منابع مشابه
Huygens–Fresnel diffraction and evanescent waves
Article history: Received 13 December 2009 Received in revised form 26 July 2010 Accepted 1 October 2010 Based on a modified Huygens–Fresnel principle valid in the near field, we analytically verify the exponential wave decay of evanescent waves. This field decay along the propagation direction can be considered as the result of interference between elementary oscillating dipole sources rather ...
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The Huygens-Fresnel diffraction integral has been formulated for incident spherical waves with use of the Kirchhoff obliquity factor and the wave front as the surface of integration instead of the aperture plane. Accurate numerical integration calculations were used to investigate very-near-field (a few aperture diameters or less) diffraction for the well-established case of a circular aperture...
متن کاملVariations sur un THème de Aldama et Shelah
We study the definability of certain subgroups of a group G that does not have the independence property. If a (type) definable subset X of an elementary extension G of G has property P , we call its trace X∩G over G an externally (type) definable P set. We show the following. Centralisers of subsets of G are externally definable subgroups. Cores of externally definable subgroups and iterated c...
متن کاملWave-front engineering by Huygens-Fresnel principle for nonlinear optical interactions in domain engineered structures.
Wave-front engineering for nonlinear optical interactions was discussed. Using Huygens-Fresnel principle we developed a general theory and technique for domain engineering with conventional quasi-phase-matching (QPM) structures being the special cases. We put forward the concept of local QPM, which suggests that the QPM is fulfilled only locally not globally. Experiments agreed well with the th...
متن کاملSélection de la structure d'un perceptron multicouches pour la réduction dun modèle de simulation d'une scierie
Résumé— La simulation est souvent utilisée pour évaluer la pertinence d’un Programme Directeur de Production (PDP) ou pour en évaluer l’impact sur des scénarii d’ordonnancement détaillés de la fabrication. Dans ce cadre, nous nous proposons de réduire la complexité d’un modèle de simulation en exploitant un perceptron multicouches. Une phase primordiale lors de la modélisation d’un système à l’...
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ژورنال
عنوان ژورنال: Publications mathématiques de l'IHÉS
سال: 1988
ISSN: 0073-8301,1618-1913
DOI: 10.1007/bf02698542