منابع مشابه
Electromagnetic radiation field of an electron avalanche
Article history: Received 4 February 2011 Received in revised form 1 June 2011 Accepted 2 June 2011 Electron avalanches are the main constituent of electrical discharges in the atmosphere. However, the electromagnetic radiation field generated by a single electron avalanche growing in different field configurations has not yet been evaluated in the literature. In this paper, the electromagnetic...
متن کاملElectromagnetic radiation.
Electromagnetic fields (EMF) are ubiquitous in modern society. It is well known that exposure to strong fields can result in acute effects, such as burns; the mechanisms behind such effects are well established. There is, however, also a concern that long-term exposure to weak fields might have health effects due to an as-yet unknown mechanism. Because of the already widespread exposure, even s...
متن کاملElectromagnetic Radiation and Epilepsy
People report adverse health symptoms which they attribute to the radiation of microwave signals from mobile phone and TETRA masts. The validity of such reports cannot be safely rejected, either on the grounds of current safety compliance, nor on the grounds that such symptoms cannot be replicated in laboratory experiments in search of a simplified mechanism. Biological effects caused by such e...
متن کاملOut-of-equilibrium electromagnetic radiation
We derive general formulas for photon and dilepton production rates from an arbitrary non-equilibrated medium from first principles in quantum field theory. At lowest order in the electromagnetic coupling constant, these relate the rates to the unequal-time in-medium photon polarization tensor and generalize the corresponding expressions for a system in thermodynamic equilibrium. We formulate t...
متن کاملOptimal concentration of electromagnetic radiation
For complete spherical concentration of light the maximum theoretically possible total energy density for a given power input can be, in principle, achieved by appropriate choice of polarization and angular amplitude variation. Illumination of a focusing system with a plane-polarized wave creates at the focus equal electric and magnetic energy densities . By appropriate choice of radial variati...
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ژورنال
عنوان ژورنال: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science
سال: 1921
ISSN: 1941-5982,1941-5990
DOI: 10.1080/14786442108636200