By James C. Lin
As instant know-how turns into extra subtle and available to extra clients, the interactions of electromagnetic fields with organic platforms have captured the curiosity not just of the medical group but in addition most of the people. unintentional or deleterious organic results of electromagnetic fields and radiation might point out grounds for well-being and defense precautions of their use. Spanning static fields to terahertz waves, Electromagnetic Fields in organic structures explores the variety of outcomes those fields have at the human physique. With contributions via an array of specialists, subject matters mentioned contain: crucial interactions and box coupling phenomena, highlighting their significance in learn on organic results and in clinical, commercial, and scientific purposes electrical box interactions in cells, concentrating on ultrashort, pulsed high-intensity fields The influence of publicity to evidently happening and human-made static, low-frequency, and pulsed magnetic fields in organic structures Dosimetry or coupling of super low frequency (ELF) fields into organic structures and the historic advancements and up to date traits in numerical dosimetry cellular communique units and the dosimetry or coupling of radiofrequency (RF) radiation into the human physique publicity and dosimetry linked to magnetic resonance imaging (MRI) and spectroscopy to be had facts at the interplay of terahertz radiation with organic tissues, cells, organelles, and molecules there's nice capability for verbal exchange, business, medical, and clinical use of electromagnetic fields and radiation. to assist improve wisdom of the organic results of such fields and to take advantage of their strength scientific purposes, this e-book highlights severe matters on the subject of their results on dwelling structures.
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Extra resources for Electromagnetic Fields in Biological Systems
20 Electromagnetic Fields in Biological Systems • Electric and magnetic fields are decoupled inside a biological body. • Magnetic fields inside a body are equal to the field applied externally. • Electric fields applied through air are weakened by a factor of 10 −8−10−6 upon penetration into biological tissues. • Electric fields in the immediate vicinity of the biological body are perpendicular to the surface of the body. • Electric fields are enhanced near the surface at points of sharp curvatures.
In the radiative region, which is the region closer than 2D2/λ, the radiated power varies with distance from the antenna. The space surrounding the antenna where the reactive component predominates is known as the reactive region. The precise extent of the regions varies for different antennas. 4D2/λ (Lin 2000). For the short dipole, the reactive component predominates up to a distance of approximately λ/(2π) at which the radiative and reactive components are equal to each other. However, the outer limit is of the order of a few wavelengths or less in most cases.
Note the comparable values of SAR and power absorbed in the head and hand of a user obtained from realistic and idealized phone models. It is observed that using an incorrect model for the phone case could lead to overestimating the SAR value averaged over 1 or 10 g by as much as three times (Pisa et al. 2005). 1 Source: Gandhi, O. , G. Lazzi, A. Tinniswood, and Q. S. Yu. 1999. Bioelectromagnetics 20 (Suppl 4): S93–S101. , A. Christ, T. Kellom, S. Seidman, N. Nikoloski, B. Beard, and N. Kuster.