Waves Mathematics
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. Existence and stability of solutions of type solitary waves in equation Korteweg-de Vries (KdV) / Existência e estabilidade de Soluções do tipo ondas solitárias para a equação Korteweg-de Vries (KdV)
In this paper we demonstrate a theorem of Well-Posedness Local and followed by Well-Posedness Global Equation Korteweg-de Vries in Sobolev spaces by making use of conservation laws of this equation, the properties of the group associated with it, and some estimates obtained by Kenig , Ponce and Vega in [6]. We also demonstrated the existence and stability of
Publicado em: 2009
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2. Optimum filtering to improve the performance of DOA-ML estimators / Filtragem otima para melhorar o desempenho de estimadores DOA-ML
We approached the estimation of direction of arrival (DOA) of plane waves using an array of sensors. In the literature there are several DOA estimators, but we considered only the maximum likelihood (ML) estimators that generate candidates for DOA estimation and select the best one through an ML criterion. We also considered situations where the signal sourc
Publicado em: 2009
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3. Filtragem otima na estimação de direção de chegada de ondas planas usando arranjo de sensores / Optimum filtering on direction of arrival estimation of plane waves using array of sensors
This work deals with the problem of estimating the direction of arrival (DOA) of plane waves using a uniform linear array of sensors. We are concerned with situations where the signal-to-noise ratio is low and the signal sources are spatially close. Our proposal is based on MODE, MODEX and Modified MODEX, that are efficient methods proposed in the literature
Publicado em: 2007
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4. Reaction Mechanisms on the 16,18O + 63,65Cu Systems / Mecanismos de Reação nos Sistemas 16,18O + 63,65Cu
The quasi-elastic excitation functions for the systems 16,18O + 63,65Cu have been measured, at the angle 161º and at energies between 30 and 48MeV, in the laboratory reference system. The quasi-elastic term refers to the sum of the elastic scattering, the inelastic scattering and the transfer reactions. Care has been taken in order to obtain high precision
Publicado em: 2007
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5. Um Novo Método de Geração de Sinais Complexos / A new method for wave form generation
In this work new applications in digital systems, encryption systems, data transmission, etc., through a new mathematical approach are described. This work presents some new important DNAx technique contributions to mathematics, physics and engineering fields. First of all the DNAx equations are defined and applied to definition of Delta of Dirac function, U
Publicado em: 2006