Recording of pulsed electromagnetic radiation in the radio-frequency range during the heating of periclase and technical glass

1977 ◽  
Vol 20 (4) ◽  
pp. 527-532 ◽  
Author(s):  
S. M. Brekhovskikh ◽  
A. A. Vorob'ev ◽  
E. K. Zavadovskaya ◽  
V. N. Sal'nikov ◽  
M. V. Korovkin
Keyword(s):  
Radio Frequency ◽  
Electromagnetic Radiation ◽  
Frequency Range ◽  
Technical Glass ◽  
Pulsed Electromagnetic

Mathematical model for temperature estimation forecasting of electrically conductive plate elements under action of pulsed electromagnetic radiation of radio-frequency range

2020 ◽  
Vol 8 (1) ◽  
pp. 35-42
Author(s):  
R. S. Musii ◽  
◽  
A. Y. Nakonechnyy ◽  
Keyword(s):  
Mathematical Model ◽  
Energy Dissipation ◽  
Radio Frequency ◽  
Electromagnetic Radiation ◽  
Radio Pulse ◽  
Plate Element ◽  
Frequency Range ◽  
Electrically Conductive ◽  
Conductive Plate ◽  
Pulsed Electromagnetic

A mathematical model for determining the temperature of an electrically conductive plate element under the action of pulsed electromagnetic radiation of the radio-frequency range is proposed. This model allows us to take into account the influence of the process of thermoelastic energy dissipation on the forecasting of the value of temperature in addition to the joule heat. This process is determined by thermal expansion and the action of poendromotive forces arising in the element. This approach allows us to predict a decrease in the error of temperature determination. On this basis, the distributions of temperature in an electrically conductive plate element under the action of an amplitude-modulated radio pulse have been investigated numerically. Thermoelastic energy dissipation is taken into account when using the frequencies of the carrying electromagnetic oscillations beyond the resonant frequencies and of the first resonant frequency of the electromagnetic field for this element. An estimate of the influence of the process of taking into account mechanisms of energy dissipation on the total value of temperature in the element at the specified action and used frequencies is obtained. This has allowed us to increase the accuracy of temperature measurements in this element.

scholarly journals Evaluation and Substantiation of the Necessity to Revise Guidelines for Measuring Electromagnetic Radiation of Cellular Base Stations

2020 ◽  
pp. 29-35
Author(s):  
N.V. Zaitseva ◽  
T.S. Ulanova ◽  
A.L. Ponomarev ◽  
O.A Molok ◽  
A.A. Odegov
Keyword(s):  
Radio Frequency ◽  
Electromagnetic Radiation ◽  
Mobile Communications ◽  
Biological Effects ◽  
Current Method ◽  
Base Stations ◽  
Measuring Instruments ◽  
Frequency Range ◽  
Residential Areas ◽  
Negative Effect

Introduction: Measurements of electromagnetic radiation of the radio frequency range are of great relevance due to the increasing number of transmitting radio facilities in the densely populated territories, constant cell site upgrades, and emerging communication standards. The paper presents a brief description of the biological effects of radio frequency electromagnetic radiation and shows basic mechanisms of the negative effect on the most vulnerable organs and systems. Our objective was to evaluate valid guidelines for measuring electromagnetic radiations of the radio frequency range in residential areas, in houses and public buildings. Materials and methods: We reviewed specific characteristics of cellular base and radio relay stations, compared and described electromagnetic radiation measuring devices. The provided recommendations for their selection were based on frequencies at which the communication equipment operates. We also analyzed the current guidelines with account for characteristics of transmitting radio equipment of cellular base stations and the applied measuring instruments. Results: The results of assessing established significant differences are discussed. The analysis of the requirements for measurements demonstrated significant discrepancies and contradictions between the valid documents. The evaluation results demonstrated impossibility of simultaneous measurements of electromagnetic radiation from cellular BS and RRS due to violations of requirements for measurement procedures. We concluded that, according to the current method documents, measurements of electromagnetic radiation from the fourth (4G) and fifth (5G) generation mobile communications systems were not possible. Conclusions: We revealed the necessity to revise the compared guidelines МUК 4.3.1167–02 and МUК 4.3.1677–03, to harmonize regulatory requirements for measurements, and to develop a single document guiding measurements of radio frequency electromagnetic radiation. Recommendations for taking measurements are provided.

Damage to the cornea of the eye when exposed to high-intensity electromagnetic radiation of the radio frequency range

2020 ◽  
Vol 60 (9) ◽  
pp. 624-626
Author(s):  
Andrey M. Aminov ◽  
Nikolay N. Gavrish
Keyword(s):  
Radio Frequency ◽  
Electromagnetic Radiation ◽  
High Intensity ◽  
Clinical Manifestations ◽  
Average Energy ◽  
Microwave Range ◽  
Frequency Range ◽  
Short Term ◽  
Eyes Closed ◽  
Short Term Exposure

An experimental assessment of the clinical manifestations of corneal injuries of the rabbit-eyed eyes closed under the influence of high-intensity electromagnetic radiation (EMR) in the microwave range was carried out. Similar studies have been conducted when exposed to high-intensity EMR ultrahigh frequency (UHF) on the open eye of a rabbit. Dose- and frequency-dependent changes in the cornea of the rabbit eye exposed to EMR frequencies of 3.97 GHz and 1.27 GHz with an average energy flux density (EFD) of 1 W/cm2 were revealed. It has been established that a high-intensity direct short-term exposure to a microwave EMF can lead to damage to even a closed eye. Radiation of the UHF range, which is close in intensity and exposure, in addition to direct damage to the cornea of the open eye, causes slight damage to the external structures of the open paired eye, which is not directly affected. The aforementioned necessitates the development of means and methods of individual protection of the organ of vision of personnel for protection against short-term exposure to powerful electromagnetic radiation of the radio frequency range.

ASSESSMENT OF THE SENSITIVITY OF THE HUMAN ORGANISM TO THE EFFECT OF ELECTROMAGNETIC RADIATION OF RADIO FREQUENCY RANGE

2017 ◽  
Author(s):  
Liubov Sergeeva ◽  
◽  
Oleksandr Valchenko ◽  
Viktoriia Sergeeva ◽  
Oleksandr Koval ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Radio Frequency ◽  
Electromagnetic Radiation ◽  
Human Body ◽  
The Body ◽  
Human Organism ◽  
Frequency Range ◽  
Individual Sensitivity ◽  
Screening Procedures ◽  
The Individual

The implementation of the effects of any electromagnetic radiation depends on the individual sensitivity of the human body. To determine the criteria for assessing the individual sensitivity of the human body to the action of non-ionizing electromagnetic radiation in the radio frequency range (EMF RF-range), medical examination, anthropometric and physiological parameters, screening procedures of Beyton, Shmishek, orthostatic tests and other peripherals were performed. After a survey and questionnaire of students, which indicated how many years they used IT-technologies, a comparative analysis of the pre- nosological manifestations of adverse effects on the body of EMR RF.

Biological effects of low-intensity radiofrequency fields and risk assessment for biota

2020 ◽  
Vol 60 (9) ◽  
pp. 592-596
Author(s):  
Elena I. Sarapultseva ◽  
Darya V. Uskalova ◽  
Ksenya V. Ustenko
Keyword(s):  
Radio Frequency ◽  
Electromagnetic Radiation ◽  
Electromagnetic Fields ◽  
Negative Impact ◽  
Biological Effects ◽  
High Sensitivity ◽  
Communication Technologies ◽  
Natural Ecosystems ◽  
Low Intensity ◽  
Different Levels

Despite the fact that there are still conflicting opinions about the damage caused by modern wireless communication technologies, most scientists report on the negative biological effects of low-intensity radio frequency electromagnetic radiation at different levels of the organization of live nature. There is no doubt that there is a need not only for a sanitary and hygienic assessment of man-made electromagnetic effects on humans, but also for an environmental assessment for biota. The purpose of the study was to assess the potential environmental risk of electromagnetic impact in the centimeter range on natural ecosystems. The initial data were the authors' own results in the field of radiobiology of non-ionizing radiation, as well as published of other researchers. The article analyzes the biological effects of radio frequency electromagnetic fields detected in organisms of different systematic groups and levels of organization. The data on the non-thermal biological effects of electromagnetic fields indicate a high sensitivity of different species to this factor. The analyzed research results emphasize the need to take into account the features of non-thermal effects of electromagnetic radiation on biota, since these radiations can have a negative impact on different hierarchical levels in natural ecosystems.

Sign in / Sign up

Export Citation Format

Share Document