Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Opydo, W." wg kryterium: Autor

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-7 z 7
    Tytuł:
    Electric strength of air and sulphur hexafluoride in the system with electrodes covered with dielectric double layer
    Autorzy:
    Zakrzewski, S.
    Opydo, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/97710.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    electric strength air
    sulphur hexafluoride
    aluminum oxide
    Opis:
    The paper presents the results of the study on the effect of dielectric double layer at electrode surface on electric strength of compressed air and compressed sulphur hexafluoride. The research has been carried out at alternate voltage of 50 Hz frequency. It was found that thin insulation coating laid on electrode surface, composed of aluminum oxide layer with a layer of electro-insulation polyester lacquer significantly improves electric strength of air and sulphur hexafluoride. It was found that maximum growth of electric strength of these gases was caused by the coating under their pressures exceeding the atmospheric one (3·105 and 5·105 Pa). The changes in configuration of electrode surface of the insulation systems caused by sparking over have been examined with scanning laser confocal microscope.
    Źródło:
    Computer Applications in Electrical Engineering; 2012, 10; 394-401
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on development of an electrothermal method of measuring the soil thermal conductivity
    Autorzy:
    Stawicki, J.
    Opydo, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/97718.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    thermal conductivity
    soil thermal conductivity
    Statistica
    Opis:
    The paper presents the studies on development of a simplified electrothermal method of measuring the soil thermal conductivity, that may be used directly in the field. A measurement system has been designed and built, that is connected to measuring sensors located in the examined soil. Two types of sensors, i.e. active and passive ones were used. The passive sensors were provided with thermistors used for temperature measurement, while the active one, apart from the thermistor, was provided with a heating element of resistance type. The study has shown that the proposed method, consisting in measuring the steady heat conduction between the measuring sensor and soil, allows to determine the value of the soil thermal conductivity with satisfying accuracy. Moreover, the method is conducive to significantly smaller disturbance of the soil structure, being a reason of measurement errors occurring while using traditional methods. Mathematical processing of the research results has been carried out with the help of STATISTICA software.
    Źródło:
    Computer Applications in Electrical Engineering; 2012, 10; 118-126
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of microparticles in initiating the electric breakdown in high–voltage vacuum insulation systems
    Autorzy:
    Opydo, W.
    Opydo, D.
    Bieliński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/97674.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    high–voltage vacuum insulation systems
    metallic microparticles
    electric breakdown
    Opis:
    The paper presents the hypotheses of initiating mechanisms of the electric breakdown in vacuum insulation systems caused by small material granules, i.e. the microparticles. The microparticles detached from the parent electrode have an electric charge and move in the inter–electrode area due to the electric field. The role of a microparticle in initiating the breakdown in a vacuum insulation system depends to a considerable extent on the microparticle energy at the moment of its impact against the opposite electrode, i.e. on its velocity at the impact time. The paper presents calculation of the microparticle velocity values at the moment of the impact against the opposite electrode under the conditions existing in practice in the vacuum insulation systems. It was assumed for purposes of the calculation that the microparticles are spherical and made of copper, aluminum or iron, and are subjected to constant electric field. Minimum values of the microparticle velocity necessary to cause plastic deformation of the electrode surface in result of the impact are determined. (The calculations have been carried out with the computer program developed in C# language on the Visual Studio 2013 environment.)
    Źródło:
    Computer Applications in Electrical Engineering; 2016, 14; 177-186
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic emission signals associated with prebreakdown state in air high voltage insulating systems
    Autorzy:
    Dobrzycki, A.
    Opydo, W.
    Zakrzewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/97311.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    high voltage insulating system
    breakdown voltage
    acoustic emission method
    dielectric coatings
    Opis:
    The paper presents the method of acoustic emission (AE) in the study of the state of insulation systems with air as the high-voltage insulation. The tested object was a planar system of electrodes made of aluminum. In addition, the analysis of AE signals and the impact on these signals the presence of dielectric coating on the electrode surfaces of aluminum was tested. We examined the influence of saturation (seal) these coatings on the dielectric strength of the insulation system. The study was conducted at an air pressure values 1·105, 3·105 and 5·105 Pa. The strength of the electrical systems were tested at alternating voltage with a frequency of 50 Hz. Noted pros and cons of using the method of EA in the context of the assessment of high-voltage electric insulation devices. The presented results confirm the possibility of using acoustic emission method, not only for identifying vulnerable areas, but also to predict the time of of further use of high voltage device.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 278-286
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effects of conductivity and pH of saliva on electrochemical potentials of metallic dental materials
    Autorzy:
    Opydo-Szymaczek, J.
    Opydo, J.
    Opydo, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/97371.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    metallic dental materials
    electrochemical potential
    galvanic cells
    oral galvanism
    conductivity
    pH
    Opis:
    The paper presents results of the study on electrochemical potentials of metallic dental materials. Seven alloys, amalgam and chromium-nickel steel were examined as well as the effect of the solution conductivity ranging from 12.5 μS/cm to 2.01 mS/cm and solution pH within the range of 5.5 to 11.2 on electrochemical potentials of the materials. Amalgam presented with the lowest changes of the standard potential due to changing conductivity and pH of the solution within experiment conditions. Moreover, increase of pH value caused decrease of electrochemical potential of all examined materials, apart from amalgam. It was proved that electromotive force of galvanic cells formed by some of the examined materials and amalgam are often higher than 200 mV. Statistica software was used for mathematical analysis of the results.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 143-152
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review and comparison of electro-insulation properties of vacuum and sulphur hexafluoride
    Autorzy:
    Opydo, W.
    Stawicki, J.
    Opydo-Szymaczek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/97567.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    high-voltage insulation
    electric strength
    vacuum
    sulphur hexafluoride
    SF6
    toxic byproducts
    Opis:
    The paper specifies the results of the tests on electric strength of vacuum, sulphur hexafluoride (SF6) and the insulation mineral oil under alternate voltage. The tests have been carried out for planar electrodes made of stainless steel or aluminum. It was found that 10-3 Pa vacuum, 3 105 Pa SF6, and insulation mineral oil situated with equal inter-electrode gap equal to several millimeters, have approximately equal electric strength. The degrees of influence of basic parameters of the insulation system on electric strength of SF6 and vacuum are presented. Advantages and faults of vacuum, SF6, and insulation mineral oil are mentioned, taking into account possible use of these media as a high-voltage insulation in various electric equipment. Mathematical processing of the test results was carried out with the use of the Statistica software [5].
    Źródło:
    Computer Applications in Electrical Engineering; 2013, 11; 222-229
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sulphur hexafluoride as a high-voltage insulation - selected problems
    Autorzy:
    Opydo, W.
    Juszczyk, Z.
    Stawicki, J.
    Opydo-Szymaczek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/97179.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    high-voltage insulation
    electric strength
    sulphur hexafluoride (SF6)
    toxic byproducts
    Opis:
    The paper presents some selected properties of sulphur hexafluoride (SF6) a medium used for high-voltage insulation and electric arc suppression purposes. The results are presented of the studies aimed at determining the effect of the electrode material type, temperature, gas density and interelectrode gap on the SF6 electric strength. The considered systems had both flat electrodes or one flat and the other (cathode) having the form of a rod of 3 mm or 30 mm diameter, ended with a hemisphere. The electrodes have been made of stainless steel or aluminum. The results were mathematically processed with the use of the Statistica [11] computer software. It was found that SF6 temperature changes in the range from 243 K to 293 K with constant SF6 density did not cause variation of electric strength of the gas. Moreover, the effect of the electrode material type on electric strength of SF6 was observed only in the systems distinguished by macroscopic uniformity of the electric field and in case of the gas density exceeding 15 kg/m3, corresponding to SF6 pressure amounting about to 2.5-105 Pa in the temperature 293 K. Physical interpretation of the study results is proposed and formulated. Additionally, the paper discusses the hazards arising from the use of SF6 for the health of the persons operating the equipment and for the environment.
    Źródło:
    Computer Applications in Electrical Engineering; 2014, 12; 206-216
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies