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  • GEOPHYSICS  (5)
  • COMPOSITE MATERIALS  (3)
  • 1990-1994  (8)
  • 1985-1989
  • 1960-1964
  • 1993  (8)
  • 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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    Advanced composites technology program (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: This paper provides a brief overview of the NASA Advanced Composites Technology (ACT) Program. Critical technology issues that must be addressed and solved to develop composite primary structures for transport aircraft are delineated. The program schedule and milestones are included. Work completed in the first 3 years of the program indicates the potential for achieving composite structures that weigh less and are cost effective relative to conventional aluminum structure. Selected technical accomplishments are noted. Readers who are seeking more in-depth technical information should study the other papers included in these proceedings.
    Keywords: COMPOSITE MATERIALS
    Type: Third NASA Advanced Composites Technology Conference, Volume 1, Part 1; p 49-78
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    NASA TECHNICAL REPORTS
  • 3
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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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    NASA TECHNICAL REPORTS
  • 4
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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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    NASA TECHNICAL REPORTS
  • 5
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    Third NASA Advanced Composites Technology Conference, volume 1, part 1 (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This document is a compilation of papers presented at the Third NASA Advanced Composites Technology (ACT) Conference. The ACT Program is a major multi-year research initiative to achieve a national goal of technology readiness before the end of the decade. Conference papers recorded results of research in the ACT Program in the specific areas of automated fiber placement, resin transfer molding, textile preforms, and stitching as these processes influence design, performance, and cost of composites in aircraft structures. Papers sponsored by the Department of Defense on the Design and Manufacturing of Low Cost Composites (DMLCC) are also included in Volume 2 of this document.
    Keywords: COMPOSITE MATERIALS
    Type: NASA-CP-3178-VOL-1-PT-1 , L-17167A-VOL-1-PT-1 , NAS 1.55:3178-VOL-1-PT-1 , Jun 08, 1992 - Jun 11, 1992; Long Beach, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Third NASA Advanced Composites Technology Conference, volume 1, part 2 (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This document is a compilation of papers presented at the Third NASA Advanced Composites Technology (ACT) Conference held at Long Beach, California, 8-11 June 1992. The ACT Program is a major multi-year research initiative to achieve a national goal of technology readiness before the end of the decade. Conference papers recorded results of research in the ACT Program in the specific areas of automated fiber placement, resin transfer molding, textile preforms, and stitching as these processes influence design, performance, and cost of composites in aircraft structures. Papers sponsored by the Department of Defense on the Design and Manufacturing of Low Cost Composites (DMLCC) are also included in Volume 2 of this document.
    Keywords: COMPOSITE MATERIALS
    Type: NASA-CP-3178-VOL-1-PT-2 , L-17167B-VOL-1-PT-2 , NAS 1.55:3178-VOL-1-PT-2 , Jun 08, 1992 - Jun 11, 1992; Long Beach, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Measurement and interpretation of crustal deformation rates associated with postglacial rebound (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This project involves obtaining Global Positioning System (GPS) measurements in Scandinavia, and using the measurements to estimate the viscosity profile of the Earth's mantle and to correct tide-gage measurements for the rebound effect. Several aspects of this project are reported.
    Keywords: GEOPHYSICS
    Type: NASA-CR-192245 , NAS 1.26:192245
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Measurement and Interpretation of Crustal Deformation Rates Associated with Postglacial Rebound (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This project involves obtaining GPS measurements in Scandinavia, and using the measurements to estimate the viscosity profile of the Earth's mantle and to correct tide-gauge measurements for the rebound effect. Below, we report on several aspects of this project. The DSGS was occupied in August 1993. This campaign also inaugurated SWEPOS, the Swedish permanent GPS network. Initial results are presented in Johansson et al., a copy of which is contained in Appendix A. An important technical advance we intend for this project is to use the full three dimensional site velocity information for inferring geophysical parameters. To this end, we have investigated using VLBI determined baseline length rates in North America to constraining proposed combinations of ice history and earth rheology, and presented this work in Mitrovica et al., a copy of which is contained in Appendix B.
    Keywords: GEOPHYSICS
    Type: NASA-CR-195193 , NAS 1.26:195193
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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