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    Wyświetlanie 1-7 z 7
    Tytuł:
    Environmental Pollution Monitoring on High-Voltage Insulators
    Monitorowanie zanieczyszczenia środowiska na izolatorach wysokiego napięcia
    Autorzy:
    Briancin, J.
    Dolnik, B.
    Fabian, M.
    Kolcunova, I.
    Kurimsky, J.
    Dzmura, J.
    Cimbala, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/319135.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    izolatory wysokonapięciowe
    zanieczyszczenie środowiska
    prąd upływowy
    przewodnictwo elektryczne
    monitorowanie in-situ
    high-voltage insulators
    environmental pollution
    leakage current
    electrical conductivity
    in-situ monitoring
    Opis:
    This work is focused on environmental pollution monitoring on selected high-voltage insulators. It is well known that environmental pollution on electrical insulation is one of the problems faced by distribution utilities and electricity transmission system. Due to this reason there is a need to deal with monitoring of environmental pollution as it strongly influences their capability to withstand the high-voltage stress without the breakdown. It is the aim of present work to explain influence of morphology and chemical composition of pollutants on the surface resistance and conductivity of selected insulators.
    W artykule przedstawiono wyniki prac dotyczących monitorowania zanieczyszczenia środowiska na wybranych izolatorach wysokonapięciowych. Powszechnie wiadomo, że zanieczyszczenie środowiska oddziałujące na izolację elektryczną jest jednym z problemów, z którymi borykają się przedsiębiorstwa dystrybucyjne i system przesyłu energii elektrycznej. Z tego powodu istnieje potrzeba monitorowania zanieczyszczenia środowiska które silnie wpływa na ich zdolność instalacji do pracy bez awarii. Celem niniejszego artykułu jest wyjaśnienie wpływu morfologii i składu chemicznego zanieczyszczeń na oporność powierzchni i przewodnictwo wybranych izolatorów.
    Źródło:
    Inżynieria Mineralna; 2018, R. 19, nr 1, 1; 111-114
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dielectric Properties of Magnetic Liquids in High Electric Fields
    Autorzy:
    Herchl, F.
    Kopčanský, P.
    Timko, M.
    Koneracká, M.
    Marton, K.
    Kolcunová, I.
    Tomčo, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813918.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    77.22.-d
    Opis:
    In this work, dielectric properties of magnetic fluids composed of magnetite particles dispersed in transformer oil and subjected to a uniform magnetic field were investigated at the high alternating electric field intensities in the range of 0.5-2.5 MV/m. Dielectric stability of the magnetic fluid with the particle volume concentrationΦ= 0.0019 was observed. The magnetic fluid with the concentrationΦ= 0.019 showed the significant changes of permittivity and dielectric losses, too.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 569-572
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Electromagnetic Shield on the High Frequency Electromagnetic Field Penetration through the Building Material
    Autorzy:
    Kolcunová, I.
    Pavlík, M.
    Beňa, L'.
    Čonka, Z.
    Ilenin, S.
    Kanálik, M.
    Kolcun, M.
    Mészáros, A.
    Medveď, D.
    Zbojovský, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032736.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.Gz
    Opis:
    This paper studies how to protect people against electromagnetic radiation inside a building. Widespread usage of the mobile communication led to building of more and more new GSM base-station antennas. These antennas are often placed in the areas with high population density. These antennas emit electromagnetic radiation in standard mobile operator frequencies, i.e. 0.9, 1.8 and 2.1 GHz. Many studies have shown potential biological and thermal effects of GSM electromagnetic fields, therefore people are concerned about their health. Electromagnetic wave does not penetrate the wall of the building as a whole. A small part of the wave is reflected and a small part is absorbed by the building material. In this paper the penetration of electromagnetic waves through the commercially available building materials is measured with specific focus on frequencies of 0.9, 1.8, and 2.1 GHz. Next, the surface of the chosen building material was coated with a magnetic conductive paint in order to improve the shielding effect of the building material. The results of experiment show how the electromagnetic shield reduces the penetration of electromagnetic waves through the building wall.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1135-1137
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Additional Modification of Thermomagnetic Properties of Objects of Low Relative Permeability in Electromagnetic Field
    Autorzy:
    Medveď, D.
    Zbojovský, J.
    Pavlík, M.
    Ilenin, S.
    Čonka, Zs.
    Kanálik, M.
    Kolcunová, I.
    Mészáros, A.
    Beňa, L.
    Kolcun, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032188.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    44.05.+e
    Opis:
    This paper presents the characteristics of the foodstuff heating phenomenon using induction heating process by an induction cooker. The simulation setup was prepared according to the proposed magnetic material and configuration of the pot and induction cooker. The material properties of pot were varied among the several alternatives. The helical coil was designed on the base of the limitation of the induction cooker size and given number of coil turns and coil tube diameter with specific supplied electric current density. The data from the simulation analysis have to determine the enhancing of the highest heat transfer from induction cooker into pot. These data led to the modification of the material and geometrical properties of the pot in accordance to a minimum heating time and enhanced safety operation, especially close to unshielded magnetic objects.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1138-1140
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Shielding Effectiveness of a Magnetic Fluid in Radio Frequency Range
    Autorzy:
    Dolník, B.
    Rajňák, M.
    Cimbala, R.
    Kolcunová, I.
    Kurimský, J.
    Džmura, J.
    Petráš, J.
    Zbojovský, J.
    Kosterec, M.
    Kopčanský, P.
    Timko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030481.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.Jb
    41.20.Gz
    75.50.Mm
    81.70.Ex
    07.50.Hp
    Opis:
    This article builds on the previous work and describes the interaction of transformer oil-based magnetic fluid (MF) with the radio frequency (RF) magnetic near-field. Three prepared samples of the MF used as a barrier to magnetic near-field, consist of transformer oil and dispersed magnetite nanoparticles coated with oleic acid. We pay attention to the important area related to the electromagnetic field shielding by the MF. Such sample of the MF may be a good candidate for applications where it is necessary to simultaneously electrically isolate, remove the excess of heat and to shield electromagnetic interference (EMI). We present a method for the determination of shielding effectiveness (SE) of the MF under RF excitation conditions ranging from 500 MHz to 3 GHz. We report the effect of magnetic volume fraction in the MF and the effect of the sample thickness on the SE.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 585-587
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Response of a Magnetic Fluid to Radio Frequency Electromagnetic Field
    Autorzy:
    Dolník, B.
    Rajňák, M.
    Cimbala, R.
    Kolcunová, I.
    Kurimský, J.
    Balogh, J.
    Džmura, J.
    Petráš, J.
    Kopčanský, P.
    Timko, M.
    Briančin, J.
    Fabián, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032825.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.Jb
    41.20.Gz
    75.50.Mm
    81.70.Ex
    07.50.Hp
    Opis:
    Electromagnetic pollution generated by the electrical devices has been regarded as a new form of pollution, harmful to the society as air and water pollution. The operation of electronic devices in a polluted electromagnetic environment has caused electromagnetic interference to become important concerns. Devices that are vulnerable to interference must often be shielded to protect them from the effects of electromagnetic interference. In this work we describe an interaction of a magnetic fluid based on transformer oil with alternating magnetic field. The magnetic fluid was composed of a transformer oil and dispersed magnetite nanoparticles coated with oleic acid. Among the wide range of topics covered, we pay attention to an important field related to the absorption of electromagnetic field by magnetic fluid as a suitable candidate for applications where it is necessary to electrically isolate, remove excess of heat, and to shield electromagnetic fields. We present a method for the determination of shielding effectiveness of the magnetic fluid under high-frequency excitation conditions from 750 MHz to 3 GHz by means of magnetic near field measurements and analysis. Herein, we report the effect of magnetic volume fraction in the magnetic fluid and the effect of the sample thickness on the shielding effectiveness. We have found that the magnetic fluid has a frequency dependent "windows", characterized that either absorb the magnetic field, or facilitate penetration of the magnetic field through the barrier.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 946-948
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasound Frequency Analysis of a Magnetic Fluid in Low-Intensity External Magnetic Field
    Autorzy:
    Kurimský, J.
    Rajňák, M.
    Cimbala, R.
    Dolník, B.
    Tóthová, J.
    Paulovičová, K.
    Timko, M.
    Kopčanský, P.
    Kolcunová, I.
    Petráš, J.
    Džmura, J.
    Balogh, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032764.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.58.+z
    43.60.+d
    47.65.Cb
    82.70.Dd
    83.80.Hj
    Opis:
    This work deals with an interaction of a magnetic fluid of a dielectric nature with a magnetic field by means of ultrasound waves measurements and analysis. Ultrasound analysis is known as a non-destructive inspection tool often used in technical diagnostics, moreover, it has numerous applications in medicine and biology, too. We report the low-frequency ultrasound analysis of a dielectric magnetic fluid in a low-intensity external static magnetic field. The studied magnetic fluid was composed of a transformer oil and dispersed magnetite nanoparticles coated with oleic acid. Experiments were carried out by using an ultrasonic testing cell. The cell was exposed to a magnetic field of 50 mT in both parallel and perpendicular direction to the waves propagation. A through-transmission mode measurement was applied, where two fixed narrow-band transducers with completely shielded crystal for maximum RFI/EMI immunity (Physical Acoustic R15I-AST, the resonant frequency 150 kHz) served as a transmitter and a receiver. In this way we carried out the measurement of the frequency-dependent ultrasonic response to a rectangle calibrating signal of 5 μs pulse width. Digitized signals were recorded for further analysis. We present the frequency domain analysis of the low-frequency ultrasound in magnetic fluid. The frequency spectrum in magnetic fluid colloidal system was calculated by the Fourier transformation method. Results show that there is a frequency shift in the amplitude-frequency spectrum caused by the step-up magnetic field. The higher the magnetic field, the higher the frequency of the peaks. The effect of particle aggregation in magnetic field on the ultrasound wave propagation is discussed in the paper.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 910-912
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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