Optical Telescope Technology
Scientific and Technical Information Division, National Aeronautics and Space Administration, 1970 - 783 էջ
Design optics and technology for large spaceborne astronomical telescopes.
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Էջ 261 - Evaluation of Multipoint Interaction in the Design of a Thin Diffraction-Limited Active Mirror.
Էջ 589 - ... A low energy electron beam scans the surface of the silicon depositing charge such that the p-regions exposed to the beam are brought to cathode potential. Thus pn junctions are reverse biased by the beam. During the time that the electron beam is not on an element, the reverse bias voltage across the pn junction decreases as the result of transfer of charge across the junction. This charge arises from either internal generation of free carriers in the material or by photoexcited carriers in...
Էջ 187 - It is the purpose of this discussion to point out some of the possibilities of teaching shop processes in this manner. As Mr. Hesse indicated, "Shop Processes" is an extensive subject and its teaching must be regarded as a continuous project.
Էջ 621 - Laboratory for Astrophysics and Space Research of the Enrico Fermi Institute for Nuclear Studies at the University of Chicago — one of the first such university centers in the country. Here, in the sub-basement, in a concrete-shielded counting laboratory, scientists measure radioactivity of meteorites and "space dust" scraped from space flight capsules.
Էջ 296 - Cowper, GR: The Shear Coefficient in Timoshenko's Beam Theory.
Էջ 326 - March 1967. 9. Koopmans, TC, ed.: Activity Analysis of Production and Allocation. Cowles Commission, University of Chicago, 1951.
Էջ 241 - It is convenient in computation to use the same numbering system for bars, torsion bars, and joints. So far in these developments bars have been referred to as a and b. Referring to the numbering system shown above, it will be recognized that in reality a becomes i and b becomes i+1.
Էջ 392 - The two 150-inch telescopes for the Kitt Peak National Observatory and the Cerro Tololo Inter-American Observatory in Chile have solid mirrors of fused silica and Cer-Vit, respectively.
Էջ 677 - ... high cost for large aperture systems. Digital processing has the advantages of being extremely flexible, rather trouble-free and easy to use, once the programming system has been worked out. It also has the ability to handle problems which are nonlinear in both intensity and geometry and can solve these with an accuracy limited only by the user's knowledge of the incoming data. To...