Theory Of Field And Waves
Mostrando 1-12 de 21 artigos, teses e dissertações.
-
1. Do Eclipse Solar de 1919 ao Espetáculo das Lentes Gravitacionais
Resumo Um século depois de observada a deflexão da luz emitida pelas estrelas distantes, durante o eclipse solar de 1919, é interessante saber os conceitos que emergiram do experimento e suas consequências teóricas e observacionais para a cosmologia e astrofísica moderna. Além de confirmar a teoria gravitacional de Einstein, o maior legado foi a const
Rev. Bras. Ensino Fís.. Publicado em: 13/12/2019
-
2. Implementação de um algoritmo numérico para solução da equação de Christoffel generalizada em acustoelasticidade. / Implementation of a numerical algorithm for solution of the generalized Chistoffel equation in acoustoelasticity.
Extensive studies carried out in the last decades on the propagation of ultrasonic waves in solids led to the development of nondestructive techniques for the assessment of the safety and integrity of industrial structures and components. The interest in the application of ultrasound techniques for stress measurement for example comes from the measurable cha
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2012
-
3. Formação de sólitons em condensados de Bose-Einstein e em meios ópticos / Formation of solitons in Bose-Einstein condensates and in photorefractive media
Different kinds of solitons have already been observed in various nonlinear optical media, and their behavior has been explained in the frameworks of such mathematical models as the nonlinear Schrödinger and generalized nonlinear Shrödinger equations for different dimensions and geometries. However, there are situations when many solitons are generated so
Publicado em: 2010
-
4. Quebra da simetria de Lorentz na eletrodinâmica quântica / Lorentz symmetry breaking in quantum electrodynamics
Nesta dissertação, estudamos implicações geradas pela quebra da simetria de Lorentz na Eletrodinâmica Quântica. Analisamos férmions interagindo com um campo eletromagnético nos contextos da mecânica quântica e ao efetuar correções radiativas. Na mecânica quântica, os termos de quebra da simetria de Lorentz foram tratados como perturbações à
Publicado em: 2010
-
5. Lorente symmetry breaking and chern-simons term in (3+1) dimensions / Quebra da simetria de Lorentz e o termo de Chern-Simons em (3+1) dimensões
In this dissertation, we studied the Chern-Simons model in the gauge and the gravitation theories. So, we study the problem of fermions interacting, in a first moment, with a electromagnetic field and in a second moment, with a gravitational field. We introduced in the interaction lagragian, for both cases, a background field which break the Lorentz symmetry
Publicado em: 2009
-
6. Análise técnica: um estudo empírico à luz das finanças comportamentais
This work deepens the discussion in the Technical Analysis field, aligning it premises to the theoretical framework of Behavioral Finance. In this purpose, this paper aimed to make, for the period between the years of 2007 and 2008, an empirical study of the brazilian stock market in the light of Technical Analysis and Behavioral Finance, as well as verifyin
Publicado em: 2009
-
7. Investigation of the theory of coupling compositis in thermal waves fields / Investigação da teoria de acoplamentos de compósitos em campos de ondas térmicas
In this work we elaborate an analytical solution of the temperature field of an opaque material containing two overlapping and parallel subsurface cylinders, illuminated by a modulated light beam. The method is based on the expansion of plane and cylindrical thermal waves, in series of Bessel and Hankel functions. Firstly, the work shows the model of propaga
Publicado em: 2009
-
8. Estudo da desativação do agente VX usando o MgO por cálculos ab initio
The organophosphates are used in industry, in the fields of dyes, varnishes, artificial leather, electrical insulation, waterproofing, plastics, oil additives and solvents, are also used in medicine to treat diseases such as glaucoma, in the household and in agriculture are applied as insecticides and pesticides. Besides these various civilian facilities, th
Publicado em: 2009
-
9. La unificación de luz, electricidad y magnetismo: la "síntesis electromagnética" de Maxwell
In the early nineteenth century, light, electricity and magnetism were considered as three independent phenomena. While interest in optics was justified by its application to the manufacture of optical instruments, electrical and magnetic phenomena could be interesting for scientists but they had no practical applications. In this work, and after a brief des
Revista Brasileira de Ensino de Física. Publicado em: 2008
-
10. MODOS QUASE-NORMAIS E A CORRESPONDÊNCIA ADS/CFT / QUASINORMAL MODES AND THE ADS/CFT CORRESPONDENCE
The electromagnetic and gravitational quasinormal mode spectra of plane-symmetric anti-de Sitter black holes are investigated in the present work. According to the AdS/CFT correspondence, the black hole quasinormal frequencies correspond to the poles of R-current and stress-energy tensor correlation functions in the holographically dual field theory: the N =
Publicado em: 2008
-
11. Seção de choque de absorção de buracos negros de Schwarzschild e de buracos acústicos canônicos / Section of shock of absorption of black holes of Schwarzschild and of canonical acoustic holes
In this dissertation we compute the absorption cross section of Schwarzschild black holes for the massless scalar and electromagnetic fields. We also compute the absorption cross section of canonical acoustic holes for sound waves. We use a numerical method to obtain the results in arbitrary frequencies. We also obtain analytic expressions for the low- and h
Publicado em: 2008
-
12. Microscopic theory of spin waves in magnetic nanowires / Teoria microscÃpica de ondas de spin em nanofios magnÃticos
The dynamical behavior of spins in magnetic materials is affected by its geometry and dimensionality. One can find several new results in the literature exploiting the magnetic properties of low dimension systems with different geometries, since the development of new devices such as: nanosensors, high density magnetic storage, etc., is closely related to ne
Publicado em: 2007