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    Wyświetlanie 1-14 z 14
    Tytuł:
    Near Magnetic Field of a Small Turbojet Engine
    Autorzy:
    Andoga, R.
    Főző, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030273.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.-q
    Opis:
    Different parameters like temperatures, pressures, speed, and vibrations are used in evaluation of technical state of turbojet engines. The article presents a pioneering idea to expand this set of parameters with measurements of distortions in magnetic field in a close vicinity of the engine to obtain more information about its state, which can be further used in its diagnostic and control systems. We believe that deviations in near magnetic field can hold valuable information, which can be used to predict malfunctions and evaluate the condition of the engine. The presented article shows pilot experimental results and gives answer to the basic hypothesis, if such measurements can be realized using a small turbojet engine, as well if there are significant changes in near magnetic field, which would warrant further research in the area.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1117-1119
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimized Frequency Selective Surface for the Design of Magnetic Type Thin Broadband Radio Absorbers
    Autorzy:
    Babayan, V.
    Kazantseva, N.
    Kazantsev, Yu.
    Vilčáková, J.
    Moučka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032283.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.-q
    Opis:
    A novel frequency selective surface for expansion of operating frequency range of magnetic-type radio absorbers was elaborated. Frequency selective surface represents an array of flat electrically conductive elements deposited on the polyethylene terephthalate (PET) foil. The elements have a closed-loop structure on the one side of the foil, and on the opposite side, the conductive elements have the shape of solid fragments which connect projections of the neighboring closed loops. The advantage of such frequency selective surface design is that owing to capacitive shunting one can achieve the value of frequency selective surface quality factor (Q-factor) as low as 0.5. Operating frequency range and thickness of designed radio absorbers depend on the composition of polymer-magnetic material and the position of frequency selective surface therein.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1147-1149
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Excitations in Locally Non-Equilibrium Continuum
    Autorzy:
    Kabychenkov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400140.pdf
    Data publikacji:
    2013-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.-q
    Opis:
    On the basis of locally non-equilibrium thermodynamics the equation for dynamics of the magnetic moment vector is derived. For a magneto disordered continuum the spectrum of locally non-equilibrium fluctuations is determined. It is shown that the spectrum is composed of electromagnetic-spin branches, which contain energy gaps and spin-electromagnetic ones which do not. Unstable modes in diamagnets are found. The dispersion relation and frequency dependence of the damping coefficient are determined for coupled waves of the magnetic vector potential and magnetization. It is shown that there exist frequency regions of transmission and non-transmission. Frequencies of the undamped waves and constant-phase damped waves can be located in these regions.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 4; 695-703
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Dual Reflector Antenna for Point-to-Point System Applications
    Autorzy:
    Olszewska, M.
    Gwarek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505251.pdf
    Data publikacji:
    2011-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.-q
    Opis:
    In this paper design and realization of a dual reflector antenna for receiving internet signal in the point-to-point system is presented. Three different configurations of dual reflector antenna have been considered to obtain the antenna operating in 5.2-5.8 GHz band and having small dimensions. The results of computer simulations and measurements are shown. The design was based on electromagnetic simulations using QW-V2D package (an axisymmetrical version of finite-difference time-domain software). In measurements the method with a reference antenna was used. Additional discussion about using the main reflector of smaller diameter and decreasing spillover radiation was performed.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 4; 558-562
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diffraction by a Half-Plane in a Chiral Medium (Normal Incidence)
    Autorzy:
    Przeździecki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929338.pdf
    Data publikacji:
    1993-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.-q
    42.25.Fx
    Opis:
    An exact, closed form solution is presented for a diffraction problem by a half-plane embedded in a chiral medium. The incidence direction of an electromagnetic plane wave is assumed to be normal to the edge of the half-plane. The problem has been reduced to a boundary value problem for two modal potentials satisfying distinct Helmholtz equations and coupled by the boundary conditions at the half-plane. A solution is constructed with the aid of the Wiener-Hopf technique. A basic feature of the problem is its two-mode character exhibited by: two families of diffracted rays, reflection coupling of the modes, excitation of lateral waves.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 6; 739-750
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Concept of a System for Identification of the Dangerous Areas for People with Visual Dysfunction
    Autorzy:
    Wiciak, J.
    Borkowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504188.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.-q
    46.40.-f
    Opis:
    The article presents the concept of a system for identification of dangerous areas in the urban area targeted at the people with visual dysfunction. The idea of the system is presented comprising the attempt of application of the wireless data transmission: IR - infra-red; BLUETOOTH; RFID. The consideration comprises also the identification of the object (human), identification of the movement direction (double barrier), wireless data transmission with data on the given dangerous area, excitation of the vibration information and the feedback of the system. Also the subject of optimal installation on the urban objects was discussed. The article is a realisation of the research task in the project called "The development of the method for marking of the dangerous areas and especially important places in urban area for visually impaired people with use of the wave-vibration markers".
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6A; 921-924
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sharp-rejection, wide and deep stopband low pass filter design using open stubs and DGS patterns
    Autorzy:
    Challal, M.
    Boulakroune, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1061519.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.-q
    41.20.Jb
    11.10.-z
    Opis:
    A sharp rejection, wide and deep stopband microstrip low pass filter is investigated in this paper. The proposed low pass filter is composed of three defected ground structure patterns and four open stubs. Simulated results verify that the filter has a sharpness factor of 0.9, a low insertion loss of 0.65 and a return loss less than 15 dB. Moreover, a wide stopband at 20 dB rejection ranging from 4.55 GHz to 11.62 GHz is accomplished. The filter presented in this work was compared with the previous works completed on low pass filter with sharp rejection. It has shown that the filter provides good performances in terms of sharp rejection, wide and deep rejection band and small passband insertion loss compared to those reported in the literatures.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 9-10
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variation of magnetic fluid deformation related to nanoparticle concentration in steady electric field
    Autorzy:
    Kosterec, M.
    Kurimský, J.
    Cimbala, R.
    Špes, M.
    Farkaš, R.
    Dolník, B.
    Gamcová, M.
    Rajňák, M.
    Timko, M.
    Kopčanský, P.
    Paulovičová, K.
    Vargová, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1048186.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.65.Cb
    41.20.-q
    47.55.D-
    Opis:
    Today, it is important to know the behaviour of magnetic fluids applied in the power electrical machines, e.g. in power transformers, when exposed to an electric field. Besides their promising applications in high voltage engineering, they are of increasing interest from designed assembly and pattern formation point of view. The structure of such magnetic fluids is easily controllable by external magnetic fields. However, less attention has been paid to structural phenomena in magnetic fluids induced by electric fields. The core of this paper is dedicated to the experimental observation of a magnetic fluid droplet deformation in a steady electric field. The mutual relation between the deformation parameter and magnetic nanoparticles concentration is analysed. Spatio-temporal analysis of the droplet shape is presented in the paper. The phenomena of the droplet deformation were recorded by a camera. The detailed experimental procedure is presented. The method of deformation parameter calculation based on the linear pixel as the smallest-size unit in digital image is written. Finally, the relation between the deformation parameter and the nanoparticle volume concentration, as well as the time and magnitude of the DC field application are thoroughly evaluated. The results show that the deformation parameter decreases with increasing concentration at constant applied steady electric field but increases with increasing applied steady electric field.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 570-573
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Experimental Analysis of Rail Type Electromagnetic Weapons Systems
    Autorzy:
    Kakilli, A.
    Yıldız, İ.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192289.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.20.Dd
    03.50.De
    41.20.-q
    Opis:
    In the study, electromagnetic weapon systems that are developed as an alternative to modern weapon systems are examined and a design for a rail type electromagnetic weapon system is intended. After a literature review on the subject, the comparison of electromagnetic and conventional weapons is made and models of electromagnetic weapons are elaborated. In the study, information of various electromagnetic weapons is provided but the focus is determined to be rail type electromagnetic weapons. Rail type electromagnetic weapons are examined in the study and the design of a low-power weapon prototype is made. For the model developed under laboratory conditions, 8 capacitors are used as a source of ignition. With the rail type electromagnetic weapon system designed, 2613.9 Joule energy is reached. The system components projected in theoretical calculations are enhanced throughout the application phase and are optimized for rail type weapon systems. For making theoretical studies and for drawing the graphs MATLAB software program is utilized. As a consequence, theoretical and empirical data is compared and commented, and some recommendations are formed.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1150-1155
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling the Variable Angle Reflection and Transmission from Metamaterial Slabs
    Autorzy:
    Isić, G.
    Vasić, B.
    Mirić, M.
    Jokanović, B.
    Bergmair, I.
    Gajić, R.
    Hingerl, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795623.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.-q
    42.25.Bs
    42.70.Qs
    Opis:
    We consider metamaterial slabs composed of perfectly conducting split-ring resonators. Assuming bianisotropic constitutive relations, we describe an S-parameter retrieval method that allows us to obtain the full material parameter tensors from numerically calculated S parameters. The retrieval has been done for various angles of incidence, ranging from 0° to 75°. It has been found that the parameters depend on the angle of incidence, but that this dependence is relatively small.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 631-634
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wave Phenomena in High-Voltage Windings of Transformers
    Autorzy:
    Banaszak, S.
    Gawrylczyk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1199077.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.37.+q
    03.50.De
    41.20.-q
    84.40.Az
    Opis:
    Determination of mechanical condition of transformer active part can be performed utilizing frequency response of the windings. Many computing models were developed to evaluate behavior of the winding in wide frequency range using different numerical methods. Most of them utilizes finite elements, assuming axial symmetry, if possible. In other cases we need to use a three-dimensional model, which results in a significant reduction in the accuracy of modeling the geometry of the system, as well as the penetration of electromagnetic field into conductors. From a practical point of view, using computer of average performance, the windings can be modeled with at most 10 turns. From this reason mixed models are proposed, where the electric parameters of the winding are concentrated in the substitute RLC elements. Such models are known as "lumped parameter models". Since the parameters of real winding are distributed, the question arises concerning the necessity of taking into account wave phenomena in them. The method allowing this is known as "transmission line method". Measurements of frequency response are used in industry. There are still many problems with interpretation of test results. Computer modeling may be a helpful tool allowing to understand relation between the geometry of a winding and its frequency response. To fulfill this, models should give similar response as a real measurement. The paper describes a modified transmission line method used for modeling of a transformer winding's frequency response. There is described the model, its parameters, and exemplary solution compared to test data.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1335-1338
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Shifter Operation of the Azimuthally Magnetized Coaxial Ferrite Waveguide
    Autorzy:
    Georgieva-Grosse, M.
    Georgiev, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419702.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.60.Lj
    02.90.+p
    41.20.-q
    41.20.Jb
    85.70.Ge
    Opis:
    The terms for operation of the coaxial waveguide, entirely filled with azimuthally magnetized latching ferrite, as a digital nonreciprocal phase shifter for the normal $TE_{01}$ mode, are found. They are classified as physical, mathematical and functional ones. The physical prerequisites are drawn from the phase curves of the structure and specify the boundaries of the interval in which it produces differential phase shift for a given numerical equivalent of the modulus of off-diagonal ferrite permeability tensor element. The mathematical condition brings the parameters of configuration together with certain roots of its characteristic equation, derived in terms of complex Kummer and Tricomi confluent hypergeometric functions and with the related to them positive real $L_2(c,ρ,n)$ numbers (c=3, 0<ρ<1, n=1). The functional criteria determine the borders of the domain of phase shifter operation of the geometry. These are functions, defined for a fixed central conductor thickness which express in normalized form the impact of the guide radius on the phase shift at the cut-off frequencies and at the envelopes, denoting the termination of the phase curves for negative ferrite magnetization from the side of higher frequencies. The same are reckoned, employing iterative methods, consisting in a repeated numerical solution of the equation mentioned, followed by a computation of the guide radius and phase constant of the wave and are plotted graphically. The influence of the parameters of transmission line on the area referred to is analyzed.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 63-70
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric Field Modelling in Gas-Insulated Substation for Analysis of Conditions for Partial Discharge Phenomena
    Autorzy:
    Florkowska, B.
    Zydroń, P.
    Jackowicz-Korczyński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401877.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    51.50.+v
    52.80.-s
    84.70.+p
    41.20.-q
    Opis:
    The paper refers to diagnostics problems connected with the presence of partial discharges in gas-insulated substation. The basic stimulus for partial discharges generation is local, high value electric field, greater than the inception one. The numerical simulations of the electric field distribution in the part of the gas insulating system and in the vicinity of the metallic protrusion located on high voltage conductor are presented. Such defects are often present in SF₆ insulated constructions and are the cause of a local increase of the electric field. Theoretical analysis of physical mechanism of partial discharges initiation and development in the case of micro-needle type defects is described.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 319-325
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prototype System for Marking and Identification οf Dangerous Spots for Vision Impaired People - Size and Shape Testing Marking the Dangerous Spots Zone
    Autorzy:
    Wiciak, J.
    Borkowski, B.
    Czajka, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490371.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.20.-q
    46.40.-f
    07.55.Db
    07.55.Ge
    Opis:
    The article constitutes the continuation of the works realized under the research project entitled: "The development of the method for marking and identification of the spots dangerous and of special importance for vision impaired persons in the big city with use of the wave-vibration markers". The consideration included the identification of the object (human), identification of the direction of movement (double barrier), wireless data transmission with the information on the dangerous area, stimulation of the vibration signal and the feedback of the system. This article presents the result of choice of the optimal solution regarding the installation of the system on the selected objects of the urban engineering and also presents the concept of the method of modelling of the shape of the zone that is used for marking of the dangerous spot.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1A; A-024-A-027
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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