Electromagnetic emission

Electromagnetic earthquake forerunners show themselves like the electromagnetic phenomena, including electromagnetic emission (EME) in a radio frequency range. This emission caused by collective exiting of the set of local mechano-electrical transformers (MET). The excitation mechanism inside the crust is determined by the fact that elastic tension ranges up to the threshold level within the source area. 

RE is usually detected with a coil antenna, with or without a ferrite core, placed near the sample. This antenna couples to the changing B fields associated with electromagnetic emissions. RE is especially interesting, as it is often associated with electrical discharges within the crack and on the fracture surfaces. 

Guo Ziqiang, Luo Xianglin, Qian Shuqing. 1999. Electromagnetic emissions during quarry blasting. Chinese Journal of Geophysics, 42(6) 834-840. 

Wan Guoxiang. 2008b. Study on the characteristics of the electromagnetic emission and acounstic emission in rock under stress wave. Changsha Central South University 15-67. 

Yoshino T, Tomizawa I. 1989. Observation of low-frequency electromagnetic emissions as precursors to the colcanic eruption at Mt. Mihara during November, 1986. Phys Earth Planet Inter 1 2. 

Experimental apparatus Electromagnetic emission source, electromagnetic energy meter (tesla), high frequency mechanical wave recorder, coal and rock strain recorder, methane, ethane, carbon monoxide sensors, data logger. 

Nitson U. Electromagnetic Emission Accompanying Fracture of Quartz-bearing Rocks[J]. Geophys. Res. Ietterl977, 4 333 336. 

TAYLOR, C. (1993) Electromagnetic emissions from computer monitors . Computer Education, 73, pp. 18-21. 

Chris Taylor is a lecturer in education at the University of Exeter. His specialist area is ICT, with a particular interest in primary education. He previously was a primary class teacher and worked in the Computer Advisory Service for Kent County Council. A particular concern is the potential health risk of VDU equipment, and he has undertaken research looking at electromagnetic emissions from computers commonly used in education. 

Radiation. Radiation (implying ionising radiation) describes both electromagnetic emission (X-rays and gamma rays) and particulate emission (alphas, betas and neutrons). 

A. Fraser and A. H. Frey, Electromagnetic Emission at Micron Wavelengths from Active Fibers, Biophys. J. 8, 731-734 (1968). 

FIGURE 5 The dependence graphics from the altitude h of the signal/noise function for the insects with different vision types a) trichromatic, b) monochrome, c) dichrome and for the electromagnetic emission selective sources (H- halogen tube, X- xenon lamp, T- tungsten lamp at T= 1500K, x=4m, N ). 

From the graphics analysis at the Fig. 7, it follows that for all natural surfaces weight coefficients sets there is the dependence of the signal/ noise function maximum value from the electromagnetic emission selective source altitude above the Earth surface. Signal/noise fimction reaches its maximum at the altitude = 4i, than it has a steady decreasing character. Also for all vision types there is a vivid dependence from the random set of the natural surfaces weight coefficients. 

The optimal parameters of the related position of the monitoring signal source and receiver of the insects with different and of the electromagnetic emission artificial selective source were calculated ... 

Atomic Emission Spectrophotometry—Analysis by detection and quantification of the characteristic electromagnetic emissions from atoms in a sample. 

Radiation cooling, the transfer of heat by electromagnetic emission, primarily in the infrared wavelengths (0.1-100 pm), does not require a transport medium. All objects with a temperature above 0 K emit thermal radiation. 

Low-frequency electromagnetic waves (RE—for radiowave emission) were detected with coil antennas placed a few mm from the sample. Such an antenna couples to a changing B field. It should be emphasized that this arrangement detects the near-field electromagnetic emission because of the close proximity of the coils to the source. A simultaneous burst of visible photons coincident with the observed RE burst reinforces the interpretation that these signals are caused by microdischarges. 

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