Buscar
Mostrando ítems 1-10 de 6872
Extra Invariance of a Shift-Invariant Space in LCA Groups
(Elsevier, 2010-10)
This article generalizes recent results in the extra invariance for shift-invariant spaces to the context of LCA groups. Let G be a locally compact abelian (LCA) group and K a closed subgroup of G. A closed subspace of ...
Invariance of a Shift-Invariant Space in Several Variables
(Springer, 2011-12)
In this article we study invariance properties of shift-invariant spaces in higher dimensions. We state and prove several necessary and sufficient conditions for a shift-invariant space to be invariant under a given closed ...
Invariance of a shift-invariant space
(Birkhauser Boston Inc, 2010-01)
A shift-invariant space is a space of functions that is invariant under integer translations. Such spaces are often used as models for spaces of signals and images in mathematical and engineering applications. This paper ...
CHANGE LIFE: FROM URBAN REVOLUTION TO SPACE REVOLUTION - HENRI LEFEBVRE PROJECT
(Univ Federal Fluminense, 2018-05-01)
The Henri Lefebvre's theory of the production of space is nowadays one of the main debated contributions in contemporary social theory when the subject is the spatiality of social life. This paper has place in this discussion. ...
Shift-modulation invariant spaces on LCA groups
(Polish Academy of Sciences. Institute of Mathematics, 2012)
A (K,Λ) shift-modulation invariant space is a subspace of L2(G) that is invariant under translations along elements in K and modulations by elements in Λ. Here G is a locally compact abelian group, and K and Λ are closed ...
State space modeling of long-memory processes
(INST MATHEMATICAL STATISTICS, 1998)
This paper develops a state space modeling for long-range dependent data. Although a long-range dependent process has an infinite-dimensional state space representation, it is shown that by using the Kalman filter, the ...
Diagonalization of shift-preserving operators
(Elsevier, 2021-10-08)
In this note we study the structure of shift-preserving operators acting on a finitely generated shift-invariant space. We define a new notion of diagonalization for these operators, which we call s-diagonalization. We ...
Dynamical sampling for shift-preserving operators
(Academic Press Inc Elsevier Science, 2021-03)
In this note, we solve the dynamical sampling problem for a class of shift-preserving operators L:V→V acting on a finitely generated shift-invariant space V. We find conditions on L and a finite set of functions of V so ...
Range-Doppler mapping of space-based targets using the JRO 50 MHz radar
(Springer, 2017-12-02)
The Jicamarca Radio Observatory (JRO) two-dimensional square array radar system operating at ~ 6-m wavelength was used to study the Moon and low Earth orbit satellites using the Range-Doppler inverse synthetic aperture ...