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  • Other Sources  (109)
  • SPACE SCIENCES  (33)
  • Aerospace Medicine  (32)
  • Geophysics  (25)
  • ATOMIC AND MOLECULAR PHYSICS  (19)
  • 11
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    The pressure broadening of NO2 in the millimeter and submillimeter wave spectral region (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Pressure-broadening parameters for 19 transitions of the millimeter and submillimeter wave spectrum of NO2 have been obtained experimentally. Results for broadening by N2, O2, and He are presented and compared with earlier theoretical calculations of the N2 and O2 parameters. A discussion of the relation between theoretical calculations and experimental measurements is presented.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073); 43; 365-369
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  • 12
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    Lunar lava tube radiation safety analysis (2002)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: For many years it has been suggested that lava tubes on the Moon could provide an ideal location for a manned lunar base, by providing shelter from various natural hazards, such as cosmic radiation, meteorites, micrometeoroids, and impact crater ejecta, and also providing a natural environmental control, with a nearly constant temperature, unlike that of the lunar surface showing extreme variation in its diurnal cycle. An analysis of radiation safety issues on lunar lava tubes has been performed by considering radiation from galactic cosmic rays (GCR) and Solar Particle Events (SPE) interacting with the lunar surface, modeled as a regolith layer and rock. The chemical composition has been chosen as typical of the lunar regions where the largest number of lava tube candidates are found. Particles have been transported all through the regolith and the rock, and received particles flux and doses have been calculated. The radiation safety of lunar lava tubes environments has been demonstrated.
    Keywords: Aerospace Medicine
    Type: Journal of radiation research (ISSN 0449-3060); Volume 43 Suppl; S41-5
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  • 13
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    Implementation of Gy-Eq for deterministic effects limitation in shield design (2002)
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    Publication Date: 2011-08-24
    Description: The NCRP has recently defined RBE values and a new quantity (Gy-Eq) for use in estimation of deterministic effects in space shielding and operations. The NCRP's RBE for neutrons is left ambiguous and not fully defined. In the present report we will suggest a complete definition of neutron RBE consistent with the NCRP recommendations and evaluate attenuation properties of deterministic effects (Gy-Eq) in comparison with other dosimetric quantities.
    Keywords: Aerospace Medicine
    Type: Journal of radiation research (ISSN 0449-3060); Volume 43 Suppl; S103-6
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  • 14
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    Advances in space radiation shielding codes (2002)
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    Publication Date: 2011-08-24
    Description: Early space radiation shield code development relied on Monte Carlo methods and made important contributions to the space program. Monte Carlo methods have resorted to restricted one-dimensional problems leading to imperfect representation of appropriate boundary conditions. Even so, intensive computational requirements resulted and shield evaluation was made near the end of the design process. Resolving shielding issues usually had a negative impact on the design. Improved spacecraft shield design requires early entry of radiation constraints into the design process to maximize performance and minimize costs. As a result, we have been investigating high-speed computational procedures to allow shield analysis from the preliminary concept to the final design. For the last few decades, we have pursued deterministic solutions of the Boltzmann equation allowing field mapping within the International Space Station (ISS) in tens of minutes using standard Finite Element Method (FEM) geometry common to engineering design methods. A single ray trace in such geometry requires 14 milliseconds and limits application of Monte Carlo methods to such engineering models. A potential means of improving the Monte Carlo efficiency in coupling to spacecraft geometry is given.
    Keywords: Aerospace Medicine
    Type: Journal of radiation research (ISSN 0449-3060); Volume 43 Suppl; S87-91
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  • 15
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    Overview of atmospheric ionizing radiation (AIR) research: SST-present (2003)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The Supersonic Transport (SST) program, proposed in 1961, first raised concern for the exposure of pregnant occupants by solar energetic particles (SEP), and neutrons were suspected to have a main role in particle propagation deep into the atmosphere. An eight-year flight program confirmed the role of SEP as a significant hazard and of the neutrons as contributing over half of the galactic cosmic ray exposures, with the largest contribution from neutrons above 10 MeV. The FAA Advisory Committee on the Radiobiological Aspects of the SST provided operational requirements. The more recent lowering of ICRP-recommended exposure limits (1990) with the classification of aircrew as "radiation workers" renewed interest in GCR background exposures at commercial flight altitudes and stimulated epidemiological studies in Europe, Japan, Canada and the USA. The proposed development of a High Speed Civil Transport (HSCT) required validation of the role of high-energy neutrons, and this resulted in ER-2 flights at solar minimum (June 1997) and studies on effects of aircraft materials on interior exposures. Recent evaluation of health outcomes of DOE nuclear workers resulted in legislation for health compensation in year 2000 and recent European aircrew epidemiological studies of health outcomes bring renewed interest in aircraft radiation exposures. As improved radiation models become available, it is imperative that a corresponding epidemiological program of US aircrew be implemented. Published by Elsevier Ltd on behalf of COSPAR.
    Keywords: Aerospace Medicine
    Type: Advances in space research : the official journal of the Committee on Space Research (COSPAR); Volume 32; 1; 3-16
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  • 16
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    Can solid hydrogen condense on interstellar grains? (1969)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Solid hydrogen condensation on interstellar grain surfaces at extremely low temperatures related to H atoms density
    Keywords: SPACE SCIENCES
    Type: ; TROPHYSICAL JOURNAL
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  • 17
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    Magnet experiment - Electromagnetic properties of the lunar surface. (1968)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Magnetic experiment on Surveyor 5 revealing magnetic material presence in Mare Tranquillitatis, discussing analogy to powdered basalt
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
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  • 18
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    The runaway greenhouse and the accumulation of CO2 in the Venus atmosphere (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Venus atmosphere and surface conditions, describing temperature, accumulation of carbon dioxide and runaway greenhouse effect
    Keywords: SPACE SCIENCES
    Type: ; 17 (
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  • 19
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    Mariner 9 areographic coordinate system. (1973)
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    Publication Date: 2011-08-16
    Description: The basic elements of the physical ephemeris of Mars are reexamined, and the new values adopted for the Mariner 9 mapping are specified, in particular, for the direction of the spin axis and the first meridian.
    Keywords: SPACE SCIENCES
    Type: Journal of Geophysical Research; 78; July 10
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  • 20
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    Permafrost features on the Martian surface. (1968)
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    Publication Date: 2011-08-12
    Description: Permafrost features on Martian surface, discussing patterning process
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
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