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  • 550 - Earth sciences  (2,734)
  • SPACE SCIENCES  (1,737)
  • FLUID MECHANICS AND HEAT TRANSFER
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  • 1
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    Extreme radiation damage in soil from Mare Fecunditatis. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: High-voltage electron microscopy has been used to compare radiation effects in micron-size soil grains from the Luna 16 site (Mare Fecunditatis) and the four Apollo landing sites. Radiation damage by heavy solar particles is strikingly greater in the Luna 16 sample than in the other four samples. It is suggested that less movement of the soil at Mare Fecunditatis has taken place, perhaps because of its proximity to the limb and consequent lower exposure to energetic electrons in the earth's magnetospheric tail, which would cause electrostatic agitation of fine particles.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 13; Jan. 197
    Format: text
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  • 2
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    The planetary magnetic field and magnetosphere of Jupiter - Pioneer 10 (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Data obtained by the Pioneer 10 vector helium magnetometer are presented along with models of the intrinsic magnetic field of Jupiter and its magnetosphere. Data acquired between 2.84 and 6.0 Jupiter radii, where the intensity of the planetary field ranged between 1900 and 18,400 gamma, were used to develop a six-parameter eccentric dipole model of the field. The dipole so derived has a moment of 4.0 G (R sub J) cubed and a tilt angle with respect to Jupiter's rotation axis of 11 deg. A model of the Jovian magnetosphere is presented in which the essential feature is an eastward current sheet that forms an annulus with Jupiter at the center. At large distances from the planet the current sheet is nearly parallel to Jupiter's equator but, in general, does not lie in it. The current sheet is warped, so that it is above the equator on one side and below it on the other. The current sheet rotates with the planet, more or less like a rigid body, this behavior causes an apparent up and down motion and periodic crossings of the current sheet by Pioneer.
    Keywords: SPACE SCIENCES
    Type: Journal of Geophysical Research; 79; Sept. 1
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  • 3
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    A combined Eulerian-volume of fraction-Lagrangian method for atomization simulation (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The tracking of free surfaces between liquid and gas phases and analysis of the interfacial phenomena between the two during the atomization and breakup process of a liquid fuel jet is modeled. Numerical modeling of liquid-jet atomization requires the resolution of different conservation equations. Detailed formulation and validation are presented for the confined dam broken problem, the water surface problem, the single droplet problem, a jet breakup problem, and the liquid column instability problem.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-193985 , NAS 1.26:193985
    Format: application/pdf
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  • 4
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    Magnetic field of Jupiter and its interaction with the solar wind (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Jupiter's magnetic field and its interaction with the magnetized solar wind were observed with the Pioneer 10 vector helium magnetometer. The magnetic dipole is directed opposite to that of the earth with an inclination of 15 deg lying in a system III meridian of 230 deg. The dipole is offset about 0.1 Jupiter radius north of the equatorial plane and about 0.2 Jupiter radius toward longitude 170 deg. There is severe stretching of the planetary field parallel to the equator throughout the outer magnetosphere, accompanied by a systematic departure from meridian planes. The field configuration implies substantial plasma effects inside the magnetosphere, such as thermal pressure, centrifugal forces, and differential rotation.
    Keywords: SPACE SCIENCES
    Type: Science; 183; Jan. 25
    Format: text
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  • 5
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    Radiation damage in Luna 20 soil. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: As an extension of previous studies of radiation damage produced by heavy solar flare ions in lunar soils, high-voltage electron microscopy and electron diffraction procedures were used to rank a Luna 20 sample among the other soils returned by Soviet and American lunar missions. Micron-sized soil grains from the Luna 20 mission are the most lightly irradiated, in contrast to micron-sized grains from Luna 16 soil, which are the most heavily irradiated.
    Keywords: SPACE SCIENCES
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  • 6
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    Radiation effects in soils from five lunar missions. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Optical and high-voltage electron microscopy were used to study radiation-produced defects. There is no systematic decrease in solar flare track distributions in lunar fines even to a depth of 2.5 m. The soil gradually accumulates in thickness; stirring by impacts is usually on a small scale. The accumulation rate at Luna 16 site is far lower than at the Apollo sites; the mean track density in micron-size grains there exceeds one trillion per sq cm; more than 90% of those grains are metamict; the Luna 16 site is at high longitude where electrostatic charging and transport of soil by geomagnetic tail electrons are minimal. A large fraction of soil grains on sloping ground have been isotropically irradiated, suggesting a tumbling downhill motion.-
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Jan 10, 1972 - Jan 13, 1972; Houston, TX
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  • 7
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    Turbulence models for compressible boundary layers (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: It is shown that to satisfy the general accepted compressible law of the wall derived from the Van Driest transformation, turbulence modeling coefficients must actually be functions of density gradients. The transformed velocity profiles obtained by using standard turbulence model constants have too small a value of the effective von Karman constant kappa in the log-law region (inner layer). Thus, if the model is otherwise accurate, the wake component is overpredicted and the predicted skin friction is lower than the expected value.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA Journal (ISSN 0001-1452); 32; 4; p. 735-740
    Format: text
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  • 8
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    X-ray fluorescence experiment (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The preliminary results from the Sco X-1 and Cyg X-1 obtained from the Apollo 15 X-ray detector data are presented along with preliminary results of the X-ray fluorescence spectrometric data of the lunar surface composition. The production of the characteristic X-rays following the interaction of solar X-rays with the lunar surface is described along with the X-ray spectrometer. Preliminary analyses of the astronomical X-ray observation and the X-ray fluorescence data are presented.
    Keywords: SPACE SCIENCES
    Type: Apollo 15 Prelim. Sci. Rept.; 17 p
    Format: text
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  • 9
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    S-band transponder experiment (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Apollo 14 command service and lunar module orbital velocity data from radio navigation S-band transponder experiment for lunar gravitation effects
    Keywords: SPACE SCIENCES
    Type: NASA. MANNED SPACECRAFT CENTER APOLLO 14 PRELIM. SCI. REPT. 1971; P 253-256
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  • 10
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    Lunar portable magnetometer experiment (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Lunar portable magnetometer experiment to measure steady magnetic field at different sites in Fra Mauro region - Apollo 14 flight
    Keywords: SPACE SCIENCES
    Type: APOLLO 14 PRELIM. SCI. REPT. 1971; P 227-237
    Format: text
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