Singular Systems
Mostrando 13-24 de 53 artigos, teses e dissertações.
-
13. Filtros de Kalman robustos para sistemas dinâmicos singulares em tempo discreto / Robust Kalman filters for discrete-time singular systems
This thesis considers the optimal robust estimates problem for discrete-time singular dymanic systems. New recursive algorithms are developed for the Kalman filtered and predicted estimated recursions with the corresponding Riccati equations. The singular robust Kalman type filter and the corresponding recursive Riccati equation arer obtained in their most g
Publicado em: 2009
-
14. Estrategias de segunda ordem para problemas de complementaridade / Second order strategies for complementarity problems
In this work we reformulate the generalized nonlinear complementarity problem (GNCP) in polyhedral cones as a nonlinear system with nonnegativity in some variables and propose the resolution of such reformulation through interior-point methods. In particular we define two algorithms and prove the local convergence of these algorithms under standard assumptio
Publicado em: 2009
-
15. Chaves MEMS aplicadas a dispositivos de RF e micro-ondas : projeto, tecnologia e implementação fisica de deslocador de fase e filtro sintonizavel / MEMS switches applied to RF and microwave devices : design, technology and physical implementation of phase shifter and tunable filter
O propósito deste trabalho é, a partir dos conceitos de linhas de transmissão, teoria de filtros e o conhecimento pioneiro deste grupo acerca das chaves MEMS de RF, propor duas aplicações reais baseadas nesta estrutura singular: um deslocador de fase e um filtro sintonizável na faixa de 0,1-35GHz e banda Ku (12,4-18GHz) respectivamente. Uma abordagem p
Publicado em: 2009
-
16. A dinÃmica entre famÃlia e organizaÃÃo: representaÃÃes sociais acerca das relaÃÃes de parentesco em uma organizaÃÃo familiar. / The dynamic between family and organization: social representations concerning kinship relations in a family organization.
In the last years, family organizations have been focused by many researchers, due to its social and economic importance worldwide. However, the studies are yet in an embryonic stage, once the theoretical approaches about this object of analysis are fragile and incipient. One of the fundamental aspects, though less explored, for the understanding of these sy
Publicado em: 2009
-
17. Investigando a reestruturação de famílias após o desaparecimento de um filho
The disappearance of a child is a complex phenomenon that affects the family system in various ways, but the sense of loss permeates all of them because, generally, the confirmation of the fact is watered the mystery and lack of family members, since no tend to have the possibility of losing a person in such manner. Thus, the issues involving the loss within
Publicado em: 2009
-
18. Fuller Phenomenon in optimal control problems: minimum time path of autonomous underwater vehicles. / Fenômeno Fuller em problemas de controle ótimo: trajetórias em tempo mínino de veículos autônomos subaquáticos
As equações do modelo bidimensional de veículos autônomos subaquáticos fornecem um exemplo de sistema de controle não linear com o qual podemos ilustrar propriedades da teoria de controle ótimo. Apresentamos, sistematicamente, como os conceitos de formalismo hamiltoniano e teoria de Lie aparecem de forma natural neste contexto. Para tanto, estudamos b
Publicado em: 2008
-
19. Auto-similaridade e unicidade para um sistema semilinear e existÃncia de soluÃÃo com dado singular para a equaÃÃo da onda semilinear
We obtain well-posedeness of small global solutions in Marcinkiewicz spaces L(p1,∞) x L(p2,∞) for semilinear systems. Mild solutions are obtained in this space with the right index to allow the existence of self-similar solutions. Using our estimates of the nonlinear coupling term, we prove the uniqueness of solutions in the class C([0,∞);L
Publicado em: 2008
-
20. Desenvolvimento de análise por trajetórias vibroacústicas para aplicação automotiva
An analysis and development of how vibration and acoustic noise generated in a motor car arrives at the interior of the vehicle, a key issue in modern industry, is presented. The study considers the development of experimental techniques, employing computational data processing and data systemising, leading to the identification and ranking contribution of b
Publicado em: 2008
-
21. Luta pela terra, reforma agrária e territorialização: produção de espaços para trabalho e vida. Itaetê/ Bahia: 1997-2007
This research is delimitated by the social dynamics of the population settled in the municipality of Itaete, in Bahia, and it is centred in their ―territorialization‖ as a process of development. The period 1997 to 2007 is divided in two singular moments, the fight for land and the nesting, which are observed by different social structures: campe
Publicado em: 2008
-
22. Array algorithms for filtering of linear systems / Algoritmos array para filtragem de sistemas lineares
This dissertation develops information filter and array algorithms for linear minimum mean square error estimator (LMMSE) of discrete-time Markovian jump linear systems (MJLSs) and fast array algorithms for filtering of standard singular systems. Numerical examples to show the advantage of the array algorithms are presented. Some results obtained in this res
Publicado em: 2007
-
23. Estudos SERS (Surface-Enhanced Raman Scattering) em meio de Líquido Iônico BMIPF6 usando eletrodo de prata. / Estudos SERS (Surface-Enhanced Raman Scattering) em meio de Líquido Iônico BMIPF6 usando eletrodo de prata.
Room Temperature Ionic Liquids (RTIL) has had increasingly application in different areas of the Chemistry, due to its advantageous physical-chemical properties in relation to other conventional solvents. BMI cation derived RTILs got relevance due its singular physical-chemical properties, like a good electric conductivity and a wide electrochemical window.
Publicado em: 2007
-
24. Local and global symmetries in gauge theories / Simetrias globais e locais em teorias de calibre
This thesis deals with the geometric formulation of classical gauge theories, or Yang-Mills theories, regarded as an important class of models that must be included in any attempt to establish a general mathematical framework for classical field theory. Such a formulation must come in (at least) two variants: the hamiltonian version which has gone through a
Publicado em: 2007