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  • MATERIALS  (2)
  • AIRCRAFT DESIGN, TESTING AND PERFORMANCE  (1)
  • autooxidation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Optimized assay for mammalian tyrosinase (polyhydroxyl phenyloxidase)
    Amsterdam : Elsevier
    Analytical Biochemistry 139 (1984), S. 345-352 
    Details
    ISSN: 0003-2697
    Keywords: autooxidation ; dihydroxyphenylalanine ; polyhydroxyl phenyloxidase ; radioassay ; tyrosinase assay
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0003-2697(84)90015-0
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Unknown
    OH-58 helicopter transmission failure analysis (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The OH-58 main transmission gearbox was run at varying output torques, speeds, and oil cooling rates. The gearbox was subsequently run to destruction by draining the oil from the gearbox while operating at a speed of 6200 revs per minute and 36,000 inch-pounds output torque. Primary cause of gearbox failure was overheating and melting of the planet bearing aluminum cages. Complete failure of the gearbox occurred in 28 1/2 minutes after the oil pressure dropped to zero. The alternating and maximum stresses in the gearbox top case were approximately 10 percent of the endurance limit for the material. Deflection of the bevel gear at 67000 inch-pounds output torque indicate a marginal stiffness for the bevel gear supporting system.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-X-71867 , E-8633
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Lubricant selection for gear designers (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Guide for gear designers, consisting of theory, calculations, charts, curves and references, explains lubrication requirements for gears to insure maximum performance. Mechanical and service variables are considered in order to obtain optimum gear performance under severe operating conditions.
    Keywords: MATERIALS
    Type: LEW-11483
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Lubricants and Additives Affect Spur-Gear Fatigue (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Surface-fatigue tests conducted with AISI 9310 steel spur gears show surface-fatigue life of AISI 9310 steel spur gears increased as much as 400 percent by addition of small amount of phosphorus-type extreme-pressure (EP) additive in lubricant. Antiwear or EP additives either absorbed onto surface or react with surface to form protective coating or surface film. Boundary film provides barrier that prevents contact of metal surfaces and provides low shear strength, which reduces friction coefficient below base metal.
    Keywords: MATERIALS
    Type: LEW-14314 , NASA Tech Briefs (ISSN 0145-319X); 10; 5; P. 84
    Format: text
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    NASA TECHNICAL REPORTS
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