高射炮
发表于 2025-3-28 16:05:58
The mid- and far-infrared range: radiation emission processes from interstellar dust and gas,lecules in the gaseous state. Together, these signatures provide unique diagnostic probes of the physical and chemical conditions of the cool and dusty Universe. This article summarizes the contribution of space-based observations in the thermal infrared to our understanding of the Universe. In part
小教堂
发表于 2025-3-28 20:18:51
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Transfusion
发表于 2025-3-29 01:31:34
Imaging through Compton scattering and pair creation, 0.3 MeV to ≈ 300 GeV. The principles of measurement of both kinds of telescopes are explained and an overview of early Compton and pair telescopes is given. The properties and capabilities of COMPTEL and EGRET aboard NASA’s . are described. These two instruments have performed the first-ever all-sk
思考才皱眉
发表于 2025-3-29 04:52:53
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Encapsulate
发表于 2025-3-29 09:30:49
Far-infrared imaging and spectroscopic instrumentation,genic instruments and telescopes introduced. We give an introduction to direct detection techniques for imaging and spectroscopy and review the current state of the art in instrumentation and detector technology. We discuss the history of space-borne infrared missions dedicated to photometric survey
fatty-streak
发表于 2025-3-29 13:20:47
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食料
发表于 2025-3-29 16:30:46
High-accuracy positioning: astrometry, light. A theoretical expression for the limiting accuracy is derived under idealized conditions and generalized to take into account more realistic circumstances, such as additive noise and finite pixel size. Its application is discussed in relation to different space-astrometry techniques includin
整洁漂亮
发表于 2025-3-29 20:58:40
Interferometric imaging from space,ular resolution. The van Cittert–Zernike theorem forms the theoretical foundation of interferometric measurements and for the reconstruction of images from interferometric data. The closure phase method and phase self-calibration techniques retain useful phase information even if the individual phas
Cursory
发表于 2025-3-30 02:28:45
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低能儿
发表于 2025-3-30 07:36:47
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