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  • Weitere Quellen  (55)
  • NASA Technical Reports  (55)
  • 2005-2009  (6)
  • 2000-2004  (1)
  • 1985-1989  (16)
  • 1980-1984  (12)
  • 1970-1974  (16)
  • 1945-1949  (4)
  • 1
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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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    Publikationsdatum: 2011-08-19
    Beschreibung: 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.
    Schlagwort(e): CHEMISTRY AND MATERIALS (GENERAL)
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  • 2
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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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    Publikationsdatum: 2011-08-19
    Beschreibung: 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.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
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  • 3
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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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    Publikationsdatum: 2011-08-19
    Beschreibung: 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.
    Schlagwort(e): GEOPHYSICS
    Materialart: Astronomy and Astrophysics (ISSN 0004-6361); 200; 1-2,
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  • 4
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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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    Publikationsdatum: 2011-08-19
    Beschreibung: 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.
    Schlagwort(e): SPACECRAFT DESIGN, TESTING AND PERFORMANCE
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  • 5
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    ALSEP data management. (1971)
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    Publikationsdatum: 2011-08-16
    Beschreibung: 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.
    Schlagwort(e): FACILITIES, RESEARCH, AND SUPPORT
    Materialart: Bendix Technical Journal; 4; Summer-A
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  • 6
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    Observed velocity fluctuations on a major Antarctic ice stream (1988)
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    Publikationsdatum: 2011-08-19
    Beschreibung: 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.
    Schlagwort(e): GEOPHYSICS
    Materialart: Nature (ISSN 0028-0836); 334; 695-697
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  • 7
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    Earthbased tracking and orbit determination - Backbone of the planetary navigation system (1970)
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    Publikationsdatum: 2011-08-16
    Beschreibung: Deep Space Network /DSN/ data accuracy limitations relation with ability to determine orbit of probe, examining improvements after Mariner 2 and trends
    Schlagwort(e): NAVIGATION
    Materialart: ; ACE(
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  • 8
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    The design of a microstrip antenna array for a UHF space telemetry link (1981)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: An array of microstrip antenna panels was designed for use on a small instrumented satellite as part of a 400-MHz telemetry link between that satellite and NASA's shuttle spacecraft. A roughly omnidirectional phi-plane pattern was desired. The 1.4-wavelength diameter of the satellite and the various ports and structures on its surface presented strong constraints on the antenna array design. Eight antennas, each one a quarter-wavelength panel with one radiating and one shorted edge, were chosen. A phi-plane pattern ripple of 4.4 dB and a gain of at least 0.1 dB relative to a half-wavelength dipole were realized. The design technique used for the individual antenna panels included the study of feed-point location for impedance matching and the effect of losses in the dielectric. A superposition method was used to synthesize the radiation patterns for different numbers and different excitations of antennas on the satellite.
    Schlagwort(e): SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Materialart: IEEE Transactions on Antennas and Propagation; AP-29; Jan. 198
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  • 9
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    On the location of acid-hydrolysable carbon in lunar soil fines (1982)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Soil fines exposed on the lunar surface accumulate small metallic iron particles and solar wind-derived carbon. In previous work, it has been suggested that an intimate association exists between one particular carbon phase, hydrolysable carbon, and very fine iron droplets, where the carbon is in solid solution in the iron. The earlier hypothesis of a constant carbon in iron concentration across a broad range of droplet sizes is testable by combining hydrolysable carbon determinations with a variety of magnetic measurements sensitive to different droplet diameters. New measurements of ferromagnetic resonance response on density and magnetic separates from size fractions of soil 12023 are interpreted as evidence that hydrolysable carbon is preferentially associated with the larger, magnetically stable single-domain iron particles rather than with the smaller superparamagnetic droplets. For the former, there is a quite uniform ratio of iron to carbon both within a series of separates from a single soil, and among soils of widely varying FeO content.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Earth and Planetary Science Letters; 59; 1, Ju; June 198
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  • 10
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    Analysis of forest structure using thematic mapper simulator data (1986)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: The potential of Thematic Mapper Simulator (TMS) data for sensing forest structure information has been explored by principal components and feature selection techniques. In a survey of forest structural properties conducted for 123 field sites of the Sequoia National Park, the canopy closure could be well estimated (r = 0.62 to 0.69) by a variety of channel bands and band ratios, without reference to the forest type. Estimation of the basal area was less successful (r = 0.51 or less) on the average, but could be improved for certain forest types when data were stratified by floristic composition. To achieve such a stratification, individual sites were ordinated by a detrended correspondence analysis based on the canopy of dominant species. The analysis of forest structure in the Sequoia data suggests that total basal area can be best predicted in stands of lower density, and in younger even-aged managed stands.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-24; 113-121
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