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Wyświetlanie 1-15 z 48
Tytuł:
Application of Multiple Input Multiple Output Power Line Communication (MIMO-PLC) to Power Systems
Autorzy:
Recioui, A.
Powiązania:
https://bibliotekanauki.pl/articles/1031663.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
power line communication
data communication
MIMO
power systems
LABVIEW
Opis:
Multiple input multiple output power line communication is presented with its major characteristics and models. Orthogonal frequency division multiplexing modulation scheme applied to power line channel model is presented, also, combination of orthogonal frequency division multiplexing with MIMO Alamouti space time block codes to improve reliability and data rate performance of the system is done. The evaluation of the orthogonal frequency division multiplexing-PLC system over power line communication channel is performed. The comparison between simple PLC and MIMO-PLC systems based upon achieved data rates and reliability in terms of bit error rate is presented.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 496-499
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanisms of Nonuniform Line Broadening
Autorzy:
Wilamowski, Ż.
Przybylińska, H.
Jantsch, W.
Powiązania:
https://bibliotekanauki.pl/articles/1931943.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.20.+q
76.30.-v
Opis:
When the spin relaxation time of paramagnetic impurities at different magnetic sites differs by orders of magnitude then instead of resonance line broadening, rather a decay of the line amplitude is expected. In particular, the sp-d coupling of magnetic impurities to shallow impurities leads to a nonuniform distribution of the longitudinal relaxation rates of local spins.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 181-184
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Aspects of VUV Beam Line Design
Autorzy:
Gaupp, A.
Peatman, W.
Powiązania:
https://bibliotekanauki.pl/articles/1963296.pdf
Data publikacji:
1997-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.15.-i
41.60.Ap
Opis:
Some aspects of the design and usage of vacuum ultra violet beam lines are discussed. Fermat's principle for imaging is introduced and applied to grating monochromators. Some typical vacuum ultraviolet beam lines are presented, and some further topics believed to be of importance today and in the future are mentioned.
Źródło:
Acta Physica Polonica A; 1997, 91, 4; 615-621
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consistency and Symmetry Conditions for Line Projections
Autorzy:
Kontrym-Sznajd, G.
Jura, A.
Powiązania:
https://bibliotekanauki.pl/articles/2008102.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
78.70.Bj
Opis:
We present some relations between experimental spectra representing line projections of electronic densities in the momentum space. All spectra which are the projections of the same density, must be interdependent. It can be derived from the consistency condition and symmetry of the line projections. The knowledge of these dependences, found in the paper, can be utilised for an improvement of experimental data as e.g. two-dimensional angular correlation of positron annihilation spectra.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 586-590
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Construction of Magnetic Dichroism Beam Line in Trieste
Autorzy:
Lama, F.
Powiązania:
https://bibliotekanauki.pl/articles/1963357.pdf
Data publikacji:
1997-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.Yd
42.15.Eq
07.85.Qe
Opis:
The described synchrotron radiation beam line, based on a double mono-chromator with different incidence angles, has been devised to ally in a short length the working possibilities of both vacuum ultraviolet and soft X-ray monochromators as well as to preserve the degree of circular polarization of the radiation emitted by the source. The design philosophy and the predicted performances of the diffraction and the focusing systems are described and the heat load on the beam line optical elements is discussed. Some practical details concerning the beam line, now under construction, are presented.
Źródło:
Acta Physica Polonica A; 1997, 91, 4; 723-729
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regularities of Line Strengths in Spectra of NI, FI, and NeII
Autorzy:
Musielok, J.
Powiązania:
https://bibliotekanauki.pl/articles/1968961.pdf
Data publikacji:
1998-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.30.-r
32.70.Cs
Opis:
Recently experimentally determined individual (fine structure) line strengths for the spectra of NI, FI, and NeII are analysed, searching for regularities resulting from similarities in the structure of these species. Strengths of spectral lines of the prominent 3s-3p and 3p-3d transition arrays are investigated. The absolute scales of these experimentally derived data are based on independently determined lifetimes for excited levels of NI, FI, and NeII. The simple Coulomb approximation method was applied for calculations of the matrix elements for the "jumping" electron in order to obtain an average trend in line strengths of the studied emitters. In the case of the isoelectronic species (FI, NeII), additionally the trend resulting from the perturbation theory is taken for comparison. Except the trend study of the absolute scale, the strengths of individual lines within analogous multiplets (in a relative scale) are investigated and compared with data resulting from LS coupling scheme and with semi-empirical calculations.
Źródło:
Acta Physica Polonica A; 1998, 94, 1; 13-23
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SAW Delay Line for Vibration Sensors
Autorzy:
Filipiak, J.
Solarz, L.
Steczko, G.
Powiązania:
https://bibliotekanauki.pl/articles/1417951.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.25.Fe
77.65.Dq
68.35.Iv
Opis:
The paper presents an analysis of surface acoustic wave delay line. The line consists of two simple interdigital transducers placed on a ST-cut quartz plate. Mid-band operation frequency of the line is 74 MHz. The line will be applied for surface acoustic wave vibration sensor. At the immovable end of the plate there are electric signal feeds to both transducers. This is the cause of increase in signal value going directly between the transducers and the cause of line losses. By means of equivalent electric model of interdigital transducer a loss analysis of the line has been made at 50 Ω load. The analysis allows to minimize line losses by matching the transducers to 50 Ω impedance. This has been practically achieved by a design of transducer geometry and configuration matching 50 Ω impedance, by means of inductance. An analysis of repeated operation characteristics of two interdigital transducers has been made. A signal going directly through capacitance between transducers and signals reflected from the edge of piezoelectric substrate have been presented. Results of theoretical analysis have been compared with experimental examinations.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 808-813
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Complex Permeability Using Short Coaxial Line Reflection Method
Autorzy:
Radonić, V.
Blaž, N.
Živanov, Lj.
Powiązania:
https://bibliotekanauki.pl/articles/1537963.pdf
Data publikacji:
2010-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.-y
07.55.-w
Opis:
This paper describes realization of complex permeability determination for ferrite materials using short coaxial sample holder and vector network analyzer E5071B in frequency range between 300 kHz and 1 GHz. The design of coaxial high frequency sample holder is presented, the principle of measurement and calibration is shown. The extracting of complex permeability from S-parameters is managed based on accomplished formulas, user-friendly program for computer control has been written, and obtained results are explained in detail. In order to verify proposed method, the results of the measurement of NiZn ferrite samples, manufactured by MMG NeoSid, are compared with catalog characteristics.
Źródło:
Acta Physica Polonica A; 2010, 117, 5; 820-824
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Principles Creation Integrated On-Line Access System for Free Standing Renewable Energy Technology (RET)
Autorzy:
Kisseleva, O.
Akhmetov, B.
Kharitonov, P.
Powiązania:
https://bibliotekanauki.pl/articles/1402006.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.70.+C
Opis:
This paper presents the development of the structure of the integrated ON-LINE information system for collective use of renewable energy. Information about each installation including its location identification and capacity which is potentially available for external users is accessible via internet. Structure of each installation will include an intellectual control and registration module (ICRM) for electric energy available to external users. Where necessary any consumer can request reserve energy generated in near-by located free standing istallations for external use and make a decision to approach to any of those installation.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-258-B-259
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collisional Line Shapes in the Presence of Broad-Band Squeezed Vacuum
Autorzy:
Cong, N. H.
Vinh, L. V.
Powiązania:
https://bibliotekanauki.pl/articles/2025783.pdf
Data publikacji:
2001-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Lc
42.50.Ct
Opis:
In this paper we discuss the line shapes of a two-level atom in the presence of broad-band squeezed vacuum and collisional broadening. We describe the collisions and the squeezed vacuum using a stochastic model of Rabi amplitude fluctuations. From such a stochastic description the fast and the slow damping rates of the Bloch polarizations are obtained. The strong field resonance fluorescence spectrum in the presence of stochastic broad-band squeezed vacuum and collisions is derived.
Źródło:
Acta Physica Polonica A; 2001, 99, 5; 545-555
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of two-stage magnetic Barkhausen noise measurement method at power line frequency
Autorzy:
Pal'a, J.
Šoka, M.
Powiązania:
https://bibliotekanauki.pl/articles/1070541.pdf
Data publikacji:
2016-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Rs
75.60.Ej
Opis:
The aim of the paper was to study the features of measurement of the magnetic Barkhausen noise by the new two-stage method in the high excitation frequency region (power line frequency). The magnetic Barkhausen noise was investigated on grain oriented Fe-3%Si steel subjected to different heat treatment. By application of an air coil on the output of the power amplifier we were able to linearize the excitation field. At the same time, the air coil suppressed the unwanted noise from the output of the power amplifier. We have found that the two-stage method is able to reveal a peak of the power spectrum even if it is located at low frequency, in contrast to the classical one-stage method. Further, we successfully applied a model of the power spectrum to the real magnetic Barkhausen noise obtained from the two-stage measurement.
Źródło:
Acta Physica Polonica A; 2016, 129, 3; 383-387
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observation of the Line-Mixing and Collision-Time Asymmetry of the 5$\text{}^{1}$S$\text{}_{0}$-5$\text{}^{3}$P$\text{}_{1}$ Line of the Even-Odd $\text{}^{113}$Cd Isotope
Autorzy:
Bielski, A.
Ciuryło, R.
Domysławska, J.
Lisak, D.
Masłowski, P.
Szudy, J.
Trawiński, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/2037251.pdf
Data publikacji:
2004-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.70.-n
33.70.-w
34.20.-b
Opis:
The profiles of argon perturbed components of the 5$\text{}^{1}$S$\text{}_{0}$-5$\text{}^{3}$P$\text{}_{1}$ line of the even-odd $\text{}^{113}$Cd isotope were measured using a laser-induced fluorescence method. It was shown that the asymmetries of the profiles are due to both the collision-duration and line-mixing effects.
Źródło:
Acta Physica Polonica A; 2004, 105, 4; 329-338
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coherent Population Trapping οn the Second Resonance Line of Potassium
Autorzy:
Gozzini, S.
Cartaleva, S.
Karaulanov, T.
Lucchesini, A.
Slavov, D.
Powiązania:
https://bibliotekanauki.pl/articles/1791197.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
Opis:
We present the observation of coherent population trapping resonances on the second resonance line of potassium: $4s^{2}S_{1//2}$ → $5 p^{2}P_{3//2}$ with wavelength of 404.4 nm. Moreover, a transfer of the coherent population trapping resonance occurs to the excited $4p^{2}P_{1//2}$ and $4p^{2}P_{3//2}$ states of the first resonance line due to cascade transitions. This transfer is evidenced by the observation of narrow resonances at the infrared $4s^{2}S_{1//2}$ → $4p^{2}P_{1//2}$ and $4s^{2}S_{1//2}$ → $4 p^{2}P_{3//2}$ transitions when alkali excitation is performed at the 404.4 nm violet line.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 492-494
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Temperature on Magnetostrictive Delay Line Properties
Autorzy:
Salach, J.
Charubin, T.
Nowak, P.
Jackiewicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/1032231.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.+q
75.50.Kj
81.70.-q
Opis:
This paper presents results of tests performed on magnetostrictive delay line concerning its change in properties during temperature changes. Results indicate that an increase in temperature causes a decrease in wave amplitude and increase in the speed of propagation. The material used for the magnetostrictive delay line was an amorphous steel alloy of Fe-Si-B in tape form.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1183-1185
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lineshape Measurements of Rotational Line in Millimeter-Wave Region by Second Harmonic Detection
Autorzy:
Stanek, J.
Gierszal, S.
Galica, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929813.pdf
Data publikacji:
1993-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Bx
33.70.Jg
Opis:
Lineshape measurements of the J = 6 ← 5 OCS rotational transition were performed using a source-modulation microwave spectrometer. This is a very useful experimental technique but it introduces distortions to the line profile, therefore several authors have theoretically analyzed this problem with the aim of extracting the undistorted parameters of the spectra. The objective of this paper is to verify one of these theories which gives the relationship between harmonic signals and lineshape over wide range of modulation depth. Detailed comparison between the calculated and experimental harmonic signals shows very good agreement, and thus enables us to determine the unmodified line width and finally the pressure broadening factor of the rotational transition J = 6 ← 5 of OCS molecule to be equal to 6.59 ± 0.25 MHz/Tr.
Źródło:
Acta Physica Polonica A; 1993, 84, 6; 1027-1034
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 48

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