ULF


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ULF

abbr.
ultralow frequency
References in periodicals archive ?
2013) ULF magnetic field depression as a possible precursor to the 2011/3.
2006) Seismo-ionospheric depression of the ULF geomagnetic fluctuations at Kamchatka and Japan.
1995) Gen eration of ULF electromagnetic emissions by microfracturing.
Compared with these ionospheric phenomena, the number of reports is not so abundant for ULF (ultra low frequency) electromagnetic emissions, even though they were found promising for short-term EQ prediction.
13,14) This paper is an attempt to apply the natural time method to our ULF geomagnetic data observed in Japan, especially during a period of a few months before the 2011 Tohoku EQ.
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.
mil/news-events/2016-12-16) statement released Friday, DARPA announced that its scientists were working to create portable ULF and VLF transmitters as part of its "A Mechanically Based Antenna" (AMEBA) effort.
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.