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  • 1
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    Crystallography of rare galactic honeycomb structure near supernova 1987a (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Near supernova 1987a, the rare honeycomb structure of 20-30 galactic bubbles measures 30 x 90 light years. Its remarkable regularity in bubble size suggests a single-event origin which may correlate with the nearby supernova. To test the honeycomb's regularity in shape and size, the formalism of statistical crystallography is developed here for bubble sideness. The standard size-shape relations (Lewis's law, Desch's law, and Aboav-Weaire's law) govern area, perimeter and nearest neighbor shapes. Taken together, they predict a highly non-equilibrium structure for the galactic honeycomb which evolves as a bimodal shape distribution without dominant bubble perimeter energy.
    Keywords: ASTROPHYSICS
    Type: Astrophysics and Space Science (ISSN 0004-640X); 220; 1; p. 65-74
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Adhesion Casting In Low Gravity (1996)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Adhesion casting in low gravity proposed as technique for making new and improved materials. Advantages of low-gravity adhesion casting, in comparison with adhesion casting in normal Earth gravity, comes from better control over, and greater uniformity of, thicknesses of liquid films that form on and adhere to solid surfaces during casting.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-28908 , NASA Tech Briefs (ISSN 0145-319X); 20; 1; P. 78
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    NASA TECHNICAL REPORTS
  • 3
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    Large-Scale Sakharov Condition (1999)
    In:  Other Sources
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    Publication Date: 2019-07-17
    Description: Recent far-reaching theoretical results have used the quantum vacuum noise as a fundamental electromagnetic radiation field to derive a frequency (w) -dependent version of Newton's gravitational coupling term, G(w). This paper reconciles the cutoff frequency with the observed cosmological constant, then briefly puts forward a realizable laboratory test case in the 10-100 Mhz frequency range. One analogy is drawn between the classical vacuum energy experiments with attraction between two closely spaced plates (Casimir cavity) and the arbitrarily dense material boundaries possible in Bose condensates, such as irradiation at Mhz frequencies of superfluid helium or superconductors.
    Keywords: Communications and Radar
    Type: Joint Propulsion; Jun 21, 1999; Los Angeles, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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