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  • Other Sources  (7)
  • 2015-2019
  • 1990-1994  (4)
  • 1975-1979  (3)
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  • 1
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    Unknown
    Metal etching composition (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The present invention is directed to a chemical etching composition for etching metals or metallic alloys. The composition includes a solution of hydrochloric acid, phosphoric acid, ethylene glycol, and an oxidizing agent. The etching composition is particularly useful for etching metal surfaces in preparation for subsequent fluorescent penetrant inspection.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Format: application/pdf
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  • 2
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    Accretional capture of the moon (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The effectiveness of accretional capture is studied with the aid of a simple model involving a small secondary body in a hyperbolic orbit which approaches a large primary body. When the separation is a minimum, the mass of the primary body increases. An investigation is conducted regarding the conditions under which this change in mass will result in an elliptic orbit with capture.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 258; Nov. 20
    Format: text
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  • 3
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    The non-homogeneous accumulation model for terrestrial planet formation and the consequences for the atmosphere of Venus (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The nonhomogeneous-accumulation model for the formation of the terrestrial planets is described, and its consequences for the formation of the Venusian atmosphere are assayed in the context of our knowledge of the composition of the earth and carbonaceous chondrites. The relative abundances of the low-temperature condensibles in the reservoirs at the earth's surface are applied to Venus. Although carbonaceous chondrites show similar properties for the chemically bound elements, they show large deficiencies for the rare gases. The major gases on Venus, by volume, are predicted to be 98.12% CO2, 1.86% N2 and 0.02% Ar-40.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 4
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    Unknown
    Definition of Tire Properties Required for Landing System Analysis (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The data bank constructed provided two basic advantages for the user of aircraft tire information. First, computerization of the data bank allowed mechanical property data to be stored, corrected, updated, and revised quickly and easily as more reliable tests and measurements were carried out. Secondly, the format of the book which can be printed from the computerized data bank can be easily adjusted to suit the needs of the users without the great expense normally associated with reprinting and editing books set by ordinary typography.
    Keywords: ENGINEERING (GENERAL)
    Type: NASA-CR-156171 , UMICH-012881
    Format: application/pdf
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  • 5
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    Unknown
    Compact Pinch Welder (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Spot welder designed for bonding insulated metal strips together. Compact, measuring only about 33.5 cm in its largest linear dimension. Pinch welder clamps electrodes on weldments with strong, repeatable force. Compressed air supplied through fitting on one handle. Small switch on same handle starts welding process when operator presses it with trigger. Provides higher, more repeatable clamping force than manually driven gun and thus produces weld joints of higher quality. Light in weight and therefore positioned precisely by operator.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-29670 , NASA Tech Briefs (ISSN 0145-319X); 15; 6; P. 109
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  • 6
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    Milder Etchant For Penetrant Inspection (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: New etching solution for chemical penetrant inspection of Inconel(R) 718 castings and weldments. Etchant does not introduce artifacts mistaken for defects. Applied by swabbing or by immersion. Used to detect unwanted residues of Nioro(R) (or equivalent) gold brazing alloy on type 347 stainless steel.
    Keywords: MATERIALS
    Type: MFS-29645 , NASA Tech Briefs (ISSN 0145-319X); 14; 9; P. 63
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  • 7
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    Prepenetrant Etchant For Incology(R) 903 Weld Overlays (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Etching solution developed for use prior to type-IVc penetrant inspection of Incology(R) 903 weld overlays. Formulated as follows: 80 g ferric chloride hexahydrate, 300 mL reagent-grade hydrochloric acid, 25 mL food- or reagent-grade phosphoric acid, and 100 mL ethylene glycol. Gives more reasonable range of etching time and reduces probability of overetching and resulting damage. Stored indefinitely.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-29576 , NASA Tech Briefs (ISSN 0145-319X); 14; 4; P. 78
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