Abstract
Background. One of lacks of the use of high technologies is the megascopic level of unfavorable electromagnetic smog. Therefore, the study of influencing of the external electromagnetic field (EMF) is actual, within the limits of wide row of frequencies, on man's organs and brain. Objective. Modeling of influences on the brain of electric induction arising up at penetration of the EMF of a different frequency in the reserved sphere. Methods. A mathematical model of the EMF influence on human brain is considered. Namely, the model of a multi stratified sphere as an approximation of a human head is proposed. This sphere embedded into the unlimited nonconductive space (σ 0 = 0) of the dielectric constant e 0 . Skin and bones of head have a magnetic permeability of vacuum μ 0 . Influences on a brain are given as induction of the electric field, arising up at penetration of the variable electromagnetic field in the reserved sphere. Results. The results of numerical calculations for the three-layered model of head showed that induced of the electric field in the layer of brain has increased on the frequencies 10 7 –10 8 Hz of external EMF. Distributions on the sphere of electromagnetic fields with f ≤ 10 6 Hz leave their amplitudes by unchanged regardless of depth of penetration. Fading of amplitudes shows up only for frequencies 10 7 and 10 8 Hz. Conclusions. Exposed in a model changes of electromagnetic waves on the frequencies 10 7 –10 8 Hz can activate the parameters central nervous system and brain, that substantially will affect of man's activity. Will allow the further study of influencing of the electromagnetic field of a different frequency to identify to extent of brain activity, and also stress, positive and negative influencing of external EMF.
Highlights
The results of numerical calculations for the three-layered model of head showed that induced of the electric field in the layer of brain has increased on the frequencies 107–108 Hz of external electromagnetic field (EMF)
One of the modern high-tech society features is an enhanced level of the electromagnetic unfavorable background known as the electromagnetic smog, which is one of the modern high-tech society disadvantages and the presence of such induced electromagnetic fields within the broad range of frequencies must be taken into account since these different frequencies electromagnetic field background is quite typical for the environment
The thermal bioeffects are specified by heating of tissues when the enhanced temperature of 0.1 C is indicated in the biological object studied due to the exposure of the super high frequency (SHF) electromagnetic field characterized by the power amplitude of more than 10 mW/cm2
Summary
One of the modern high-tech society features is an enhanced level of the electromagnetic unfavorable background known as the electromagnetic smog, which is one of the modern high-tech society disadvantages and the presence of such induced electromagnetic fields within the broad range of frequencies must be taken into account since these different frequencies electromagnetic field background is quite typical for the environment. Its influence on a human organism, especially on the human brain, especially within a super high frequency (SHF) range (f = 15–750 MHz), is of immense scientific interest [1, 2] This topic is being investigated for a longer time, there is the most harmful difficulty in the field studied. As far as the influence of superhigh-frequency radiations on biological objects is concerned, no the unified approach is proposed to investigate this complicated problem yet In spite of this fact, numerous theoretical and experimental case studies were carried out during the last decades as reviewed in [1, 3]. The results of numerical calculations for the three-layered model of head showed that induced of the electric field in the layer of brain has increased on the frequencies 107–108 Hz of external EMF.
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