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  • ASTROPHYSICS  (1)
  • MECHANICAL ENGINEERING  (1)
  • formation clearance
  • 1985-1989  (2)
  • 1989  (2)
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  • 1985-1989  (2)
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  • 1
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    Unknown
    The carbon chemistry of meteorites: Relationships to comets (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The carbonaceous meteorites exhibiting alteration by liquid water bear a strong relationship to comets. Not only is their elemental composition closer to solar in relative abundances than other meteorites, they are water rich; and they contain isotopic compositions among refractory and volatile elements indicative of presolar components. Some of these isotopic anomalies occur in organic compounds and carbonaceous grains signifying the presence of discrete and identifiable carbon components derived from interstellar and circumstellar matter. Insofar as comets and meteorites are ultimately formed from interstellar gas and dust, and comets have been subjected to considerably less aqueous and thermal evolution than carbonaceous meteorites, the interstellar imprint should be much stronger and better preserved in comets.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Workshop on Analysis of Returned Comet Nucleus Samples; p 13-14
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Computer aided design of bevel gear tooth surfaces (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper presents a computer-aided design procedure for generating bevel gears. The development is based on examining a perfectly plastic, cone-shaped gear blank rolling over a cutting tooth on a plane crown rack. The resulting impression on the plastic gear blank is the envelope of the cutting tooth. This impression and envelope thus form a conjugate tooth surface. Equations are presented for the locus of points on the tooth surface. The same procedures are then extended to simulate the generation of a spiral bevel gear. The corresponding governing equations are presented.
    Keywords: MECHANICAL ENGINEERING
    Type: 1989 International Power Transmission and Gearing Conference; Apr 25, 1989 - Apr 28, 1989; Chicago, IL; United States
    Format: text
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    NASA TECHNICAL REPORTS
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