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  • 1
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    On the grid generation methods in harmonic mapping on plane and curved surfaces (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Harmonic grid generation methods for multiply connected plane regions and regions on curved surfaces are discussed. In particular, using a general formulation on an analytic Riemannian manifold, it is proved that these mappings are globally one-to-one and onto.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-CR-172331 , ICASE-84-12 , NAS 1.26:172331
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    13C and 1H NMR (Nuclear Magnetic Resonance) studies of solid polyolefines (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The basis of H-1 and C-13 high-resolution NMR investigations of solid polymers is outlined. The C-13 NMR spectra of solid syndiotactic and isotactic polypropene are discussed and their interpretation in terms of conformation and chain-packing effects are reviewed. The effects of decreasing temperature on the C-13 high-resolution spectrum of an annealed sample of isotactic polypropene is described and interpreted in terms of the crystal structure. The question of the proportion of the sample giving rise to C-13 signals is addressed and some results reported. The main cause for observing only part of the total sample is shown to be the H-1 rotating frame spin-lattice relaxation behavior. The H-1 spin-lattice relaxation and spectral characteristics of a number of polyolefin samples are summarized and the role of spin-diffusion discussed.
    Keywords: NONMETALLIC MATERIALS
    Type: AD-P003909 , Trinity Coll. Nucl. Magnetic Resonance of Polymeric Mater.; 32 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A simplified package for calculating with splines (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This package is designed to solve some of the elementary problems of spline interpretation and least squares fit. The subroutines fall into three basic categories. The first category involves computations with a given spline and/or knot sequence; the second category involves routines which calculate the coefficients of splines which perform a certain task (such as interpolation or least squares fit); and the last category is a banded equation solver for specific linear equations.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-CR-141623
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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