S Formalism
Mostrando 13-24 de 88 artigos, teses e dissertações.
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13. Estudo das propriedades termoelétricas de fios quânticos de telureto de chumbo / Study of thermoelectrical properties in lead telluride quantum wires
This work presents a theoretical study of the electronic and thermoelectric properties of PbTe quantum wires. Thermoelectric effects in nanostructured materials of IV-VI family, in particular superlattices, quantum well and quantum wire, have been studied a lot, because they present an enhancement in figure of merit relatively to bulk. Researching theoretica
Publicado em: 2010
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14. Generalized entropy indices to measure α- and β-diversities of macrophytes
A family of entropy indices constructed in the framework of Tsallis entropy formalism is used to investigate ecological diversity. It represents a new perspective in ecology because a simple equation can incorporate all aspects of α-diversity, from richness to dominance and can be also related to a measure of species rarity. In addition, a generalized Kullb
Brazilian Journal of Physics. Publicado em: 2009-08
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15. q-distributions in complex systems: a brief review
The nonextensive statistical mechanics proposed by Tsallis is today an intense and growing research field. Probability distributions which emerges from the nonextensive formalism(q-distributions) have been applied to an impressive variety of problems. In particular, the role of q-distributions in the interdisciplinary field of complex systems has been expand
Brazilian Journal of Physics. Publicado em: 2009-08
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16. Nonextensivity in a memory network access mechanism
We have previously described neurotic psychopathology and psychoanalytic working-through by an associative memory mechanism, based on a neural network. Memory was initially modelled by a Boltzmann machine (BM). We simulated known microscopic mechanisms that control synaptic properties and showed that the network self-organizes to a hierarchical, clustered st
Brazilian Journal of Physics. Publicado em: 2009-08
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17. Intrinsic asymmetry parameter in nonmesonic hypernuclear decay: analytical proof of the independence on hypernucleus within an independent particle shell model
We derive general analytical expressions for the evaluation of the intrinsic asymmetry parameter in nonmesonic hypernuclear weak decay, within an independent particle shell model framework. Present formalism is valid for even-even, even-odd and odd-odd core hypernucleus. A standard strangeness-changing weak transition potential with exchange of the complete
Brazilian Journal of Physics. Publicado em: 2009-03
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18. Extended Bell´s Be-ables and Atenuattion × Amplification Competition. / Extensão dos Be-ables de Bell e Competição Atenuação x Amplificação
In the first part of this work we employ the Itô stochastic equation to extend Bells be-able interpretation of quantum mechanics to encompass dissipation, decoherence and quantum-to-classical transition through quantum trajectories. For a particular choice of the source of stochasticity, the one leading to a dissipative Lindblad type correction to the Hamil
Publicado em: 2009
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19. Cosmic microwave background polarization / Polarização da radiação cósmica de fundo
Applying concepts of quantum mechanics and kinetic theory we show a re-derivation of Boltzmann equation for the Cosmic Microwave Background (CMB) polarization. We show the equivalence between our derivation and those already known ( [1], [2], [3] ) and also that these derivations correspond to take into account the effect, on the photon polarization, of two
Publicado em: 2009
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20. A STUDY OF CALCULATION METHODOLOGY AND EXPERIMENTAL MEASUREMENTS OF THE KINETIC PARAMETERS FOR SOURCE DRIVEN SYSTEMS / UM ESTUDO SOBRE MÉTODOS DE CÁLCULO E MEDIDAS EXPERIMENTAIS DE PARÂMETROS CINÉTICOS EM SISTEMAS SUBCRÍTICOS ACIONADOS POR FONTE
This work presents a theoretical study of reactor kinetics focusing on the methodology of calculation and the experimental measurements of the so-called kinetic parameters. A comparison between the methodology based on the Dulla´s formalism and the classical method is made. The objective is to exhibit the dependence of the parameters on subcriticality level
Publicado em: 2009
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21. Max Bill : Art of the Intellect and Architecture of Functional Beauty
This Dissertation studies the theory and works of the Swiss artist and architect Max Bill, and more specifically the relationship between his art and architecture. As a student in the Bauhaus from 1927 to 1929 Max Bill studied under the directorship of Walter Gropius and his efforts to unify the arts with a rational orientation and input from sociologists an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2009
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22. Desenvolvimento de metodologias para o estudo do efeito Raman normal e ressonante utilizando modelos Ab initio dependentes do tempo / Development of methodologies for the study of normal and resonance Raman effect using Ab initio time-dependent models
In this work new methodologies for the calculation of absolute vibrational Raman intensities of gaseous systems are presented. In order to reduce the computational requirements in these calculations two families of compact basis functions were generated from the effective core potential valence basis sets SBKJC and Stuttgart-Cologne through the Sadlej s elec
Publicado em: 2009
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23. Paisagismo contemporâneo :estratégias para o projeto de praças. / Contemporary landscape : design strategies for squares.
The landscape today is the greatest area of conceptual and formal trials involving the field of architecture. In the last decades of the twentieth and early twenty-first century, attended to the more radical proposals for landscape design in creating outdoor environments at all scales. These changes aim to create a new nature, closer to humans, more suitable
Publicado em: 2009
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24. O princípio da proporcionalidade, o planejamento tributário e a norma geral antielisiva / The general anti-avoidance provison, tax planing and the principle of proportionality.
The present paper addresses the principle of proportionality, tax planning and the general anti-avoidance provision. Firstly, the historical evolution of legal thinking will be addressed, based on the propositions established in the field of the general interpretation theory, through the theoretical frameworks of the jurisprudence of concepts, the jurisprude
Publicado em: 2009