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  • 1
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    Storm severity detection (RF) (1985)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Atmospheric electrical emissions occurring in association with Hurricane Alicia were observed by two crossed baseline phase linear interferometers. The sensors were located in San Antonio, Texas, and at Marshall Space Flight Center (MSFC), Huntsville, Alabama. An analysis of the data has indicated that the direction finding (DF) performance of the San Antonio site was extremely good while the DF performance at the MSFC site evidenced erratic behavior. A check of the data acquisition hardware revealed an intermitted problem in one of the radio receiver channels. Since the system has experienced several lightning strikes during the early spring of 1984, it was necessary to ship the entire rack of equipment back to SwRI for refurbishment. Analysis of the DF data from the interferometer site at San Antonio is being done. A limited subset of the MSFC data acquired during Hurricane Alicia has been found to be valid. These were data which satisfied the phase linearity criteria. Approximately 2,000 location estimates have been produced on the valid data. The results of the DF analysis and the location data are being correlated with the McIDAS data base at Marshall Space Flight Center, and with the radar summary data provided by the Hurricane Research Division using the National weather Service radar Facility at Galveston, Texas.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA(MSFC FY-85 Atmospheric Processes Research Review; 2 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Storm severity detection (RF) (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Measurement of lightning location data which occur together with continental thunderstorms and hurricanes was examined, and a second phase linear interferometer was deployed. Electrical emission originating from tropical storms in the Gulf of Mexico were monitored. The time span between hurricane ALLEN (10 August 1980) and hurricane ALICIA (18 August 1983) represents the longest period that the United States has gone without hurricane landfall. Both systems were active and data were acquired during the landfall period of hurricane ALICIA.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA(MSFC FY-84 Atmospheric Processes Res. Rev.; p 99-100
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A study of the comparative performance of six lightning warning systems (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An analysis of mining explosive accident reports indicates a need for clear and ample warning of approaching electrical storms to reduce injuries/fatalities due to lightning induced premature detonation. Six lightning warning devices were comparatively evaluated at three test sites. The devices tested were: (1) flash counter, (2) corona point, (3) radioactive probe, (4) field mill, (5) azimuth/range locator, and (6) triangulation locator. The test sites were chosen to provide system evaluation under varied thunderstorm conditions. The devices were tested at San Antonio, Texas, Kennedy Space Center, Florida and Langmuir Laboratory, New Mexico. Comparative performance is reviewed in terms of alarm reliability, false alarm, and failure to alarm probabilities. Lightning warning system requirements and methods of relating warning criteria to explosive hazard are discussed.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Langley Res. Center Lightning Technol.; p 187-203
    Format: text
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  • 4
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    Film thickness measurements on five fluid formulations by the mercury squeeze film capacitance technique (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The thinning characteristics of five fluids were studied by measuring film thickness as a function of time. The mercury squeeze film capacitance technique was used. All tests were performed at room temperature. The synthetic hydrocarbon plus a nematic liquid crystal, N-(p-methoxybenzylidene)-p-butylaniline, thinned according to a Newtonian model and retained its bulk viscosity. The synthetic hydrocarbon plus a phosphonate antiwear additive and the synthetic hydrocarbon plus n-hexadecanol produced residual thick films. The synthetic hydrocarbon base fluids and the synthetic hydrocarbon plus a paraffinic resin displayed viscosity increases during thinning, but no residual films were formed.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TN-D-8171 , E-8554
    Format: application/pdf
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  • 5
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    Fundamental considerations for future solid lubricants (1969)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Properties important to the performance of solid lubricants are discussed. Those properties include shear characteristics, coherence between particles, resistance to cold flow, adherence to the substrate, applicable chemical thermodynamics and kinetics of materials and environments, polymorphism, and rheology. The following generalizations are made: (1) chemical thermodynamics and kinetics are powerful tools for use in determining the useful environments and methods of application for solid film lubricants; (2) the primary requirement for a solid lubricant is low shear strength; (3) the rheology of solid film constituents and formulations is likely to be of vital importance to performance and life; and (4) adherence and mobility of surface films is another primary requirement for long lived solid lubricants.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-X-52659 , E-5241 , Conf. on Solid Lubricants; Sep 09, 1969 - Sep 11, 1969; Kansas City, MO; United States
    Format: application/pdf
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  • 6
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    Pressure-viscosity measurements for several lubricants to 550 meganewtons per square meter /80,000 PSI/ and 149 C /300 F/ (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The viscosities of a number of liquid lubricants and lubricant formulations, determined as function of pressure, temperature, and shear stress by means of a high-pressure capillary viscometer, are reviewed. Where possible, these results are compared with those obtained by other techniques (optical elastohydrodynamics, oscillating crystal, and low shear capillary viscometry).
    Keywords: NONMETALLIC MATERIALS
    Type: ASLE PREPRINT 74LC-4C-1 , American Society of Lubrication Engineers and American Society of Mechanical Engineers, Joint Lubrication Conference; Oct 08, 1974 - Oct 10, 1974; Montreal; Canada
    Format: text
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