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  • 1
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    Satellite-derived surface latent heat fluxes in a rapidly intensifying marine cyclone (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Surface latent heat fluxes are estimated in the vicinity of a rapidly deepening cyclone before and during its period of most rapid intensification. This was done with a bulk parameterization scheme and remotely sensed input data. A method is studied for estimating the difference in specific humidity between the surface and a ten meter height using the Special Sensor Microwave/Imager (SSM/I) observed integrated water vapor field and a sea surface temperature analysis. The surface latent heat flux fields generally have estimated errors below 40 pct. south of 40 deg. N and outside the region of high integrated water vapor values associated with frontal bands. The method of estimating surface latent heat fluxes for the case study was found to be usable in most regions of the Northwest Atlantic Ocean except for those locations directly adjacent to coastlines in instances of offshore flow and in the vicinity of surface fronts.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Microwave Radiometer Studies of Atmospheric Water Over the Oceans, Volume 1; p 1-40
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    DOD (USAF) turbulence accidents and incidents (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A summary of Air Force turbulence related mishaps for the last ten years of Air Force mishaps is presented from a perspective of where it has been, where it is now, and where it is going. In addition to accounts of major mishaps, a summary of what actions were taken to preclude future similar mishaps is presented. Also, a discussion of some of the things being done now and being planned for the future to prevent turbulence related mishaps is presented.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA. Langley Research Center Atmospheric Turbulence Relative to Aviation, Missile and Space Programs; p 17-25
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    SSM/I Rainfall Volume Correlated with Deepening Rate in Extratropical Cyclones (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: With the emergence of reasonably robust, physically based rain rate algorithms designed for the Special Sensor Microwave/Imager (SSM/I), a unique opportunity exists to directly observe a physical component which can contribute to or be a signature of cyclone deepening (latent heat release). The emphasis of the research in this paper is to seek systematic differences in rain rate observed by the SSM/I, using the algorithm of Petty in cases of explosive and nonexplosive cyclone deepening.
    Keywords: Meteorology and Climatology
    Type: NASA-CR-202494 , NAS 1.26:202494 , Seventh Conference on Satellite Meteorolgy and Oceanography; 338-340
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Making statistical inferences about software reliability (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Failure times of software undergoing random debugging can be modelled as order statistics of independent but nonidentically distributed exponential random variables. Using this model inferences can be made about current reliability and, if debugging continues, future reliability. This model also shows the difficulty inherent in statistical verification of very highly reliable software such as that used by digital avionics in commercial aircraft.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-4197 , NAS 1.26:4197
    Format: application/pdf
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  • 5
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    Making statistical inferences about software reliability (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Failure times of software undergoing random debugging can be modeled as order statistics of independent but nonidentically distributed exponential random variables. Using this model inferences can be made about current reliability and, if debugging continues, future reliability. This model also shows the difficulty inherent in statistical verification of very highly reliable software such as that used by digital avionics in commercial aircraft.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Format: text
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  • 6
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    A nonparametric software reliability growth model (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Miller and Sofer have presented a nonparametric method for estimating the failure rate of a software program. The method is based on the complete monotonicity property of the failure rate function, and uses a regression approach to obtain estimates of the current software failure rate. This completely monotone software model is extended. It is shown how it can also provide long-range predictions of future reliability growth. Preliminary testing indicates that the method is competitive with parametric approaches, while being more robust.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-186438 , NAS 1.26:186438
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Type Ia supernovae as standard candles (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The distribution of absolute blue magnitudes among Type Ia supernovae (SNs Ia) is studied. Supernovae were used with well determined apparent magnitudes at maximum light and parent galaxies with relative distances determined by the Tully-Fisher or Dn - sigma techniques. The mean absolute blue magnitude is given and the observational dispersion is only sigma(MB) 0.36, comparable to the expected combined errors in distance, apparent magnitude, and extinction. The mean (B-V) color at maximum light is 0.03 +/- 0.04, with a dispersion sigma(B-V) = 0.20. The Cepheid-based distance to IC 4182, the parent galaxy of the normal and unextinguished Type Ia SN 1937C, leads to a Hubble constant of H(0) + 51 +/- 12 km/s Mpc. The existence of a few SNs Ia that appear to have been reddened and dimmed by dust in their parent galaxies does not seriously compromise the use of SNs Ia as distance indicators.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 405; 1; p. L5-L8.
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Satellite-derived surface latent heat fluxes in a rapidly intensifying marine cyclone (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The aim of this article is to estimate surface latent heat fluxes in the vicinity of a rapidly deepening cyclone before and during its period of most rapid intensification. This is done with a bulk parameterization scheme and remotely sensed input data. A method for estimating the difference in specific humidity between the surface and a 10-m height is investigated using the Special Sensor Microwave/Imager-observed integrated water vapor field and a sea surface temperature analysis. The surface latent heat flux fields generally have estimated errors below 40 percent south of 40 deg N and outside the region of high integrated water vapor values associated with frontal bands. The method of estimating surface latent heat fluxes for the case study was found to be usable in most regions of the northwest Atlantic Ocean except for those locations directly adjacent to coastlines in instances of offshore flow and in the vicinity of surface fronts.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Monthly Weather Review (ISSN 0027-0644); 120; 7 Ju
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    An example of estimates of precipitable water derived from Nimbus-7 SMMR satellite measurements and FGGE upper air data (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A sample of results from the Scanning Multichannel Microwave Radiometer (SMMR) instrument aboard the Nimbus-7 satellite is compared with those obtained from analyses of First GARP Global Experiment Level III-b data collected over the South Pacific on January 10-18, 1979, when the South Pacific Convergence Zone and its accompanying cloud band were quasi-stationary features of this ocean's circulation. It is found that the patterns of Goddard Laboratory for Atmospheres precipitable water values compare well with patterns of the SMMR brightness temperature differences.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Conference on Satellite Meteorology and Oceanography; Feb 01, 1988 - Feb 05, 1988; Anaheim, CA; United States
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    NASA TECHNICAL REPORTS
  • 10
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    Software reliability models for fault-tolerant avionics computers and related topics (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Software reliability research is briefly described. General research topics are reliability growth models, quality of software reliability prediction, the complete monotonicity property of reliability growth, conceptual modelling of software failure behavior, assurance of ultrahigh reliability, and analysis techniques for fault-tolerant systems.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-181440 , NAS 1.26:181440
    Format: application/pdf
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