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  • ASTROPHYSICS  (1.245)
  • INSTRUMENTATION AND PHOTOGRAPHY  (539)
  • 1980-1984  (1.043)
  • 1975-1979  (741)
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  • 11
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    The grains and gas in Comet Bowell 1980b (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The importance of coordinating different types of observations of a comet is illustrated in terms of spectral data on Comet Bowell. Photometric data in 1980 indicated that OH emissions were occurring when the comet was still more than 4 AU from the sun. Further measurements were arranged with the IUE satellite, the photoelectric scanner at Cerro Tololo and the IR telescope on Mauna Kea. Several sizes of diaphragms were used in order to estimate variations with respect to aperture. Calculations were made to quantify the wavelengths observed as a function of the grains' cross-sections. The OH emission was confirmed by the spectrographic and photometric data. It is suggested that sufficient dark materials are present on the cometary surface to have enhanced the absorption of solar radiation to levels sufficient for heating and dissociating surface ice particles.
    Schlagwort(e): ASTROPHYSICS
    Format: text
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  • 12
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    Comparing tiltmeters for crustal deformation measurement - A preliminary report (1984)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: Attention is given to 1.2 years of data from two Michelson-Gale long fluid tiltmeters, one long center pressure tiltmeter, and a shallow borehole tiltmeter, which have been in operation at Pinon Flat Observatory in Southern California. The most stable tilt record shows a secular rate of 0.28 microrad/a, which may be real. Comparisons undertaken among instruments have identified more and less successful measurement techniques. It is concluded that even the best existing sensors must be improved in order to measure continuous tectonic motions.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Geophysical Research Letters (ISSN 0094-8276); 11; 963-966
    Format: text
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  • 13
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    A simplified GPS C/A reciever front end with low noise performance (1984)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A redesign of the antenna electronics package for the NBS/GPS C/A receiver has resulted in significantly reduced cost and improved performance. Major improvements include a simplified and more reliable multiplier/mixer, elimination of all twelve piston trimmer tuning capacitors in the original design, elimination of expensive bandpass filters, less expensive antenna and a simplified packaging scheme.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: NASA. Goddard Space Flight Center Proc. of the 16th Ann. Precise Time and Time Interval (PTTI) Appl. and Planning Meeting; p 467-474
    Format: application/pdf
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  • 14
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    The micrometeoroid complex and evolution of the lunar regolith (1977)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Monte Carlo-based computer calculations, as well as analytical approaches utilizing probabilistic arguments, were applied to gain insight into the principal regolith impact processes and their resulting kinetics. Craters 10 to 1500 m in diameter are largely responsible for the overall growth of the regolith. As a consequence the regolith has to be envisioned as a complex sequence of discrete ejecta blankets. Such blankets constitute first-order discontinuities in the evolving debris layer. The micrometeoroid complex then operates intensely on these fresh ejecta blankets and accomplishes only in an uppermost layer of approximately 1-mm thickness. The absolute flux of micrometeoroids based on lunar rock analyses averaged over the past few 10 to the 6th power years is approximately an order of magnitude lower than presentday satellite fluxes; however, there is indication that the flux increased in the past 10 to the 4th power years to become compatible with the satellite data. Furthermore, there is detailed evidence that the micrometeoroid complex existed throughout geologic time.
    Schlagwort(e): ASTROPHYSICS
    Materialart: The Soviet-Am. Conf. on Cosmochem. of the Moon and Planets, Pt. 2; p 605-635
    Format: application/pdf
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  • 15
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    An ionization gradient across the front in M17 SW (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Measurements of forbidden Ne II lines at 12.8 microns and forbidden S IV at 10.5 microns are presented along a line through and perpendicular to the ionization front in M17 SW. These observations give evidence for ionization stratification within the front, with the most highly ionized material lying toward the east, opposite to the peak molecular emission and far-IR flux. This result supports the picture of M17 SW as a region where a molecular cloud is heated externally. The ionization equilibrium within the ridge and the nebular energetics suggest that the M17 H II region is largely excited by one or more nearby early O stars. The properties of the recently discovered radio point source in M17 are discussed.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 275; 130-134
    Format: text
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  • 16
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    Detection of the J = 6 - 5 transition of carbon monoxide (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The J = 6 - 5 rotational transition of carbon monoxide has been detected in emission from the KL 'plateau source' in the Orion molecular cloud. The corrected peak antenna temperature is 100 K, and the FWHM line width is 26 km/sec. These observations were carried out using the 3 m telescope of the NASA IRTF (Infrared Telescope Facility) on Mauna Kea, Hawaii, and constitute the first astronomical data obtained at submillimeter wavelengths with a heterodyne system using a laser local oscillator. The data support the idea that the high-velocity dispersion CO in Orion is optically thin and set a lower limit to its temperature of approximately 180 K.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 243
    Format: text
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  • 17
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    Observations of outbursts from the recurrent X-ray transient A0538-66 and LMC X-4 (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Nine X-ray outbursts from the LMC have been observed with the HEAO 1 Large-Area Sky Survey Instrument. Some are shown to originate in the recurrent transient A0538-66, confirming the proposed 16 day periodicity and showing that the duration of the events can be as long as 14 days or as short as a few hours. Deviations from precise periodicity can be attributed to phase jitter or to a change in period occurring around the time of an exceptionally long outburst. Other outbursts which are irregular and consistently shorter originate in LMC X-4. A long-term light curve indicates that the LMC X-4 outbursts occur only when the source is in a high state, but are not strongly correlated with the binary phase.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 240
    Format: text
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  • 18
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    An X-ray survey of distant rich clusters of galaxies with HEAO 1 (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The paper presents a 1-10-keV survey of distance class 4, 5, and 6 Abell clusters using the HEAO 1 NRL large area survey experiment. The survey is a little less than 1/30 of the Abell catalog. Eleven clusters are identified with X-ray sources, and X-ray upper limits are provided for 60 others.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 235
    Format: text
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  • 19
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    The infrared spectrum of the carbon star Y Canum Venaticorum between 1.2 and 30 microns (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The paper deals with spectrophotometric observations covering the essentially complete wavelength interval between 1.2 and 30.0 microns. The observations confirm the identification of the C3 band at 5.2 microns. They show that if SiC2 is present, the SiC1 absorption band at 5.7 microns would be obscured by C3 at a 1% spectral resolution. Silicon carbide emission at 11.5 microns exists simultaneously with C3 absorption at 5.2 microns, requiring a contribution of both species to the violet opacity of Y CVn.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 235
    Format: text
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  • 20
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    Laser velocimetry applied to transonic and supersonic aerodynamics (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Measurements obtained with laser velocimetry in a Mach 2.9 separated turbulent boundary layer and in the transonic flow past a two-dimensional airfoil section are presented and compared to data realized by conventional techniques. Agreement in mean velocities was realized where the pressure measurements could be considered reliable; however, in regions of instantaneous reverse velocities, the laser results were found to be consistent with the physics of the flow whereas the pressure data were not. Streamwise turbulence intensities are also presented. In the transonic airfoil study, velocity measurements obtained immediately outside the upper surface boundary layer of a 6-inch chord NACA 64A010 airfoil are compared to edge velocities inferred from surface pressure measurements. For free-stream Mach numbers of 0.6 and 0.8, the agreement in results was very good. "Dual scatter" optical arrangements in conjunction with a single particle, counter-type signal processor were employed in these investigations.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: NASA-TM-X-73117 , A-6510
    Format: application/pdf
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