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Wyświetlanie 1-15 z 143
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:
Prediction of switching impulse breakdown voltage of complex gap based on SVM
Autorzy:
Tang, Zhenpeng
Qin, Yuancheng
Wu, Changsheng
Mai, Ronghuan
Powiązania:
https://bibliotekanauki.pl/articles/2086723.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
complex gap
electric field features
SVM
Opis:
Complex gaps may be formed when carrying out live working in substations, while the discharge characteristics of complex gaps are different from those of single gaps. This paper focuses on the prediction of critical 50% positive switching impulse breakdown voltage (50,crit+) of phase-to-phase complex gaps formed in 220 kV substations. Firstly, several electric field features were defined on the shortest discharge path of the complex gap to reflect the electric field distribution. Then support vector machine (SVM) prediction models were established according to the connection between electric field distribution and breakdown voltage. Finally, the 50,crit+ data of the complex gap were obtained through twice electric field calculations and predictions. The prediction results show that the minimum 50,crit+ of phase-to-phase complex gaps is 1147 kV, and the critical position is 0.9 m away from the high voltage conductor, accounting for 27% of the whole gap. Both critical position and voltage are in good agreement with the values provided in IEC 61472.
Źródło:
Archives of Electrical Engineering; 2022, 71, 2; 507--521
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of estimating the exposure of the natural environment to 50 Hz electric and magnetic fields in power systems with distributed and centralized generations
Autorzy:
Zeńczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/140965.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
distributed generation
electric field
magnetic field
power line
Opis:
The development of a distributed generation will influence the structure of the power transmission and distribution network. Distributed sources have lower power and therefore the lines of lower voltage are used. Therefore, the electric field intensity near such lines is lower. On the other hand magnetic field intensity may prove essential. The main aim of the paper is to present a method estimating the “ballast” of the natural environment at 50 Hz electric and magnetic fields in the power system, with distributed and centralized generation in real operating conditions.
Źródło:
Archives of Electrical Engineering; 2016, 65, 2; 295-304
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using the EMTP/ATP program for calculation of electric and magnetic field distribution under overhead line
Zastosowanie programu EMTP/ATP do obliczania rozkładu pól i elektrycznych i magnetycznych pod linią napowietrzną
Autorzy:
Wiśniewski, J.
Anderson, E.
Karolak, J.
Powiązania:
https://bibliotekanauki.pl/articles/376500.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electric field
magnetic field
overhead line
EMTP-ATP
Opis:
This paper presents the method of calculation of the electric and magnetic fields under overhead transmission line with any number of circuits, phase positions, voltages and current loads. Calculations of this type usually require specialized and costly programs. The program EMTP/ATP is a royalty free tool to calculate the electric transient and steady states in complex power systems. You can use this program and through appropriate modeling the multi-phase wire system representing the line and measurement device calculate the strength of the electric and magnetic fields. The results of calculations are characterized by a very small error compared to the results obtained by using the specialized program. This method can be used with other popular engineering tools like Matlab/Simulink or PSCad.
W artykule przedstawiono metodę obliczeń pól elektrycznych i magnetycznych pod linią wysokiego napięcia o dowolnym układzie faz, liczbie torów, napięciach i obciążeniach. Obliczenia tego typu wymagają zwykle wyspecjalizowanych i kosztownych programów. Program EMTP/ATP jest bezpłatnym narzędziem do obliczania stanów ustalonych i nieustalonych w złożonych układach elektroenergetycznych. Można przy użyciu programu poprzez odpowiednie zamodelowanie układu wieloprzewodowego odwzorować układ pomiarowy pozwalający obliczyć wartość natężenia składowej elektrycznej i magnetycznej pola. Uzyskane wyniki obliczeń charakteryzują się bardzo małym błędem w stosunku do wyników uzyskanych wyspecjalizowanym programem. Metodę tę można stosować przy użyciu także innych szeroko rozpowszechnionych inżynierskich narzędzi jak Matlab/Simulink lub PSCad.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 73-80
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic waves in ceramics with the electroinduced anisotropy
Autorzy:
Khakhomov, S. A.
Barsukov, S. D.
Semchenko, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/385240.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
ultrasound
rotating electric field
interaction
anisotropy
ceramics
Opis:
The effects related with formation of induced anisotropy in natural-isotropic media, have been studied already for a long time. These phenomena interest scientists first of all due to a rare opportunity of control of artificial anisotropy of media, and also due to an opportunity of the energy transfer to a propagating acoustic or an electromagnetic wave. The idea of the nonlinear interaction of an acoustic and rotating electric field for the observation of parametrical electro-acoustic effects in crystals belongs to V.N Belyi and B.B. Sevruk, and has been ascertained more than 20 years ago [1], [2]. Then this idea has being developed by physicists of the Gomel State University [3]-[8] where F.I. Fedorov, B.V. Bokut', and A.N. Serdyukov [9]-[10] created a scientific school in the field of optics and acoustics. Until the present time the opportunity of suppression of absorption of ultrasound by rotating an electric field and amplification of ultrasonic waves in a crystal in conditions of resonant interaction of an electric field with ultrasound [11]-[14] has been predicted. In this case, media with the induced rotating spatially homogeneous acoustic anisotropy represent an acoustic analogue of spatially periodic media, showing the effects characteristic for the last.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 191-201
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The method of location and identification of weak electric field source in seawater
Autorzy:
Jakubiuk, K.
Zimny, P.
Wołoszyn, M.
Powiązania:
https://bibliotekanauki.pl/articles/376626.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electric field
object location
object identification
seawater
Opis:
There are electrochemical processes occurring on a metal object surface in seawater. As the result of these processes, one can observe an electric field in the object vicinity. The paper presents the method and measurement system that allows to locate the detected object and to identify parameters of its simplified model in form of a current dipole. The identify method is based on the matrix norm minimization. The matrix contains results of measurements and parameters of the object in request taken as the current dipole. The results of simulation and experimental detection of sea mines are given. The research results confirmed the effectiveness of the developed method.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 103-109
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power line magnetic field mitigation using a passive loop conductor
Autorzy:
Budnik, K.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/376311.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
magnetic field
electric field
electric power lines
Fourier transform
loop conductor
Opis:
The paper presents in a tutorial manner methods of the calculation of magnetic fields in vicinity of overhead electric power lines without and with passive mitigation loops. Exact and simplified methods of the determination of the magnetic field of a straight overhead conductor based on the Fourier transform technique are presented. The mitigation effects due to the passive loop are also investigated, whereas the mitigation loop can be treated as a rectangular loop (two-conductor closed mitigation loop) horizontal located under the power line. The decomposition of the magnetic fields in two components: magnetic field obtained in free space from the Biot-Savart law and the magnetic field produced by earth current shows that in practical cases the effects from earth currents can be neglected as compared with effects from line currents.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 73; 137-145
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of triboelectric separation of plastic particles in electric field
Autorzy:
Mach, F.
Kůs, P
Karban, P.
Dolezel, I.
Powiązania:
https://bibliotekanauki.pl/articles/97445.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
Runge–Kutta–Fehlberg method
electric field
triboelectric modeling
Opis:
A device for electrostatic separation of triboelectrically charged plastic particles is modelled and optimized. Electric field in the system is solved numerically by a fully adaptive higher-order finite element method. The movement of particles in the device is determined by means of an adaptive Runge-Kutta-Fehlberg method. The shape optimization of the electrodes is carried out using a technique based on higher-order conjugate gradients. The methodology is illustrated by a typical example.
Źródło:
Computer Applications in Electrical Engineering; 2012, 10; 107-117
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infrasound fluctuations during heavy fog event in the Arctic: A case study
Autorzy:
Shumilov, Oleg I.
Kasatkina, Elena A.
Makarov, Dmitry V.
Krapiec, Marek
Powiązania:
https://bibliotekanauki.pl/articles/16538444.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Arctic
Kola
infrasonic waves
atmospheric electric field oscillations
Opis:
Extremely dense fog event was studied on the 3rd December 2001, which occurred in the city of Apatity, the Kola Peninsula, northwestern Russia. Fog had low visibility (30–50 m) and lasted 17 h. Variations of atmospheric pressure and electric field before and during the fog event were measured. Multiple Taper Method (MTM) of spectral analysis has revealed pulsations of the atmospheric electric field in the frequency band of 0.007–0.05 Hz with a power-law turbulence spectrum. MTM and wavelet decomposition analysis results indicate the appearance of two types of atmospheric pressure oscillations under the fog conditions: low-frequency variations with periods of internal gravity waves and a substantial increase in pulsation intensity (more than an order of magnitude) in the high frequency (0.03–0.35 Hz) range. These results may help to improve the understanding of the microphysics of fog formation, development, and dissipation. High-frequency pulsations generation of atmospheric pressure under the fog conditions is also of interest because their period is close to the range of infrasonic oscillations, which can have negative consequences for human health.
Źródło:
Polish Polar Research; 2021, 42, 3; 193-201
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perturbation analysis of electric field around objects in sea water
Autorzy:
Jakubiuk, K.
Zimny, P.
Wołoszyn, M.
Powiązania:
https://bibliotekanauki.pl/articles/377479.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electric field
object in sea water
location methods
electric perturbations
Opis:
In marine environment there are different types of objects, such as ships or naval mines, which should be located and identified. One of the location methods is based on the electric potential distribution measurement [1, 2], The object with an insulating or conductive casing, placed in an electric field, causes some field perturbations. For the purpose of the object location the dimensions of the area, where it is possible to determine electric field perturbations by measurement, are important. In this way one can pre-determine the extent of the system for locating and identifying objects placed in the seawater. This paper presents an analytical approach to the perturbation analysis of electric field distribution caused by a sphere and an ellipsoid placed in a uniform electric field. The distance, beyond which the uniform electric perturbations can be neglected, is determined.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 81-88
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research and Assessment of Safety Distance of TV Electromagnetic Fields
Autorzy:
Baltrenas, P.
Buckus, R.
Powiązania:
https://bibliotekanauki.pl/articles/89688.pdf
Data publikacji:
2011
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
electric field strength
magnetic flux density
electromagnetic field
safety distance
Opis:
The evaluation covers the strengths of electric field and magnetic flux denstiy measured in frequency ranges of 5 Hz–2 kHz and 2–400 kHz of selected TV sets. The dependence of the electromagnetic field on the distance is addressed with reference to ergonomics and safety. Ten TV sets (5 tube and 5 LCD) were measured. There were 16 measurements for each one. The aim was to evaluate electric field and magnetic flux denstiy versus the distance from the tested device with regard to exposure levels. In addition, the distance and the strengths of electric field and magnetic flux denstiy emitted by tube and LCD TVs were compared. The results are presented in charts.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2011, 17, 1; 33-39
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Force and stress calculation in DC dielectrophoresis
Autorzy:
Kurgan, E.
Powiązania:
https://bibliotekanauki.pl/articles/378176.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
dielectrophoresis
DC dielectrophoresis
electric field
force calculation
stress calculation
Opis:
In this paper, two-dimensional direct current (DC) dielectrophoresis is presented. First electric field distribution in particle and surrounding fluid is calculated and next stresses acting from both sides suspension-particle boundary are evaluated. These values are fundamental for force calculation in two-dimensional dielectrophoresis and in simulation of the velocity distribution in interdigitated electrodes.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 111-116
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of polarization molecules reagents of the burning reaction on the efficiency of equipment for thermogeneration
Autorzy:
Kovalyshyn, B.
Powiązania:
https://bibliotekanauki.pl/articles/411199.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
energy efficiency
burning
electric field
high voltage
activation
polarization
Opis:
The aspects of physical and chemical nature of oxidizing-reduction processes of burning were investigated. The communication of efficiency of fuel equipments with polarizing and activating of molecules-reagents was exposed. Application of molecules electro-activation for optimization of the chemical reactions at burning passed at incineration of gaseous hydrocarbon fuels in the oxidizing air environment was grounded experimentally.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2013, 2, 2; 31-35
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green Approach to Intensify the Extraction Processes of Substances from Plant Materials
Autorzy:
Malyushevskaya, Antonina
Koszelnik, Piotr
Yushchishina, Anna
Mitryasova, Olena
Gruca-Rokosz, Renata
Powiązania:
https://bibliotekanauki.pl/articles/2173315.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
green approach
plant material
extraction
polysaccharides
pulsed electric field
Opis:
The principles of sustainable development and green chemistry are priorities in the development of new technologies for the extraction of useful biologically active substances, for example, in the manufacture of medicines. The processes of extracting substances from plant raw materials have many applications. Intensification of such processes, reducing their duration, energy consumption and consumption of the extractant is urgent. The object of the reseach is the green approach to intensify the extraction processes of polysaccharide substances from plant materials. The research methodology was experimental with statistical data processing. In the field of experimental research was the process of the influence of pulsed, alternating and direct current on the intensity of aqueous extraction of polysaccharides from plant materials. The high efficiency of intensification of extraction by a pulsed electric field was studied. The process can reduce the time for obtaining water-soluble polysaccharides by 3 times in comparison with traditional pharmacopoeial convection methods and reduce energy consumption by 20 times. The significance of the pulse current parameters for effective extraction was determined: the referred pulse shape, the frequency of the pulse current for extracting the maximum amount of water-soluble polysaccharides, the pulse duration, and the optimal processing time. The green approach to the use of a moderate electric field of pulsed current to accelerate the extraction of biologically active substances is the basis of the method of intensification of other traditional mass transfer processes for the sustainable development of technology.
Źródło:
Journal of Ecological Engineering; 2022, 23, 7; 197--204
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examination of the Electric Field Intensity Distribution Between Wet Surfaces During Cable Aging Process
Autorzy:
Gunes, I.
Powiązania:
https://bibliotekanauki.pl/articles/1032064.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Cable insulation
electric field
dry band arcing
aging test
Opis:
In this study, electric field effect was investigated by dry band arcing test method. ADSS (all-dielectric self-supporting) cables are usually placed on power grids. These cables are affected by temperature and are exposed to many environmental effects such as wind and UV rays. In this study, the effect of water flow over ADSS cable on electric surface erosion on dry surfaces was investigated by electric arcing method, according to IEEE 1222 standard and the electric field intensity at the surface and the electric potential distribution were analyzed using the finite element method.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 548-550
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 143

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