Perturbative Analysis
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. The use of the perturbative methods for the sensi-tivity analysis in hyperthermic problems caused by the laser sources in the treatment of tumors / Uso de métodos perturbativos para análise de sensibi-lidade em problemas de hipertermia causada por fontes de laser usadas no tratamento de tumores
The hyperthermic procedures available for therapeutic treatments of tumors can cause thermal damage in the adjacent living tissues and it is necessary to have an effective control systems. The temperature distribution inside the tissue must be controlled in order to avoid thermal damages to the healthy tissues in the neighborhood of the tumor. Numeri-cal sim
Publicado em: 2009
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2. AnÃlise de sensibilidade de 2Â ordem numa cÃlula a combustÃvel tipo PEM
No atual estÃgio de desenvolvimento em que a humanidade se encontra, a demanda por energia elÃtrica cresce drasticamente a cada ano. Entretanto, a provÃvel escassez da matriz energÃtica de base fÃssil, associada aos danos ecolÃgicos ocasionados pela sua prospecÃÃo e utilizaÃÃo, tem despertado o interesse por novas formas alternativas e renovÃveis
Publicado em: 2008
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3. O efeito Casimir dinâmico e decoerência
In this thesis we first demonstrate that the inevitable action of the environment can be substantially weakened when considering appropriate nonstationary quantum systems. Beyond protecting quantum states against decoherence, an oscillating frequency can be engineered to make the system-reservoir coupling almost negligible. Differently from the program for e
Publicado em: 2008
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4. Sensitivity analysis of shallow water problems via perturbative methods
We applied the perturbative theory to perform sensitivity analysis of the shallow water equations. The numerical solution of these equations was found via the mass lumping finite element technique. Then, the adjoint system of the shallow water equations was derived for the one-dimensional case and the expression of the sensitivity coefficient of a generic fu
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-09
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5. CONSISTENCY IN THREEDIMENSIONAL PERTURBATIVE CALCULATION ON QUANTUM FIELD THEORY: THE QUANTUM ELETRODYNAMICS / CONSISTÊNCIA NO CÁLCULO PERTURBATIVO TRIDIMENSIONAL EM TEORIA QUÂNTICA DE CAMPOS: A ELETRODINÂMICA QUÂNTICA
In this work we present a detailed study about the three-dimensional quantum electro- dynamics QED3, in perturbative solution at the one loop level. A very general method, concerning the manipulations and calculations involving divergent Feynman integrals, alternative to the traditional regularization techniques, is adopted. The basic physical processes are
Publicado em: 2005
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6. CONSISTÊNCIA NO CÁLCULO PERTURBATIVO: A ELETRODINÂMICA QUÂNTICA E A ANOMALIA AVV / CONSISTENCY IN THE PERTURBATIVE CALCULATION: THE QUANTUM ELETRODYNAMIC AND THE AVV ANOMALY
We use a very general calculational method, concerning the divergences manipulations and calculations, in order to treat the perturbative solution of quantum electrodynamics (QED), at the one loop level, as well as to study the perturbative origin of the axial triangle anomaly related with the electromagnetic decay of the neutral pion. Within the context of
Publicado em: 2004
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7. Transporte quântico em poços parabólicos largos / Transportation wide parabolic quantum wells
The gradual progress, or evolution, of the two-dimensional (2D) toward three-dimensional (3D) Landau states was studied in wide parabolic quantum Wells (W = 1000 6000 Å). As transport technique, we used measurements of the magnetoresistence in intense (B = 0 15 T) and tilted ( = 0 90°; perpendicular parallel) magnetic Field at low temperature (T = 50 Mk).
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/07/2003
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8. Applications of perturbative methods for sensitivity analysis of two phase FLOWs / AplicaÃÃes de mÃtodos perturbativos para anÃlise de sensibilidade em escoamentos bifÃsicos
Escoamentos bifÃsicos sÃo encontrados em processos industriais, naturais ou biolÃgicos. AlÃm de ser importante predizer o comportamento do escoamento atravÃs da soluÃÃo das equaÃÃes que descrevem o fenÃmeno fÃsico, conhecer como os parÃmetros do sistema influenciam no comportamento deste escoamento pode melhorar o conhecimento do mesmo. O conheci
Publicado em: 2003
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9. Estudo da espectroscopia de massas de mesons segundo um modelo de potencial inspirado em cromodinamica quantica
Since the discovery of QCD (Quantum Chromodynamics), there have been remarkable technical achievements in perturbative calculations applied to hadrons. However, it is difficult to use QCD directly to compute hadronic properties. In this context, phenomenological potential models have provided extremely satisfactory results on description of ordinary hadrons,
Publicado em: 2001
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10. Redes de ions de valencia intermediaria
In this work we address the problem of a lattice of Intermediate Valence ions by using a perturbation method especially designed for these systems. We describe the model with atomic transfer operators between fn and fn+1 states of the internal 4f shells of these materiais. The hybridization interaction with the band it taken as the perturbation. In order to
Publicado em: 1989
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11. Mistura de ondas ressonante em absorvedores saturaveis
A study of resonant interactions of two or more waves coupled through population modulation in a saturable absorber (SA) is presented. In the case ot two strong, non collinear waves at equal frequencies, the population in the SA is spatially-modulated and the incident waves are scattered into the various orders of the population grating. A non perturbative r
Publicado em: 1984
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12. Photon Propagation Function: Spectral Analysis of Its Asymptotic Form
The physical attitudes of source theory, displacing those of renormalized, perturbative, operator field theory, are used in a simple discussion of the asymptotic behavior of the photon propagation function. A guiding principle is the elementary consistency requirement that, under circumstances where a physical parameter cannot be accurately measured, no sens