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Wyświetlanie 1-11 z 11
Tytuł:
Polarization properties of Gaussian–Schell model quantization field in a turbulent marine-atmosphere
Autorzy:
Zhao, Y.
Xia, M.
Wang, Q.
Li, Y.
Hu, Z.
Sun, H.
Zhang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/173639.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
polarization fluctuation
Gaussian–Schell model
marine-atmosphere
Kolmogorov turbulence
Opis:
Polarization properties of Gaussian–Schell model quantization field propagating through the Kolmogorov turbulence of a marine-atmosphere channel are studied based on the degree of quantum polarization. The effective photon annihilation and creation operators of Gaussian–Schell model quantization field propagation in a marine-atmosphere are developed by making use of the extended Huygens–Fresnel integral of quantum field. The effects of the outer scale on the degree of polarization can be neglected. As the source transverse coherent width, the number of received photons, the inner scale of turbulent eddies, and the source transverse radius decrease or the re- fractive index structure parameter increases, the degree of polarization decreases. In theory, we find that the polarization fade of marine-atmosphere turbulence channels is larger than that of terrene-atmosphere turbulence channels under same transport parameters and the channel with a stronger turbulence strength will possess a larger detection area of a polarization signal, which have potentially important implications for free-space quantum key distribution.
Źródło:
Optica Applicata; 2016, 46, 3; 335-345
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Far and near fields of Hermite–Gaussian beams passing through an annular aperture and its numerical simulation by the angular spectrum method
Autorzy:
Talatinian, Alexander
Powiązania:
https://bibliotekanauki.pl/articles/27310101.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
angular spectrum
propagation of higher modes
annular aperture
near field
far field
Opis:
This research focuses on the analysis of the free propagation of Hermite–Gaussian beams diffracted by a symmetrical annular aperture placed at the beam waist plane. The propagation is studied analytically and numerically using the angular spectrum method and the 2D fast Fourier transformation. Numerical simulation examples illustrate the propagation characteristics of the Hermite–Gaussian beams diffracted by an annular aperture. The beam truncation parameters and obscuration ratio influence Hermite–Gaussian beam diffraction properties.
Źródło:
Optica Applicata; 2023, 53, 3; 467--481
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analogia w fizyce
Analogy in Physics
Autorzy:
Piersa, Henryk
Powiązania:
https://bibliotekanauki.pl/articles/2012846.pdf
Data publikacji:
2011
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
optyka geometryczna
promień świetlny
współczynnik załamania
geometryczna optyka elektronowa
zasada Fermata
zasada Hamiltona
pierwsze przybliżenie lub optyka Gaussa
drugie przybliżenie
aberracja
pole elektryczne
potencjał elektryczny
potencjał prędkości
elektryczna linia sił
linia prądu
płyn doskonały
ruch w dwu wymiarach
syntaktyka
prawo
geometrical optics
light ray
index of refraction
geometrical optics of electrons
Fermat’s principles
Hamilton’s principles
first-order approximation or Gaussian optics
second-order approximation
aberration
electric field
electric potential
velocity potential
electric line of forces
stream line
perfect liquid
motion in two dimensions
syntactics
law
Opis:
Based upon the example of geometrical optics and  geometrical optics of electrons, as well as the theory of the electric field and the theory of the flow of the perfect liquid in two dimensions, the analogy of the laws of physics have been discussed. In the awareness of physicists, the analogy is a syntactical identity, of the physically interpreted mathematical formulas, describing the laws of physics. In the paper, it has been presented some relevant laws of the two pairs of the theories being compared. For the three cases, it has been provided the appropriate photographs presenting the results of the empirical tests of some of the relevant laws.
Źródło:
Roczniki Filozoficzne; 2011, 59, 2; 239-256
0035-7685
Pojawia się w:
Roczniki Filozoficzne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gaussian Fluctuations of Molecular Field in Quasi-One-Dimensional Ising Model
Autorzy:
Onyszkiewicz, Z.
Wierzbicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/2007877.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Hk
75.70.Ak
Opis:
Quasi-one-dimensional spin systems described by an Ising-like Hamiltonian with a strong space anisotropy (s=1/2) are investigated. Magnetic properties of this model are examined in the approximation including Gaussian fluctuations of molecular field. This paper reports an attempt at obtaining more accurate results for Gaussian fluctuation of molecular field by an exact formula for mean fluctuations of a spin.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 413-421
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Non-Magnetic Substrate on Spatial Distribution of Gaussian Fluctuations of Molecular Field in Magnetic Nanoparticles and Ultrathin Films
Autorzy:
Łosiński, R.
Onyszkiewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2013980.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Hk
75.70.-i
Opis:
An Ising (s=1) model of ferromagnetic nanoparticles and ultrathin films of the sc structure deposited on a non-magnetic substrate is considered. The substrate was assumed to affect the crystal field around the atoms lying closest to it. Consequently, the one-ion anisotropy constant of spin moments of these atoms becomes dependent on the appropriate component of the tensor of the magnetic structure deformation. This dependence was assumed to be linear. To obtain approximations of the Gaussian fluctuations of molecular field, the generalised equilibrium reduced density operator, along with the Feynman diagram technique were used. As a result, temperature dependences of the spatial distributions of mean fluctuations of the magnetic field versus the changes in the one-ion anisotropy constant induced by the non-magnetic substrate were obtained.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 955-958
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The distribution of energy in the Brownian motion in the Gaussian field and analytic-hypoellipticity of certain subelliptic operators on the Heisenberg group
Autorzy:
Hulanicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/1390161.pdf
Data publikacji:
1976
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Studia Mathematica; 1976, 56, 2; 165-173
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generation of realizations of Gaussian random functions on digital computers
Autorzy:
Huk, J.
Powiązania:
https://bibliotekanauki.pl/articles/748609.pdf
Data publikacji:
1977
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
random numbers generator
random field
simulation
Opis:
Artykuł nie zawiera streszczenia
This is an extensive survey of methods for simulation of Gaussian random functions and fields on digital computers. The methods are classified as follows: generation of Gaussian random sequences with a given covariance function and spectral density function of a special type, and by discrete Fourier transform of uniform random numbers; generation of stationary and non-stationary Gaussian processes by filtration; and generation of stationary Gaussian processes, Gaussian fields and vector-valued fields by summing harmonics. (MR0488619)
Źródło:
Mathematica Applicanda; 1977, 5, 9
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron dynamics in a strong laser field with Gaussian Potential well
Autorzy:
Gunatilaka, C. C.
Gamalath, K. A. I. L. Wijewardena
Powiązania:
https://bibliotekanauki.pl/articles/1191504.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Helium-Neon
Ti-Sapphire
time dependant Schrodinger equation
Strong laser field
Gaussian potential well
Argon
Opis:
The time dependant Schrodinger equation was solved for one dimensional and two dimensional Gaussian potential wells in the presence of a strong laser field. Three laser fields Argon, Helium-Neon and Ti-Sapphire with different intensities with cosine and sine laser electric fields were used for the simulation. The Gaussian potential well get distorted in two different ways with the intensity change and the wavelength change of the laser. The wave functions and the position probabilities are presented. The Gaussian potential distortion for He-Ne laser occur in the opposite way compared to Ar and Ti-Sapphire for cosine electric field while Ar laser behaves differently than He-Ne and Ti-Sapphire for sine electric field of the laser in the case of two dimensional potential.
Źródło:
World Scientific News; 2016, 40; 264-283
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the rate of strong mixing in stationary Gaussian random fields
Autorzy:
Cheng, Raymond
Powiązania:
https://bibliotekanauki.pl/articles/1293383.pdf
Data publikacji:
1992
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
stationary random field
strong mixing
prediction theory
Opis:
Rosenblatt showed that a stationary Gaussian random field is strongly mixing if it has a positive, continuous spectral density. In this article, spectral criteria are given for the rate of strong mixing in such a field.
Źródło:
Studia Mathematica; 1991-1992, 101, 2; 183-191
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial Dependence of Magnetization and Gaussian Fluctuations of Molecular Field in an Ising Nanopyramid Interacting with the Substrate
Autorzy:
Borkowski, L.
Jacyna-Onyszkiewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1810597.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.+a
Opis:
We study thermodynamic properties of an Ising model of a ferromagnetic nanoscopic pyramid deposited on a ferromagnetic bulk substrate. The influence of the interaction between the pyramid and the substrate is calculated in terms of the reduced-state (density) operator used for description of thermodynamic properties of nanoscopic systems. The spatial distribution of magnetization in the nanopyramid is obtained in the Gaussian fluctuations approximation.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 375-377
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finitely additive functions in measure theory and applications
Autorzy:
Alpay, Daniel
Jorgensen, Palle
Powiązania:
https://bibliotekanauki.pl/articles/29519748.pdf
Data publikacji:
2024
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Hilbert space
reproducing kernel
probability space
Gaussian field
transforms
covariance
Itô integration
Itô calculus
generalized Brownian motion
Opis:
In this paper, we consider, and make precise, a certain extension of the Radon–Nikodym derivative operator, to functions which are additive, but not necessarily sigma-additive, on a subset of a given sigma-algebra. We give applications to probability theory; in particular, to the study of μ-Brownian motion, to stochastic calculus via generalized Itô-integrals, and their adjoints (in the form of generalized stochastic derivatives), to systems of transition probability operators indexed by families of measures μ, and to adjoints of composition operators.
Źródło:
Opuscula Mathematica; 2024, 44, 3; 323-339
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-11 z 11

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