Temat: wave packet - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Simulation of Package Waves
Autorzy:: Sadatian, S. Davood
Tematy:: Wave Packet; Synchrotron radiation; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1182890.pdf Link otwiera się w nowym oknie
Opis:: An important application of simulation methods in the fields of Computational Physics, Physical Chemistry and quantum chromodynamics used to perform complex calculations related to the construction of the thermal covering on a spacecraft. In this study, we tried to establish a framework of appropriate software known as Computational Physics Laboratory and simulate a propagation of waves by computer.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Tunnelling effects of a Gaussian wave packet impinging on a barrier
Autorzy:: Papadopoulos, George J.
Tematy:: quantum tunnelling
Gaussiam wave packet
potential barrier
tunelowanie kwantowe
fale Gaussama
potencjalna bariera; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1954608.pdf Link otwiera się w nowym oknie
Opis:: A general procedure based on momentum-like quantity provides the reflection and transmission amplitudes for a given barrier sandwiched by semiconductor reservoirs is presented. Furthermore, the evolution of the wave function stemming from an initial Gaussian wave packet located on the left hand side of the barrier with ignorable barrier overlap is obtained. The evolving wave function enables obtaining the associated probability and current densities space and time-wise. As application, the case of smooth double barrier is considered. The numerical results exhibit similar picture as obtained via propagator in the limited case of square barrier, e.g. repeated current density reversal at the barrier entrance, while being unidirectional at the exit. Presently, the treatment takes account of any barrier, inclusive of applied voltage. The basic quantity required is the value of the momentum-like quantity at the barrier entrance, which is obtained solving a Riccati equation governing the quantity, in question, whose value is known at the barrier exit in terms of the carrier energy and applied bias.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Non-dispersive wave packets in periodically driven quantum systems
Autorzy:: Delande, Dominique
Buchleitner, Andreas
Zakrzewski, Jakub
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 4.

Tytuł:: Algorithm for detection of wave packets in a circular waveguide
Autorzy:: Wrzeciono, Piotr
Szymański, Michał
Bayat, Hydayatullah
Tematy:: wave packet
detection
waveguide
dispersion
speaker
concrete plug
paczki falowe
wykrywanie
falowód
dyspersja
głośnik
korek betonowy; Pokaż więcej
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/58908088.pdf Link otwiera się w nowym oknie
Opis:: This paper presents an algorithm for detecting wave packets in a circular waveguide. The waveguide terminated with a concrete plug was used to test the method. The concrete was made in accordance with the Eurocode standard. During the tests, a significant difference was observed between the behavior of the speaker and the concrete plug. The pulse reflected from the plug maintained its shape regardless of the sound level. The reflection of the pulse from the speaker's diaphragm resulted in a significant change in the form and duration of the wave packet. These changes were dependent on the sound level of the wave packet. As a result of these modifications was a significant difference between the measurement uncertainty of detecting a pulse reflected from the concrete and the speaker. In the case of reflection from the speaker, an uncertainty of 0.036% was obtained. The smallest measurement error value for the pulse reflected from the speaker was 2.5%.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Real time quantum tunneling through a double square barrier
Autorzy:: Papadopoulos, George J.
Tematy:: double square barrier propagator
probability density
current density
wave packet
transmitted probability
propagator z podwójną barierą kwadratową
gęstość prawdopodobieństwa
gęstość prądu
pakiet falowy
prawdopodobieństwo transmisji; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/61030206.pdf Link otwiera się w nowym oknie
Opis:: The propagator of a one-dimensional double square barrier is obtained analytically in terms of the relevant eigenfunctions. With the aid of the propagator the wavefunction evolution for a particle, initially in a state of wave packet, located on the left-hand side of the barrier, with ignorable overlap with the barrier, is obtained. There follows study of the probability and current densities stemming from the particle initial state. In particular, the space distributions at given times of the above densities are given. Furthermore, their evolution in time at the entrance and exit of the barrier is obtained. The numerical results show repeated reversal in the current density at the barrier entrance, while being unidirectional at the exit. However, the probability of entering the barrier over an extremely long time tends to equal the corresponding probability of exiting the barrier. Owing to the fact that the wave packet expands on both of its sides, as time goes by, it is possible to have transmission even if the particle's initial momentum points away from the barrier. The effect, in question, becomes evident in diagrams for the transmitted probability beyond the barrier exit in terms of the particle initial momentum, over a region.
Dostawca treści:: Biblioteka Nauki

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