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  • 1
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    Lengths of intermediate and deep seismic zones and temperatures in downgoing slabs of lithosphere (1979)
    In:  Geophys. J. R. astr. Soc., Tokyo, Conseil de l'Europe, vol. 56, no. 12, pp. 41-54, pp. L01306, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Subduction zone ; Seismicity ; Geothermics ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Experimental investigation of geologically produced antineutrinos with KamLAND (2005)
    In:  Nature, Amsterdam, Elsevier Scientific Publishing Company, vol. 436, no. 7050, pp. 499-503, pp. 1390
    Details
    Publication Date: 2005
    Keywords: Geothermics ; particle ; physics ; beta ; decay
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Global geodesy using Global Positioning System without fiducial sites (1992)
    In:  Geophys. Res. Lett., Oxford and Edinburgh, Blackwell Scientific Publications, vol. 19, no. 3, pp. 131-134, pp. 1484, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1992
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Geodesy ; GRL
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Field test of an experimental pulsed nuclear magnetism tool (1993)
    Soc. Professional Well Log Analysts, vol. 2, paper GGG
    In:  Transactions of the SPWLA 34th Ann. Logging Symp., Calgary, June 13-16, 1993, Washington, D. C., 220 pp., Soc. Professional Well Log Analysts, vol. 2, paper GGG, vol. C 560, 183 pp., no. 70, pp. 263-267, (ISBN 3-933346-037)
    Details
    Publication Date: 1993
    Keywords: Borehole geophys. ; NML ; FFI
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    The short-term prediction of universal time and length of day using atmospheric angular momentum (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The ability to predict short-term variations in the Earth's rotation has gained importance in recent years owing to more precise spacecraft tracking requirements. Universal time (UT1), that component of the Earth's orientation corresponding to the rotation angle, can be measured by number of high-precision space geodetic techniques. A Kalman filter developed at the Jet Propulsion Laboratory (JPL) optimally combines these different data sets and generates a smoothed times series and a set of predictions for UT1, as well as for additional Earth orientation components. These UT1 predictions utilize an empirically derived random walk stochastic model for the length of the day (LOD) and require frequent and up-to-date measurements of either UT1 or LOD to keep errors from quickly accumulating. Recent studies have shown that LOD variations are correlated with changes in the Earth's axial atmospheric angular momentum (AAM) over timescales of several years down to as little as 8 days. AAM estimates and forecasts out to 10 days are routinely available from meteorological analysis centers; these data can supplement geodetic measurements to improve the short-term prediction of LOD and have therefore been incorporated as independent data types in the JPL Kalman filter. We find that AAM and, to a lesser extent, AAM forecast data are extremely helpful in generating accurate near-real-time estimates of UT1 and LOD and in improving short-term predictions of these quantities out to about 10 days.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 99; B4; p. 6981-6996
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    NASA TECHNICAL REPORTS
  • 6
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    The Airborne Ocean Color Imager - System description and image processing (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The Airborne Ocean Color Imager was developed as an aircraft instrument to simulate the spectral and radiometric characteristics of the next generation of satellite ocean color instrumentation. Data processing programs have been developed as extensions of the Coastal Zone Color Scanner algorithms for atmospheric correction and bio-optical output products. The latter include several bio-optical algorithms for estimating phytoplankton pigment concentration, as well as one for the diffuse attenuation coefficient of the water. Additional programs have been developed to geolocate these products and remap them into a georeferenced data base, using data from the aircraft's inertial navigation system. Examples illustrate the sequential data products generated by the processing system, using data from flightlines near the mouth of the Mississippi River: from raw data to atmospherically corrected data, to bio-optical data, to geolocated data, and, finally, to georeferenced data.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Imaging Science and Technology (ISSN 8750-9237); 36; 5; p. 423-430.
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    NASA TECHNICAL REPORTS
  • 7
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    Daily estimates of the earth's pole position with the Global Positioning System (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Daily estimates of the earth's pole position have been obtained with measurements from a worldwide network of GPS receivers, obtained during the three week GIG '91 experiment in January-February 1991. For this short-term study, the GPS based polar motion series agrees with the other space based geodetic techniques (Very Long Baseline Interferometry and Satellite Laser Ranging) to about 0.4 mas rms, after the removal of mean biases of order 1-3 mas. The small error in day-to-day variability is not sensitive to the fiducial strategy used, nor are fiducial sites even necessary for monitoring high frequency pole position variability. The small biases indicate that the applied reference frames of the three geodetic techniques are nearly aligned, that the GPS fiducial errors are small, and that systematic errors in GPS are also small (of order 5 ppb). A well determined reference frame is necessary for monitoring the long-term stability of polar motion and for separating it from other long-term signals such as tectonic motion and internal systematic errors.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 19; 9, Ma
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    NASA TECHNICAL REPORTS
  • 8
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    Measuring the earth's rotation and orientation with GPS (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The possibilities for providing precise and frequent measurements of earth's orientation in space by using GPS technology are reviewed. In particular, attention is given to the concepts as polar motion and Universal Time, definition of reference frames for unambiguous measurements of earth's rotations, and data processing strategies. Some of the results achieved to date are examined, and it is shown that Universal Time changes can be measured using GPS with an accuracy of better than 100 microseconds over a few hours. Finally, future plans are discussed.
    Keywords: GEOSCIENCES (GENERAL)
    Type: GPS World (ISSN 1048-5104); 3; 5, Ma; 42
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    NASA TECHNICAL REPORTS
  • 9
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    Global geodesy using GPS without fiducial sites (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Baseline lengths and geocentric radii have been determined from GPS data without the use of fiducial sites. Data from the first GPS experiment for the IERS and Geodynamics (GIG '91) have been analyzed with a no-fiducial strategy. A baseline length daily repeatability of 2 mm + 4 parts per billion was obtained for baselines in the Northern Hemisphere. Comparison of baseline lengths from GPS and the global VLBI solution GLB659 (Caprette et al. 1990) show rms agreement of 2.1 parts per billion. The geocentric radius mean daily repeatability for all sites was 15 cm. Comparison of geocentric radii from GPS and SV5 (Murray et al. 1990) show rms agreement of 3.8 cm. Given n globally distributed stations, the n(n - 1)/2 baseline lengths and n geocentric radii uniquely define a rigid closed polyhedron with a well-defined center of mass. Geodetic information can be obtained by examining the structure of the polyhedron and its change with time.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 19; 131-134
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Software engineering as an engineering discipline (1988)
    In:  CASI
    Details
    Publication Date: 2004-12-04
    Description: The purpose of this panel is to explore the emerging field of software engineering from a variety of perspectives: university programs; industry training and definition; government development; and technology transfer. In doing this, the panel will address the issues of distinctions among software engineering, computer science, and computer hardware engineering as they relate to the challenges of large, complex systems.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: stems, RICIS 1988 Symposium p 129-147 stems, RICIS 1988 Symposium; p 127-147
    Format: text
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    NASA TECHNICAL REPORTS
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