, was the Aerojet BPT-4000, which launched August 2010 on the military Advanced Extremely High Frequency GEO communications satellite.

* Extremely High Frequency, a radio frequency band

This type of therapy is called Millimeter Wave ( MMW ) Therapy or Extremely High Frequency ( EHF ) Therapy.

In August 2010 control of the Milstar system was transferred to the Advanced Extremely High Frequency program, in preparation for the launch of the first AEHF satellite, USA-214.

Advanced Extremely High Frequency satellites are intended to replace Milstar.

** AEHF Advanced Extremely High Frequency

It operates and supports satellite programs including the Global Positioning System, the Defense Satellite Communications System, Wideband Global SATCOM, Milstar, Advanced Extremely High Frequency, Space Based Space Surveillance, Tactical Satellite-3, Space Tracking and Surveillance System Advanced Technology Risk Reduction Satellite and the worldwide Air Force Satellite Control Network.

During this time Very Low Frequency ( 3 – 30 kHz ) signals will be reflected by the D layer instead of the E layer, where the increased atmospheric density will usually increase the absorption of the wave and thus dampen it.

The first is through VLF ( Very Low Frequency ) radio waves launched into the magnetosphere.

Following public concern, the U. S. Defense department was ordered by the 9th Circuit Court to strictly limit use of its Low Frequency Active Sonar during peacetime.

* 140A-Equipment Technical Design Standards For Common Long Haul / Tactical Radio Communications In The Low Frequency Band And Lower Frequency Bands

A gap between the inner and outer Van Allen belts, sometimes called safe zone or safe slot, is caused by the Very Low Frequency ( VLF ) waves which scatter particles in pitch angle which results in the gain of particles to the atmosphere.

Elves is an acronym for Emissions of Light and Very Low Frequency Perturbations from Electromagnetic Pulse Sources.

* An induction magnetometer, provided by the University of Tokyo, that measures the changing geomagnetic field in the Ultra Low Frequency ( ULF ) range of 0 – 5 Hz.

Magnetometers used in the Earth sciences are called geophysical surveys, a term that also embraces a wide range of other geophysical techniques including gravity, seismic refraction, seismic reflection, electromagnetics ( EM ), induced polarisation ( IP ), magneto-tellurics ( MT ), controlled source magneto-tellurics ( CSAMT ), sub-audio magnetics ( SAM ), mise-a-la-masse, resistivity, self Potential ( SP ) and Very Low Frequency ( VLF ).

Until 1995, there was the Silver Creek Communications Annex 41 ° 20 ' 46. 00 " N 97 ° 43 ' 18. 18 " W a station of the Survivable Low Frequency Communications System of the United States Air Force.

* A Blue Gene / P system is the central processor for the Low Frequency Array for Radio astronomy ( LOFAR ) project in the Netherlands and surrounding European countries.

* Multichannel support-up to 5 full range audio channels and an LFE-channel ( Low Frequency Enhancement channel )

These tags are commonly known as LFID's or LowFID's ( Low Frequency Identification ).

sv: Low Frequency

* LFO-A Low Frequency Oscillator may or may not be voltage-controlled.

* Survivable Low Frequency Communications System ( SLFCS )

Before the bass management system there is a Low Frequency Effects ( LFE ) channel.

( Movie and DVD soundtracks can be mixed down to four or more tracks, as needed, the most common being five tracks, with an additional Low Frequency Effects track, hence the " 5. 1 " surround sound most commonly available on DVDs.

* Jacobsen, Trond, " ZEVS, the Russian 82 Hz ELF transmitter: An Extrem Low Frequency transmission-system, using the real longwaves " ALFLAB, Halden, Norway.

In addition, terrestrial radio positioning systems utilizing an LF ( Low Frequency ) switched packet radio network were also used as an alternative to GPS based systems.

While there are currently no results, there are a few projects underway which hope to make headway in this area in the near future, such as the Precision Array for Probing the Epoch of Reionization ( PAPER ), Low Frequency Array ( LOFAR ), Murchison Widefield Array ( MWA ), Giant Metrewave Radio Telescope ( GMRT ), and the Large-Aperture Experiment to Detect the Dark Ages ( LEDA ).