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Wyszukujesz frazę "high frequency current" wg kryterium: Temat

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Power quality enhancement of three-phase front-end rectifier of UPS system using current injection technique
    Autorzy:
    Dhomane, G. A.
    Suryawanshi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/262756.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    high frequency current injection
    high power factor
    soft transition
    power factor correction circuit
    Opis:
    Power Quality, in terms of power factor and harmonics, is greatly hampered by a three-phase rectifier used as a front-end ac-to-dc converter in many systems including a UPS. This paper presents the high power factor operation of the converter with reduced total harmonic distortion up to 4%. The power quality up gradation is due to high-frequency current injection, at the input of the front-end rectifier. A small filter is required at the output for filtering the high-frequency content. Sinusoidal PWM technique is used for controlling the output voltage. DSP is used for generating the desired gate pulses. The converter has high efficiency, low EMI emissions, high power packing density and suitable for UPS system. A Simulation and experimentation is carried out on a 3 kW converter and experimental results are in good agreement with simulation results.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2008, 14, 2; 35-39
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EM emission of ICs implementated in FPGA : influence of floor plan and electric function
    Autorzy:
    Szczęsny, J.
    Kołodziejski, J. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/378429.pdf
    Data publikacji:
    2007
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Elektronowej
    Tematy:
    FPGA
    emisja elektromagnetyczna
    prąd wysokiej częstotliwości
    Xilinx
    electromagnetic emission
    high frequency current
    near-field disturbances
    Opis:
    In the paper some investigations are presented aiming to check the influence of IC floor plan and the circuit function on its electromagnetic emissions. As the test vehicle Xilinx FPGA XCV800 type was used, in which two types of multiplicators were implemented. To compare the effects, high frequency currents in supply and ground pins of the circuits as well as near field disturbances were measured over the circuits.
    Źródło:
    Electron Technology : Internet Journal; 2007, 39, 4; 1-7
    1897-2381
    Pojawia się w:
    Electron Technology : Internet Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High frequency metrology for intracardiac ablation: in-vivo results
    Autorzy:
    Rouane, A.
    Bru, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221888.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    impedance matching
    voltage measurement cell
    current measurement cell
    high frequency energy
    Opis:
    Cardiac Radiofrequency (RF) ablation is a commonly used clinical procedure for treating many cardiac arrhythmias. However, the efficacy of RF ablation may be limited by two factors: small ventricular lesions and impedance rise, leading to coagulum formation and desiccation of tissue. In this paper, a high frequency (HF) energy ablation system operating at 27.12 MHz based on an automated load matching system was developed. A HF energy matched probe associated to the automated impedance matching device ensures optimal transfer of the energy to the load. The aim of this study was to evaluate this energy for catheter ablation of the atrioventricular junction. In vivo studies were performed using 10 sheep to characterize the lesions created with the impedance matching system. No cardiac perforation was noted. No thrombus was observed at the catheter tip. Acute lesions ranged from 3 to 45 mm in diameter (mean šSD = 10.3š10) and from 1 to 15 mm in depth (6.7š3.9), exhibiting a close relationship between HF delivered power level and lesion size. Catheter ablation using HF current is feasible and appears effective in producing a stable AV block when applied at the AV junction and large myocardial lesions at ventricular sites.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 3; 603-610
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving sensitivity of residual current transformers to high frequency earth fault currents
    Autorzy:
    Czapp, S.
    Dobrzyński, K.
    Klucznik, J.
    Lubosny, Z.
    Kowalak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/141169.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    current transformers
    earth fault currents
    electric devices
    electromagnetic couplings
    high frequency
    Opis:
    For protection against electric shock in low voltage systems residual current devices are commonly used. However, their proper operation can be interfered when high frequency earth fault current occurs. Serious hazard of electrocution exists then. In order to detect such a current, it is necessary to modify parameters of residual current devices, especially the operating point of their current transformer. The authors proposed the modification in the structure of residual current devices. This modification improves sensitivity of residual current devices when high frequency earth fault current occurs. The test of the modified residual current device proved that the authors’ proposition is appropriate.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 3; 485-494
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the influence of power frequency electric field of pantograph on passengers’ health in high-speed EMU
    Autorzy:
    Tian, Rui
    Zhang, Jia-Qi
    Lu, Mai
    Powiązania:
    https://bibliotekanauki.pl/articles/24202736.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    induced current density
    induced electric field intensity
    high-speed EMU
    pantograph
    power frequency electric field
    Opis:
    In this work we discussed the safety of the electric field environment in the No. 3 carriage where the pantograph is located. DSA380 pantograph, CRH5 EMU carriage and passengers’ models were established to study the electric field exposure of passengers at different positions. The results showed that Emax in the carriage without passengers is 1.173 x 10 6 mV/m. Then we set the passengers’ positions according to the electric field distribution in the carriage without passengers and obtained that Emax in the carriage with passengers is 3.195 x 10 6 mV/m. It can be seen that the maximum induced electric field intensity of passengers at different positions appears on the soles of shoes, the maximum value is 3.028 x 105 mV/m, the maximum induced current density occurs at the ankle, its maximum value is 3.476 x 10 -5 A/m 2. It can be concluded that the maximum induced electric field intensity of passenger’s head appears in the cerebrospinal fluid area, with a maximum value of 202.817 mV/m, and the maximum induced electric field intensity of passenger’s head at the door is larger than that in the middle of the carriage. The maximum values of the induced electric field intensity in all tissues of passengers are much smaller than the basic limits of electromagnetic exposure to the public set by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). This study indicated that the pantograph has little influence on the electric field environment in the carriage under working state, and will not cause any health hazard to the passengers in this working frequency electric field environment.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 2; 483--501
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of High Temperature Annealing on Fluorine Distribution Profile and Electro-Physical Properties of Thin Gate Oxide Fluorinated by Silicon Dioxide RIE in CF4 Plasma
    Autorzy:
    Kalisz, M.
    Głuszko, G.
    Beck, R. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/308059.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    capacitance-voltage characteristics
    current-voltage characteristics
    fluorine plasma
    high temperature annealing process
    radio frequency reactive ion etching
    Opis:
    This study describes the effects of high temperature annealing performed on structures fluorinated during initial silicon dioxide reactive ion etching (RIE) process in CF4 plasma prior to the plasma enhanced chemical vapour deposition (PECVD) of the final oxide. The obtained results show that fluorine incorporated at the PECVD oxide/Si interface during RIE is very stable even at high temperatures. Application of fluorination and high temperature annealing during oxide layer fabrication significantly improved the properties of the interface (Ditmb decreased), as well as those of the bulk of the oxide layer (Qeff decreased). The integrity of the oxide (higher Vbd ) and its uniformity (Vbd distribution) are also improved.
    Źródło:
    Journal of Telecommunications and Information Technology; 2010, 1; 25-28
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis of the data on the surface currents and wind parameters generated by numerical models on the Szczecin Lagoon area
    Autorzy:
    Kijewska, M.
    Pleskacz, K.
    Kasyk, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/117323.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Szczecin Lagoon
    surface current
    wind parameters
    hydrodynamic model
    weather forecast
    numerical models
    Geographic Information System (GIS)
    High Frequency Surface Wave Radar (HFSWR)
    Opis:
    This study focuses on the investigation of available surface currents and wind parameters for employing them in order to predict the survivor movement in the Szczecin Lagoon waters. For this purpose, the surface currents and wind parameters were generated by selected numerical models and the wind parameters were also measured with the telemetry devices. In this paper, the PM3D hydrodynamic model and the NEMS, ECMWF, GFS weather forecast models have been investigated. The measurements of the wind parameters, recorded at the Brama Torowa I and Trzebież stations, were also analyzed. As part of the research, an expert method was used to evaluate the surface currents parameters. In turn, the method based on comparing the forecasted wind parameters with the measured wind parameters was applied in order to assess uncertainties of these parameters. The comparative analyses of the data on the surface currents and wind parameters have been done and probabilistic models for uncertainties of these forecasted parameters have been formulated. Additionally, relations between the surface currents speeds and the wind speeds, in the case when their directions were consistent, have been also discovered.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 4; 729-737
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ pól elektromagnetycznych o częstotliwości sieciowej i radiowej na strukturę jądra szczura
    Impact of electromagnetic fields with industrial and radio frequency on structure of rat testis
    Autorzy:
    Sieroń, K.
    Kawczyk-Krupka, A.
    Cieślar, G.
    Sieroń, A.
    Wojnicz, R.
    Cholewka, A.
    Stanek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/261347.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Wydział Podstawowych Problemów Techniki. Katedra Inżynierii Biomedycznej
    Tematy:
    pole elektromagnetyczne
    częstotliwość sieciowa
    częstotliwość radiowa
    system telefonii komórkowej
    linia przesyłowa wysokiego napięcia prądu zmiennego
    jądro
    samce szczurów
    electromagnetic fields
    industrial frequency
    radio frequency
    mobile telephony system
    high voltage alternating current transmission line
    testis
    male rats
    Opis:
    W pracy poddano ocenie na zwierzęcym modelu eksperymentalnym wpływ długotrwałej ekspozycji na oddziaływanie pola elektromagnetycznego o częstotliwości sieciowej, generowanego przez linie przesyłowe prądu zmiennego wysokiego napięcia oraz pola elektromagnetycznego o częstotliwości radiowej, emitowanego przez systemy telefonii komórkowej, a także łącznego ich oddziaływania na strukturę histologiczną jąder dojrzałych samców szczurów, ocenianą w mikroskopie świetlnym. Grupę kontrolną stanowiły zwierzęta poddane ekspozycji pozorowanej. Po 28-dniowej ekspozycji żadna z badanych form pola elektromagnetycznego nie spowodowała zmian struktury histologicznej jąder, widocznej w mikroskopie świetlnym.
    The impact of long-term exposure to the electromagnetic field of industrial frequency generated by high-voltage alternating-current transmission lines and radio-frequency electromagnetic field emitted by mobile telephony system, as well as simultaneous action of both forms of electromagnetic fields on histological structure of adult male rats testes, was studied. As a control group sham-exposed animals were examined. It was stated by means of light microscopic examination that 28-day exposure of animals to examined electromagnetic fields did not cause any changes of histological structure of testes.
    Źródło:
    Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna; 2016, 22, 3; 105-112
    1234-5563
    Pojawia się w:
    Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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