984 resultados para Astronomical observatories


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Imprint varies: Albany, N.Y., June 1859-June 1860.

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Title varies slightly.

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Title from vol. title page.

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Published <1980-2007>: Oxford : Blackwell, for the Society; <2010-2011>: Wiley-Blackwell for the Society.

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"The material ... is partly a preprint of selected pages from The American ephemeris and nautical almanac."

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Tables for timekeeping for each day of the 12 months of the Gregorian calendar.

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"Air research and Development Command, Air Force Office of Scientific Research, Mechanics Division. Contract no. AF 49(638) - 498."

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Mode of access: Internet.

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Sparse representation of astronomical images is discussed. It is shown that a significant gain in sparsity is achieved when particular mixed dictionaries are used for approximating these types of images with greedy selection strategies. Experiments are conducted to confirm (i) the effectiveness at producing sparse representations and (ii) competitiveness, with respect to the time required to process large images. The latter is a consequence of the suitability of the proposed dictionaries for approximating images in partitions of small blocks. This feature makes it possible to apply the effective greedy selection technique called orthogonal matching pursuit, up to some block size. For blocks exceeding that size, a refinement of the original matching pursuit approach is considered. The resulting method is termed "self-projected matching pursuit," because it is shown to be effective for implementing, via matching pursuit itself, the optional backprojection intermediate steps in that approach. © 2013 Optical Society of America.

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ACM Computing Classification System (1998): J.2.

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ACM Computing Classification System (1998): J.2.

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ACM Computing Classification System (1998): J.2.

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ACM Computing Classification System (1998): H.5.2, H.2.8, J.2, H.5.3.

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ACM Computing Classification System (1998): I.2.8, I.2.10, I.5.1, J.2.