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Wyświetlanie 1-15 z 27
Tytuł:
Parameterization of the deuteron wave functions and form factors
Autorzy:
V. I. Zhaba, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/1179012.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
deuteron
form factors
parametrization
tensor polarization
wave function
Opis:
Minimization of the number of numerically calculated coefficients for new analytical forms as a product of exponential function r1 by the sum of the exponential terms Ai*exp(-ai*r2) have been done. The optimum is N = 10. Calculations have been done for realistic phenomenological Reid93 potential. Spherical S0 and quadrupole S2 form factors is parameterized by the coefficients for deuteron wave function in coordinate representation. The result t20(p) in wide area of momentas for Reid93 potential agreed well with the literature results for other potential nucleon-nucleon models, and with experimental data’s of world collaborations and reviews. The obtained results will allow studying the deuteron electromagnetic structure, its form-factors, differential cross section of double scattering in more detail in future, and also for calculations the theoretical values of spin observables in dp- scattering.
Źródło:
World Scientific News; 2017, 87; 222-232
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Components for differential cross-section with taking into account the polarization effects in elastic electron-deuteron scattering
Autorzy:
Zhaba, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/1066249.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
cross-section
deuteron
deuteron wave function
electron-deuteron scattering
Opis:
The components for differential cross-section was considered with taking into account the polarization effects in elastic electron-deuteron scattering. These characteristics are analyzed for angle of electron scattering θ = 70º and different momentums. The angular-momentum dependence of values components for differential cross-section have been evaluated in 3D format. The wave function of the deuteron in the coordinate representation for the Reid93 potential was applied to numerical calculations.
Źródło:
World Scientific News; 2019, 131; 279-286
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical forms of deuteron wave function and density distribution
Autorzy:
Zhaba, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/1177883.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
analytic form
approximation
density distribution
deuteron
transition density
wave function
Opis:
Values of density distribution and transition density are calculated using the obtained coefficients of four deuteron wave function for analytical forms in coordinate representation for Argonne v18 potential. Calculations of these values can serve for an assessment of a correctness and accuracy of choice of an analytical form at concrete approximation of radial deuteron wave function. Also these calculations help to evaluate information on such characteristics of a deuteron as a charge form factor, tensor polarization and momentum distribution.
Źródło:
World Scientific News; 2018, 98; 206-213
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The variable phase approach: phase, amplitude and wave functions of the states for np- system for Argonne v18 potential
Autorzy:
Zhaba, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/1070870.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
amplitude function
phase function
phase shifts
single-channel scattering
variable phase approach
wave function
Opis:
Numerical calculations of the values of phase, amplitude and wave functions for the nucleon-nucleon potential Argonne v18 are carried out using the variable phase approach. Peculiarities of the behavior of these functions are described for coordinates up to 7 fm and with energies of interaction Еlab = 1; 50; 100; 150; 250; 350 MeV. 1S0-, 1P1-, 3P0-, 3P1-, 1D2-, 3D2-, 1F3-, 3F3-, 1G4-, 3G4- states for the np- system are considered. The obtained graphic materials for the indicated functions can help to give a better and more complete quantum mechanical representation of the scattering phase and scattering amplitudes for the neuron-proton scattering, as well as better understand and supplement the data for the problem of scalar amplitude and the full cross-section of the nucleon-nucleon scattering.
Źródło:
World Scientific News; 2019, 123; 161-180
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite difference method determination of the nano-hetero-interface wave-function engineering of inter-subband LASER functionality
Autorzy:
Anagnostakis, E. A.
Powiązania:
https://bibliotekanauki.pl/articles/1954084.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
finite difference method
Sturm-Liouville eigensystem
nano-hetero-interface wave-function
Opis:
A novel LASER action nano-hetero-structure of the inter-subband, mid-infrared functionality type is designed on the basis of optically pumped dual resonant tunnelling of conductivity electrons within an appropriately energetically determined scheme of five subbands hosted by two communicating asymmetric, approximately rectangular quantum wells (QWs). The upper LASER action level employed is the second excited subband of the nanostructure's back, wider QW and is provided with electrons via resonant tunnelling from the first excited subband of the nanostructure's front QW populated through remotely ignited optical pumping out of the local fundamental subband. The first excited back QW subband functions as the lower LASER action level, directly delivering the received electrons to the local fundamental subband - via fast vertical longitudinal optical phonon scattering - wherefrom they are being recycled back to the nanostructure's front QW fundamental subband by virtue of a second-reverse sense-resonant tunnelling-mediated normal charge transport mechanism. The handling of the de Broglie wave-function problem evolves into a numerical calculation of a Sturm-Liouville eigensystem solved by means of a finite difference method employing an appropriate tridiagonal coefficient matrix.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 3; 385-392
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical forms of the deuteron wave function in coordinate space and deuteron form factors
Autorzy:
Zhaba, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/1066297.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
deuteron
form factor
polarization observables
position of the zero
wave function
Opis:
Charge GC, quadrupole GQ and magnetic GM deuteron form factor were calculated by analytic forms of the deuteron wave function in the coordinate space for nucleon-nucleon potentials NijmI, NijmII, Nijm93, Reid93 and Argonne v18. Theoretical calculations are compared with the experimental data from the leading collaborations (Bates, BLAST, Bonn, JLab, Mainz, Naval Research Lab, NIKHEF, Orsay, Saclay, SLAC, Stanford, VEPP3, VEPP4) and reviews (Abbott, Boden, Garcon, Karpius). The obtained position of the zero for the deuteron form factors for these five potentials was compared with the values for other potential models and experimental values. Further use of form factors for obtaining polarization observables is discussed.
Źródło:
World Scientific News; 2019, 130; 250-264
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The vector and tensor asymmetries and deuteron wave function for different nucleon-nucleon potentials
Autorzy:
Zhaba, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/1158775.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
deuteron
longitudinal and transverse polarization
radiative corrections
vector and tensor asymmetries
wave function
Opis:
Within the framework of the study of radiative corrections to the polarization observed in elastic ed- scattering in leptonic variables have been calculated the Born values of vector , and tensor , , asymmetries. The deuteron wave functions in coordinate representation for eight nucleon-nucleon potentials (Nijm1, Nijm2, Nijm93, Reid93, Argonne v18, OBEPC, MT and Paris) have been used for numerical calculations of vector and tensor asymmetries. The angular-momentum dependence of values vector and tensor asymmetries have been also evaluated in 3D format for Reid93 potentials.
Źródło:
World Scientific News; 2018, 114; 230-240
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does the quantum mechanical wave function exist?
Autorzy:
Kiefer, Claus
Powiązania:
https://bibliotekanauki.pl/articles/690936.pdf
Data publikacji:
2019
Wydawca:
Copernicus Center Press
Tematy:
wave function
quantum mechanics
ontology
quantum formalism
superposition principle
measurement problem
decoherence
quantum gravity
Opis:
I address the question whether the wave function in quantum theory exists as a real (ontic) quantity or not. For this purpose, I discuss the essentials of the quantum formalism and emphasize the central role of the superposition principle. I then explain the measurement problem and discuss the process of decoherence. Finally, I address the special features that the quantization of gravity brings into the game. From all of this I conclude that the wave function really exists, that is, it is a real (ontic) feature of Nature.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2019, 66; 111-128
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the scattering of electromagnetic waves by bi-isotropic spherical shell
Rozpraszanie fal elektromagnetycznych za pomocą biizotropowej powłoki kulistej
Autorzy:
Shushkevich, G.
Shushkevich, S.
Kuts, A.
Powiązania:
https://bibliotekanauki.pl/articles/194801.pdf
Data publikacji:
2017
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
spherical shell
bi-isotropic spherical shell
electromagnetic wave
wave function
spherical vector
directional diagram of electric field
powłoka kulista
fala elektromagnetyczna
funkcja falowa
wektor kulisty
diagram kierunkowy pola elektrycznego
Opis:
In this article an analytical solution of the problem of scattering of electromagnetic waves on bi-isotropic spherical shell has been presented. Secondary electromagnetic fields are introduced as a superposition of spherical vector wave functions. The solution of the boundary problem is reduced to solving a system of linear algebraic equations for the coefficients which are included in the presentation of the secondary fields. The formula to calculate the directional diagram of electric field in the far field and numerical results for different values of parameters have been obtained. The results may find practical application in the development and design of electromagnetic screens.
W artykule przedstawiono analityczne rozwiązanie problemu rozpraszania fal elektromagnetycznych na biizotropowej powłoce kulistej. Wtórne fale elektromagnetyczne są przedstawiane jako superpozycja funkcji falowych wektora kulistego. Rozwiązanie problemu brzegowego zostało zredukowane do rozwiązania układu liniowych równań algebraicznych dla współczynników, które są zawarte w opisie pól wtórnych. Otrzymano wzór do obliczania diagramu kierunkowego pola elektrycznego w części pola oddalonej na dużą odległość od źródła promieniowania oraz otrzymano wyniki liczbowe dla różnych wartości parametrów. Wyniki mogą znaleźć praktyczne zastosowanie w rozwoju i projektowaniu ekranów elektromagnetycznych.
Źródło:
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2017, z. 89 [295], 1; 111-122
0209-2689
2300-5211
Pojawia się w:
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of Micropolar Fluid in a Porous Medium Provoked by Heat Function and Radiation
Autorzy:
Nwabuzor, P. O.
Ngiangia, A. T.
Chukwuocha, E. O.
Powiązania:
https://bibliotekanauki.pl/articles/1076558.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Electroconductivity
Heat Function
Micropolar Fluid
Rayleigh
Stability
Wave Number
Opis:
The stability of micropolar fluid flow in a channel under the influence of heat function, magnetic field and radiation was investigated. Using the similarity solution and non-dimensionalizing, the governing partial differential equations (PDEs) where transformed to a set of non-linear differential equations (ODEs). We therefore perturbed the system and determined the stability of the system. Wolfram 9 software (Mathematica) was used to analyze the various stability effect of the material parameters on the fluid flow. The graphical results reflects the expected physical behavior of the flow configuration under consideration. The study reveals that the Prandtl (Pr), wave (a), Radiation (R) and heat function parameters at a certain critical value of the wave number hastens the onset of stability. While the Electroconductivity (σ), Magnetic field (M), Micropolar (K) and Microrotational (λ) parameters delays the onset of stability. The result are in agreement with the works of other literature sited.
Źródło:
World Scientific News; 2019, 115; 174-192
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correction of Evanescent Wave Influence on the Flexural Wave Velocity and Wavelength Estimation Based on a Mode Shape Function
Autorzy:
Pantelić, Filip
Šumarac Pavlović, Dragana
Mijić, Miomir
Ridley-Ellis, Daniel
Powiązania:
https://bibliotekanauki.pl/articles/31339954.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
mode shape function
flexural wave velocity
very near field
Opis:
The aim of this research is to use a simple acoustic method of a very near field recording, which enables measurement and display of oscillation modes, to estimate the velocity of flexural waves, based on the wavelengths of standing waves measured on the sample. The paper analyses cases of 1D geometry, flexural waves that occur on a beam excited by an impulse. Measurements were conducted on two different samples: steel and a wooden beam of the same length. Due to the appearance of evanescent waves at the boundary regions, the distance between the nodes of standing waves that occur deviates from half the wavelength, which can be compensated using a correction factor. Cases of fixed and free boundary conditions were analysed. By quantifying how much the boundary conditions change the mode shape function, it can be predicted how the mode of oscillation changes if the boundary conditions change, which can also find application in musical acoustics and sound radiation analysis.
Źródło:
Archives of Acoustics; 2022, 47, 4; 539-546
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fundamental solution to the Cauchy problem for the time-fractional advection-diffusion equation
Autorzy:
Povstenko, Y.
Klekot, J.
Powiązania:
https://bibliotekanauki.pl/articles/122910.pdf
Data publikacji:
2014
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
Cauchy problem
Mittag-Leffler function
time-fractional diffusion-wave equation
Opis:
The one-dimensional time-fractional advection-diffusion equation with the Caputo time derivative is considered. The fundamental solution to the Cauchy problem is obtained using the integral transform technique. The numerical results are illustrated graphically.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2014, 13, 1; 95-102
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lyapunov function based criteria for ship rolling in random beam seas
Autorzy:
Üçer, Erdem
Powiązania:
https://bibliotekanauki.pl/articles/259700.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
random beam sea
wave energy spectrum
Lyapunov function
intact stability criterion
Opis:
The aim of this study is to present a Lyapunov function which can be used to derive an intact stability criterion for a ship in random beam seas. First, the mathematical model of the rolling motion of ships in random beam seas is introduced. The random wave excitation is described by a spectrum which is depended on the wave energy spectrum and the amplitude of the moment of roll. This spectrum is generated by a second order linear filter. Second, the methodology of creating a Lyapunov function is explained briefly. Then, there is outlined the way by which Lyapunov function can be used as the intact stability criterion for a ship. The proposed criterion is derived by considering the weather criteria for German naval vessels. Finally, the coherence of the boundary of safe basin obtained by Lyapunov function with the numerical results obtained by Euler-Maruyama Method is presented. From the results it can be deduced that the Lyapunov function can be used to define an intact stability criterion.
Źródło:
Polish Maritime Research; 2019, 3; 6-14
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fourier transform, oscillatory multipliers and evolution equations in rearrangement invariant function spaces
Autorzy:
Brandolini, Luca
Colzani, Leonardo
Powiązania:
https://bibliotekanauki.pl/articles/966988.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
rearrangement invariant Banach function spaces
Schrödinger and wave equations
Fourier transform
multipliers
Źródło:
Colloquium Mathematicum; 1996, 71, 2; 273-286
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scattering of internal waves by vertical barrier in a channel of stratified fluid
Autorzy:
Dolai, P.
Powiązania:
https://bibliotekanauki.pl/articles/264794.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
stratified fluid
internal wave
vertical barrier
stream function
scattering matrix
Boussinesq approximation
eigen function expansion
rozwarstwienie
hydromechanika
fala wewnętrzna
Opis:
The problem of two dimensional internal wave scattering by a vertical barrier in the form of a submerged plate, or a thin wall with a gap in an exponentially stratified fluid of uniform finite depth bounded by a rigid plane at the top, is considered in this paper. Assuming linear theory and the Boussinesq approximation, the problem is formulated in terms of the stream function. In the regions of the two sides of the vertical barrier, the scattered stream function is represented by appropriate eigen function expansions. By the use of appropriate conditions on the barrier and the gap, a dual series relation involving the unknown elements of the scattering matrix is produced. By defining a function with these unknown elements as its Fourier sine expansion series, it is found that this function satisfies a Carleman type integral equation on the barrier whose solution is immediate. The elements of the scattering matrix are then obtained analytically as well as numerically corresponding to any mode of the incident internal wave train for each barrier configuration. A comparison with earlier results available in the literature shows good agreement. To visualize the effect of the barrier on the fluid motion, the stream lines for an incident internal wave train at the lowest mode are plotted.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 3; 471-485
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 27

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