ULF


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ULF

abbr.
ultralow frequency
References in periodicals archive ?
If we are successful, scuba divers would be able to use a ULF channel for low bit-rate communications, like text messages, to communicate with each other or with nearby submarines, ships, relay buoys, UAVs, and ground-based assets, through-ground communication with people in deep bunkers, mines, or caves could also become possible," AMEBA Program Manager Troy Olsson from DARPA's Microsystems Technology Office said in the statement.
In order to achieve this, the new VLF and ULF antennas would generate radio signals by mechanically moving materials harboring strong electric or magnetic fields, rather than relying on electronic circuits and power amplifiers to create oscillating electric currents.
The ULF data were obtained from the World Data Center (WDC) for Geomagnetism, Kyoto.
We use ULF data from three magnetic observatories belonging to JMA (Japan Meteorological Agency): Memambetsu (MMB) (geographic coordinates: at 43[degrees]54'36"N, 144[degrees]11'19"E), Kakioka (KAK) (at 36[degrees]13'56"N, 140[degrees]11'11"E), and Kanoya (kNY) (at 31[degrees]25'27"N, 130[degrees]52'48"E) as shown by black diamonds in Fig.
On the other hand, ULF variations are not a point process, but they are continuous in nature, so that we have to think of what kind of ULF parameters should be used for the natural time analysis.
We take, as the first step, the following procedure on ULF magnetic data to be used for the natural time analysis.
The following ULF parameters are generated to characterize the ULF magnetic data.
Los diferentes programas de investigacion internacional se enfocan principalmente a los aspectos electromagneticos (EM) como el metodo VAN (que es la medida del geopotencial de la tierra) desarrollado en Grecia, asi como todas las posibles senales electromagneticas en un amplio rango de frecuencias desde la banda ULF (Ultra Low Frequencies) hasta la banda VHF (Very High Frequencies).
algunos resultados convincentes fueron reportados en ULF, Fraser-Smith et al.
Es importante hacer notar la presentacion de trabajos respecto a prediccion sismica en la reunion anual de la Sociedad Geofisica Europea llevada a cabo en Niza en abril de 2002, EGS (2002), en la cual se considera con bastante aceptacion el uso de senales ULF como precursores de terremotos.
Por otro lado los estudios en DC y ULF requieren estaciones localizadas en areas amplias donde pueden participar diferentes universidades.
As such, the ULF Fund has similarly experienced a high level of redemptions, initially resulting in extended weighted-average maturity (WAM) and reduced net asset value (NAV).