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  • 1
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    Broadband seismic observation at the Sakurajima volcano, Japan (1992)
    In:  Geophys. Res. Lett., Amsterdam, Univ. Tokyo, vol. 19, no. 3, pp. 1959-1962, pp. L14309, (ISSN: 1340-4202)
    Details
    Publication Date: 1992
    Keywords: Seismology ; Broad-band ; Volcanology ; GRL
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Fractal analysis of fault systems in Japan and the Philippines (1992)
    In:  Geophys. Res. Lett., Bonn, 3-4, vol. 19, no. 7, pp. 357-360, pp. B01401, (ISSN: 1340-4202)
    Details
    Publication Date: 1992
    Keywords: Geol. aspects ; FractureT ; Tectonics ; GRL
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Normal fault earthquake off the Northern Mozambique: A possible isotropic source (1991)
    In:  Geophys. Res. Lett., Tokyo Univ., Geophys. Inst., Fac. of Science, vol. 18, no. 2, pp. 1381-1384, pp. L07312, (ISSN 0343-5164)
    Details
    Publication Date: 1991
    Keywords: Source ; Seismology ; Fault plane solution, focal mechanism ; GRL
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Three-dimensional instabilities of mantle convection with multiple phase transitions (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The effects of multiple phase transitions on mantle convection are investigated by numerical simulations that are based on three-dimensional models. These simulations show that cold sheets of mantle material collide at junctions, merge, and form a strong downflow that is stopped temporarily by the transition zone. The accumulated cold material gives rise to a strong gravitational instability that causes the cold mass to sink rapidly into the lower mantle. This process promotes a massive exchange between the lower and upper mantles and triggers a global instability in the adjacent plume system. This mechanism may be cyclic in nature and may be linked to the generation of superplumes.
    Keywords: GEOPHYSICS
    Type: Science (ISSN 0036-8075); 259; 5099; p. 1308-1311.
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    NASA TECHNICAL REPORTS
  • 5
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    Cosmic-ray-produced iron 60 in odessa meteorite. (1965)
    In:  Other Sources
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    Publication Date: 2011-08-10
    Description: Cosmic ray produced iron 60 measurement in Odessa meteorite by counting daughter radionuclide cobalt 60, noting dating application
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
  • 6
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    Small image laser range finder for planetary rover (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A variety of technical subjects need to be solved before planetary rover navigation could be a part of future missions. The sensors which will perceive terrain environment around the rover will require critical development efforts. The image laser range finder (ILRF) discussed here is one of the candidate sensors because of its advantage in providing range data required for its navigation. The authors developed a new compact-sized ILRF which is a quarter of the size of conventional ones. Instead of the current two directional scanning system which is comprised of nodding and polygon mirrors, the new ILRF is equipped with the new concept of a direct polygon mirror driving system, which successfully made its size compact to accommodate the design requirements. The paper reports on the design concept and preliminary technical specifications established in the current development phase.
    Keywords: LASERS AND MASERS
    Type: JPL, Third International Symposium on Artificial Intelligence, Robotics, and Automation for Space 1994; p 201-204
    Format: application/pdf
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  • 7
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    Wear characteristics of bonded solid film lubricant under high load condition (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Wear properties of phenolic resin bonded molybdenum disulfide film lubricant were studied. In-vacuo journal bearing tests were performed to evaluate the wear-life of this film lubricant. The wear-life depends on substrate materials and on sliding velocity. Pretreated substrate surfaces were examined to reveal the reasons for these results. Additionally, investigations on film wear mechanisms were made.
    Keywords: MECHANICAL ENGINEERING
    Type: JPL, The 25th Aerospace Mechanisms Symposium; p 179-193
    Format: application/pdf
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  • 8
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    Exposure ages of carbonaceous chondrites, 1 (1993)
    In:  Other Sources
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    Publication Date: 2013-08-29
    Description: The recent exposure histories of carbonaceous chondrites have been investigated using cosmogenic radionuclides. Our results may indicate a clustering of exposure ages of C1 and C2 chondrites into two peaks, 0.2 My and 0.6 My, perhaps implying two collisional events of Earth-crossing parent bodies. Among carbonaceous chondrites are some having short exposure ages which Mazor et al. hypothesized cluster into a small number of families. This hypothesis is based on spallogenic Ne-21 exposure ages, which in some instances are difficult to determine owing to the large amounts of trapped noble gases in carbonaceous chondrites. Also, since Ne-21 is stable, it integrates a sample's entire exposure history, so meteorites with complex exposure histories are difficult to understand using exclusively Ne-21. Cosmogenic radionuclides provide an alternative means of determining the recent cosmic ray exposure duration. To test the hypothesis of Mazor et al. we have begun a systematic investigation of exposure histories of Antarctic and non-Antarctic carbonaceous chondrites especially C2s.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z; p 1085-1086
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Development of diapiric structures in the upper mantle due to phase transitions (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Solid-state phase transition in time-dependent mantle convection can induce diapiric flows in the upper mantle. When a deep mantle plume rises toward phase boundaries in the upper mantle, the changes in the local thermal buoyancy, local heat capacity, and latent heat associated with the phase change at a depth of 670 kilometers tend to pinch off the plume head from the feeding stem and form a diapir. This mechanism may explain episodic hot spot volcanism. The nature of the multiple phase boundaries at the boundary between the upper and lower mantle may control the fate of deep mantle plumes, allowing hot plumes to go through and retarding the tepid ones.
    Keywords: GEOPHYSICS
    Type: Science (ISSN 0036-8075); 252; 1836-183
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  • 10
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    Solar helium and neon in the Earth (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Neon isotopic compositions in mantle-derived samples commonly are enriched in (20)Ne and (21)Ne relative to (22)Ne compared with atmospheric neon ((20)Ne/(22)Ne and (21)Ne/(22)Ne ratios in atmospheric neon are 9.8 and 0.029, respectively), together with significant primordial (3)He. Such results have been obtained on MORB's, intraplate plume-related oceanic island basalts, backarc basin basalts, mantle xenoliths, ancient diamonds and CO2 well gases (e.g., 1 - 8). The highest (20)Ne/(22)Ne ratio observed in MORB glasses (= 13.6 plus or minus 1.3 is close to the solar value (= 13.6, as observed in solar wind). In order to explain the enrichment of (20)Ne and (21)Ne relative to atmospheric neon for samples derived from the mantle, it is necessary to postulate the presence of at least two distinct non-atmospheric components. The two most likely candidates are solar and nucleogenic ((20)Ne/(22)Ne solar = 13.6 (21)Ne/(22)Ne solar = 0.032, (20)Ne/(22)Ne nucleogenic = 2.5 and (21)Ne/(22)Ne nucleogenic = 32). This is because solar neon is the only known component with a (20)Ne/(22)Ne ratio greater than both the atmospheric value and that observed in samples derived from the mantle. Nucleogenic neon is well known to elevate (21)Ne/(22)Ne ratios. Neon isotopic signatures observed in mantle-derived samples can be accounted for by mixing of the three neon end members: solar, nucleogenic and atmospheric.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., Conference on Deep Earth and Planetary Volatiles; p 16
    Format: text
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