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Wyszukujesz frazę "radiofrequency" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Mathematical modeling of radiofrequency ablation during open-heart surgery
    Autorzy:
    Stasiuk, Yurii
    Vitaliy, Maksymenko
    Sychyk, Maryna
    Powiązania:
    https://bibliotekanauki.pl/articles/140353.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    arrhythmia
    coagulation
    heart
    modeling
    radiofrequency ablation
    resistive heating
    Opis:
    In this article a three-dimensional mathematical model of radiofrequency ablation during open-heart surgery is presented. It was developed to study temperature field distribution into myocardial tissue. This model uses an anatomically correct 3D model for the left atrium, obtained by magnetic resonance imaging (MRI) processing of a patient; takes into account thermoelectric characteristic differences depending on the area of electric current application; considers cooling by the air flow. An ex-vivo experiment on the pig’s heart was performed where the depth of myocardium tissue damage was measured for the model validation. It was shown that the deviation of the model data from the experiment is within the limits of instrumental measurement error. The developed model is proposed to be used for heart ablation procedures planning, or new equipment development.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 2; 423-431
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Survey of Radio Navigation Systems
    Autorzy:
    Gilski, P.
    Stefański, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/227025.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    radio navigation
    radio communication
    satellite navigation systems
    radiofrequency identification
    Opis:
    At present, there is a growing demand for radio navigation systems, ranging from pedestrian navigation to consumer behavior analysis. These systems have been successfully used in many applications and have become very popular in recent years. In this paper we present a review of selected wireless positioning solutions operating in both indoor and outdoor environments. We describe different positioning techniques, methods, systems, as well as information processing mechanisms.
    Źródło:
    International Journal of Electronics and Telecommunications; 2015, 61, 1; 43-48
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
      Wyświetlanie 1-3 z 3

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