Perturbative Methods
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Locally Perturbative Multiscale Methods for Ionic Solute Transport in Clayly Soils / Modelos Multi-escala Localmente Perturbativos para o Transporte de Solutos Iônicos em Meios Porosos Argilosos
Este trabalho objetiva o desenvolvimento de modelos computacionais capazes de construir simulações numéricas mais realistas e menos custosas computacionalmente para o problema de descontaminação de solos argilosos por técnicas de eletrocinética. Resultados inovadores são obtidos aprimorando-se os modelos multi-escala desenvolvidos anteriormente por L
Publicado em: 2010
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2. 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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3. Analytic QCD: a short review
Analytic versions of QCD are those whose coupling αs(Q²) does not have the unphysical Landau singularities on the space-like axis (-q²= Q² > 0). The coupling is analytic in the entire complex plane except the time-like axis (Q² < 0). Such couplings are thus suitable for application of perturbative methods down to energies of order GeV. We present a shor
Brazilian Journal of Physics. Publicado em: 2008-09
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4. The meson cloud and the strange form factors of the proton / A nuvem mesônica e os fatores de forma estranhos do próton
The goal of this work was to include the scalar $\kappa$ meson on the meson cloud of the proton, and then to verify if the strangeness contribution to the electromagnetic properties of the proton could be explained by the meson cloud model. The observables that quantify such a contribution are the electric ($G_E^s$) and magnetic ($G_M^s$) strange form factor
Publicado em: 2008
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5. 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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6. Dynamical gluon mass in QCD processes
We perform phenomenological applications of modified gluon propagators and running coupling constants in scattering processes in Quantum Chromodynamics (QCD). The modified forms of propagators and running coupling constant are obtained by non-perturbative methods. The processes investigated includes the diffractive ones - proton-proton elastic scattering, li
Brazilian Journal of Physics. Publicado em: 2007-07
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7. 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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8. Probing a color glass condensate in high energy heavy ion collisions
At very high energies, the partons in the nuclear wavefunction form a color glass condensate. Since the occupation number of partons in the color glass condensate is large, classical methods can be used to compute multi-particle production in the initial instants of a high energy heavy ion collision. Non-perturbative expressions are derived relating the dist
Brazilian Journal of Physics. Publicado em: 2003-06
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9. Sensitivity computations using first and second orders perturbative methods for the advection-diffusion-reaction model of pollutant transport
This work aims to apply the disturbance theory to accomplish sensitivity computations in problems of pollutant transported in liquid media modeled through the advection-diffusion-reaction equation. The numerical solution of the differential equation that describes the behavior of the system was found via the SUPG ("Streamline Unwinding Petrov Galerkin") fini
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-03
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10. 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