808 resultados para TRANSFORMADA DE FOURIER


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With this are bound: Passot, L. Théorie sociétaire de Charles Fourier, 1841; and Arcy, Marie d'. Théorie sociétaire de Ch. Fourier, 1841.

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Translation of: Solidarité.

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Available on demand as hard copy or computer file from Cornell University Library.

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Vol. 2 has title: Introduction to the mathematical theory of the conduction of heat in solids. First published in 1906 in 1 vol. with title: Fourier's series and conduction of heat.--cf. Pref.

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Microfilm. Ann Arbor, Mich., Xerox University Microfilms, 1973. 35 mm. (American Culture Series, reel 544.6)

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Mode of access: Internet.

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Published in 1844 under the title: A concise exposition of the doctrine of association.

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Bibliography: p. 23.

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"'La théorie de l'unité universelle' a paru primitivement sous le titre de 'Traité de l'association domestique-agricole, ou Attraction industrielle'."

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Bibliography: Fournier's series: p. [411]-418; The conduction of heat: p.[419]-429.

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Optical coherence tomography (OCT) is an emerging coherence-domain technique capable of in vivo imaging of sub-surface structures at millimeter-scale depth. Its steady progress over the last decade has been galvanized by a breakthrough detection concept, termed spectral-domain OCT, which has resulted in a dramatic improvement of the OCT signal-to-noise ratio of 150 times demonstrated for weakly scattering objects at video-frame-rates. As we have realized, however, an important OCT sub-system remains sub-optimal: the sample arm traditionally operates serially, i.e. in flying-spot mode. To realize the full-field image acquisition, a Fourier holography system illuminated with a swept-source is employed instead of a Michelson interferometer commonly used in OCT. The proposed technique, termed Fourier-domain OCT, offers a new leap in signal-to-noise ratio improvement, as compared to flying-spot OCT systems, and represents the main thrust of this paper. Fourier-domain OCT is described, and its basic theoretical aspects, including the reconstruction algorithm, are discussed. (C) 2004 Elsevier B.V. All rights reserved.

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An approach reported recently by Alexandrov et al (2005 Int. J Imag. Syst. Technol. 14 253-8) on optical scatter imaging, termed digital Fourier microscopy (DFM), represents an adaptation of digital Fourier holography to selective imaging of biological matter. The holographic mode of the recording of the sample optical scatter enables reconstruction of the sample image. The form-factor of the sample constituents provides a basis for discrimination of these constituents implemented via flexible digital Fourier filtering at the post-processing stage. As in dark-field microscopy, the DFM image contrast appears to improve due to the suppressed optical scatter from extended sample structures. In this paper, we present the theoretical and experimental study of DFM using a biological phantom that contains polymorphic scatterers.