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    Wyświetlanie 1-2 z 2
    Tytuł:
    Study on the distribution of SAR and temperature in human brain during radio-frequency cosmetic treatment
    Autorzy:
    Qi, Xinzhe
    Lu, Mai
    Powiązania:
    https://bibliotekanauki.pl/articles/1841322.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electromagnetic exposure
    human head model
    ICNIRP guidelines
    radiofrequency cosmetic instruments
    safety assessment
    ekspozycja elektromagnetyczna
    model ludzkiej głowy
    wytyczne ICNIRP
    ocena bezpieczeństwa
    Opis:
    This paper established a radio-frequency electrode model and human head modelused in RF cosmetic instruments. The distribution of electric field strength, a specific absorption rate (SAR), and temperature distribution in the human brain at 1 MHz and 6 MHz were studied and the results compared with the International Commission on Non-ionizing Radiation Protection (ICNIRP) guidelines. The results showed that under those two frequencies the maximum value of electric field strength in the human brain was 1.52 V/mand it was about 5.4% of the ICNIRP basic restrictions, the maximum SAR in human brain was about 2.21×10−3W/kg, which was far less than 2 W/kg of ICNIRP basic restrictions, the maximum temperature of the human brain was 37.6 located in the wounded skin, which was the same as the normal temperature 37. Since all the results were within the ICNIRP basic restrictions, the electromagnetic exposure generated by the RF cosmetic electrode will not pose a threat to the human health.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 1; 115-127
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Safety evaluation for a high signal operator with electric field exposure induced by contact wires
    Autorzy:
    Yang, Chang-Qiong
    Lu, Mai
    Powiązania:
    https://bibliotekanauki.pl/articles/1841301.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    contact wires
    electric field
    finite element method (FEM)
    high signal operator
    ICNIRP standards
    occupational exposure
    safety evaluation
    Opis:
    To evaluate the occupational safety of a high signal operator exposed to the electric field induced by contact wires with a frequency of 50 Hz and a voltage of 27.5 kV, this study established a model of a high signal operator working in the vicinity of single and double-track railways. The electric field distribution in the operator’s body and his head were calculated and analyzed during the operation using the finite element method (FEM). The calculated results were compared with the international standard occupational exposure limits formulated by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and action levels (ALs), exposure limit values (ELVs) in Directive 2013/35/EU (EU Directive). In the case of a single-track railway exposure, the maximum electric field strength in the worker’s body, in the scalp layer, and inside the brain are 227 mV/m, 2.76 kV/m, and 0.14 mV/m, respectively. For a double-track railway exposure, the maximum internal electric field strength of the operator is 310 mV/m, which is 37.85% of the occupational exposure basic restriction limit. The maximum electric field strength in the head layers is 3.42 kV/m, which is 34.2% of the occupational exposure reference level and 34.2% of the low ALs. The maximum electric field strength of the brain is 0.19 mV/m, which is 0.19% of the occupational basic restriction limit and 0.135% of the sensory effects ELVs. Results show that the electric field exposure of the high signal operator to contact wires in single- and double-track railways is lower than the occupational exposure limits provided by the ICNIRP and EU Directive standards and is thus regarded as safe for workers.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 2; 431-444
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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