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  • MATERIALS  (2)
  • MATERIALS, NONMETALLIC  (2)
  • Geomagnetism, Rock Magnetism and Palaeomagnetism  (1)
  • Mathematical and Computer Sciences (General)  (1)
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  • 1
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    Palaeomagnetic refinement of the eruption ages of Holocene lava flows, and implications for the eruptive history of the Tongariro Volcanic Centre, New Zealand (2016)
    Oxford University Press
    Details
    Publication Date: 2016-09-14
    Description: We present a detailed palaeomagnetic study from 35 sites on Holocene lava flows of the Tongariro Volcanic Centre, central North Island, New Zealand. Prior to the study the eruption ages of these flows were constrained to within a few thousand years by recently published high-precision 40 Ar/ 39 Ar geochronological data and tephrostratigraphic controls. Correlation of flow mean palaeomagnetic directions with a recently published continuous sediment record from Lake Mavora, Fiordland, allows us to reduce the age uncertainty to 300–500 yr in some cases. Our refined ages significantly improve the chronology of Holocene effusive eruptions of the volcanoes of the Tongariro Volcanic Centre. For instance, differences in the palaeomagnetic directions recorded by lavas from the voluminous Iwikau and Rangataua members suggest that individual effusive periods lasted up to thousands of years and that these bursts have been irregularly spaced over time. While over the last few millennia the effusive eruptive activity from Mt Ruapehu has been relatively quiet, the very young age (200–500 BP) of a Red Crater sourced flow suggests that effusive activity around Mt Tongariro lasted into the past few centuries. This adds an important hazard context to the historical record, which has otherwise comprised frequent relatively small, tephra producing, explosive eruptions without the production of lava flows.
    Keywords: Geomagnetism, Rock Magnetism and Palaeomagnetism
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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    PAPER CURRENT
  • 2
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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
  • 3
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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
  • 4
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    A Computer Program for the Computation of Running Gear Temperatures Using Green's Function (1996)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A new technique has been developed to study two dimensional heat transfer problems in gears. This technique consists of transforming the heat equation into a line integral equation with the use of Green's theorem. The equation is then expressed in terms of eigenfunctions that satisfy the Helmholtz equation, and their corresponding eigenvalues for an arbitrarily shaped region of interest. The eigenfunction are obtalned by solving an intergral equation. Once the eigenfunctions are found, the temperature is expanded in terms of the eigenfunctions with unknown time dependent coefficients that can be solved by using Runge Kutta methods. The time integration is extremely efficient. Therefore, any changes in the time dependent coefficients or source terms in the boundary conditions do not impose a great computational burden on the user. The method is demonstrated by applying it to a sample gear tooth. Temperature histories at representative surface locatons are given.
    Keywords: Mathematical and Computer Sciences (General)
    Type: NASA-TM-107241 , E-10286 , NAS 1.15:107241 , AD-A318138 , ARL-TR-1117 , Power Transmission and Gearing; Oct 06, 1996 - Oct 09, 1996; San Diego, CA; United States
    Format: application/pdf
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  • 5
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    Rolling-element fatigue and lubrication with fluorinated polyethers at cryogenic temperatures (1970)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Rolling-element fatigue and lubrication with fluorinated polyethers at cryogenic temperatures
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-TM-X-52863 , LUBRICATION CONF.; Oct 13, 1970 - Oct 15, 1970; CINCINNATI
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Rolling-element fatigue and lubrication with fluorinated polyethers at cryogenic temperatures (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Rolling ball fatigue and lubrication with fluorinated polyethers at cryogenic temperatures compared to superfined mineral oil
    Keywords: MATERIALS, NONMETALLIC
    Type: LUBRICATION CONFERENCE; Oct 12, 1970 - Oct 15, 1970; CINCINNATI, OH; US
    Format: text
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    NASA TECHNICAL REPORTS
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