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  • INSTRUMENTATION AND PHOTOGRAPHY  (1)
  • Life Sciences (General)  (1)
  • MECHANICS  (1)
  • 1
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    Effect of five lubricants on life of AISI 9310 spur gears (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Spur-gear surface fatigue tests were conducted with five lubricants using a single lot of consumable-electrode vacuum melted (CVM) AISI 9310 spur gears. The lot of gears was divided into five groups, each of which was tested with a different lubricant. The test lubricants are classified as either a synthetic hydrocarbon, mineral oil, or ester-based lubricant. All five lubricants have imilar viscosity and pressure-viscosity coefficients. A pentaerythritol base stock without sufficient antiwear additives produced a surface fatigue life pproximately 22 percent that of the same base stock with chlorine and phosphorus type additives. The presence of sulfur type antiwear additives in the lubricant did not appear to affect the surface fatigue life of the gears tested. No statistical difference in the 10-percent surface fatigue life was produced with four of the five lubricants.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TP-2419 , E-2183 , NAS 1.60:2419
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Fatigue life of spur and helical gear sets (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Mathematical model is used to determine surface fatigue life of spur and helical gears. Can also be used to calculate dynamic capacity.
    Keywords: MECHANICS
    Type: LEW-12596 , NASA Tech Briefs (ISSN 0145-319X); 1; 2; P. 238
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Biological-Physical Coupling in the Gulf of Maine: Satellite and Model Studies of Phytoplankton Variability (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The goals of this project were to acquire, process, QC, archive and analyze SeaWiFS chlorophyll fields over the Gulf of Maine and Scotia Shelf region. The focus of the analysis effort was to calculate and quantify seasonality and interannual. variability of SeaWiFS-measured phytoplankton biomass in the study area and compare these to physical forcing and hydrography. An additional focus within this effort was on regional differences within the heterogeneous biophysical regions of the Gulf of Maine / Scotia Shelf. Overall goals were approached through the combined use of SeaWiFS and AVHRR data and the development of a coupled biology-physical numerical model.
    Keywords: Life Sciences (General)
    Type: NRA-97-MTPE-01 , 2002 Ocean Sciences Meeting HI: Seasonal and Interannual Phytoplankton Variability in the Gulf of Maine; Jan 01, 2002; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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