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  • ASTROPHYSICS  (14)
  • FABRICATION TECHNOLOGY  (2)
  • Polymer and Materials Science  (1)
  • 1985-1989  (17)
  • 1
    Electronic Resource
    Electronic Resource
    A study of the nature and formation of zinc polyacrylate cement using Fourier transform infrared spectroscopy (1988)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 22 (1988), S. 623-631 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The formation and structure of zinc polyacrylate has been studied by Fourier transform infrared spectroscopy (FTIR). Using this technique we have shown that the fully hardened cement is bonded predominantly by zinc carboxylate complexes, rather than by associations of purely ionic character as had previously been supposed. Ionic bonds are formed in the initial stages of the reaction but are gradually converted to complex forms. This bond rearrangement appears partly responsible for physical changes that occur during gelation, setting, and hardening.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820220704
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    Paper (German National Licenses)
    Fulltext
  • 2
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    4U1722 + 11 - The discovery of an X-ray selected BL Lac object (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Uhuru X-ray source 4U1722 + 11 was observed using the microchannel-plate detector (High Resolution Imager) on the Einstein Observatory, and its coordinates measured to a precision of about 5 arcsec. A 16th-magnitude stellar object within the error circle was observed spectroscopically at CTIO, and at the AAT, and found to have a featureless continuum. Subsequent radio observations at the VLA have established that the object is a radio source at the level of 60 mJy, and optical polarization measurements have determined that the source exhibits variable polarization at the level of 10 percent. On the basis of these observations, it is concluded that 4U1722 + 11 is a member of the class of objects known as X-ray selected blazars of BL Lac objects.
    Keywords: ASTROPHYSICS
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 240; 33-39
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Kinematics and ionization of extended ionized gas in active galaxies. I - The X-ray luminous galaxies NGC 2110, NGC 5506, and MCG -5-23-16 (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Direct CCD imaging and long-slit Vidicon spectroscopy have been used to map the emission-line ratios, profiles, and velocity fields over the extended narrow-line regions in three nearby Seyfert galaxies, NGC 2110, NGC 5506, and MCG -5-23-16. The gas in the letter is spatially unresolved. Similarities between the other two nebulae include the excitation mechanism (photoionization by a central nonthermal source) and the overall profiles of the very broad emission lines close to the nucleus. The nebulae are, however, quite different in their global kinematic behavior. In NGC 2110, the gas appears to lie in a disk or flattened spheroid and to be in ordered rotation, with a classical rotation curve, about an axis parallel to the minor axis of the stellar isophotes. The velocity field of NGC 5506 is quite irregular, but a component of rotation in the plane of the galaxy seems to exist.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 291; 627-654
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    X-ray emission from E and S0 galaxies with compact nuclear radio sources (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The imaging proportional counter on the Einstein Observatory has been used to search for X-ray emission from 13 nearby E and S0 galaxies with compact nuclear radio sources. Five galaxies with X-ray luminosity of about 10 to the 41st ergs/s were detected, and one of them was resolved. These galaxies and a few similar ones observed by others are compared to a sample of radio-quiet E and S0 galaxies. The radio-emitting galaxies have consistently greater X-ray luminosities per unit of optical luminosity than most radio-quiet galaxies. Possible emission mechanisms and models for the resolved source, for the most powerful source, and for the class of E/S0 galaxies with active nuclei are discussed.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 291; 668-676
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Snapring Quick Fastener (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Snapring fastener allows quick attachment and detachment of solar panels. Springy structure bent to fit any recess, making solar-panel removal or repair extremely simple.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-15724 , NASA Tech Briefs (ISSN 0145-319X); 8; 4; P. 569
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Supporting Structures for Flat Solar-Cell Arrays (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Strong supporting structures for flat solar photovoltaic arrays built with such commonly available materials as wood and galvanized steel sheet. Structures resist expected static loads from snow and ice as well as dynamic loads from winds and even Earthquake vibrations. Supporting structure uses inexpensive materials. Parts prefabricated to minimize assembly work in field.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-15600 , NASA Tech Briefs (ISSN 0145-319X); 9; 3; P. 163
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    NASA TECHNICAL REPORTS
  • 7
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    NGC 2110 - A Seyfert and X-ray elliptical galaxy with displaced kinematic and light centers (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Kinematic and imaging observations of NGC 2110 are reported and it is found that the interstellar gas is orbiting with projected rotation axis parallel to the minor axis of the stellar light. The rotation curve is steep close to the center and flat farther out. However, the nucleus is displaced by about 220 pc from the apparent mass center of the galaxy. This last result is discussed in terms of models invoking differential obscuration of stars and gas, non-Keplerian motion of the gas, or a large mass of unseen material which dominates the rotation curve.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 289; 124-128
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    A millimeter-wave survey of CO emission in Seyfert galaxies (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Emission in the 115 GHz 1-0 line of CO has been detected in 18 Seyfert galaxies in a sample of 43. The CO properties of 29 Seyferts in the Revised Shapley Ames Catalog (RSA) are compared with the CO properties of normal galaxies of the same Hubble type. These RSA type 2 Seyferts have an average ratio of CO-to-blue luminosity that is about twice as large as that of the normal galaxies, but the RSA type 1 Seyferts have normal CO luminosities. The RSA type 2 Seyfert galaxies have an unusually large average ratio of CO luminosity-to-H I mass compared to normal disk galaxies. The RSA type 2 Seyferts have an average far-IR luminosity that is about four times larger than a non-Seyfert comparison sample, while the RSA type 1 Seyferts are not significantly more luminous than the non-Seyferts. The result imply that the two classes of Seyferts are intrinsically different from one another and that one class cannot evolve into another in less than a few million years.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 342; 735-758
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    NASA TECHNICAL REPORTS
  • 9
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    Kinematics and ionization of extended gas in active galaxies. V - The Seyfert galaxy NGC 5548 (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: It is found that NGC 5548 contains a spatially extended high-excitation narrow-line region with line widths ranging between 500 and 100 km/s (FWHM). This nebulosity is elongated along the axis of the triple radio source. The peak of optical continuum light (nucleus) coincides with the peak of the forbidden O III 5007 A distribution.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 339; 729-741
    Format: text
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  • 10
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    Star formation and nuclear activity in Seyfert galaxies (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A probable correlation between radio structure and IRAS spectrum in Seyfert galaxies is reported. For Seyfert galaxies known to exhibit the observational characteristics of vigorous star formation, the correlation between 1.4 GHz and 60 micron fluxes is in excellent agreement with that found for other extragalactic star formation regions. The far-IR radiation observed by IRAS from these galaxies is predominantly thermal emission from dust heated by hot stars. On the other hand, Seyfert galaxies with radio emission dominated by 'linear' structures tend to have relatively flat 25-100 micron spectra, and the ratio of their 1.4 GHz to 60 micron flux densities is considerably higher than that for star-forming regions. The radio and far-IR emission from this class appear to be dominated by the Seyfert nucleus, with the far-IR originating directly from a nonthermal source or from dust heated by one.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 206; 1
    Format: text
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