Dissipative Systems
Mostrando 1-12 de 35 artigos, teses e dissertações.
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1. TECHNICAL AND ECONOMIC FEASIBILITY OF USING A VARIABLE-FREQUENCY DRIVE IN MICRO-IRRIGATION SYSTEMS
ABSTRACT Irrigation is essential for the development of crops in regions with scarcity or irregular rainfall distribution, enabling high productivity. However, the use of water resources and electrical energy leads to a concern with irrigation efficiency. Pressure demand varies during the operations of irrigation systems and the appropriate pressure can be r
Eng. Agríc.. Publicado em: 2021-02
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2. Conservação de momento angular em sistemas mecânicos dissipativos / Conservation of angular momentum in dissipative mechanical systems
Objetiva-se discutir e explorar as consequências da conservação do momento angular em situações físicas que apresentem dissipação de energia. Frequentemente, sistemas mecânicos dissipativos são omitidos nas formulações matemáticas da mecânica clássica. No entanto, a conservação da energia mecânica é uma idealização drasticamente incompat
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/02/2012
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3. Morfodinâmica associada entre duna, praia e zona submarina como subsídio a adequada ocupação do espaço costeiro na Praia do Peró - RJ. / Morphodynamics associated between dune, beach and underwater area as an aid to proper occupation of coastal space in Praia do Pero - RJ.
The coastline offers a veritable mosaic of diversity in coastal landforms, which enable the development of a number of different economic activities. Coastal environments are highly dynamic and involve a complex series of continental and oceanic processes. The beach of Pero, located between Cape Buzios and Cabo Frio, Rio coast, appears as an area distinct fr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/03/2011
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4. A review on extension of Lagrangian-Hamiltonian mechanics
This paper presents a brief review on Lagrangian-Hamiltonian Mechanics and deals with the several developments and extensions in this area, which have been based upon the principle of D'Alambert or the other. It is not the intention of the authors to attempt to provide a detailed coverage of all the extensions of Lagrangian-Hamiltonian Mechanics, whereas det
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-03
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5. Pensando em sistemas : abordagens do sistema internacional
O debate acerca do sistema internacional é central à teoria das relações internacionais. Constitui-se também como ponto fundamental ao estabelecimento da própria disciplina de Relações Internacionais em torno de um objeto de estudo consolidado. No entanto, o que se percebe é o desenvolvimento de abordagens concorrentes do termo, de modo que resultam
Publicado em: 2011
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6. Redes de osciladores dissipativos : o modelo duplicado de Caldeira-Leggett, transferência quase-perfeita de estados e recoerência
In this work we treat firstly what we call the double Caldeira-Leggett model, which consists on the approach to the dynamics of two dissipative harmonic oscillators via Feynman-Vernon theory. We derived and solved the associated master equations in two different situations where i) each oscillator is coupled to its own reservoir and ii) both oscillators are
Publicado em: 2010
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7. Estudo das técnicas de obtenção de Hamiltonianos efetivos em Óptica Quântica
In the Quantum Optics area, the construction of effective hamiltonian is a matter of great importance, since from them we can generate and manipulate quantum states and logical operations. In this work we discuss 3 approximate methods for obtaining such effective hamiltonians: i) adiabatic elimination, ii) method of effective dynamics for oscillating hamilto
Publicado em: 2009
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8. 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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9. Comportamento complexo na formação de bolhas de ar em líquidos / Complex behaviour in air-liquid bubble formation
We have investigated the air bubble formation in viscous fluid with some control parameters. We have characterized the sistem using the air flow and the length of the hose that connects the air flow control system and the injector nozzle as control parameters. The hose corresponds to a system dissipative element. We have found period adding routes with and w
Publicado em: 2007
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10. Fases geométricas e invariantes dinâmicos em mecânica quântica
The increasing interest to understand the geometric phases (mainly due to the possi- bility to achieve geometric quantum computation robust against some kind of errors) and the search for new techniques to solve time-dependent problems in Quantum Mechanics, are the topics approached in this thesis. i) Within nowadays technology, it is presented a scheme to c
Publicado em: 2007
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11. Entropy production in nonequilibrium systems described by a Fokker-Planck equation
We study the entropy production in nonequilibrium systems described by a Fokker-Planck equation. We have devised an expression for the entropy flux in the stationary state. We have found that the entropy flux can be written as an ensemble average of an expression containing the force and its derivative. This result is similar to the one used by Lebowitz and
Brazilian Journal of Physics. Publicado em: 2006-12
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12. Dissipação, termalização e descoerencia via acoplamento caotico / Dissipation, thermalization and decoherence through chaotic coupling
We study here how and under which conditions a chaotic system with only two degrees of freedom can produce irreversible phenomena such as dissipation, thermalization and, from the quantum point of view, decoherence in a simple system coupled to it. In the classical formulation of the problem, we describe analytically the behavior of the energy ux in Linear R
Publicado em: 2006