Browsing by Subject "scattering"

Now showing 1 - 6 of 6

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Analiza metod dekompozycji polarymetrycznych pod kątem ich zastosowania w wybranych zagadnieniach monitoringu środowiska
(Data obrony: 2015-01-07) Górska, Agnieszka
Wydział Geologii, Geofizyki i Ochrony Środowiska
Information about Earth’s surface can be obtain by remote sensing, using either optical instruments or active radar like synthetic aperture radar (SAR). Polarimetric decomposition theorems break polarimetric SAR measurements into components that describes the scattering behavior of the target. This thesis deals with selection polarimetric decomposition methods to identity types of land cover. High resolution images provides by spaceborne instruments is used to determine the amount of single scattering, double-bounce scattering and volume scattering in each pixel in the image. The thesis focuses on two groups of polarimatric decomposition. The first is coherent decomposition which is represented by Pauli and Krogager methods. In the case of incoherent decompositions there are three following methods: Freeman, Yamaguchi and H/A/alpha. The research indicates that none of considered method does not give satisfactory results in the terms of double-bounce scattering, but Yamaguchi method gives the most accurate results through introduction of helix component.
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Budowa systemów kontroli jakości wykonania produktów z wykorzystaniem obrazowania 3D i scatteringu
(Data obrony: 2019-07-25) Kwiek, Paweł Jacek; Lenty, Bartosz
Wydział Inżynierii Mechanicznej i Robotyki
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Budowa systemów kontroli jakości wykonania produktów z wykorzystaniem obrazowania 3D i scatteringu
(Data obrony: 2019-07-25) Lenty, Bartosz; Kwiek, Paweł Jacek
Wydział Inżynierii Mechanicznej i Robotyki
Access status: Open Access ,
Dispersion estimates for spherical Schrödinger equations - the effect of boundary conditions
(2016) Holzleitner, Markus; Kostenko, Aleksej; Teschl, Gerald
We investigate the dependence of the $L^1\to L^{\infty}$ dispersive estimates for one-dimensional radial Schrödinger operators on boundary conditions at $0$. In contrast to the case of additive perturbations, we show that the change of a boundary condition at zero results in the change of the dispersive decay estimates if the angular momentum is positive, $l\in (0,1/2)$. However, for nonpositive angular momenta, $l\in (-1/2,0]$, the standard $O(|t|^{-1/2})$ decay remains true for all self-adjoint realizations.
Access status: Open Access ,
Global well-posedness and scattering for the focusing nonlinear Schrödinger equation in the nonradial case
(2012) Han, Pigong
The energy-critical, focusing nonlinear Schrödinger equation in the nonradial case reads as follows: $i\partial_t u = -\Delta u -|u|^{\frac{4}{N-2}}u,\quad (x,0)=u_0 \in H^1 (\mathbb{R}^N),\quad N\geq 3.$ Under a suitable assumption on the maximal strong solution, using a compactness argument and a virial identity, we establish the global well-posedness and scattering in the nonradial case, which gives a positive answer to one open problem proposed by Kenig and Merle [Invent. Math. 166 (2006), 645-675].
Access status: Open Access ,
Remarks on damped Schrödinger equation of Choquard type
(Wydawnictwa AGH, 2021) Chergui, Lassaad
This paper is devoted to the Schrödinger-Choquard equation with linear damping. Global existence and scattering are proved depending on the size of the damping coefficient.