Caustics
Mostrando 1-4 de 4 artigos, teses e dissertações.
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1. Detecção da neoplasia do esôfago em pacientes com estenose por ingestão de agente corrosivo: estudo comparativo entre o emprego da técnica de cromoscopia óptica e o uso de cromoscopia de contraste / Detection of esophagus cancer in patients with caustic lesion/corrosive agent stenosis. A comparative study between narrow band imaging technique and chromoscopy with Lugol solution
Introdução: Narrow-Band Imaging (NBI) é uma das mais recentes técnicas de processamento de imagem, que consiste na utilização de filtros para dissociação das bandas do espectro da luz, resultando em aumento de contraste da superfície epitelial e da vascularização. Em combinação com a magnificação de imagem, pode-se diferenciar os tipos epiteli
Publicado em: 2009
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2. Semiclassical propagation of coherent states / Propagação semiclassica de estados coerentes
This thesis addresses di®erent aspects of the semiclassical propagation of coherent states. We have derived a general expression for the propagator connecting these states which, di®erently from previous formulae in the literature, is valid for packets of arbitrary widths. The result, obtained via functional integration, depends on classical trajectories i
Publicado em: 2005
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3. Colored diffraction catastrophes.
On fine scales, caustics produced with white light show vividly colored diffraction fringes. For caustics described by the elementary catastrophes of singularity theory, the colors are characteristic of the type of singularity. We study the diffraction colors of the fold and cusp catastrophes. The colors can be simulated computationally as the superposition
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4. Topological and percolation properties of potential mapping with glueing
The potential movement of particles forms a continuous mapping of the Lagrangian space on the space of Eulerian coordinates of particles. The force-free inertial movement with random smooth initial velocity field is considered. The condition of particles on caustics glued together to form singularities leads to a peculiar structure with localized regions of