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  • 1
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    Static properties of a non-neutral Be-9(+)-ion plasma (1988)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: The paper reports measurements of the static properties of laser-cooled nonneutral Be-9(+)-ion plasmas stored in Penning traps (PT) under a variety of experimental conditions. The shape, rotation frequency, density, and temperature of the ions were measured as functions of the PT potential and laser-cooling configuration. Within experimental error, the ion plasmas rotate without shear and exhibit approximate thermal equilibrium.
    Schlagwort(e): PLASMA PHYSICS
    Materialart: Physical Review A - General Physics, 3rd Series (ISSN 0556-2791); 38; 859-873
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  • 2
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    Multi Band Gap High Efficiency Converter (Rainbow) (1997)
    In:  Other Sources
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    Publikationsdatum: 2018-06-08
    Beschreibung: This papter reprots on the reexamination of the spectrally split, individually matched cell approach using modern-day optics and lightweight structures.
    Format: text
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  • 3
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    HCN production from Comet Halley (1986)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: Observations of the HCN J=1-0 rotational transition at 3.4 mm wavelength in comet P/Halley with a 14m antenna were obtained during 56 individual observing sessions between Nov. 1985 and May 1986. The HCN production rate is well correlated with the total visual magnitude of the comet, indicating that HCN follows the overall gas and dust production. However, comparison of HCN production to the total gas production of the comet indicates that it is a relatively minor consitiuent with 0.1% of the abundance of H2O. Spectra obtained by binning the HCN data with heliocentric distance show that the HCN line width, and thus the parent outflow velocity, increases with decreasing heliocentric distance, and that there is a tendency for the lines to be blue shifted as expected from the observed anisotropic outgassing from the nucleus. There is evidence of day-to-day time variability in the total HCN emission and variations in the HCN hyperfine ratios from their LTE values.
    Schlagwort(e): ASTROPHYSICS
    Materialart: ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas; p 577-581
    Format: text
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  • 4
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    Loss of Alkali Oxide From Beta Alumina and its Importance to AMTEC Life Issues (1997)
    In:  Other Sources
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    Publikationsdatum: 2018-06-08
    Beschreibung: Loss of sodium oxide into a gas phase comprises of low to high pressure sodium at typical AMTEC operating conditions does not seem indicated as a life limiting step under projected conditions.
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  • 5
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    Search for molecules in Comet Halley at millimeter wavelengths (1987)
    In:  Other Sources
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    Publikationsdatum: 2019-07-27
    Beschreibung: Data collected with the Five College Radio Astronomy Observatory 13.7-m radio telescope are used to search for the possible CN parent molecules HNC, HC3N, and CH3CN in Comet Halley at millimeter wavelengths. Maximum relative abundances for HNC/HCN of 0.3, for HC3N/HCN of 0.4, and for CH3CN/HCN of 0.8 are obtained, showing that these three molecules are not a major source of the CN radical observed in optical and UV spectroscopy. Upper limits to the beam averaged column densities and production rates of these molecules are determined (in addition to an upper limit for the beam averaged column density for the formyl ion of less than 10 to the 11th/sq cm), providing important constraints for chemical models of the coma.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Cometary radio astronomy; Sept. 24-26, 1986; Green Bank, WV; United States
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  • 6
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    Graphite-Fiber Heat Radiators (1995)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: Heat radiators of proposed type feature thermally conductive fibers protruding from metallic surfaces to provide increased heat-dissipation surface areas. Free of leaks and more reliable than radiators incorporating heat pipes. Also lightweight and relatively inexpensive. Radial graphite fibers carry heat away from spherical shell and radiate heat into space. Radiators prove useful on Earth in special industrial and scientific applications involving dissipation of heat in vacuum or in relatively still air.
    Schlagwort(e): PHYSICAL SCIENCES
    Materialart: NPO-19298 , NASA Tech Briefs (ISSN 0145-319X); 19; 12; P. 57
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  • 7
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    Observations of HCN in Comet Halley (1987)
    In:  Other Sources
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    Publikationsdatum: 2019-07-27
    Beschreibung: Observations of the HCN J = 1-0 rotational transition at 3.4 mm wavelength in comet P/Halley are discussed. The data were obtained during a total of 56 individual observing sessions between Nov. 18, 1985 and May 11, 1986, and represent the first time that a cometary parent molecule has been so extensively monitored. The HCN production rate is well correlated with the total visual magnitude of the comet, indicating that HCN follows the overall gas production. There is also evidence of time variability and variations in the HCN hyperfine ratios from their LTE values. Spectra obtained by binning the HCN data with heliocentric distance show that the HCN line width, and thus the parent outflow velocity, increases with decreasing heliocentric distance.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Cometary radio astronomy; Sept. 24-26, 1986; Green Bank, WV; United States
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  • 8
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    Laser furnace and method for zone refining of semiconductor wafers (1988)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-15
    Beschreibung: A method of zone refining a crystal wafer (116 FIG. 1) comprising the steps of focusing a laser beam to a small spot (120) of selectable size on the surface of the crystal wafer (116) to melt a spot on the crystal wafer, scanning the small laser beam spot back and forth across the surface of the crystal wafer (116) at a constant velocity, and moving the scanning laser beam across a predetermined zone of the surface of the crystal wafer (116) in a direction normal to the laser beam scanning direction and at a selectible velocity to melt and refine the entire crystal wafer (116).
    Schlagwort(e): Solid-State Physics
    Format: application/pdf
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  • 9
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    HCN production from comet Halley (1986)
    In:  Other Sources
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    Publikationsdatum: 2019-07-12
    Beschreibung: The HCN J = 1-0 rotational transition at 3.4 mm wavelength has been detected and has been monitored in comet P/Halley during a total of 56 individual observing sessions between November 18, 1985 and May 11, 1986. The HCN spectra show significant daily variations in total intensity, but the average HCN production rate is well correlated with the visual magnitude of the comet over the range of heliocentric distance observed (between 0.59 and 1.8). Observations of the ratios of the F = 2-1 and F = 1-1 hyperfine components also exhibit significant daily variations but are, in the mean, consistent with the 5:3 ratio expected from the statistical weights of the hyperfine levels. The outflow velocity of the coma, deduced from the HCN linewidths, is 0.87 + or - 0.12 km/s, which is consistent with recent theoretical estimates as well as the measurements of the Giotto spacecraft.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 310; L55-L60
    Format: text
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