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  • Other Sources  (23)
  • GEOPHYSICS  (23)
  • Chemical Engineering
  • 2005-2009
  • 1990-1994  (5)
  • 1970-1974  (18)
  • 1993  (5)
  • 1973  (18)
  • 1
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    Constraining proposed combinations of ice history and Earth rheology using VLBI determined baseline length rates in North America (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: We predict the present-day rates of change of the lengths of 19 North American baselines due to the glacial isostatic adjustment process. Contrary to previously published research, we find that the three dimensional motion of each of the sites defining a baseline, rather than only the radial motions of these sites, needs to be considered to obtain an accurate estimate of the rate of change of the baseline length. Predictions are generated using a suite of Earth models and late Pleistocene ice histories, these include specific combinations of the two which have been proposed in the literature as satisfying a variety of rebound related geophysical observations from the North American region. A number of these published models are shown to predict rates which differ significantly from the VLBI observations.
    Keywords: GEOPHYSICS
    Type: Smithsonian Astrophysical Observatory, Measurement and Interpretation of Crustal Deformation Rates Associated with Postglacial Rebound; 4 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Iron and nickel isotopic mass fractionation in deep-sea spherules (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Magnetite-wuestite spherules collected from deep-sea sediments are thought to have originally been Fe-Ni metal particles at the top of the atmosphere that were oxidized and melted during entry into the earth's atmosphere. Some likely sources for the metal particles are Fe-Ni interplanetary dust particles (IDP's) and metal or sulfide from stony IDP's that separated after melting. Davis et al. reported that four of these spherules are enriched in the heavy isotopes of iron, with enrichments of 8-23%/amu. We have developed a technique for analysis of both iron and nickel isotopes on the same ion microprobe spot and have applied this technique to a number of deep-sea spherules in order to better understand the processes leading to isotopic mass fractionation. Eight spherules show iron and nickel isotopic mass fractionation, with iron and nickel enriched in the heavy isotopes by 10-19%/amu and 4-32%/amu, respectively. If the mass fractionations are due to Rayleigh fractionation during evaporation, these spherules lost 76-94% of their original mass. We have analyzed the four magnetite-wuestite spherules for which iron isotopic data were reported by Davis et al. as well as four new spherules.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F; p 373-374
    Format: text
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  • 3
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    Ground pattern analysis in the Great Plains (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: REPT-2266-7 , Kansas Environ. and Resource Study: A Great Plains Model; 7 p
    Format: text
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  • 4
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    The resolution of temporal and spatial variations in auroral particle measurements from sounding rockets (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The problems involved in the resolution of the temporal/spatial ambiguity in sounding rocket observations are discussed with reference to an experiment involving a mother-daughter rocket combination, together with a flashing light beacon on the rocket and television cameras on the ground. The ambiguity was successfully removed, enabling a proper interpretation of the observations of precipitating low energy electrons to be made.
    Keywords: GEOPHYSICS
    Type: ESRO European Sounding-Rocket and Related Res. at High Latitudes; p 113-118
    Format: text
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  • 5
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    Constraining proposed combinations of ice history and earth rheology using VLBI determined baseline length rates in North America (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We predict the present-day rates of change of the lengths of 19 North American baselines due to the glacial isostatic adjustment process. Contrary to previously published research, we find that the three-dimensional motion of each of the sites defining a baseline, rather than only the radial motions of these sites, needs to be considered to obtain an accurate estimate of the rate of change of the baseline length. Predictions are generated using a suite of Earth models and late Pleistocene ice histories; these include specific combinations of the two which have been proposed in the literature as satisfying a variety of rebound related geophysical observations from the North American region. A number of these published models are shown to predict rates which differ significantly from the Very Long Base Interferometry (VLBI) observations.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 20; 21; p. 2387-2390
    Format: text
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  • 6
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    A study of the early detection of insect infestations and density/distribution of host plants (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10272 , NASA-CR-136658 , PR-10
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  • 7
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    Kansas environmental and resource study: A Great Plains model (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. Improvement in the land use classification accuracy of ERTS-1 MSS multi-images over Kansas can be made using two distances between neighboring grey tone N-tuples instead of one distance. Much more information is contained texturally than spectrally on the Kansas image. Ground truth measurements indicate that reflectance ratios of the 545 and 655 nm wavebands provide an index of plant development and possibly physiological stress. Preliminary analysis of MSS 4 and 5 channels substantiate the ground truth interpretation. Results of the land use mapping experiment indicate that ERTS-1 imagery has major potential in regionalization. The ways in which land is utilized within these regions may then be studied more effectively than if no adequate regionalization is available. A model for estimating wheat yield per acre has been applied to acreage estimates derived from ERTS-1 imagery to project the 1973 wheat yields for a ten county area in southwest Kansas. The results are within 3% of the preharvest estimates for the same area prepared by the USDA. Visual identification of winter wheat is readily achieved by using a temporal sequence of images. Identification can be improve by stratifying the project area into subregions having more or less homogeneous agricultural practices and crop mixes.
    Keywords: GEOPHYSICS
    Type: E74-10229 , NASA-CR-136492
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  • 8
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    A study of the early detection of insect infestations and density/distribution of host plants (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10174 , NASA-CR-136303 , PR-9
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  • 9
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    A study of the early detection of insect infestations and density/distribution of host plants (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10171 , NASA-CR-136298 , PR-8
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  • 10
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    The detection of 'intermediate' size magnetic anomalies in Cosmos 49 and OGO 2, 4, 6 data. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Benkova, Dolginov and Simonenko have recently reported the presence of intermediate size magnetic anomalies from Cosmos 49 data and hypothesized a crustal and/or upper mantle origin for these. We have examined the spherical harmonic models of the internal potential function, based on the OGO 2, 4 and 6 data and verified the locations and amplitudes of those anomalies with wavelengths of approximately 4000 km. The patterns of delta-F so computed were then compared with the IZMIRAN maps and also were analyzed statistically, in both the spatial and frequency domains, using residuals computed from the raw Cosmos 49 data. The two sets of data were thus derived from completely independent sets of observations and field references. The two patterns are shown to agree very well over the whole earth surface up to the 50 deg latitude limit of Cosmos 49.
    Keywords: GEOPHYSICS
    Type: NSSDC-ID-65-081A-05-PS , NSSDC-ID-67-073A-06-PS , NSSDC-ID-69-051A-21-PS , Plenary Meeting on Space research XIII; May 10, 1972 - May 24, 1972; Madrid; Spain
    Format: text
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