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  • 1
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    A re-investigation of the 'double dawn' event recorded in the Bamboo Annals (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: An allusion to a 'double dawn' phenomenon in an ancient Chinese chronicle, which has been identified as caused by a sunrise eclipse occurring in 899 BC, is discussed. This event has been regarded as of considerable importance in the investigation of earth's past rotation. It is shown that an eclipse interpretation is implausible, not least because the eclipse in question was only annular.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: Royal Astronomical Society, Quarterly Journal (ISSN 0035-8738); 33; 2, Ju; 91-98
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  • 2
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    LIFES: Laser Induced Fluorescence and Environmental Sensing (1975)
    In:  CASI
    Details
    Publication Date: 2009-11-16
    Description: A laboratory investigation has been conducted to evaluate the detection and identification capabilities of laser induced fluorescence as a remote sensing technique for the marine environment. The relative merits of fluorescence parameters including emission and excitation profiles, intensity and lifetime measurements are discussed in relation to the identification of specific targets of the marine environment including crude oils, refined petroleum products, fish oils and algae. Temporal profiles displaying the variation of lifetime with emission wavelength have proven to add a new dimension of specificity and simplicity to the technique.
    Keywords: LASERS AND MASERS
    Type: NASA. Wallops Station The Use of Lasers for Hydrographic Studies; p 153-169
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  • 3
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    Quality factors for degraded proton spectra (1965)
    In:  CASI
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    Publication Date: 2006-10-26
    Description: Quality factors for degraded proton spectra from ratio of dose equivalent to absorbed dose - radiation dose measurements in skin
    Keywords: BIOSCIENCES
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  • 4
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    Picosecond coherent anti-Stokes Raman scattering (CARS) study of vibrational dephasing of carbon disulfide and benzene in solution (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The vibrational dephasing of the 656/cm mode (nu1, a1g) of CS2 and the 991/cm mode (nu2, a1g) of benzene have been studied as a function of concentration in mixtures with a number of solvents using a ps time-resolved CARS technique. This technique employs two tunable synchronously-pumped mode-locked dye lasers in a stimulated Raman pump, coherent anti-Stokes Raman probe time-resolved experiment. Results are obtained for CS2 in carbon tetrachloride, benzene, nitrobenzene, and ethanol and for benzene nu2 in CS2. The dephasing rates of CS2 nu1 increase on dilution with the polar solvents and decrease or remain constant on dilution with the nonpolar solvents. The CS2/benzene solutions show a contrasting behavior, with the CS2 nu1 dephasing rate being nearly independent of concentration whereas the benzene nu2 dephasing rate decreases on dilution. These results are compared to theoretical models for vibrational dephasing of polyatomic molecules in solution.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
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  • 5
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    The Galileo Attitude and Articulation Control System - A radiation-hard, high precision, state-of-the-art control system (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The Galileo Mission and Spacecraft design impose tight requirements on the Attitude and Articulation Control System (AACS). These requirements, coupled with the flexible spacecraft, the need for autonomy, and a severe radiation environment, pose a great challenge for the AACS designer. The resulting design and implementation are described, along with the discovery and solution of the Single-Event Upset problem. The status of the testing of the AACS in the Integration and Test Laboratory as well as at the spacecraft level is summarized.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
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  • 6
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    Changes in the earth's rate of rotation between A.D. 1672 and 1806 as deduced from solar eclipse timings (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Solar eclipse timings measured between A.D. 1672 and 1806 are analyzed to study the variation of Delta T (= ET - UT) over this interval. These solar eclipse observations confirm the results of Brouwer (1952), Martin (1969), and Stephenson and Morrison (1969) which were obtained from the analysis of occultations in this period. It is believed that Goldstein's (1985) analysis inadequately represents the changes in Delta T.
    Keywords: GEOPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 200; 1-2,
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  • 7
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    The Galileo attitude and articulation control system - A radiation-hard, high precision, state-of-the-art control system (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The Galileo mission and spacecraft, consisting of a Jupiter-orbiter and an atmospheric entry probe, are discussed. Components will include: magnetometers and plasma-wave antennas on a boom, high-gain antenna, probe vehicle, two different bus electronics packages, and a radioisotope thermoelectric generator. Instruments, investigators and objectives are tabulated for both probe science and orbiter science investigations. Requirements in the design of the attitude and articulation control system are very stringent because of the complex dynamics, flexible body effects, the need for autonomy, and the severe radiation environment in the Jupiter nighborhood. Galileo was intended to be ready for launch via Space Shuttle in May of 1986.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
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  • 8
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    ALSEP data management. (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Nine million measurements a day are transmitted from each functional ALSEP on the moon and continuously collected on earth for use in long-term scientific analysis. Periodically, this massive flow of intricate data is examined on a real-time basis to evaluate ALSEP performance and to study the need for new commands to any of the ALSEP systems. A worldwide complex of facilities and personnel has the challenging task of efficient and timely data processing and dissemination. This paper describes facility characteristics and support activities and details certain constraints imposed on ALSEP hardware design by data handling requirements. The highlights of the first two years of lunar data management are reviewed.
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: Bendix Technical Journal; 4; Summer-A
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  • 9
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    Observed velocity fluctuations on a major Antarctic ice stream (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Recent ice velocity measurements on the major Antarctic Ice Stream B are compared with those collected 10 years ago. The results show that the ice flow in the mouth of Ice Stream B has decelerated by about 20 percent. The possible causes of this deceleration are discussed on the basis of present knowledge of current regional dynamics, and the possible effects of this deceleration on future ice stream behavior are examined.
    Keywords: GEOPHYSICS
    Type: Nature (ISSN 0028-0836); 334; 695-697
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  • 10
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    Earthbased tracking and orbit determination - Backbone of the planetary navigation system (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Deep Space Network /DSN/ data accuracy limitations relation with ability to determine orbit of probe, examining improvements after Mariner 2 and trends
    Keywords: NAVIGATION
    Type: ; ACE(
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