Coherent States
Mostrando 37-48 de 66 artigos, teses e dissertações.
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37. The metaphysical in the gaze, the painting in Merleau-Pontys philosophy / O metafísico no olhar: a pintura na filosofia de Merleau-Ponty
The aim of this study is the research of the problem of painting in the philosophy of Merleau Ponty. Originally enrolled in the frames of an existencialistic philosophy, aferwards it was put with more prominence, in the frame of an ontology.The problem of art, especially of painting, arises as a privileged way of research of our more deaf and secret relation
Publicado em: 2005
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38. Estudo de caso de uma empresa brasileira de grande porte do ramo de alimentos, para analisar sua tendência ao modelo Beyond Budgeting
This study is based on researches developed by Beyond Budgeting Round Table - BBRT, which states budgets rely on proposals anticipating contracts with fixed performances and targets, command and control, and whose benefit is delusive in a centralized management. Therefore, BBRT considers organizations are searching for a new easily elaborated tool able to pr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/03/2004
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39. Systems Biology: an information-theoretic-based thermo-statistical approach
Systems Biology (system-level understanding in biological science), from the physical-chemical point of view, is involved with irreversible thermodynamics and nonlinear kinetic theory of open systems which are founded on nonequilibrium statistical mechanics. We describe a modern thermo-statistical approach for dealing with complex systems, in particular biol
Brazilian Journal of Physics. Publicado em: 2004-06
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40. O grupo unitário simplético: propriedades gerais e estados coerentes / The simplectic unitary group: general properties and choerent states
Neste trabalho fizemos uma revisão geral e encontramos resultados novos sobre a simetria unitária simplética. Obtivemos uma fórmula simples para a exponencial da álgebra de Lie simplética complexa em quatro dimensões, sp(4, C). A partir da decomposição de Gauss do referido grupo, impusemos a unitariedade para obtermos expressões analíticas para es
Publicado em: 2004
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41. Coherent states: the symplectic goup and generalizations / Estados coerentes: o grupo simplético e generalizações.
The subject of the Thesis was the aplication of the coherent states theory to non-trivial quantum systems. Starting from the general definition of coherent states for compact Lie groups, we made a detailed investigation of the construction of these states and its properties in the case of the unitary symplectic group Sp(4), which is extremely important in bo
Publicado em: 2003
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42. Aplicação das funções de quase-probabilidade no estudo da dinamica de emaranhamento
Entanglement dynamics of two ideal bipartites systems is analyzed using reduced linear entropy and quasiprobability distribution functions in the semiclassical regime.Two models are studied: the quartic bidimensional oscillator and the Dicke ?s Maser model. The first one describes the propagation of two monochromatic field modes in a Kerr medium, and the sec
Publicado em: 2003
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43. Transferencia de coerencia atomo-campo em um micromaser de dois fotons
The construction of pure states of the electromagnetic field is important not only for the study of the foundations of the quantum mechanics, such as the question of the Schrõdinger cat states, but also for its potential applications, for example, in quantum computation, quantum criptography and in higher precision measurements. In this thesis, we present t
Publicado em: 2003
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44. Surface instability and dislocation nucleation in strained epitaxial layers
We have studied numerically the stability and defect nucleation in epitaxial layers on a substrate with lattice mismatch. Stress relaxation and energy barriers for misfit dislocation nucleation are estimated using modern methods for saddle point search based on a combination of activation with local repulsive potential and the Nudged Elastic Band method. Str
Brazilian Journal of Physics. Publicado em: 2002-06
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45. "Estados quânticos de um elétron em um campo magnético uniforme" / Quantum States of an Eletcron in a Uniform Magnetic Field
Neste trabalho, apresentamos um método que permite explicitar a arbitrariedade contida nas soluções das equações de onda relativísticas, na presença de certos tipos de campos eletromagnéticos externos. Esta arbitrariedade está relacionada com a existência de uma transformação, com a qual podemos reduzir o número de variáveis presentes na equaç
Publicado em: 2002
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46. Dinamica de sistemas quanticos : atomos em cavidades de ions aprisionados
In this thesis we studied the dynamics of two quantum systems: atoms in a cavity and trapped ions. For atoms in a cavity ( QED ) , we studied the dynamics of field prepared in a superposition of coherent states and a statistical mixture. In this system, using a Intensity-Dependence Jaynes-Cummings model (DNJCM) we discuss some aspects of the dynamics of atom
Publicado em: 2002
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47. Perspectivas de atuação profissional : um estudo de caso das olimpiadas especiais
Special Olympics is one of the sports programs aimed at people with mental disability with focus on the athletes, families and volunteers. The latter include event organization personnel and coaches. In the present study we have attempted to assess the number of physical education professionals involved in the training and coaching of the athletes served by
Publicado em: 2002
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48. Estudo das propriedades da fase do campo eletromagnetico quantizado atraves de estados de fase
Studies on the phase of the quantized electromagnetic field are in general aimed at seeking a proper phase operator. Even though there is no consensus on these operators, states with a well-defined phase do exist, and in our work we show that the field phase can be studied by using these states. After a brief introduction to some of the formalisms that try t
Publicado em: 1999