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  • 1
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    Precursors to P'P' re-examined using broad band data (1989)
    In:  Geophys. J. Int., London, Army Corps of Engineers, Woodward-Clyde Consultants, vol. 99, no. 15, pp. 595-604, pp. 1013, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1989
    Keywords: P-waves ; Broad-band ; Seismology ; GJI
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Assessment of Global Positioning System measurements for studies of crustal deformation (1989)
    In:  J. Geophys. Res., London, Army Corps of Engineers, Woodward-Clyde Consultants, vol. 94, no. 4, pp. 13635-13650, pp. 1013, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1989
    Keywords: Geodesy ; Global Positioning System ; Earthquake precursor: deformation or strain ; Fault zone ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    The longer it has been since the last earthquake, the longer the expected time till the next? (1989)
    In:  Bull. Seism. Soc. Am., London, Army Corps of Engineers, Woodward-Clyde Consultants, vol. 79, no. B12, pp. 1439-1450, pp. 1013, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1989
    Keywords: Earthquake hazard ; Statistical investigations ; Recurrence of earthquakes ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Communications among elements of a space construction ensemble (1989)
    In:  CASI
    Details
    Publication Date: 2005-11-10
    Description: Space construction projects will require careful coordination between managers, designers, manufacturers, operators, astronauts, and robots with large volumes of information of varying resolution, timeliness, and accuracy flowing between the distributed participants over computer communications networks. Within the CSC Operations Branch, we are researching the requirements and options for such communications. Based on our work to date, we feel that communications standards being developed by the International Standards Organization, the CCITT, and other groups can be applied to space construction. We are currently studying in depth how such standards can be used to communicate with robots and automated construction equipment used in a space project. Specifically, we are looking at how the Manufacturing Automation Protocol (MAP) and the Manufacturing Message Specification (MMS), which tie together computers and machines in automated factories, might be applied to space construction projects. Together with our CSC industrial partner Computer Technology Associates, we are developing a MAP/MMS companion standard for space construction and we will produce software to allow the MAP/MMS protocol to be used in our CSC operations testbed.
    Keywords: SYSTEMS ANALYSIS
    Type: First Annual Symposium. Volume 1: Plenary Session; 9 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Reflectance and transmittance of snow at high spectral resolution (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A radiative-transfer model for the bidirectional reflectance-distribution function (BRDF) shows that snow is moderately anisotropic in the NIR wavelengths. Although the directional-hemispherical albedo of snow decreases as the grains become larger, the forward scattering also increases, with the result that the illumination and viewing geometry must be considered when interpreting physical properties of the surface layer of the snow pack from remote sensing data. Measurements of the BRDF and the transmittance for a variety of snow conditions were made throughout the winter and spring seasons with an SE-590 spectroradiometer, for wavelengths from 0.38 to 1.11 microns. Coincident with these, the surface grain properties were analyzed by stereological methods. A sphere with the same surface-to-volume ratio as the ice grains is used as the equivalent sphere.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Flow-induced morphological instabilities due to temporally-modulated stagnation-point flow (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The influence of periodically-modulated planar stagnation-point flow on the morphological stability of a directionally-solidifying interface is presently considered with a view to the effect of unsteady nonparallel flows on single-crystal growth. The modeling of the system assumes that the viscous boundary layer thickness is much greater than that of the solute boundary layer, and that the modulation frequency is much smaller than the strength of plane stagnation-point flow. The solidifying interface is either stabilized or destabilized depending on the ratio of the period of modulation to the solute-diffusion time.
    Keywords: MATERIALS PROCESSING
    Type: Journal of Crystal Growth (ISSN 0022-0248); 96; 4, Au; 737-746
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Morphological instabilities in directional solidification of a binary alloy - End effects (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: This paper considers the unidirectional solidification of a binary alloy for which the liquid and solid phases are bounded by endwalls. In order to account for the transport of latent heat and solute, thermal and solutal boundary layers must be placed at the solidifying interface. Further, under the assumption of fixed temperature gradients, the presence of the endwalls leads to a velocity of solidification that decreases with time, and hence to an unsteady basic state having a planar interface. From a stability analysis of this state, a nonlinear long-wave evolution equation of Sivashinsky type is derived, with modified coefficients, that shows how the onset of cellular structure is delayed by the presence of endwalls.
    Keywords: SOLID-STATE PHYSICS
    Type: SIAM Journal on Applied Mathematics (ISSN 0036-1399); 49; 152-164
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Covariance of greenness and terrain variables over the Konza Prairie (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An analysis is made of time-dependent covariance of the greenness vegetation index with mapped terrain variables over the Konza Prarie (Kansas) during the 1987 growing season. The analysis was part of an ongoing project to establish appopriate ground-sampling and data-integration strategies for satellite-based monitoring of land surface climate conditions. Greenness images for six dates between May and October were derived from atmospherically corrected thematic mapper (TM) data and coregistered with maps of woody vegetation, fire, and soils. Local variance in greenness peaked in mid-June, falling rapidly until mid-August, and declining gradually thereafter. Greenness images exhibited positive autocorrelation up to distances of 180-210 m, but the dominant scale of pattern occurred at a block size of 60 m by 60 m throughout the growing season. 40-44 percent of total scene variance in July and August was accounted for by the effects of woody vegetation (8.9 percent of the area), prairie burning, and soil type. The effect of these terrain variables was fairly consistent between June and late August and was manifested as additional high-frequency spatial variation in imagery from that period.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Enhanced rotor modeling tailored for rub dynamic stability analysis and simulation (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: New methods are presented that allow straightforward application of complex nonlinearities to finite element based rotor dynamic analyses. The key features are: (1) the methods can be implemented with existing finite element or dynamic simulation programs, (2) formulation is general for simple application to a wide range of problems, and (3) implementation is simplified because nonlinear aspects are separated from the linear part of the model. The new techniques are illustrated with examples of inertial nonlinearity and torquewhirl which can be important in rubbing turbomachinery. The sample analyses provide new understanding of these nonlinearities which are discussed.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA, Lewis Research Center, Rotordynamic Instability Problems in High-Performance Turbomachinery, 1988; p 431-444
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Incorporating general race and housing flexibility and deadband in rolling element bearing analysis (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Methods for including the effects of general race and housing compliance and outer race-to-housing deadband (clearance) in rolling element bearing mechanics analysis is presented. It is shown that these effects can cause significant changes in bearing stiffness characteristics, which are of major importance in rotordynamic response of turbomachinery and other rotating systems. Preloading analysis is demonstrated with the finite element/contact mechanics hybrid method applied to a 45 mm angular contact ball bearing.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA, Lewis Research Center, Rotordynamic Instability Problems in High-Performance Turbomachinery, 1988; p 373-387
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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