PET-scan
发表于 2025-3-28 15:55:33
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方便
发表于 2025-3-28 20:47:40
The Electroluminescence of Zinc Sulfidethe laser spot and a beam splitter to produce a pair of spots which scan across a pair of plates. It scans a pair of plates in this mode in four hours with 1 micron repeatability. The APS is currently being used to scan the 936 pairs of plates comprising the Palomar Observatory-National Geographic S
生气地
发表于 2025-3-29 00:37:43
Wesley T. Huntress Jr.,Mikhail Ya. Marov, to supporting the use of Hubble Space Telescope (HST) by providing guide stars for pointing and calibrated images for observation-planning, and, on the scientific side, to applying the same resources to selected programs in community service and astrophysics.
敲竹杠
发表于 2025-3-29 05:46:28
Wesley T. Huntress Jr.,Mikhail Ya. Marovs a tradeoff between coarse sample intervals that, while economical, do not allow the faithful reproduction of the information in photographic material, and fine intervals, which can record all of the information, but at a prohibitive cost. We investigate these issues by conducting Fourier analyses
majestic
发表于 2025-3-29 09:09:18
Wesley T. Huntress Jr.,Mikhail Ya. Marovn a few hours photographic plates up to 14″ × 14″ with a positional accuracy of 1μm (repeatability: 0.2μm) and a photometric accuracy of 2% over a dynamical range of 3 densities. The detector is a RETICON CCPD array with 1024 photodiodes. X and Y coordinates are measured with Heidenhain encoders. Au
金丝雀
发表于 2025-3-29 14:47:22
Preface to the First and Second Edition81, PhD thesis). As the name of the measuring machine suggests, a major part of its functionality is to accurately measure photographic densities. Although the old epoch Palomar Observatory Sky Survey (POSS) plates cannot be used for accurate photometry, many other plates, including the new epoch PO
HALL
发表于 2025-3-29 18:47:05
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大雨
发表于 2025-3-29 21:21:02
Welcoming Address: Two Thousand Years of Optical Sky Surveys which form them. Aratus’ survey is based on one now lost, by Eudoxus, who visited Alexandria for the purpose of examining the records of observations kept in the library and for consultations with the community of scholars there — these observations were originally made about 2000 BC, perhaps from Minos in Crete.
myalgia
发表于 2025-3-30 02:59:01
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BIPED
发表于 2025-3-30 06:01:58
Digitised Sky Surveys at the Space Telescope Science Institute, to supporting the use of Hubble Space Telescope (HST) by providing guide stars for pointing and calibrated images for observation-planning, and, on the scientific side, to applying the same resources to selected programs in community service and astrophysics.