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1
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Optica Applicata
2006 Vol. 36, nr 4 s. 569--574
EN In the spectral range between 480–630 nm the Stark effect of the transitions n1Q–21S, n1Q–21P and n3Q–23P (n = 3–10, Q = S, P, D, ...) was studied in atomic helium using electric field up to 1500 kV/cm. For such an extremely high field the Stark splitting becomes greater than the simple structure of[...]
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Materials Science
EN In this review paper, we present the photoreflectance spectroscopy as a powerful tool for investigations of bulk semiconductors and semiconductor heterostructures. We discuss the application of this spectroscopy technique to investigate various properties of semiconductors, including: the compositio[...]
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International Journal of Applied Mechanics and Engineering
EN The work presents the result of studying the influence of surfactants and solid particles concentration in electrorheological fluid (ERF) on the electrorheological characteristics and on the change in the wetting angle in spreading of a drop placed on a horizontally oriented substrate-electrode. The[...]
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Computer Applications in Electrical Engineering
2012 Vol. 10 107--117
EN 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 Run[...]
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Archives of Electrical Engineering
2016 Vol. 65, nr 2 295--304
EN 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 mag[...]
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Opto - Electronics Review
2017 Vol. 25, No. 4 290--295
EN In this work, an electrically tunable long-period fiber grating (LPFG) coated with liquid crystal layer (LC) is presented. As a LC layer, a prototype low-birefringence 1550A LC mixture was chosen. As a LPFG host, two types of gratings were studied: the LPFGs based on a standard telecommunication fib[...]
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Optica Applicata
EN The room temperature photoreflectance (PR) spectroscopy was used to investigate thick GaN epitaxial layers. The GaN layers were grown by hydride vapour phase epitaxy (HVPE) technique and compared to thin GaN layer grown by metalorganic vapour phase epitaxy (MOVPE) technique on AlN buffer layer. We o[...]
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Prace Naukowe Instytutu Matematyki i Informatyki Politechniki Częstochowskiej
EN The domain of tissue is subjected to the action of electrodes located on the skin surface. External electric field causes the heat generation in tissue domain. The distribution of electric potential in domain considered is described by the Laplace equation, while the temperature field is described b[...]
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Zeszyty Naukowe. Elektryka / Politechnika Opolska
2014 z. 70 101-104
EN This paper presents a review of methods to calculate distribution of the electric field.
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Poznan University of Technology Academic Journals. Electrical Engineering
2012 No. 69 103--109
EN 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 o[...]
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Poznan University of Technology Academic Journals. Electrical Engineering
2012 No. 69 73--80
PL 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 o[...]
EN 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 fr[...]
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Poznan University of Technology Academic Journals. Electrical Engineering
2012 No. 69 81--88
EN 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 [...]
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Mechanics and Mechanical Engineering
2000 Vol. 4, nr 2 251--267
EN The parametric excitation of surface waves on a liquid jet in the presence of an axial periodic electric field is investigated . The method of multiple scales is used to derive and analyze the necessary and sufficient conditions for stability. Owing to the periodicity, resonant cases appear .Two par[...]
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Journal of Theoretical and Applied Mechanics
2012 Vol. 50 nr 1 301-319
PL Autorzy prezentują problem złożonych przestrzenno-czasowych niestabilności elektrycznie indukowanych strumieni wiskotycznych o skończonej przewodności elektrycznej w obecności stałego albo zmiennego pola. Model matematyczny sprowadzono do skomplikowanego równania, w którym niewiadomą jest czasowe i [...]
EN We investigate the problem of combined spatial and temporal instabilities of electrically driven viscous jets with finite electrical conductivity in the presence of either constant or variable applied electric field. A mathematical model leads to a lengthy equation for the unknown spatial growth rat[...]
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Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje
PL Prowadzono badania doświadczalne procesu skraplania par HFC 365 zachodzącego w wnętrzu rury cieplnej pracującej w pozycji pionowej. Do elektrody umieszczonej w osi rury przykładano wysokie napięcie i obserwowano jak pole elektryczne oddziałuje na spływający kondensat. Pod wpływem pola elektrycznego [...]
EN The condensation processes of HFC 365 have been studied experimentally inside a vertical heat pipe. A high voltage was applied to the electrode inside the pipe and the electric field influence on the condensation flow was observed. The heat pipe conductivity has been decreased under electric field e[...]
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Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje
PL Badano doświadczalnie proces parowania HFC 365 w pionowej rurze cieplnej, w obecności pola elektrycznego. Pole elektryczne intensyfikowało wymianę ciepła w parowniku rury cieplnej wypełnionej HFC 365 jako czynnikiem roboczym. Efekt ten występował wyraźnie zarówno dla napięcia stałego jak i zmiennego[...]
EN The evaporation process of HFC 365 inside a vertical heat pipe, in the presence of electric field, has been studied experimentally. Electric field can intensify the heat transfer in a heat pipe's evaporator working with HFC 365. Heat transfer enhancement was observed both for DC and AC field.
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Applied Mechanics and Engineering
EN The paper is an attempt to generalize the results of studies concerned with the "intelligent" fluids. Regularities of variation of mechanical (viscosity, elasticity, plasticity) properties of a class of liquid-disperse suspensions sensitive to an external electric field which are known as electrorhe[...]
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Measurement Automation Monitoring
EN The paper presents the mathematical basis of electromagnetic field modelling over the lossy ground. The model of a cylindrical wave propagating around a lightning return-stroke channel is used for calculations. This paper describes the mathematical basis for modelling the phenomenon of propagation o[...]
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Poznan University of Technology Academic Journals. Electrical Engineering
2013 No. 73 137--145
EN 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 [...]
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Computational Methods in Science and Technology
2017 Vol. 23, No. 4 331--341
EN Throughout this paper we investigate the effect of a vertical alternative current AC and heat transfer on the peristaltic flow of a couple stress dielectric fluid (blood flow model) in a symmetric flexible sinusoidal wavy channel. In order to solve the system of coupled non-linear partial differenti[...]
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