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  • Other Sources  (5)
  • Inorganic, Organic and Physical Chemistry  (3)
  • CC 4  (2)
  • 2000-2004  (5)
  • 1965-1969
  • 1955-1959
  • 2003  (1)
  • 2001  (4)
  • 1
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    Tropical climate changes at millennial and orbital timescales on the Bolivian Altiplano (2001)
    In:  Nature, pp. 698-701, vol. 409
    Details
    Publication Date: 2001
    Keywords: CC 4 ; Coordinating Committee ; Continental Drilling ; ICDP
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    BIBLIOGRAPHY ILP
  • 2
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    The history of South American tropical precipitation for the past 25,000 years (2001)
    In:  Science, pp. 640-643, vol. 291
    Details
    Publication Date: 2001
    Keywords: CC 4 ; Coordinating Committee ; Continental Drilling ; ICDP
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    BIBLIOGRAPHY ILP
  • 3
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    Holographic Interferometry and Laminar Jet Diffusion Flames in the Presence of Non-Uniform Magnetic Fields (2001)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Magnetic fields impact combustion processes in a manner analogous to that of buoyancy, i.e., as a body force. It is well known that in a terrestrial environment buoyancy is one of the principal transport mechanisms associated with diffusion flame behavior. Unfortunately, in a terrestrial environment it is difficult if not impossible to isolate flame behavior due magnetic fields from the behavior associated with buoyancy. A micro-, or reduced, gravity environment is ideally suited for studying the impact of magnetic fields on diffusion flames due to the decreased impact of buoyancy on flame behavior.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: Sixth International Microgravity Combustion Workshop; 361-364; NASA/CP-2001-210826
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    NASA TECHNICAL REPORTS
  • 4
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    An Analytical Model for Non-Uniform Magnetic Field Effects on Two-Dimensional Laminar Jet Diffusion Flames (2001)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: In 1846, Michael Faraday found that permanent magnets could cause candle flames to deform into equatorial disks. He believed that the change in flame shape was caused by the presence of charged particles within the flames interacting with the magnetic fields. Later researchers found that the interaction between the flame ions and the magnetic fields were much too small to cause the flame deflection. Through a force analysis, von Engel and Cozens showed that the change in the flame shape could be attributed to the diamagnetic flame gases in the paramagnetic atmosphere. Paramagnetism occurs in materials composed of atoms with permanent magnetic dipole moments. In the presence of magnetic field gradients, the atoms align with the magnetic field and are drawn into the direction of increasing magnetic field. Diamagnetism occurs when atoms have no net magnetic dipole moment. In the presence of magnetic gradient fields, diamagnetic substances are repelled towards areas of decreasing magnetism. Oxygen is an example of a paramagnetic substance. Nitrogen, carbon monoxide and dioxide, and most hydrocarbon fuels are examples of diamagnetic substances. In order to evaluate the usefulness of these magnets in altering flame behavior, a study has been undertaken to develop an analytical model to describe the change in the flame length of a laminar diffusion jet in the presence of a nonuniform magnetic field.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: Sixth International Microgravity Combustion Workshop; 381-384; NASA/CP-2001-210826
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Evaporation Rate Study and NDMA Formation from UDMH/NO2 Reaction Products (2003)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Laboratory samples of uns-dimethylhydrazine (UDMH) fuel/oxidizer (nitrogen dioxide) non-combustion reaction products (UFORP) were prepared using a unique permeation tube technology. Also, a synthetic UFORP was prepared from UDMH, N-nitrosodimethylamine (NDMA), dimethylammonium nitrate, sodium nitrite and purified water. The evaporation rate of UFORP and synthetic UFORP was determined under space vacuum (approx 10(exp -3) Torr) at -40 ?C and 0 ?C. The material remaining was analyzed and showed that the UFORP weight and NDMA concentration decreased over time; however, NDMA had not completely evaporated. Over 85% of the weight was removed by subjecting the UFORP to 10(-3) Torr for 7 hours at -40 ?C and 4 hours at 0 ?C. A mixture of dimethylammonium nitrate and sodium nitrite formed NDMA at a rapid rate in a moist air environment. A sample of UFORP residue was analyzed for formation of NDMA under various conditions. It was found that NDMA was not formed unless nitrite was added.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: JSC-CN-2366 , 20th JANNAF Safety and Environmental Protections Subcommittee (S and EPS) Joint Meeting; Mar 24, 2003 - Mar 27, 2003; Charlottesville, VA; United States|31st JANNAF Propellant Development and Characterization Subcommittee (PDCS) Joint Meeting; Mar 24, 2003 - Mar 27, 2003; Charlottesville, VA; United States
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    NASA TECHNICAL REPORTS
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