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  • ASTROPHYSICS  (154)
  • MACHINE ELEMENTS AND PROCESSES
  • Physics
  • 1985-1989  (154)
  • 1970-1974  (98)
  • 1960-1964
  • 1987  (154)
  • 1971  (98)
Collection
Keywords
Publisher
Years
  • 1985-1989  (154)
  • 1970-1974  (98)
  • 1960-1964
Year
  • 1
    Electronic Resource
    Electronic Resource
    Oxidative crosslinking in poly(ethylene terephthalate) at elevated temperaturesPresented at the Southeastern Regional Meeting of the American Chemical Society, Richmond, Virginia, November 5-8, 1969. (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 2063-2070 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Poly(ethylene terephthalate) oxidizes on being heated in air at elevated temperatures to form a crosslinked structure. The crosslinking occurs through a reaction which causes arylation of terephthalate rings to form a biphenyltricarboxylic acid derivative. This reaction is interpreted as a free-radical cleavage generating a substituted phenyl radical which selectively attaches to a terephthalate residue via substitution.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150090722
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Oligomeric silazanes (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 183-192 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: High conversions of oligomeric silazanes that are not volatile at 200°C/0.1 mm are obtained when hexamethylcyclotrisilazane or octamethylcyclotetrasilazane is heated with a molar deficiency of dichlorodimethylsilane at 175°C. The oligomers, which show moderate solvolytic stability, contain disilazane, trisilylamine, and cyclodisilazane units. They are structurally similar to materials that have been prepared by others from hexamethylcyclotrisilazane and ammonium bromide. When the oligomers are treated with ammonia and heated to 325°C, evidence can be found in their spectra for the presence of oligocyclodisilazane structures.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150090117
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  • 3
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    Photometric light curves for seven rapidly-rotating K dwarfs in the Pleiades and Alpha Persei clusters (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Light curves and period estimates were obtained for several Pleiades and Alpha Persei cluster K dwarfs which were identified as rapid rotators in earlier spectroscopic studies. A few of the stars have previously-published light curves, making it possible to study the long-term variability of the light-curve shapes. The general cause of the photometric variability observed for these stars is an asymmetric distribution of photospheric inhomogeneities (starspots). The presence of these inhomogeneities combined with the rotation of the star lead to the light curves observed. The photometric periods derived are thus identified with the rotation period of the star, making it possible to estimate equatorial rotational velocities for these K dwarfs. These data are of particular importance because the clusters are sufficiently young that stars of this mass should have just arrived on the main sequence. These data could be used to estimate the temperatures and sizes of the spot groups necessary to produce the observed light curves for these stars.
    Keywords: ASTROPHYSICS
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 99; 471-481
    Format: text
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  • 4
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    Are the virial masses of clusters smaller than we think? (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The constraints that the available X-ray spectral and imaging data place on the mass distribution and mass to light ratio of rich clusters are considered. It was found for the best determined cases that the mass to light ratio is less than 125 h sub 50 at radii exceeding 1 h sub 50 Mpc. The mass to light ratio is approximately constant at radii exceeding 1 h sub 50 Mpc but may rise to values of roughly 200 h sub 50 in the central regions. The fraction of the total mass that is in baryons, primarily the hot X-ray emitting gas, is roughly 30 percent thus setting the mass to light ratio of the dark material to roughly 70. The model that fits the X-ray data for Coma is in good agreement with the observed optical velocity dispersion vs. radius data.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 317; 593-600
    Format: text
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  • 5
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    Physical processes and infrared emission from the Cassiopeia A supernova remnant (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: IRAS 12-100 micron data on the Cas A remnant are presented, and various physical mechanisms and astrophysical sites that may contribute to the observed infrared emission are analyzed. The contributions of various sources of infrared emission to the IRAS fluxes are found to be small. The residual infrared emission is attributed to thermal emission from dust which is swept up by the expanding supernova blast wave and collisionally heated by the postshock X-ray emitting gas. The calculations are consistent with a shock velocity of 1800 km/s and a preshock gas density of about 2/cu cm. The mass of the swept-up gas is about 0.6 solar mass. An excess of 12 micron thermal emission in the spectrum of Cas A suggests the presence of very small particles in the preshocked gas.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 315; 571-579
    Format: text
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  • 6
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    Bearings, lubricants, and seals for actuators and mechanisms (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Bearings, lubricants, and seals for lubricated and hydraulic components for space shuttle with high temperature and vacuum operating capabilities
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA SPACE SHUTTLE TECHNOL. CONF., VOL. 2 APR. 1971; P 601-632
    Format: text
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  • 7
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    Ground-based infrared observations of comet Halley (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Ground-based 2-23 micron photometry and 10.3 micron imaging of comet Halley taken within hours of the Giotto spacecraft encounter are presented. The photometry shows a color temperature of 360 K and silicate emission features at 10 and 20 microns, and the image shows jet activity similar to that observed by Giotto, but on a scale of thousands of km. The expected 10 micron surface brightness, based on the particle mass distribution measured by Giotto and assuming solid, spherical grains, is a factor of six lower than the observed value. It is suggested that fluffy particles could remove this discrepancy.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 326; 55-57
    Format: text
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  • 8
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    Gamma-ray burster counterparts - Infrared (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The discovery of an IR counterpart to a gamma-ray burster (GRB) would be a big step forward in understanding this enigmatic phenomenon. A program of searching for IR emission from the smallest GRB source regions has been initiated. Seven boxes have been searched with ground-based telescopes at a wavelength of 2.2 microns and 23 with the IRAS data base at wavelengths of 12, 25, 60, and 100 microns. No convincing candidates were identified. The most constraining result are for two error boxes where the K-band magnitude are found to be fainter than 19.03. This observation is compared with the flux predicted from either a companion star or an accretion disk. The new IR observations pose serious difficulties for several GRB models.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 313; 226-230
    Format: text
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  • 9
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    SPAN: Astronomy and astrophysics (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Space Physics Analysis Network (SPAN) is a multi-mission, correlative data comparison network which links science research and data analysis computers in the U.S., Canada, and Europe. The purpose of this document is to provide Astronomy and Astrophysics scientists, currently reachable on SPAN, with basic information and contacts for access to correlative data bases, star catalogs, and other astrophysic facilities accessible over SPAN.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-107940 , NAS 1.15:107940 , NSSDC/WDC-A-R/S-87-06
    Format: application/pdf
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  • 10
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    Design study of shaft face seal with self-acting lift augmentation. 5: Performance in simulated gas turbine engine operation (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The feasibility and the noncontact operation of the self-acting seal was demonstrated over a range of simulated gas turbine engine conditions from 200 to 500 ft/sec sliding speed. Sealed pressure differentials were 50 to 300 psi and sealed temperatures were 150 to 1200 F. Low leakage (about 1/10 that of conventional labyrinth seals) was exhibited in two endurance runs (200 and 338 hr) at 400 ft/sec, 200 psi and 1000 F (gas temperature). For these endurance runs, the self-acting pad wear was less than 3.8 micrometers (0.00015 in.); this low wear was attributed to the noncontact operation of the primary seal. Operating problems identified were fretting wear of the secondary seal and erosion of the primary seal by hard particles.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-6563 , E-6312
    Format: application/pdf
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