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  • Other Sources  (6)
  • Lunar and Planetary Science and Exploration  (3)
  • NUCLEAR ENGINEERING  (3)
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  • Other Sources  (6)
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  • 1
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    An Achondritic Micrometeorite from Antarctica: Expanding the Solar System Inventory of Basaltic Asteroids (2005)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Micrometeorites with sizes below 1 mm are collected in a diversity of environments such as deep-sea sediments and polar caps. Chemical, mineralogical and isotopic studies indicate that micrometeorites are closely related to primitive carbonaceous chondrites that amount to only approximately 2% of meteorite falls. While thousands of micrometeorites have been studied in detail, no micrometeorite has been found so far with an unambiguous achondritic composition and texture. One melted cosmic spherule has a low Fe/Mn ratio similar to that of eucrites, the most common basaltic meteorite group. Here we report on the texture, mineralogy, Rare Earth Elements (REEs) abundance and oxygen isotopic composition of the unmelted Antarctic micrometeorite 99-21-40 that has an unambiguous basaltic origin.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXVI, Part 7; LPI-Contrib-1234-Pt-7
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Autonomous navigation ability: FIDO test results (2000)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The FIDO platform of the JPL has been used to evaluate the ability of autonomous obstacle avoidance developed by JPL and CNES autonomous long range path planning. The test results show that only a very small amount of energy and computing time is used to implement autonomy and that the capabilities of the rover are fully used, allowing a much longer daily traverse than purely ground-planned strategies.
    Keywords: Lunar and Planetary Science and Exploration
    Type: 6th ESA Workshop on Advanced Space Technologies for Robotics and Automation; Noordwijk; Netherlands
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Comments on 'Elastically scattered recoil nuclei in solid-state detectors' (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Horn and Von Oertzen (1967) have shown that tracks in mica are produced by an irradiation with 32-MeV O-16 ions. These tracks were attributed to K and Fe recoils produced by elastic scattering of the incident oxygen beam. In the present work an alternate explanation of their observations is provided. The measured characteristics of the tracks are shown to be compatible with theoretical predictions for production of tracks by inelastic (mostly compound nucleus) reactions with silicon and to be inconsistent with the previously proposed elastic scattering process. The possibility that the tracks are produced by contaminant ions in the beam cannot be ruled out.
    Keywords: NUCLEAR ENGINEERING
    Type: Radiation Effects; 19; 1973
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    On some annealing characteristics of heavy ion tracks in silicate minerals (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Heavy ion tracks in silicate minerals, using thermal annealing to identify origins
    Keywords: NUCLEAR ENGINEERING
    Type: INTERNATIONAL TOPICAL CONFERENCE ON NUCLEAR TRACK REGISTRATION IN INSULATING SOLIDS AND APPLICATIONS; May 01, 1969; CLERMONT-FERRAND, PUY-DE DOME; FRANCE|; VUE SCIENTIFIQUE ET
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Track formation mechanisms in minerals (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Heavy ion track registration in nonconductor minerals, discussing radiation damage and atomic species along trajectory
    Keywords: NUCLEAR ENGINEERING
    Type: INTERNATIONAL TOPICAL CONFERENCE ON NUCLEAR TRACK REGISTRATION IN INSULATING SOLIDS AND APPLICATIONS; May 01, 1969; CLERMONT-FERRAND, PUY-DE DOME; FRANCE|; VUE SCIENTIFIQUE ET
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Solid State Studies of the Radiation Histosy of Lunar Samples (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-08-24
    Description: Particle track densities up to greater than 3 x 10(exp 9) per square centimeter have been measured in different samples. Rocks 17, 47, 57, and 58 have VH (Z greater than 22) galactic cosmic ray ages of 11, 14, 28, and 13 x 10(exp 6) years, respectively. Rock 57 has a calculated erosion rate of approximately less than 10(exp -7) centimeter per year. Near-surface track versus depth data in rock 17 can be fit with solar flare particles that have a differential energy spectrum alpha E(exp -s); lunar samples can be used to study the history of solar activity. The uranium in the crystalline rocks occurs principally in small regions less than 10 to approximately equal to 100 micrometers in size. The (low) thermoluminescence of the fines increases with depth in core 10004. With one possible exception, x-ray studies have not shown pronounced radiation damage effects. The total energy release upon heating is small up to 900 C and occurs in three broad regions.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Science; 167; 3918; 563-566
    Format: text
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    NASA TECHNICAL REPORTS
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