Non Linear Oscillator
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Gas de Bose diluido fracamente confinado / Dilute Bose gas weakly confined
A critical study of atomic Bose-Einstein condensates (BECs) is presented. Taking as a starting point the physics of the free gas, we study the effect of weakly confining potentials. Two cases were studied in detail: i) an atomic gas in a finite square well potential with a few bound states; and ii) a system confined in two-dimensions by an isotropic harmonic
Publicado em: 2010
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2. Caracterização espectroscópica e por modelagem mecânico-quântica, de compostos com potencial aplicação em dispositivos ópticos não-lineares
In the present work, the compounds 1-(3,4,5-trimethoxiphenil)-2-(2- tienyl) -5-(4-nitrophenylazo) pirrol (compound 1) and 5-dicianovinyl-5- piperidine-5,2:5:2- tertiophene (compound 2), were characterized using a combination of spectroscopic measurements and quantum mechanical calculation, aiming to evaluate if they present the necessary requisites for appli
Publicado em: 2009
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3. Multicolor Quantum Correlations in the Optical Parametric Oscillator / Correlações quânticas multicolores no oscilador paramétrico ótico
We have investigated the collective quantum properties of the three bright light beams produced by an optical parametric oscillator (OPO) operating above threshold, named pump, signal, and idler. We have analyzed experimentally their intensity and phase quantum fluctuations, and how they are correlated. For the first time, we have observed the existence of p
Publicado em: 2008
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4. Algoritmo híbrido para avaliação da integridade estrutural: uma abordagem heurística / Hybrid algorithm for damage detection: a heuristic approach
In this study, a new auto configured Particle Swarm Optimization - Simplex algorithm for damage detection has been proposed. The formulation of the objective function for the minimization problem is based on the frequency response functions (FRFs) and the modal parameters of the system. A novel strategy for the control of the Particle Swarm Optimization (PSO
Publicado em: 2007
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5. Modelagem ambiental de uma casa de vegetação utilizando rede de osciladores de Van Der Pol. / Greenhouse environmental modeling using Van Der Pol oscillator network.
Agricultural automation is an important area in the development of Brazilian production in recent years. Often, measurement and control of the internal conditions of greenhouses are not easy to implement at a reasonable cost. Researches in this area look for models using computational theory, foreseeing the behavior of internal variables of a greenhouse from
Publicado em: 2007
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6. Hamilton-Jacobi approach for power-law potentials
The classical and relativistic Hamilton-Jacobi approach is applied to the one-dimensional homogeneous potential, V(q) = alphaq n, where alpha and n are continuously varying parameters. In the non-relativistic case, the exact analytical solution is determined in terms of alpha, n and the total energy E. It is also shown that the non-linear equation of motion
Brazilian Journal of Physics. Publicado em: 2006-12
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7. 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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8. Dinamica não linear e interações de defeitos topologicos e solitons na presença de forças externas e impurezas
We study the catastrophes that can occur in kink dynamics in the presence of external forces and impurities. Under the action of some anharmonic forces it can occurs that not only the translational mode is unstable but also the internal modes ( shape modes) or even part of the continuum spectrum ( the soliton is unstable against the interaction with phonons!
Publicado em: 1999
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9. Estudos semiclassicos na representação de estados coerentes
In this work we develop and apply a semiclassical approximation to the coherent-state propagator K(z",z ,t) = (z"iHt/h)z ), where H is the Hamilton operator for the suystem and z) represents the coherent states of the harmonic oscilator. The semiclassical K(z",z ,t) makes use of a stationary phase approxiamtion in which stationary trajectories inhabit is stu
Publicado em: 1997